diff --git a/ci.sh b/ci.sh
index 46a48f6b..33222298 100755
--- a/ci.sh
+++ b/ci.sh
@@ -1,9 +1,12 @@
 #!/bin/bash
 
-set -euo pipefail
+set -eo pipefail
 
 export RUSTFLAGS=-Dwarnings
 export DEFMT_LOG=trace,embassy_hal_internal=debug,embassy_net_esp_hosted=debug,cyw43=info,cyw43_pio=info,smoltcp=info
+if [[ -z "${CARGO_TARGET_DIR}" ]]; then
+    export CARGO_TARGET_DIR=target_ci
+fi
 
 TARGET=$(rustc -vV | sed -n 's|host: ||p')
 
@@ -36,7 +39,7 @@ cargo batch  \
     --- build --release --manifest-path embassy-time/Cargo.toml --target thumbv6m-none-eabi --features nightly,defmt,defmt-timestamp-uptime,tick-hz-32_768,generic-queue-8 \
     --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,proto-ipv4,medium-ethernet \
     --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,dhcpv4,medium-ethernet \
-    --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,dhcpv4,medium-ethernet,nightly \
+    --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,dhcpv4,medium-ethernet,nightly,dhcpv4-hostname \
     --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,proto-ipv6,medium-ethernet \
     --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,proto-ipv6,medium-ieee802154 \
     --- build --release --manifest-path embassy-net/Cargo.toml --target thumbv7em-none-eabi --features defmt,tcp,udp,dns,proto-ipv6,medium-ethernet,medium-ieee802154 \
diff --git a/embassy-embedded-hal/src/flash/partition/mod.rs b/embassy-embedded-hal/src/flash/partition/mod.rs
index a12e49ce..42c8a308 100644
--- a/embassy-embedded-hal/src/flash/partition/mod.rs
+++ b/embassy-embedded-hal/src/flash/partition/mod.rs
@@ -11,7 +11,7 @@ pub use asynch::Partition;
 pub use blocking::BlockingPartition;
 
 /// Partition error
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error<T> {
     /// The requested flash area is outside the partition
diff --git a/embassy-net/Cargo.toml b/embassy-net/Cargo.toml
index 89582dee..c2fffba8 100644
--- a/embassy-net/Cargo.toml
+++ b/embassy-net/Cargo.toml
@@ -33,6 +33,7 @@ udp = ["smoltcp/socket-udp"]
 tcp = ["smoltcp/socket-tcp"]
 dns = ["smoltcp/socket-dns", "smoltcp/proto-dns"]
 dhcpv4 = ["proto-ipv4", "medium-ethernet", "smoltcp/socket-dhcpv4"]
+dhcpv4-hostname = ["dhcpv4"]
 proto-ipv4 = ["smoltcp/proto-ipv4"]
 proto-ipv6 = ["smoltcp/proto-ipv6"]
 medium-ethernet = ["smoltcp/medium-ethernet"]
diff --git a/embassy-net/src/lib.rs b/embassy-net/src/lib.rs
index 297f0467..ef67935e 100644
--- a/embassy-net/src/lib.rs
+++ b/embassy-net/src/lib.rs
@@ -56,12 +56,22 @@ const LOCAL_PORT_MIN: u16 = 1025;
 const LOCAL_PORT_MAX: u16 = 65535;
 #[cfg(feature = "dns")]
 const MAX_QUERIES: usize = 4;
+#[cfg(feature = "dhcpv4-hostname")]
+const MAX_HOSTNAME_LEN: usize = 32;
 
 /// Memory resources needed for a network stack.
 pub struct StackResources<const SOCK: usize> {
     sockets: [SocketStorage<'static>; SOCK],
     #[cfg(feature = "dns")]
     queries: [Option<dns::DnsQuery>; MAX_QUERIES],
+    #[cfg(feature = "dhcpv4-hostname")]
+    hostname: core::cell::UnsafeCell<HostnameResources>,
+}
+
+#[cfg(feature = "dhcpv4-hostname")]
+struct HostnameResources {
+    option: smoltcp::wire::DhcpOption<'static>,
+    data: [u8; MAX_HOSTNAME_LEN],
 }
 
 impl<const SOCK: usize> StackResources<SOCK> {
@@ -73,6 +83,11 @@ impl<const SOCK: usize> StackResources<SOCK> {
             sockets: [SocketStorage::EMPTY; SOCK],
             #[cfg(feature = "dns")]
             queries: [INIT; MAX_QUERIES],
+            #[cfg(feature = "dhcpv4-hostname")]
+            hostname: core::cell::UnsafeCell::new(HostnameResources {
+                option: smoltcp::wire::DhcpOption { kind: 0, data: &[] },
+                data: [0; MAX_HOSTNAME_LEN],
+            }),
         }
     }
 }
@@ -104,6 +119,7 @@ pub struct StaticConfigV6 {
 /// DHCP configuration.
 #[cfg(feature = "dhcpv4")]
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[non_exhaustive]
 pub struct DhcpConfig {
     /// Maximum lease duration.
     ///
@@ -120,6 +136,9 @@ pub struct DhcpConfig {
     pub server_port: u16,
     /// Client port. This is almost always 68. Do not change unless you know what you're doing.
     pub client_port: u16,
+    /// Our hostname. This will be sent to the DHCP server as Option 12.
+    #[cfg(feature = "dhcpv4-hostname")]
+    pub hostname: Option<heapless::String<MAX_HOSTNAME_LEN>>,
 }
 
 #[cfg(feature = "dhcpv4")]
@@ -131,6 +150,8 @@ impl Default for DhcpConfig {
             ignore_naks: Default::default(),
             server_port: smoltcp::wire::DHCP_SERVER_PORT,
             client_port: smoltcp::wire::DHCP_CLIENT_PORT,
+            #[cfg(feature = "dhcpv4-hostname")]
+            hostname: None,
         }
     }
 }
@@ -232,6 +253,8 @@ struct Inner<D: Driver> {
     dns_socket: SocketHandle,
     #[cfg(feature = "dns")]
     dns_waker: WakerRegistration,
+    #[cfg(feature = "dhcpv4-hostname")]
+    hostname: &'static mut core::cell::UnsafeCell<HostnameResources>,
 }
 
 pub(crate) struct SocketStack {
@@ -307,6 +330,8 @@ impl<D: Driver> Stack<D> {
             )),
             #[cfg(feature = "dns")]
             dns_waker: WakerRegistration::new(),
+            #[cfg(feature = "dhcpv4-hostname")]
+            hostname: &mut resources.hostname,
         };
 
         #[cfg(feature = "proto-ipv4")]
@@ -673,6 +698,25 @@ impl<D: Driver> Inner<D> {
                 socket.set_max_lease_duration(c.max_lease_duration.map(crate::time::duration_to_smoltcp));
                 socket.set_ports(c.server_port, c.client_port);
                 socket.set_retry_config(c.retry_config);
+
+                socket.set_outgoing_options(&[]);
+                #[cfg(feature = "dhcpv4-hostname")]
+                if let Some(h) = c.hostname {
+                    // safety: we just did set_outgoing_options([]) so we know the socket is no longer holding a reference.
+                    let hostname = unsafe { &mut *self.hostname.get() };
+
+                    // create data
+                    // safety: we know the buffer lives forever, new borrows the StackResources for 'static.
+                    // also we won't modify it until next call to this function.
+                    hostname.data[..h.len()].copy_from_slice(h.as_bytes());
+                    let data: &[u8] = &hostname.data[..h.len()];
+                    let data: &'static [u8] = unsafe { core::mem::transmute(data) };
+
+                    // set the option.
+                    hostname.option = smoltcp::wire::DhcpOption { data, kind: 12 };
+                    socket.set_outgoing_options(core::slice::from_ref(&hostname.option));
+                }
+
                 socket.reset();
             }
             _ => {
diff --git a/embassy-rp/src/bootsel.rs b/embassy-rp/src/bootsel.rs
new file mode 100644
index 00000000..540255ae
--- /dev/null
+++ b/embassy-rp/src/bootsel.rs
@@ -0,0 +1,83 @@
+//! Boot Select button
+//!
+//! The RP2040 rom supports a BOOTSEL button that is used to enter the USB bootloader
+//! if held during reset. To avoid wasting GPIO pins, the button is multiplexed onto
+//! the CS pin of the QSPI flash, but that makes it somewhat expensive and complicated
+//! to utilize outside of the rom's bootloader.
+//!
+//! This module provides functionality to poll BOOTSEL from an embassy application.
+
+use crate::flash::in_ram;
+
+impl crate::peripherals::BOOTSEL {
+    /// Polls the BOOTSEL button. Returns true if the button is pressed.
+    ///
+    /// Polling isn't cheap, as this function waits for core 1 to finish it's current
+    /// task and for any DMAs from flash to complete
+    pub fn is_pressed(&mut self) -> bool {
+        let mut cs_status = Default::default();
+
+        unsafe { in_ram(|| cs_status = ram_helpers::read_cs_status()) }.expect("Must be called from Core 0");
+
+        // bootsel is active low, so invert
+        !cs_status.infrompad()
+    }
+}
+
+mod ram_helpers {
+    use rp_pac::io::regs::GpioStatus;
+
+    /// Temporally reconfigures the CS gpio and returns the GpioStatus.
+
+    /// This function runs from RAM so it can disable flash XIP.
+    ///
+    /// # Safety
+    ///
+    /// The caller must ensure flash is idle and will remain idle.
+    /// This function must live in ram. It uses inline asm to avoid any
+    /// potential calls to ABI functions that might be in flash.
+    #[inline(never)]
+    #[link_section = ".data.ram_func"]
+    #[cfg(target_arch = "arm")]
+    pub unsafe fn read_cs_status() -> GpioStatus {
+        let result: u32;
+
+        // Magic value, used as both OEOVER::DISABLE and delay loop counter
+        let magic = 0x2000;
+
+        core::arch::asm!(
+            ".equiv GPIO_STATUS, 0x0",
+            ".equiv GPIO_CTRL,   0x4",
+
+            "ldr {orig_ctrl}, [{cs_gpio}, $GPIO_CTRL]",
+
+            // The BOOTSEL pulls the flash's CS line low though a 1K resistor.
+            // this is weak enough to avoid disrupting normal operation.
+            // But, if we disable CS's output drive and allow it to float...
+            "str {val}, [{cs_gpio}, $GPIO_CTRL]",
+
+            // ...then wait for the state to settle...
+            "1:", // ~4000 cycle delay loop
+            "subs {val}, #8",
+            "bne 1b",
+
+            // ...we can read the current state of bootsel
+            "ldr {val}, [{cs_gpio}, $GPIO_STATUS]",
+
+            // Finally, restore CS to normal operation so XIP can continue
+            "str {orig_ctrl}, [{cs_gpio}, $GPIO_CTRL]",
+
+            cs_gpio = in(reg) rp_pac::IO_QSPI.gpio(1).as_ptr(),
+            orig_ctrl = out(reg) _,
+            val = inout(reg) magic => result,
+            options(nostack),
+        );
+
+        core::mem::transmute(result)
+    }
+
+    #[cfg(not(target_arch = "arm"))]
+    pub unsafe fn read_cs_status() -> GpioStatus {
+        unimplemented!()
+    }
+}
diff --git a/embassy-rp/src/flash.rs b/embassy-rp/src/flash.rs
index 1c1c2449..8fb5542f 100644
--- a/embassy-rp/src/flash.rs
+++ b/embassy-rp/src/flash.rs
@@ -131,7 +131,7 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
 
         let len = to - from;
 
-        unsafe { self.in_ram(|| ram_helpers::flash_range_erase(from, len))? };
+        unsafe { in_ram(|| ram_helpers::flash_range_erase(from, len))? };
 
         Ok(())
     }
@@ -156,7 +156,7 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
 
             let unaligned_offset = offset as usize - start;
 
-            unsafe { self.in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? }
+            unsafe { in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? }
         }
 
         let remaining_len = bytes.len() - start_padding;
@@ -174,12 +174,12 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
             if bytes.as_ptr() as usize >= 0x2000_0000 {
                 let aligned_data = &bytes[start_padding..end_padding];
 
-                unsafe { self.in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, aligned_data))? }
+                unsafe { in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, aligned_data))? }
             } else {
                 for chunk in bytes[start_padding..end_padding].chunks_exact(PAGE_SIZE) {
                     let mut ram_buf = [0xFF_u8; PAGE_SIZE];
                     ram_buf.copy_from_slice(chunk);
-                    unsafe { self.in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, &ram_buf))? }
+                    unsafe { in_ram(|| ram_helpers::flash_range_program(aligned_offset as u32, &ram_buf))? }
                     aligned_offset += PAGE_SIZE;
                 }
             }
@@ -194,47 +194,15 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
 
             let unaligned_offset = end_offset - (PAGE_SIZE - rem_offset);
 
-            unsafe { self.in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? }
+            unsafe { in_ram(|| ram_helpers::flash_range_program(unaligned_offset as u32, &pad_buf))? }
         }
 
         Ok(())
     }
 
-    /// Make sure to uphold the contract points with rp2040-flash.
-    /// - interrupts must be disabled
-    /// - DMA must not access flash memory
-    unsafe fn in_ram(&mut self, operation: impl FnOnce()) -> Result<(), Error> {
-        // Make sure we're running on CORE0
-        let core_id: u32 = pac::SIO.cpuid().read();
-        if core_id != 0 {
-            return Err(Error::InvalidCore);
-        }
-
-        // Make sure CORE1 is paused during the entire duration of the RAM function
-        crate::multicore::pause_core1();
-
-        critical_section::with(|_| {
-            // Wait for all DMA channels in flash to finish before ram operation
-            const SRAM_LOWER: u32 = 0x2000_0000;
-            for n in 0..crate::dma::CHANNEL_COUNT {
-                let ch = crate::pac::DMA.ch(n);
-                while ch.read_addr().read() < SRAM_LOWER && ch.ctrl_trig().read().busy() {}
-            }
-            // Wait for completion of any background reads
-            while pac::XIP_CTRL.stream_ctr().read().0 > 0 {}
-
-            // Run our flash operation in RAM
-            operation();
-        });
-
-        // Resume CORE1 execution
-        crate::multicore::resume_core1();
-        Ok(())
-    }
-
     /// Read SPI flash unique ID
     pub fn blocking_unique_id(&mut self, uid: &mut [u8]) -> Result<(), Error> {
-        unsafe { self.in_ram(|| ram_helpers::flash_unique_id(uid))? };
+        unsafe { in_ram(|| ram_helpers::flash_unique_id(uid))? };
         Ok(())
     }
 
@@ -242,7 +210,7 @@ impl<'d, T: Instance, M: Mode, const FLASH_SIZE: usize> Flash<'d, T, M, FLASH_SI
     pub fn blocking_jedec_id(&mut self) -> Result<u32, Error> {
         let mut jedec = None;
         unsafe {
-            self.in_ram(|| {
+            in_ram(|| {
                 jedec.replace(ram_helpers::flash_jedec_id());
             })?;
         };
@@ -871,6 +839,38 @@ mod ram_helpers {
     }
 }
 
+/// Make sure to uphold the contract points with rp2040-flash.
+/// - interrupts must be disabled
+/// - DMA must not access flash memory
+pub(crate) unsafe fn in_ram(operation: impl FnOnce()) -> Result<(), Error> {
+    // Make sure we're running on CORE0
+    let core_id: u32 = pac::SIO.cpuid().read();
+    if core_id != 0 {
+        return Err(Error::InvalidCore);
+    }
+
+    // Make sure CORE1 is paused during the entire duration of the RAM function
+    crate::multicore::pause_core1();
+
+    critical_section::with(|_| {
+        // Wait for all DMA channels in flash to finish before ram operation
+        const SRAM_LOWER: u32 = 0x2000_0000;
+        for n in 0..crate::dma::CHANNEL_COUNT {
+            let ch = crate::pac::DMA.ch(n);
+            while ch.read_addr().read() < SRAM_LOWER && ch.ctrl_trig().read().busy() {}
+        }
+        // Wait for completion of any background reads
+        while pac::XIP_CTRL.stream_ctr().read().0 > 0 {}
+
+        // Run our flash operation in RAM
+        operation();
+    });
+
+    // Resume CORE1 execution
+    crate::multicore::resume_core1();
+    Ok(())
+}
+
 mod sealed {
     pub trait Instance {}
     pub trait Mode {}
diff --git a/embassy-rp/src/i2c.rs b/embassy-rp/src/i2c.rs
index c358682c..77777ad3 100644
--- a/embassy-rp/src/i2c.rs
+++ b/embassy-rp/src/i2c.rs
@@ -12,7 +12,7 @@ use crate::interrupt::typelevel::{Binding, Interrupt};
 use crate::{interrupt, pac, peripherals, Peripheral};
 
 /// I2C error abort reason
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum AbortReason {
     /// A bus operation was not acknowledged, e.g. due to the addressed device
@@ -27,7 +27,7 @@ pub enum AbortReason {
 }
 
 /// I2C error
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     /// I2C abort with error
diff --git a/embassy-rp/src/i2c_slave.rs b/embassy-rp/src/i2c_slave.rs
index 6136d69c..30e78925 100644
--- a/embassy-rp/src/i2c_slave.rs
+++ b/embassy-rp/src/i2c_slave.rs
@@ -10,7 +10,7 @@ use crate::interrupt::typelevel::{Binding, Interrupt};
 use crate::{pac, Peripheral};
 
 /// I2C error
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[non_exhaustive]
 pub enum Error {
diff --git a/embassy-rp/src/lib.rs b/embassy-rp/src/lib.rs
index e8f818bc..2728395b 100644
--- a/embassy-rp/src/lib.rs
+++ b/embassy-rp/src/lib.rs
@@ -10,6 +10,7 @@ mod critical_section_impl;
 mod intrinsics;
 
 pub mod adc;
+pub mod bootsel;
 pub mod clocks;
 pub mod dma;
 pub mod flash;
@@ -193,6 +194,7 @@ embassy_hal_internal::peripherals! {
     PIO1,
 
     WATCHDOG,
+    BOOTSEL,
 }
 
 macro_rules! select_bootloader {
diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index 20c5155a..70e8f2e2 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -59,12 +59,11 @@ sdio-host = "0.5.0"
 embedded-sdmmc = { git = "https://github.com/embassy-rs/embedded-sdmmc-rs", rev = "a4f293d3a6f72158385f79c98634cb8a14d0d2fc", optional = true }
 critical-section = "1.1"
 atomic-polyfill = "1.0.1"
-stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-a7bf7f02d1e0bc720c24dbb8881677a298890365" }
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-e89b8cfc30e480036aaf502f34c874ee42d68026" }
 vcell = "0.1.3"
 bxcan = "0.7.0"
 nb = "1.0.0"
 stm32-fmc = "0.3.0"
-seq-macro = "0.3.0"
 cfg-if = "1.0.0"
 embedded-io = { version = "0.6.0" }
 embedded-io-async = { version = "0.6.0", optional = true }
@@ -78,7 +77,7 @@ critical-section = { version = "1.1", features = ["std"] }
 [build-dependencies]
 proc-macro2 = "1.0.36"
 quote = "1.0.15"
-stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-a7bf7f02d1e0bc720c24dbb8881677a298890365", default-features = false, features = ["metadata"]}
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-e89b8cfc30e480036aaf502f34c874ee42d68026", default-features = false, features = ["metadata"]}
 
 
 [features]
diff --git a/embassy-stm32/build.rs b/embassy-stm32/build.rs
index 8d6b3703..16a7094f 100644
--- a/embassy-stm32/build.rs
+++ b/embassy-stm32/build.rs
@@ -970,6 +970,105 @@ fn main() {
         }
     }
 
+    // ========
+    // Generate Div/Mul impls for RCC prescalers/dividers/multipliers.
+    let rcc_registers = METADATA
+        .peripherals
+        .iter()
+        .filter_map(|p| p.registers.as_ref())
+        .find(|r| r.kind == "rcc")
+        .unwrap()
+        .ir;
+
+    for e in rcc_registers.enums {
+        fn is_rcc_name(e: &str) -> bool {
+            match e {
+                "Pllp" | "Pllq" | "Pllr" | "Pllm" | "Plln" => true,
+                "Timpre" | "Pllrclkpre" => false,
+                e if e.ends_with("pre") || e.ends_with("div") || e.ends_with("mul") => true,
+                _ => false,
+            }
+        }
+
+        #[derive(Copy, Clone, Debug)]
+        struct Frac {
+            num: u32,
+            denom: u32,
+        }
+
+        impl Frac {
+            fn simplify(self) -> Self {
+                let d = gcd(self.num, self.denom);
+                Self {
+                    num: self.num / d,
+                    denom: self.denom / d,
+                }
+            }
+        }
+
+        fn gcd(a: u32, b: u32) -> u32 {
+            if b == 0 {
+                return a;
+            }
+            gcd(b, a % b)
+        }
+
+        fn parse_num(n: &str) -> Result<Frac, ()> {
+            for prefix in ["DIV", "MUL"] {
+                if let Some(n) = n.strip_prefix(prefix) {
+                    let exponent = n.find('_').map(|e| n.len() - 1 - e).unwrap_or(0) as u32;
+                    let mantissa = n.replace('_', "").parse().map_err(|_| ())?;
+                    let f = Frac {
+                        num: mantissa,
+                        denom: 10u32.pow(exponent),
+                    };
+                    return Ok(f.simplify());
+                }
+            }
+            Err(())
+        }
+
+        if is_rcc_name(e.name) {
+            let enum_name = format_ident!("{}", e.name);
+            let mut muls = Vec::new();
+            let mut divs = Vec::new();
+            for v in e.variants {
+                let Ok(val) = parse_num(v.name) else {
+                    panic!("could not parse mul/div. enum={} variant={}", e.name, v.name)
+                };
+                let variant_name = format_ident!("{}", v.name);
+                let variant = quote!(crate::pac::rcc::vals::#enum_name::#variant_name);
+                let num = val.num;
+                let denom = val.denom;
+                muls.push(quote!(#variant => self * #num / #denom,));
+                divs.push(quote!(#variant => self * #denom / #num,));
+            }
+
+            g.extend(quote! {
+                impl core::ops::Div<crate::pac::rcc::vals::#enum_name> for crate::time::Hertz {
+                    type Output = crate::time::Hertz;
+                    fn div(self, rhs: crate::pac::rcc::vals::#enum_name) -> Self::Output {
+                        match rhs {
+                            #(#divs)*
+                            #[allow(unreachable_patterns)]
+                            _ => unreachable!(),
+                        }
+                    }
+                }
+                impl core::ops::Mul<crate::pac::rcc::vals::#enum_name> for crate::time::Hertz {
+                    type Output = crate::time::Hertz;
+                    fn mul(self, rhs: crate::pac::rcc::vals::#enum_name) -> Self::Output {
+                        match rhs {
+                            #(#muls)*
+                            #[allow(unreachable_patterns)]
+                            _ => unreachable!(),
+                        }
+                    }
+                }
+            });
+        }
+    }
+
     // ========
     // Write foreach_foo! macrotables
 
diff --git a/embassy-stm32/src/dac/mod.rs b/embassy-stm32/src/dac/mod.rs
index 976aa3ee..36f6612b 100644
--- a/embassy-stm32/src/dac/mod.rs
+++ b/embassy-stm32/src/dac/mod.rs
@@ -11,7 +11,7 @@ use crate::{peripherals, Peripheral};
 
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
-/// Curstom Errors
+/// Custom Errors
 pub enum Error {
     UnconfiguredChannel,
     InvalidValue,
diff --git a/embassy-stm32/src/i2c/mod.rs b/embassy-stm32/src/i2c/mod.rs
index b35678ed..62d13e90 100644
--- a/embassy-stm32/src/i2c/mod.rs
+++ b/embassy-stm32/src/i2c/mod.rs
@@ -14,7 +14,7 @@ pub use timeout::*;
 
 use crate::peripherals;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     Bus,
diff --git a/embassy-stm32/src/rcc/bus.rs b/embassy-stm32/src/rcc/bus.rs
deleted file mode 100644
index 495cf7fe..00000000
--- a/embassy-stm32/src/rcc/bus.rs
+++ /dev/null
@@ -1,56 +0,0 @@
-use core::ops::Div;
-
-#[allow(unused_imports)]
-use crate::pac::rcc;
-pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
-use crate::time::Hertz;
-
-impl Div<AHBPrescaler> for Hertz {
-    type Output = Hertz;
-
-    fn div(self, rhs: AHBPrescaler) -> Self::Output {
-        let divisor = match rhs {
-            AHBPrescaler::DIV1 => 1,
-            AHBPrescaler::DIV2 => 2,
-            #[cfg(any(rcc_wb, rcc_wl5, rcc_wle))]
-            AHBPrescaler::DIV3 => 3,
-            AHBPrescaler::DIV4 => 4,
-            #[cfg(any(rcc_wb, rcc_wl5, rcc_wle))]
-            AHBPrescaler::DIV5 => 5,
-            #[cfg(any(rcc_wb, rcc_wl5, rcc_wle))]
-            AHBPrescaler::DIV6 => 6,
-            AHBPrescaler::DIV8 => 8,
-            #[cfg(any(rcc_wb, rcc_wl5, rcc_wle))]
-            AHBPrescaler::DIV10 => 10,
-            AHBPrescaler::DIV16 => 16,
-            #[cfg(any(rcc_wb, rcc_wl5, rcc_wle))]
-            AHBPrescaler::DIV32 => 32,
-            #[cfg(not(rcc_wba))]
-            AHBPrescaler::DIV64 => 64,
-            #[cfg(not(rcc_wba))]
-            AHBPrescaler::DIV128 => 128,
-            #[cfg(not(rcc_wba))]
-            AHBPrescaler::DIV256 => 256,
-            #[cfg(not(rcc_wba))]
-            AHBPrescaler::DIV512 => 512,
-            _ => unreachable!(),
-        };
-        Hertz(self.0 / divisor)
-    }
-}
-
-impl Div<APBPrescaler> for Hertz {
-    type Output = Hertz;
-
-    fn div(self, rhs: APBPrescaler) -> Self::Output {
-        let divisor = match rhs {
-            APBPrescaler::DIV1 => 1,
-            APBPrescaler::DIV2 => 2,
-            APBPrescaler::DIV4 => 4,
-            APBPrescaler::DIV8 => 8,
-            APBPrescaler::DIV16 => 16,
-            _ => unreachable!(),
-        };
-        Hertz(self.0 / divisor)
-    }
-}
diff --git a/embassy-stm32/src/rcc/c0.rs b/embassy-stm32/src/rcc/c0.rs
index 8f45e7c0..efa56de7 100644
--- a/embassy-stm32/src/rcc/c0.rs
+++ b/embassy-stm32/src/rcc/c0.rs
@@ -1,5 +1,5 @@
-pub use super::bus::{AHBPrescaler, APBPrescaler};
 use crate::pac::flash::vals::Latency;
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
 use crate::pac::rcc::vals::{Hsidiv, Ppre, Sw};
 use crate::pac::{FLASH, RCC};
 use crate::rcc::{set_freqs, Clocks};
diff --git a/embassy-stm32/src/rcc/f2.rs b/embassy-stm32/src/rcc/f2.rs
index 44de5bf1..07b816bf 100644
--- a/embassy-stm32/src/rcc/f2.rs
+++ b/embassy-stm32/src/rcc/f2.rs
@@ -1,9 +1,9 @@
-use core::convert::TryFrom;
-use core::ops::{Div, Mul};
-
-pub use super::bus::{AHBPrescaler, APBPrescaler};
 use crate::pac::flash::vals::Latency;
-use crate::pac::rcc::vals::{Pllp, Pllsrc, Sw};
+use crate::pac::rcc::vals::Sw;
+pub use crate::pac::rcc::vals::{
+    Hpre as AHBPrescaler, Pllm as PLLPreDiv, Plln as PLLMul, Pllp as PLLPDiv, Pllq as PLLQDiv, Pllsrc as PLLSrc,
+    Ppre as APBPrescaler,
+};
 use crate::pac::{FLASH, RCC};
 use crate::rcc::bd::BackupDomain;
 use crate::rcc::{set_freqs, Clocks};
@@ -43,17 +43,17 @@ pub enum HSESrc {
 pub struct PLLConfig {
     pub pre_div: PLLPreDiv,
     pub mul: PLLMul,
-    pub main_div: PLLMainDiv,
-    pub pll48_div: PLL48Div,
+    pub p_div: PLLPDiv,
+    pub q_div: PLLQDiv,
 }
 
 impl Default for PLLConfig {
     fn default() -> Self {
         PLLConfig {
-            pre_div: PLLPreDiv(16),
-            mul: PLLMul(192),
-            main_div: PLLMainDiv::Div2,
-            pll48_div: PLL48Div(4),
+            pre_div: PLLPreDiv::DIV16,
+            mul: PLLMul::MUL192,
+            p_div: PLLPDiv::DIV2,
+            q_div: PLLQDiv::DIV4,
         }
     }
 }
@@ -61,9 +61,9 @@ impl Default for PLLConfig {
 impl PLLConfig {
     pub fn clocks(&self, src_freq: Hertz) -> PLLClocks {
         let in_freq = src_freq / self.pre_div;
-        let vco_freq = Hertz((src_freq.0 as u64 * self.mul.0 as u64 / self.pre_div.0 as u64) as u32);
-        let main_freq = vco_freq / self.main_div;
-        let pll48_freq = vco_freq / self.pll48_div;
+        let vco_freq = src_freq / self.pre_div * self.mul;
+        let main_freq = vco_freq / self.p_div;
+        let pll48_freq = vco_freq / self.q_div;
         PLLClocks {
             in_freq,
             vco_freq,
@@ -72,129 +72,6 @@ impl PLLConfig {
         }
     }
 }
-
-/// Clock source for both main PLL and PLLI2S
-#[derive(Clone, Copy, PartialEq)]
-pub enum PLLSrc {
-    HSE,
-    HSI,
-}
-
-impl Into<Pllsrc> for PLLSrc {
-    fn into(self) -> Pllsrc {
-        match self {
-            PLLSrc::HSE => Pllsrc::HSE,
-            PLLSrc::HSI => Pllsrc::HSI,
-        }
-    }
-}
-
-/// Division factor for both main PLL and PLLI2S
-#[derive(Clone, Copy, PartialEq)]
-#[repr(transparent)]
-pub struct PLLPreDiv(u8);
-
-impl TryFrom<u8> for PLLPreDiv {
-    type Error = &'static str;
-
-    fn try_from(value: u8) -> Result<Self, Self::Error> {
-        match value {
-            2..=63 => Ok(PLLPreDiv(value)),
-            _ => Err("PLLPreDiv must be within range 2..=63"),
-        }
-    }
-}
-
-impl Div<PLLPreDiv> for Hertz {
-    type Output = Hertz;
-
-    fn div(self, rhs: PLLPreDiv) -> Self::Output {
-        Hertz(self.0 / u32::from(rhs.0))
-    }
-}
-
-/// Multiplication factor for main PLL
-#[derive(Clone, Copy, PartialEq)]
-#[repr(transparent)]
-pub struct PLLMul(u16);
-
-impl Mul<PLLMul> for Hertz {
-    type Output = Hertz;
-
-    fn mul(self, rhs: PLLMul) -> Self::Output {
-        Hertz(self.0 * u32::from(rhs.0))
-    }
-}
-
-impl TryFrom<u16> for PLLMul {
-    type Error = &'static str;
-
-    fn try_from(value: u16) -> Result<Self, Self::Error> {
-        match value {
-            192..=432 => Ok(PLLMul(value)),
-            _ => Err("PLLMul must be within range 192..=432"),
-        }
-    }
-}
-
-/// PLL division factor for the main system clock
-#[derive(Clone, Copy, PartialEq)]
-pub enum PLLMainDiv {
-    Div2,
-    Div4,
-    Div6,
-    Div8,
-}
-
-impl Into<Pllp> for PLLMainDiv {
-    fn into(self) -> Pllp {
-        match self {
-            PLLMainDiv::Div2 => Pllp::DIV2,
-            PLLMainDiv::Div4 => Pllp::DIV4,
-            PLLMainDiv::Div6 => Pllp::DIV6,
-            PLLMainDiv::Div8 => Pllp::DIV8,
-        }
-    }
-}
-
-impl Div<PLLMainDiv> for Hertz {
-    type Output = Hertz;
-
-    fn div(self, rhs: PLLMainDiv) -> Self::Output {
-        let divisor = match rhs {
-            PLLMainDiv::Div2 => 2,
-            PLLMainDiv::Div4 => 4,
-            PLLMainDiv::Div6 => 6,
-            PLLMainDiv::Div8 => 8,
-        };
-        Hertz(self.0 / divisor)
-    }
-}
-
-/// PLL division factor for USB OTG FS / SDIO / RNG
-#[derive(Clone, Copy, PartialEq)]
-#[repr(transparent)]
-pub struct PLL48Div(u8);
-
-impl Div<PLL48Div> for Hertz {
-    type Output = Hertz;
-
-    fn div(self, rhs: PLL48Div) -> Self::Output {
-        Hertz(self.0 / u32::from(rhs.0))
-    }
-}
-
-impl TryFrom<u8> for PLL48Div {
-    type Error = &'static str;
-
-    fn try_from(value: u8) -> Result<Self, Self::Error> {
-        match value {
-            2..=15 => Ok(PLL48Div(value)),
-            _ => Err("PLL48Div must be within range 2..=15"),
-        }
-    }
-}
-
 #[derive(Clone, Copy, PartialEq)]
 pub struct PLLClocks {
     pub in_freq: Hertz,
@@ -367,11 +244,11 @@ pub(crate) unsafe fn init(config: Config) {
     assert!(pll_clocks.pll48_freq <= Hertz(48_000_000));
 
     RCC.pllcfgr().write(|w| {
-        w.set_pllsrc(config.pll_mux.into());
-        w.set_pllm(config.pll.pre_div.0);
-        w.set_plln(config.pll.mul.0);
-        w.set_pllp(config.pll.main_div.into());
-        w.set_pllq(config.pll.pll48_div.0);
+        w.set_pllsrc(config.pll_mux);
+        w.set_pllm(config.pll.pre_div);
+        w.set_plln(config.pll.mul);
+        w.set_pllp(config.pll.p_div);
+        w.set_pllq(config.pll.q_div);
     });
 
     let (sys_clk, sw) = match config.mux {
diff --git a/embassy-stm32/src/rcc/f4.rs b/embassy-stm32/src/rcc/f4.rs
index ad106ce3..754a0d57 100644
--- a/embassy-stm32/src/rcc/f4.rs
+++ b/embassy-stm32/src/rcc/f4.rs
@@ -1,3 +1,5 @@
+use stm32_metapac::rcc::vals::{Pllm, Plln, Pllq, Pllr};
+
 use crate::pac::rcc::vals::{Hpre, Ppre, Sw};
 use crate::pac::{FLASH, PWR, RCC};
 use crate::rcc::bd::{BackupDomain, RtcClockSource};
@@ -170,12 +172,12 @@ fn setup_pll(
     let real_pll48clk = vco_in * plln / pllq;
 
     RCC.pllcfgr().modify(|w| {
-        w.set_pllm(pllm as u8);
-        w.set_plln(plln as u16);
+        w.set_pllm(Pllm::from_bits(pllm as u8));
+        w.set_plln(Plln::from_bits(plln as u16));
         w.set_pllp(Pllp::from_bits(pllp as u8));
-        w.set_pllq(pllq as u8);
+        w.set_pllq(Pllq::from_bits(pllq as u8));
         w.set_pllsrc(Pllsrc::from_bits(use_hse as u8));
-        w.set_pllr(0);
+        w.set_pllr(Pllr::from_bits(0));
     });
 
     let real_pllsysclk = vco_in * plln / sysclk_div;
diff --git a/embassy-stm32/src/rcc/f7.rs b/embassy-stm32/src/rcc/f7.rs
index f32559e2..565f6aa9 100644
--- a/embassy-stm32/src/rcc/f7.rs
+++ b/embassy-stm32/src/rcc/f7.rs
@@ -1,5 +1,5 @@
 use crate::pac::pwr::vals::Vos;
-use crate::pac::rcc::vals::{Hpre, Ppre, Sw};
+use crate::pac::rcc::vals::{Hpre, Pllm, Plln, Pllp, Pllq, Pllsrc, Ppre, Sw};
 use crate::pac::{FLASH, PWR, RCC};
 use crate::rcc::bd::{BackupDomain, RtcClockSource};
 use crate::rcc::{set_freqs, Clocks};
@@ -29,8 +29,6 @@ pub struct Config {
 }
 
 fn setup_pll(pllsrcclk: u32, use_hse: bool, pllsysclk: Option<u32>, pll48clk: bool) -> PllResults {
-    use crate::pac::rcc::vals::{Pllp, Pllsrc};
-
     let sysclk = pllsysclk.unwrap_or(pllsrcclk);
     if pllsysclk.is_none() && !pll48clk {
         RCC.pllcfgr().modify(|w| w.set_pllsrc(Pllsrc::from_bits(use_hse as u8)));
@@ -84,10 +82,10 @@ fn setup_pll(pllsrcclk: u32, use_hse: bool, pllsysclk: Option<u32>, pll48clk: bo
     let real_pll48clk = vco_in * plln / pllq;
 
     RCC.pllcfgr().modify(|w| {
-        w.set_pllm(pllm as u8);
-        w.set_plln(plln as u16);
+        w.set_pllm(Pllm::from_bits(pllm as u8));
+        w.set_plln(Plln::from_bits(plln as u16));
         w.set_pllp(Pllp::from_bits(pllp as u8));
-        w.set_pllq(pllq as u8);
+        w.set_pllq(Pllq::from_bits(pllq as u8));
         w.set_pllsrc(Pllsrc::from_bits(use_hse as u8));
     });
 
diff --git a/embassy-stm32/src/rcc/g0.rs b/embassy-stm32/src/rcc/g0.rs
index 7f0a2c7f..5ac40911 100644
--- a/embassy-stm32/src/rcc/g0.rs
+++ b/embassy-stm32/src/rcc/g0.rs
@@ -1,6 +1,6 @@
-pub use super::bus::{AHBPrescaler, APBPrescaler};
 use crate::pac::flash::vals::Latency;
-use crate::pac::rcc::vals::{self, Hsidiv, Ppre, Sw};
+use crate::pac::rcc::vals::{self, Hsidiv, Sw};
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Pllm, Plln, Pllp, Pllq, Pllr, Ppre as APBPrescaler};
 use crate::pac::{FLASH, PWR, RCC};
 use crate::rcc::{set_freqs, Clocks};
 use crate::time::Hertz;
@@ -60,15 +60,15 @@ pub struct PllConfig {
     /// The initial divisor of that clock signal
     pub m: Pllm,
     /// The PLL VCO multiplier, which must be in the range `8..=86`.
-    pub n: u8,
+    pub n: Plln,
     /// The final divisor for `PLLRCLK` output which drives the system clock
     pub r: Pllr,
 
     /// The divisor for the `PLLQCLK` output, if desired
-    pub q: Option<Pllr>,
+    pub q: Option<Pllq>,
 
     /// The divisor for the `PLLPCLK` output, if desired
-    pub p: Option<Pllr>,
+    pub p: Option<Pllp>,
 }
 
 impl Default for PllConfig {
@@ -77,9 +77,9 @@ impl Default for PllConfig {
         // HSI16 / 1 * 8 / 2 = 64 MHz
         PllConfig {
             source: PllSrc::HSI16,
-            m: Pllm::Div1,
-            n: 8,
-            r: Pllr::Div2,
+            m: Pllm::DIV1,
+            n: Plln::MUL8,
+            r: Pllr::DIV2,
             q: None,
             p: None,
         }
@@ -92,87 +92,6 @@ pub enum PllSrc {
     HSE(Hertz),
 }
 
-#[derive(Clone, Copy)]
-pub enum Pllm {
-    Div1,
-    Div2,
-    Div3,
-    Div4,
-    Div5,
-    Div6,
-    Div7,
-    Div8,
-}
-
-impl From<Pllm> for u8 {
-    fn from(v: Pllm) -> Self {
-        match v {
-            Pllm::Div1 => 0b000,
-            Pllm::Div2 => 0b001,
-            Pllm::Div3 => 0b010,
-            Pllm::Div4 => 0b011,
-            Pllm::Div5 => 0b100,
-            Pllm::Div6 => 0b101,
-            Pllm::Div7 => 0b110,
-            Pllm::Div8 => 0b111,
-        }
-    }
-}
-
-impl From<Pllm> for u32 {
-    fn from(v: Pllm) -> Self {
-        match v {
-            Pllm::Div1 => 1,
-            Pllm::Div2 => 2,
-            Pllm::Div3 => 3,
-            Pllm::Div4 => 4,
-            Pllm::Div5 => 5,
-            Pllm::Div6 => 6,
-            Pllm::Div7 => 7,
-            Pllm::Div8 => 8,
-        }
-    }
-}
-
-#[derive(Clone, Copy)]
-pub enum Pllr {
-    Div2,
-    Div3,
-    Div4,
-    Div5,
-    Div6,
-    Div7,
-    Div8,
-}
-
-impl From<Pllr> for u8 {
-    fn from(v: Pllr) -> Self {
-        match v {
-            Pllr::Div2 => 0b000,
-            Pllr::Div3 => 0b001,
-            Pllr::Div4 => 0b010,
-            Pllr::Div5 => 0b011,
-            Pllr::Div6 => 0b101,
-            Pllr::Div7 => 0b110,
-            Pllr::Div8 => 0b111,
-        }
-    }
-}
-
-impl From<Pllr> for u32 {
-    fn from(v: Pllr) -> Self {
-        match v {
-            Pllr::Div2 => 2,
-            Pllr::Div3 => 3,
-            Pllr::Div4 => 4,
-            Pllr::Div5 => 5,
-            Pllr::Div6 => 6,
-            Pllr::Div7 => 7,
-            Pllr::Div8 => 8,
-        }
-    }
-}
-
 /// Clocks configutation
 pub struct Config {
     pub mux: ClockSrc,
@@ -194,29 +113,28 @@ impl Default for Config {
 }
 
 impl PllConfig {
-    pub(crate) fn init(self) -> u32 {
-        assert!(self.n >= 8 && self.n <= 86);
+    pub(crate) fn init(self) -> Hertz {
         let (src, input_freq) = match self.source {
-            PllSrc::HSI16 => (vals::Pllsrc::HSI16, HSI_FREQ.0),
-            PllSrc::HSE(freq) => (vals::Pllsrc::HSE, freq.0),
+            PllSrc::HSI16 => (vals::Pllsrc::HSI16, HSI_FREQ),
+            PllSrc::HSE(freq) => (vals::Pllsrc::HSE, freq),
         };
 
-        let m_freq = input_freq / u32::from(self.m);
+        let m_freq = input_freq / self.m;
         // RM0454 § 5.4.4:
         // > Caution: The software must set these bits so that the PLL input frequency after the
         // > /M divider is between 2.66 and 16 MHz.
-        debug_assert!(m_freq >= 2_660_000 && m_freq <= 16_000_000);
+        debug_assert!(m_freq.0 >= 2_660_000 && m_freq.0 <= 16_000_000);
 
         let n_freq = m_freq * self.n as u32;
         // RM0454 § 5.4.4:
         // > Caution: The software must set these bits so that the VCO output frequency is between
         // > 64 and 344 MHz.
-        debug_assert!(n_freq >= 64_000_000 && n_freq <= 344_000_000);
+        debug_assert!(n_freq.0 >= 64_000_000 && n_freq.0 <= 344_000_000);
 
-        let r_freq = n_freq / u32::from(self.r);
+        let r_freq = n_freq / self.r;
         // RM0454 § 5.4.4:
         // > Caution: The software must set this bitfield so as not to exceed 64 MHz on this clock.
-        debug_assert!(r_freq <= 64_000_000);
+        debug_assert!(r_freq.0 <= 64_000_000);
 
         // RM0454 § 5.2.3:
         // > To modify the PLL configuration, proceed as follows:
@@ -239,25 +157,16 @@ impl PllConfig {
             }
         }
 
-        // Configure PLLSYSCFGR
-        RCC.pllsyscfgr().modify(|w| {
-            w.set_pllr(u8::from(self.r));
+        // Configure PLLCFGR
+        RCC.pllcfgr().modify(|w| {
+            w.set_pllr(self.r);
             w.set_pllren(false);
-
-            if let Some(q) = self.q {
-                w.set_pllq(u8::from(q));
-            }
+            w.set_pllq(self.q.unwrap_or(Pllq::DIV2));
             w.set_pllqen(false);
-
-            if let Some(p) = self.p {
-                w.set_pllp(u8::from(p));
-            }
+            w.set_pllp(self.p.unwrap_or(Pllp::DIV2));
             w.set_pllpen(false);
-
             w.set_plln(self.n);
-
-            w.set_pllm(self.m as u8);
-
+            w.set_pllm(self.m);
             w.set_pllsrc(src)
         });
 
@@ -269,7 +178,7 @@ impl PllConfig {
 
         // > 5. Enable the desired PLL outputs by configuring PLLPEN, PLLQEN, and PLLREN in PLL
         // > configuration register (RCC_PLLCFGR).
-        RCC.pllsyscfgr().modify(|w| {
+        RCC.pllcfgr().modify(|w| {
             // We'll use R for system clock, so enable that unconditionally
             w.set_pllren(true);
 
@@ -293,14 +202,14 @@ pub(crate) unsafe fn init(config: Config) {
             });
             while !RCC.cr().read().hsirdy() {}
 
-            (HSI_FREQ.0 >> div.to_bits(), Sw::HSI)
+            (HSI_FREQ / div, Sw::HSI)
         }
         ClockSrc::HSE(freq) => {
             // Enable HSE
             RCC.cr().write(|w| w.set_hseon(true));
             while !RCC.cr().read().hserdy() {}
 
-            (freq.0, Sw::HSE)
+            (freq, Sw::HSE)
         }
         ClockSrc::PLL(pll) => {
             let freq = pll.init();
@@ -310,15 +219,15 @@ pub(crate) unsafe fn init(config: Config) {
             // Enable LSI
             RCC.csr().write(|w| w.set_lsion(true));
             while !RCC.csr().read().lsirdy() {}
-            (LSI_FREQ.0, Sw::LSI)
+            (LSI_FREQ, Sw::LSI)
         }
     };
 
     // Determine the flash latency implied by the target clock speed
     // RM0454 § 3.3.4:
-    let target_flash_latency = if sys_clk <= 24_000_000 {
+    let target_flash_latency = if sys_clk.0 <= 24_000_000 {
         Latency::WS0
-    } else if sys_clk <= 48_000_000 {
+    } else if sys_clk.0 <= 48_000_000 {
         Latency::WS1
     } else {
         Latency::WS2
@@ -374,27 +283,25 @@ pub(crate) unsafe fn init(config: Config) {
         FLASH.acr().modify(|w| w.set_latency(target_flash_latency));
     }
 
-    let ahb_freq = Hertz(sys_clk) / config.ahb_pre;
+    let ahb_freq = sys_clk / config.ahb_pre;
 
     let (apb_freq, apb_tim_freq) = match config.apb_pre {
-        APBPrescaler::DIV1 => (ahb_freq.0, ahb_freq.0),
+        APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: Ppre = pre.into();
-            let pre: u8 = 1 << (pre.to_bits() - 3);
-            let freq = ahb_freq.0 / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     if config.low_power_run {
-        assert!(sys_clk <= 2_000_000);
+        assert!(sys_clk.0 <= 2_000_000);
         PWR.cr1().modify(|w| w.set_lpr(true));
     }
 
     set_freqs(Clocks {
-        sys: Hertz(sys_clk),
+        sys: sys_clk,
         ahb1: ahb_freq,
-        apb1: Hertz(apb_freq),
-        apb1_tim: Hertz(apb_tim_freq),
+        apb1: apb_freq,
+        apb1_tim: apb_tim_freq,
     });
 }
diff --git a/embassy-stm32/src/rcc/g4.rs b/embassy-stm32/src/rcc/g4.rs
index 41bebc91..08ccc5fe 100644
--- a/embassy-stm32/src/rcc/g4.rs
+++ b/embassy-stm32/src/rcc/g4.rs
@@ -2,7 +2,9 @@ use stm32_metapac::flash::vals::Latency;
 use stm32_metapac::rcc::vals::{Adcsel, Pllsrc, Sw};
 use stm32_metapac::FLASH;
 
-pub use super::bus::{AHBPrescaler, APBPrescaler};
+pub use crate::pac::rcc::vals::{
+    Hpre as AHBPrescaler, Pllm as PllM, Plln as PllN, Pllp as PllP, Pllq as PllQ, Pllr as PllR, Ppre as APBPrescaler,
+};
 use crate::pac::{PWR, RCC};
 use crate::rcc::sealed::RccPeripheral;
 use crate::rcc::{set_freqs, Clocks};
@@ -61,181 +63,6 @@ impl Into<Pllsrc> for PllSrc {
     }
 }
 
-seq_macro::seq!(P in 2..=31 {
-    /// Output divider for the PLL P output.
-    #[derive(Clone, Copy)]
-    pub enum PllP {
-        // Note: If PLL P is set to 0 the PLLP bit controls the output division. There does not seem to
-        // a good reason to do this so the API does not support it.
-        // Div1 is invalid
-        #(
-            Div~P,
-        )*
-    }
-
-    impl From<PllP> for u8 {
-        /// Returns the register value for the P output divider.
-        fn from(val: PllP) -> u8 {
-            match val {
-                #(
-                    PllP::Div~P => P,
-                )*
-            }
-        }
-    }
-});
-
-impl PllP {
-    /// Returns the numeric value of the P output divider.
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        val as u32
-    }
-}
-
-/// Output divider for the PLL Q output.
-#[derive(Clone, Copy)]
-pub enum PllQ {
-    Div2,
-    Div4,
-    Div6,
-    Div8,
-}
-
-impl PllQ {
-    /// Returns the numeric value of the Q output divider.
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        (val as u32 + 1) * 2
-    }
-}
-
-impl From<PllQ> for u8 {
-    /// Returns the register value for the Q output divider.
-    fn from(val: PllQ) -> u8 {
-        match val {
-            PllQ::Div2 => 0b00,
-            PllQ::Div4 => 0b01,
-            PllQ::Div6 => 0b10,
-            PllQ::Div8 => 0b11,
-        }
-    }
-}
-
-/// Output divider for the PLL R output.
-#[derive(Clone, Copy)]
-pub enum PllR {
-    Div2,
-    Div4,
-    Div6,
-    Div8,
-}
-
-impl PllR {
-    /// Returns the numeric value of the R output divider.
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        (val as u32 + 1) * 2
-    }
-}
-
-impl From<PllR> for u8 {
-    /// Returns the register value for the R output divider.
-    fn from(val: PllR) -> u8 {
-        match val {
-            PllR::Div2 => 0b00,
-            PllR::Div4 => 0b01,
-            PllR::Div6 => 0b10,
-            PllR::Div8 => 0b11,
-        }
-    }
-}
-
-seq_macro::seq!(N in 8..=127 {
-    /// Multiplication factor for the PLL VCO input clock.
-    #[derive(Clone, Copy)]
-    pub enum PllN {
-        #(
-            Mul~N,
-        )*
-    }
-
-    impl From<PllN> for u8 {
-        /// Returns the register value for the N multiplication factor.
-        fn from(val: PllN) -> u8 {
-            match val {
-                #(
-                    PllN::Mul~N => N,
-                )*
-            }
-        }
-    }
-
-    impl PllN {
-        /// Returns the numeric value of the N multiplication factor.
-        pub fn to_mul(self) -> u32 {
-            match self {
-                #(
-                    PllN::Mul~N => N,
-                )*
-            }
-        }
-    }
-});
-
-/// PLL Pre-division. This must be set such that the PLL input is between 2.66 MHz and 16 MHz.
-#[derive(Copy, Clone)]
-pub enum PllM {
-    Div1,
-    Div2,
-    Div3,
-    Div4,
-    Div5,
-    Div6,
-    Div7,
-    Div8,
-    Div9,
-    Div10,
-    Div11,
-    Div12,
-    Div13,
-    Div14,
-    Div15,
-    Div16,
-}
-
-impl PllM {
-    /// Returns the numeric value of the M pre-division.
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        val as u32 + 1
-    }
-}
-
-impl From<PllM> for u8 {
-    /// Returns the register value for the M pre-division.
-    fn from(val: PllM) -> u8 {
-        match val {
-            PllM::Div1 => 0b0000,
-            PllM::Div2 => 0b0001,
-            PllM::Div3 => 0b0010,
-            PllM::Div4 => 0b0011,
-            PllM::Div5 => 0b0100,
-            PllM::Div6 => 0b0101,
-            PllM::Div7 => 0b0110,
-            PllM::Div8 => 0b0111,
-            PllM::Div9 => 0b1000,
-            PllM::Div10 => 0b1001,
-            PllM::Div11 => 0b1010,
-            PllM::Div12 => 0b1011,
-            PllM::Div13 => 0b1100,
-            PllM::Div14 => 0b1101,
-            PllM::Div15 => 0b1110,
-            PllM::Div16 => 0b1111,
-        }
-    }
-}
-
 /// PLL Configuration
 ///
 /// Use this struct to configure the PLL source, input frequency, multiplication factor, and output
@@ -360,12 +187,12 @@ pub(crate) unsafe fn init(config: Config) {
                 RCC.cr().write(|w| w.set_hsion(true));
                 while !RCC.cr().read().hsirdy() {}
 
-                HSI_FREQ.0
+                HSI_FREQ
             }
             PllSrc::HSE(freq) => {
                 RCC.cr().write(|w| w.set_hseon(true));
                 while !RCC.cr().read().hserdy() {}
-                freq.0
+                freq
             }
         };
 
@@ -373,7 +200,7 @@ pub(crate) unsafe fn init(config: Config) {
         RCC.cr().modify(|w| w.set_pllon(false));
         while RCC.cr().read().pllrdy() {}
 
-        let internal_freq = src_freq / pll_config.prediv_m.to_div() * pll_config.mul_n.to_mul();
+        let internal_freq = src_freq / pll_config.prediv_m * pll_config.mul_n;
 
         RCC.pllcfgr().write(|w| {
             w.set_plln(pll_config.mul_n.into());
@@ -383,26 +210,26 @@ pub(crate) unsafe fn init(config: Config) {
 
         let pll_p_freq = pll_config.div_p.map(|div_p| {
             RCC.pllcfgr().modify(|w| {
-                w.set_pllpdiv(div_p.into());
+                w.set_pllp(div_p);
                 w.set_pllpen(true);
             });
-            Hertz(internal_freq / div_p.to_div())
+            internal_freq / div_p
         });
 
         let pll_q_freq = pll_config.div_q.map(|div_q| {
             RCC.pllcfgr().modify(|w| {
-                w.set_pllq(div_q.into());
+                w.set_pllq(div_q);
                 w.set_pllqen(true);
             });
-            Hertz(internal_freq / div_q.to_div())
+            internal_freq / div_q
         });
 
         let pll_r_freq = pll_config.div_r.map(|div_r| {
             RCC.pllcfgr().modify(|w| {
-                w.set_pllr(div_r.into());
+                w.set_pllr(div_r);
                 w.set_pllren(true);
             });
-            Hertz(internal_freq / div_r.to_div())
+            internal_freq / div_r
         });
 
         // Enable the PLL
diff --git a/embassy-stm32/src/rcc/h.rs b/embassy-stm32/src/rcc/h.rs
index b9c8e7bd..86392dc2 100644
--- a/embassy-stm32/src/rcc/h.rs
+++ b/embassy-stm32/src/rcc/h.rs
@@ -6,8 +6,8 @@ use crate::pac::pwr::vals::Vos;
 pub use crate::pac::rcc::vals::Adcdacsel as AdcClockSource;
 #[cfg(stm32h7)]
 pub use crate::pac::rcc::vals::Adcsel as AdcClockSource;
-pub use crate::pac::rcc::vals::Ckpersel as PerClockSource;
 use crate::pac::rcc::vals::{Ckpersel, Hsidiv, Pllrge, Pllsrc, Pllvcosel, Sw, Timpre};
+pub use crate::pac::rcc::vals::{Ckpersel as PerClockSource, Plldiv as PllDiv, Pllm as PllPreDiv, Plln as PllMul};
 use crate::pac::{FLASH, PWR, RCC};
 #[cfg(stm32h7)]
 use crate::rcc::bd::{BackupDomain, LseCfg, RtcClockSource};
@@ -34,7 +34,7 @@ const VCO_WIDE_RANGE: RangeInclusive<u32> = 192_000_000..=836_000_000;
 #[cfg(any(pwr_h7rm0399, pwr_h7rm0433))]
 const VCO_WIDE_RANGE: RangeInclusive<u32> = 192_000_000..=960_000_000;
 
-pub use super::bus::{AHBPrescaler, APBPrescaler};
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
 
 #[derive(Clone, Copy, Eq, PartialEq)]
 pub enum VoltageScale {
@@ -109,19 +109,19 @@ pub struct Pll {
     #[cfg(stm32h5)]
     pub source: PllSource,
 
-    /// PLL pre-divider (DIVM). Must be between 1 and 63.
-    pub prediv: u8,
+    /// PLL pre-divider (DIVM).
+    pub prediv: PllPreDiv,
 
-    /// PLL multiplication factor. Must be between 4 and 512.
-    pub mul: u16,
+    /// PLL multiplication factor.
+    pub mul: PllMul,
 
-    /// PLL P division factor. If None, PLL P output is disabled. Must be between 1 and 128.
+    /// PLL P division factor. If None, PLL P output is disabled.
     /// On PLL1, it must be even (in particular, it cannot be 1.)
-    pub divp: Option<u16>,
-    /// PLL Q division factor. If None, PLL Q output is disabled. Must be between 1 and 128.
-    pub divq: Option<u16>,
-    /// PLL R division factor. If None, PLL R output is disabled. Must be between 1 and 128.
-    pub divr: Option<u16>,
+    pub divp: Option<PllDiv>,
+    /// PLL Q division factor. If None, PLL Q output is disabled.
+    pub divq: Option<PllDiv>,
+    /// PLL R division factor. If None, PLL R output is disabled.
+    pub divr: Option<PllDiv>,
 }
 
 fn apb_div_tim(apb: &APBPrescaler, clk: Hertz, tim: TimerPrescaler) -> Hertz {
@@ -651,9 +651,9 @@ fn init_pll(num: usize, config: Option<Pll>, input: &PllInput) -> PllOutput {
 
         // "To save power when PLL1 is not used, the value of PLL1M must be set to 0.""
         #[cfg(stm32h7)]
-        RCC.pllckselr().write(|w| w.set_divm(num, 0));
+        RCC.pllckselr().write(|w| w.set_divm(num, PllPreDiv::from_bits(0)));
         #[cfg(stm32h5)]
-        RCC.pllcfgr(num).write(|w| w.set_divm(0));
+        RCC.pllcfgr(num).write(|w| w.set_divm(PllPreDiv::from_bits(0)));
 
         return PllOutput {
             p: None,
@@ -662,9 +662,6 @@ fn init_pll(num: usize, config: Option<Pll>, input: &PllInput) -> PllOutput {
         };
     };
 
-    assert!(1 <= config.prediv && config.prediv <= 63);
-    assert!(4 <= config.mul && config.mul <= 512);
-
     #[cfg(stm32h5)]
     let source = config.source;
     #[cfg(stm32h7)]
@@ -700,22 +697,16 @@ fn init_pll(num: usize, config: Option<Pll>, input: &PllInput) -> PllOutput {
     };
 
     let p = config.divp.map(|div| {
-        assert!(1 <= div && div <= 128);
         if num == 0 {
             // on PLL1, DIVP must be even.
-            assert!(div % 2 == 0);
+            // The enum value is 1 less than the divider, so check it's odd.
+            assert!(div.to_bits() % 2 == 1);
         }
 
         vco_clk / div
     });
-    let q = config.divq.map(|div| {
-        assert!(1 <= div && div <= 128);
-        vco_clk / div
-    });
-    let r = config.divr.map(|div| {
-        assert!(1 <= div && div <= 128);
-        vco_clk / div
-    });
+    let q = config.divq.map(|div| vco_clk / div);
+    let r = config.divr.map(|div| vco_clk / div);
 
     #[cfg(stm32h5)]
     RCC.pllcfgr(num).write(|w| {
@@ -746,10 +737,10 @@ fn init_pll(num: usize, config: Option<Pll>, input: &PllInput) -> PllOutput {
     }
 
     RCC.plldivr(num).write(|w| {
-        w.set_plln(config.mul - 1);
-        w.set_pllp((config.divp.unwrap_or(1) - 1) as u8);
-        w.set_pllq((config.divq.unwrap_or(1) - 1) as u8);
-        w.set_pllr((config.divr.unwrap_or(1) - 1) as u8);
+        w.set_plln(config.mul);
+        w.set_pllp(config.divp.unwrap_or(PllDiv::DIV2));
+        w.set_pllq(config.divq.unwrap_or(PllDiv::DIV2));
+        w.set_pllr(config.divr.unwrap_or(PllDiv::DIV2));
     });
 
     RCC.cr().modify(|w| w.set_pllon(num, true));
diff --git a/embassy-stm32/src/rcc/l0.rs b/embassy-stm32/src/rcc/l0.rs
index 7358be31..b4236126 100644
--- a/embassy-stm32/src/rcc/l0.rs
+++ b/embassy-stm32/src/rcc/l0.rs
@@ -1,8 +1,8 @@
 use super::bd::BackupDomain;
-pub use super::bus::{AHBPrescaler, APBPrescaler};
 use super::RtcClockSource;
 pub use crate::pac::pwr::vals::Vos as VoltageScale;
 use crate::pac::rcc::vals::{Hpre, Msirange, Plldiv, Pllmul, Pllsrc, Ppre, Sw};
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
 #[cfg(crs)]
 use crate::pac::{crs, CRS, SYSCFG};
 use crate::pac::{FLASH, PWR, RCC};
diff --git a/embassy-stm32/src/rcc/l1.rs b/embassy-stm32/src/rcc/l1.rs
index 90524fb3..e445a716 100644
--- a/embassy-stm32/src/rcc/l1.rs
+++ b/embassy-stm32/src/rcc/l1.rs
@@ -1,5 +1,5 @@
-pub use super::bus::{AHBPrescaler, APBPrescaler};
 use crate::pac::rcc::vals::{Hpre, Msirange, Plldiv, Pllmul, Pllsrc, Ppre, Sw};
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
 use crate::pac::{FLASH, RCC};
 use crate::rcc::{set_freqs, Clocks};
 use crate::time::Hertz;
diff --git a/embassy-stm32/src/rcc/l4.rs b/embassy-stm32/src/rcc/l4.rs
index 2fbb9920..0e35b42e 100644
--- a/embassy-stm32/src/rcc/l4.rs
+++ b/embassy-stm32/src/rcc/l4.rs
@@ -1,7 +1,9 @@
-use stm32_metapac::rcc::regs::Cfgr;
-
-pub use super::bus::{AHBPrescaler, APBPrescaler};
-use crate::pac::rcc::vals::{Hpre, Msirange, Pllsrc, Ppre, Sw};
+use crate::pac::rcc::regs::Cfgr;
+pub use crate::pac::rcc::vals::{
+    Hpre as AHBPrescaler, Msirange as MSIRange, Pllm as PllPreDiv, Plln as PllMul, Pllp as PllPDiv, Pllq as PllQDiv,
+    Pllr as PllRDiv, Ppre as APBPrescaler,
+};
+use crate::pac::rcc::vals::{Msirange, Pllsrc, Sw};
 use crate::pac::{FLASH, RCC};
 use crate::rcc::bd::{BackupDomain, RtcClockSource};
 use crate::rcc::{set_freqs, Clocks};
@@ -17,62 +19,11 @@ pub const LSI_FREQ: Hertz = Hertz(32_000);
 #[derive(Clone, Copy)]
 pub enum ClockSrc {
     MSI(MSIRange),
-    PLL(PLLSource, PLLClkDiv, PLLSrcDiv, PLLMul, Option<PLL48Div>),
+    PLL(PLLSource, PllRDiv, PllPreDiv, PllMul, Option<PllQDiv>),
     HSE(Hertz),
     HSI16,
 }
 
-/// MSI Clock Range
-///
-/// These ranges control the frequency of the MSI. Internally, these ranges map
-/// to the `MSIRANGE` bits in the `RCC_ICSCR` register.
-#[derive(Clone, Copy)]
-pub enum MSIRange {
-    /// Around 100 kHz
-    Range0,
-    /// Around 200 kHz
-    Range1,
-    /// Around 400 kHz
-    Range2,
-    /// Around 800 kHz
-    Range3,
-    /// Around 1 MHz
-    Range4,
-    /// Around 2 MHz
-    Range5,
-    /// Around 4 MHz (reset value)
-    Range6,
-    /// Around 8 MHz
-    Range7,
-    /// Around 16 MHz
-    Range8,
-    /// Around 24 MHz
-    Range9,
-    /// Around 32 MHz
-    Range10,
-    /// Around 48 MHz
-    Range11,
-}
-
-impl Default for MSIRange {
-    fn default() -> MSIRange {
-        MSIRange::Range6
-    }
-}
-
-pub type PLL48Div = PLLClkDiv;
-pub type PLLSAI1RDiv = PLLClkDiv;
-pub type PLLSAI1QDiv = PLLClkDiv;
-pub type PLLSAI1PDiv = PLLClkDiv;
-
-/// PLL divider
-#[derive(Clone, Copy)]
-pub enum PLLDiv {
-    Div2,
-    Div3,
-    Div4,
-}
-
 /// PLL clock input source
 #[derive(Clone, Copy)]
 pub enum PLLSource {
@@ -81,95 +32,6 @@ pub enum PLLSource {
     MSI(MSIRange),
 }
 
-seq_macro::seq!(N in 8..=86 {
-    #[derive(Clone, Copy)]
-    pub enum PLLMul {
-        #(
-            Mul~N,
-        )*
-    }
-
-    impl From<PLLMul> for u8 {
-        fn from(val: PLLMul) -> u8 {
-            match val {
-                #(
-                    PLLMul::Mul~N => N,
-                )*
-            }
-        }
-    }
-
-    impl PLLMul {
-        pub fn to_mul(self) -> u32 {
-            match self {
-                #(
-                    PLLMul::Mul~N => N,
-                )*
-            }
-        }
-    }
-});
-
-#[derive(Clone, Copy)]
-pub enum PLLClkDiv {
-    Div2,
-    Div4,
-    Div6,
-    Div8,
-}
-
-impl PLLClkDiv {
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        (val as u32 + 1) * 2
-    }
-}
-
-impl From<PLLClkDiv> for u8 {
-    fn from(val: PLLClkDiv) -> u8 {
-        match val {
-            PLLClkDiv::Div2 => 0b00,
-            PLLClkDiv::Div4 => 0b01,
-            PLLClkDiv::Div6 => 0b10,
-            PLLClkDiv::Div8 => 0b11,
-        }
-    }
-}
-
-#[derive(Clone, Copy)]
-pub enum PLLSrcDiv {
-    Div1,
-    Div2,
-    Div3,
-    Div4,
-    Div5,
-    Div6,
-    Div7,
-    Div8,
-}
-
-impl PLLSrcDiv {
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        val as u32 + 1
-    }
-}
-
-impl From<PLLSrcDiv> for u8 {
-    fn from(val: PLLSrcDiv) -> u8 {
-        match val {
-            PLLSrcDiv::Div1 => 0b000,
-            PLLSrcDiv::Div2 => 0b001,
-            PLLSrcDiv::Div3 => 0b010,
-            PLLSrcDiv::Div4 => 0b011,
-            PLLSrcDiv::Div5 => 0b100,
-            PLLSrcDiv::Div6 => 0b101,
-            PLLSrcDiv::Div7 => 0b110,
-            PLLSrcDiv::Div8 => 0b111,
-        }
-    }
-}
-
 impl From<PLLSource> for Pllsrc {
     fn from(val: PLLSource) -> Pllsrc {
         match val {
@@ -180,57 +42,13 @@ impl From<PLLSource> for Pllsrc {
     }
 }
 
-impl From<MSIRange> for Msirange {
-    fn from(val: MSIRange) -> Msirange {
-        match val {
-            MSIRange::Range0 => Msirange::RANGE100K,
-            MSIRange::Range1 => Msirange::RANGE200K,
-            MSIRange::Range2 => Msirange::RANGE400K,
-            MSIRange::Range3 => Msirange::RANGE800K,
-            MSIRange::Range4 => Msirange::RANGE1M,
-            MSIRange::Range5 => Msirange::RANGE2M,
-            MSIRange::Range6 => Msirange::RANGE4M,
-            MSIRange::Range7 => Msirange::RANGE8M,
-            MSIRange::Range8 => Msirange::RANGE16M,
-            MSIRange::Range9 => Msirange::RANGE24M,
-            MSIRange::Range10 => Msirange::RANGE32M,
-            MSIRange::Range11 => Msirange::RANGE48M,
-        }
-    }
-}
-
-impl From<MSIRange> for u32 {
-    fn from(val: MSIRange) -> u32 {
-        match val {
-            MSIRange::Range0 => 100_000,
-            MSIRange::Range1 => 200_000,
-            MSIRange::Range2 => 400_000,
-            MSIRange::Range3 => 800_000,
-            MSIRange::Range4 => 1_000_000,
-            MSIRange::Range5 => 2_000_000,
-            MSIRange::Range6 => 4_000_000,
-            MSIRange::Range7 => 8_000_000,
-            MSIRange::Range8 => 16_000_000,
-            MSIRange::Range9 => 24_000_000,
-            MSIRange::Range10 => 32_000_000,
-            MSIRange::Range11 => 48_000_000,
-        }
-    }
-}
-
 /// Clocks configutation
 pub struct Config {
     pub mux: ClockSrc,
     pub ahb_pre: AHBPrescaler,
     pub apb1_pre: APBPrescaler,
     pub apb2_pre: APBPrescaler,
-    pub pllsai1: Option<(
-        PLLMul,
-        PLLSrcDiv,
-        Option<PLLSAI1RDiv>,
-        Option<PLLSAI1QDiv>,
-        Option<PLLSAI1PDiv>,
-    )>,
+    pub pllsai1: Option<(PllMul, PllPreDiv, Option<PllRDiv>, Option<PllQDiv>, Option<PllPDiv>)>,
     #[cfg(not(any(stm32l471, stm32l475, stm32l476, stm32l486)))]
     pub hsi48: bool,
     pub rtc_mux: RtcClockSource,
@@ -242,7 +60,7 @@ impl Default for Config {
     #[inline]
     fn default() -> Config {
         Config {
-            mux: ClockSrc::MSI(MSIRange::Range6),
+            mux: ClockSrc::MSI(MSIRange::RANGE4M),
             ahb_pre: AHBPrescaler::DIV1,
             apb1_pre: APBPrescaler::DIV1,
             apb2_pre: APBPrescaler::DIV1,
@@ -262,7 +80,7 @@ pub(crate) unsafe fn init(config: Config) {
         // Turn on MSI and configure it to 4MHz.
         RCC.cr().modify(|w| {
             w.set_msirgsel(true); // MSI Range is provided by MSIRANGE[3:0].
-            w.set_msirange(MSIRange::default().into());
+            w.set_msirange(MSIRange::RANGE4M);
             w.set_msipllen(false);
             w.set_msion(true)
         });
@@ -298,40 +116,40 @@ pub(crate) unsafe fn init(config: Config) {
             while !RCC.cr().read().msirdy() {}
 
             // Enable as clock source for USB, RNG if running at 48 MHz
-            if let MSIRange::Range11 = range {
+            if range == MSIRange::RANGE48M {
                 RCC.ccipr().modify(|w| {
                     w.set_clk48sel(0b11);
                 });
             }
-            (range.into(), Sw::MSI)
+            (msirange_to_hertz(range), Sw::MSI)
         }
         ClockSrc::HSI16 => {
             // Enable HSI16
             RCC.cr().write(|w| w.set_hsion(true));
             while !RCC.cr().read().hsirdy() {}
 
-            (HSI_FREQ.0, Sw::HSI16)
+            (HSI_FREQ, Sw::HSI16)
         }
         ClockSrc::HSE(freq) => {
             // Enable HSE
             RCC.cr().write(|w| w.set_hseon(true));
             while !RCC.cr().read().hserdy() {}
 
-            (freq.0, Sw::HSE)
+            (freq, Sw::HSE)
         }
-        ClockSrc::PLL(src, div, prediv, mul, pll48div) => {
+        ClockSrc::PLL(src, divr, prediv, mul, divq) => {
             let src_freq = match src {
                 PLLSource::HSE(freq) => {
                     // Enable HSE
                     RCC.cr().write(|w| w.set_hseon(true));
                     while !RCC.cr().read().hserdy() {}
-                    freq.0
+                    freq
                 }
                 PLLSource::HSI16 => {
                     // Enable HSI
                     RCC.cr().write(|w| w.set_hsion(true));
                     while !RCC.cr().read().hsirdy() {}
-                    HSI_FREQ.0
+                    HSI_FREQ
                 }
                 PLLSource::MSI(range) => {
                     // Enable MSI
@@ -343,7 +161,8 @@ pub(crate) unsafe fn init(config: Config) {
                         w.set_msion(true);
                     });
                     while !RCC.cr().read().msirdy() {}
-                    range.into()
+
+                    msirange_to_hertz(range)
                 }
             };
 
@@ -351,28 +170,28 @@ pub(crate) unsafe fn init(config: Config) {
             RCC.cr().modify(|w| w.set_pllon(false));
             while RCC.cr().read().pllrdy() {}
 
-            let freq = (src_freq / prediv.to_div() * mul.to_mul()) / div.to_div();
+            let freq = src_freq / prediv * mul / divr;
 
             #[cfg(any(stm32l4px, stm32l4qx, stm32l4rx, stm32l4sx))]
-            assert!(freq <= 120_000_000);
+            assert!(freq.0 <= 120_000_000);
             #[cfg(not(any(stm32l4px, stm32l4qx, stm32l4rx, stm32l4sx)))]
-            assert!(freq <= 80_000_000);
+            assert!(freq.0 <= 80_000_000);
 
             RCC.pllcfgr().write(move |w| {
-                w.set_plln(mul.into());
-                w.set_pllm(prediv.into());
-                w.set_pllr(div.into());
-                if let Some(pll48div) = pll48div {
-                    w.set_pllq(pll48div.into());
+                w.set_plln(mul);
+                w.set_pllm(prediv);
+                w.set_pllr(divr);
+                if let Some(divq) = divq {
+                    w.set_pllq(divq);
                     w.set_pllqen(true);
                 }
                 w.set_pllsrc(src.into());
             });
 
             // Enable as clock source for USB, RNG if PLL48 divisor is provided
-            if let Some(pll48div) = pll48div {
-                let freq = (src_freq / prediv.to_div() * mul.to_mul()) / pll48div.to_div();
-                assert!(freq == 48_000_000);
+            if let Some(divq) = divq {
+                let freq = src_freq / prediv * mul / divq;
+                assert!(freq.0 == 48_000_000);
                 RCC.ccipr().modify(|w| {
                     w.set_clk48sel(0b10);
                 });
@@ -380,25 +199,25 @@ pub(crate) unsafe fn init(config: Config) {
 
             if let Some((mul, prediv, r_div, q_div, p_div)) = config.pllsai1 {
                 RCC.pllsai1cfgr().write(move |w| {
-                    w.set_pllsai1n(mul.into());
-                    w.set_pllsai1m(prediv.into());
+                    w.set_plln(mul);
+                    w.set_pllm(prediv);
                     if let Some(r_div) = r_div {
-                        w.set_pllsai1r(r_div.into());
-                        w.set_pllsai1ren(true);
+                        w.set_pllr(r_div);
+                        w.set_pllren(true);
                     }
                     if let Some(q_div) = q_div {
-                        w.set_pllsai1q(q_div.into());
-                        w.set_pllsai1qen(true);
-                        let freq = (src_freq / prediv.to_div() * mul.to_mul()) / q_div.to_div();
-                        if freq == 48_000_000 {
+                        w.set_pllq(q_div);
+                        w.set_pllqen(true);
+                        let freq = src_freq / prediv * mul / q_div;
+                        if freq.0 == 48_000_000 {
                             RCC.ccipr().modify(|w| {
                                 w.set_clk48sel(0b1);
                             });
                         }
                     }
                     if let Some(p_div) = p_div {
-                        w.set_pllsai1pdiv(p_div.into());
-                        w.set_pllsai1pen(true);
+                        w.set_pllp(p_div);
+                        w.set_pllpen(true);
                     }
                 });
 
@@ -425,17 +244,13 @@ pub(crate) unsafe fn init(config: Config) {
 
     // Set flash wait states
     FLASH.acr().modify(|w| {
-        w.set_latency(if sys_clk <= 16_000_000 {
-            0b000
-        } else if sys_clk <= 32_000_000 {
-            0b001
-        } else if sys_clk <= 48_000_000 {
-            0b010
-        } else if sys_clk <= 64_000_000 {
-            0b011
-        } else {
-            0b100
-        });
+        w.set_latency(match sys_clk.0 {
+            0..=16_000_000 => 0,
+            0..=32_000_000 => 1,
+            0..=48_000_000 => 2,
+            0..=64_000_000 => 3,
+            _ => 4,
+        })
     });
 
     RCC.cfgr().modify(|w| {
@@ -445,43 +260,50 @@ pub(crate) unsafe fn init(config: Config) {
         w.set_ppre2(config.apb2_pre.into());
     });
 
-    let ahb_freq: u32 = match config.ahb_pre {
-        AHBPrescaler::DIV1 => sys_clk,
-        pre => {
-            let pre: Hpre = pre.into();
-            let pre = 1 << (pre.to_bits() as u32 - 7);
-            sys_clk / pre
-        }
-    };
+    let ahb_freq = sys_clk / config.ahb_pre;
 
     let (apb1_freq, apb1_tim_freq) = match config.apb1_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: Ppre = pre.into();
-            let pre: u8 = 1 << (pre.to_bits() - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     let (apb2_freq, apb2_tim_freq) = match config.apb2_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: Ppre = pre.into();
-            let pre: u8 = 1 << (pre.to_bits() - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     set_freqs(Clocks {
-        sys: Hertz(sys_clk),
-        ahb1: Hertz(ahb_freq),
-        ahb2: Hertz(ahb_freq),
-        ahb3: Hertz(ahb_freq),
-        apb1: Hertz(apb1_freq),
-        apb2: Hertz(apb2_freq),
-        apb1_tim: Hertz(apb1_tim_freq),
-        apb2_tim: Hertz(apb2_tim_freq),
+        sys: sys_clk,
+        ahb1: ahb_freq,
+        ahb2: ahb_freq,
+        ahb3: ahb_freq,
+        apb1: apb1_freq,
+        apb2: apb2_freq,
+        apb1_tim: apb1_tim_freq,
+        apb2_tim: apb2_tim_freq,
     });
 }
+
+fn msirange_to_hertz(range: Msirange) -> Hertz {
+    match range {
+        MSIRange::RANGE100K => Hertz(100_000),
+        MSIRange::RANGE200K => Hertz(200_000),
+        MSIRange::RANGE400K => Hertz(400_000),
+        MSIRange::RANGE800K => Hertz(800_000),
+        MSIRange::RANGE1M => Hertz(1_000_000),
+        MSIRange::RANGE2M => Hertz(2_000_000),
+        MSIRange::RANGE4M => Hertz(4_000_000),
+        MSIRange::RANGE8M => Hertz(8_000_000),
+        MSIRange::RANGE16M => Hertz(16_000_000),
+        MSIRange::RANGE24M => Hertz(24_000_000),
+        MSIRange::RANGE32M => Hertz(32_000_000),
+        MSIRange::RANGE48M => Hertz(48_000_000),
+        _ => unreachable!(),
+    }
+}
diff --git a/embassy-stm32/src/rcc/l5.rs b/embassy-stm32/src/rcc/l5.rs
index 652bdcb7..d9b3ee28 100644
--- a/embassy-stm32/src/rcc/l5.rs
+++ b/embassy-stm32/src/rcc/l5.rs
@@ -1,8 +1,11 @@
-use stm32_metapac::PWR;
-
-pub use super::bus::{AHBPrescaler, APBPrescaler};
-use crate::pac::rcc::vals::{Hpre, Msirange, Pllsrc, Ppre, Sw};
-use crate::pac::{FLASH, RCC};
+use crate::pac::rcc::regs::Cfgr;
+pub use crate::pac::rcc::vals::{
+    Hpre as AHBPrescaler, Msirange as MSIRange, Pllm as PllPreDiv, Plln as PllMul, Pllp as PllPDiv, Pllq as PllQDiv,
+    Pllr as PllRDiv, Ppre as APBPrescaler,
+};
+use crate::pac::rcc::vals::{Msirange, Pllsrc, Sw};
+use crate::pac::{FLASH, PWR, RCC};
+use crate::rcc::bd::RtcClockSource;
 use crate::rcc::{set_freqs, Clocks};
 use crate::time::Hertz;
 
@@ -16,62 +19,11 @@ pub const LSI_FREQ: Hertz = Hertz(32_000);
 #[derive(Clone, Copy)]
 pub enum ClockSrc {
     MSI(MSIRange),
-    PLL(PLLSource, PLLClkDiv, PLLSrcDiv, PLLMul, Option<PLL48Div>),
+    PLL(PLLSource, PllRDiv, PllPreDiv, PllMul, Option<PllQDiv>),
     HSE(Hertz),
     HSI16,
 }
 
-/// MSI Clock Range
-///
-/// These ranges control the frequency of the MSI. Internally, these ranges map
-/// to the `MSIRANGE` bits in the `RCC_ICSCR` register.
-#[derive(Clone, Copy)]
-pub enum MSIRange {
-    /// Around 100 kHz
-    Range0,
-    /// Around 200 kHz
-    Range1,
-    /// Around 400 kHz
-    Range2,
-    /// Around 800 kHz
-    Range3,
-    /// Around 1 MHz
-    Range4,
-    /// Around 2 MHz
-    Range5,
-    /// Around 4 MHz (reset value)
-    Range6,
-    /// Around 8 MHz
-    Range7,
-    /// Around 16 MHz
-    Range8,
-    /// Around 24 MHz
-    Range9,
-    /// Around 32 MHz
-    Range10,
-    /// Around 48 MHz
-    Range11,
-}
-
-impl Default for MSIRange {
-    fn default() -> MSIRange {
-        MSIRange::Range6
-    }
-}
-
-pub type PLL48Div = PLLClkDiv;
-pub type PLLSAI1RDiv = PLLClkDiv;
-pub type PLLSAI1QDiv = PLLClkDiv;
-pub type PLLSAI1PDiv = PLLClkDiv;
-
-/// PLL divider
-#[derive(Clone, Copy)]
-pub enum PLLDiv {
-    Div2,
-    Div3,
-    Div4,
-}
-
 /// PLL clock input source
 #[derive(Clone, Copy)]
 pub enum PLLSource {
@@ -80,95 +32,6 @@ pub enum PLLSource {
     MSI(MSIRange),
 }
 
-seq_macro::seq!(N in 8..=86 {
-    #[derive(Clone, Copy)]
-    pub enum PLLMul {
-        #(
-            Mul~N,
-        )*
-    }
-
-    impl From<PLLMul> for u8 {
-        fn from(val: PLLMul) -> u8 {
-            match val {
-                #(
-                    PLLMul::Mul~N => N,
-                )*
-            }
-        }
-    }
-
-    impl PLLMul {
-        pub fn to_mul(self) -> u32 {
-            match self {
-                #(
-                    PLLMul::Mul~N => N,
-                )*
-            }
-        }
-    }
-});
-
-#[derive(Clone, Copy)]
-pub enum PLLClkDiv {
-    Div2,
-    Div4,
-    Div6,
-    Div8,
-}
-
-impl PLLClkDiv {
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        (val as u32 + 1) * 2
-    }
-}
-
-impl From<PLLClkDiv> for u8 {
-    fn from(val: PLLClkDiv) -> u8 {
-        match val {
-            PLLClkDiv::Div2 => 0b00,
-            PLLClkDiv::Div4 => 0b01,
-            PLLClkDiv::Div6 => 0b10,
-            PLLClkDiv::Div8 => 0b11,
-        }
-    }
-}
-
-#[derive(Clone, Copy)]
-pub enum PLLSrcDiv {
-    Div1,
-    Div2,
-    Div3,
-    Div4,
-    Div5,
-    Div6,
-    Div7,
-    Div8,
-}
-
-impl PLLSrcDiv {
-    pub fn to_div(self) -> u32 {
-        let val: u8 = self.into();
-        val as u32 + 1
-    }
-}
-
-impl From<PLLSrcDiv> for u8 {
-    fn from(val: PLLSrcDiv) -> u8 {
-        match val {
-            PLLSrcDiv::Div1 => 0b000,
-            PLLSrcDiv::Div2 => 0b001,
-            PLLSrcDiv::Div3 => 0b010,
-            PLLSrcDiv::Div4 => 0b011,
-            PLLSrcDiv::Div5 => 0b100,
-            PLLSrcDiv::Div6 => 0b101,
-            PLLSrcDiv::Div7 => 0b110,
-            PLLSrcDiv::Div8 => 0b111,
-        }
-    }
-}
-
 impl From<PLLSource> for Pllsrc {
     fn from(val: PLLSource) -> Pllsrc {
         match val {
@@ -179,75 +42,59 @@ impl From<PLLSource> for Pllsrc {
     }
 }
 
-impl From<MSIRange> for Msirange {
-    fn from(val: MSIRange) -> Msirange {
-        match val {
-            MSIRange::Range0 => Msirange::RANGE100K,
-            MSIRange::Range1 => Msirange::RANGE200K,
-            MSIRange::Range2 => Msirange::RANGE400K,
-            MSIRange::Range3 => Msirange::RANGE800K,
-            MSIRange::Range4 => Msirange::RANGE1M,
-            MSIRange::Range5 => Msirange::RANGE2M,
-            MSIRange::Range6 => Msirange::RANGE4M,
-            MSIRange::Range7 => Msirange::RANGE8M,
-            MSIRange::Range8 => Msirange::RANGE16M,
-            MSIRange::Range9 => Msirange::RANGE24M,
-            MSIRange::Range10 => Msirange::RANGE32M,
-            MSIRange::Range11 => Msirange::RANGE48M,
-        }
-    }
-}
-
-impl From<MSIRange> for u32 {
-    fn from(val: MSIRange) -> u32 {
-        match val {
-            MSIRange::Range0 => 100_000,
-            MSIRange::Range1 => 200_000,
-            MSIRange::Range2 => 400_000,
-            MSIRange::Range3 => 800_000,
-            MSIRange::Range4 => 1_000_000,
-            MSIRange::Range5 => 2_000_000,
-            MSIRange::Range6 => 4_000_000,
-            MSIRange::Range7 => 8_000_000,
-            MSIRange::Range8 => 16_000_000,
-            MSIRange::Range9 => 24_000_000,
-            MSIRange::Range10 => 32_000_000,
-            MSIRange::Range11 => 48_000_000,
-        }
-    }
-}
-
 /// Clocks configutation
 pub struct Config {
     pub mux: ClockSrc,
     pub ahb_pre: AHBPrescaler,
     pub apb1_pre: APBPrescaler,
     pub apb2_pre: APBPrescaler,
-    pub pllsai1: Option<(
-        PLLMul,
-        PLLSrcDiv,
-        Option<PLLSAI1RDiv>,
-        Option<PLLSAI1QDiv>,
-        Option<PLLSAI1PDiv>,
-    )>,
+    pub pllsai1: Option<(PllMul, PllPreDiv, Option<PllRDiv>, Option<PllQDiv>, Option<PllPDiv>)>,
     pub hsi48: bool,
+    pub rtc_mux: RtcClockSource,
+    pub lse: Option<Hertz>,
+    pub lsi: bool,
 }
 
 impl Default for Config {
     #[inline]
     fn default() -> Config {
         Config {
-            mux: ClockSrc::MSI(MSIRange::Range6),
+            mux: ClockSrc::MSI(MSIRange::RANGE4M),
             ahb_pre: AHBPrescaler::DIV1,
             apb1_pre: APBPrescaler::DIV1,
             apb2_pre: APBPrescaler::DIV1,
             pllsai1: None,
             hsi48: false,
+            rtc_mux: RtcClockSource::LSI,
+            lsi: true,
+            lse: None,
         }
     }
 }
 
 pub(crate) unsafe fn init(config: Config) {
+    // Switch to MSI to prevent problems with PLL configuration.
+    if !RCC.cr().read().msion() {
+        // Turn on MSI and configure it to 4MHz.
+        RCC.cr().modify(|w| {
+            w.set_msirgsel(true); // MSI Range is provided by MSIRANGE[3:0].
+            w.set_msirange(MSIRange::RANGE4M);
+            w.set_msipllen(false);
+            w.set_msion(true)
+        });
+
+        // Wait until MSI is running
+        while !RCC.cr().read().msirdy() {}
+    }
+    if RCC.cfgr().read().sws() != Sw::MSI {
+        // Set MSI as a clock source, reset prescalers.
+        RCC.cfgr().write_value(Cfgr::default());
+        // Wait for clock switch status bits to change.
+        while RCC.cfgr().read().sws() != Sw::MSI {}
+    }
+
+    //BackupDomain::configure_ls(config.rtc_mux, config.lsi, config.lse.map(|_| Default::default()));
+
     PWR.cr1().modify(|w| w.set_vos(stm32_metapac::pwr::vals::Vos::RANGE0));
     let (sys_clk, sw) = match config.mux {
         ClockSrc::MSI(range) => {
@@ -255,47 +102,53 @@ pub(crate) unsafe fn init(config: Config) {
             RCC.cr().write(|w| {
                 let bits: Msirange = range.into();
                 w.set_msirange(bits);
-                w.set_msipllen(false);
                 w.set_msirgsel(true);
                 w.set_msion(true);
+
+                if config.rtc_mux == RtcClockSource::LSE {
+                    // If LSE is enabled, enable calibration of MSI
+                    w.set_msipllen(true);
+                } else {
+                    w.set_msipllen(false);
+                }
             });
             while !RCC.cr().read().msirdy() {}
 
             // Enable as clock source for USB, RNG if running at 48 MHz
-            if let MSIRange::Range11 = range {
+            if range == MSIRange::RANGE48M {
                 RCC.ccipr1().modify(|w| {
                     w.set_clk48msel(0b11);
                 });
             }
-            (range.into(), Sw::MSI)
+            (msirange_to_hertz(range), Sw::MSI)
         }
         ClockSrc::HSI16 => {
             // Enable HSI16
             RCC.cr().write(|w| w.set_hsion(true));
             while !RCC.cr().read().hsirdy() {}
 
-            (HSI_FREQ.0, Sw::HSI16)
+            (HSI_FREQ, Sw::HSI16)
         }
         ClockSrc::HSE(freq) => {
             // Enable HSE
             RCC.cr().write(|w| w.set_hseon(true));
             while !RCC.cr().read().hserdy() {}
 
-            (freq.0, Sw::HSE)
+            (freq, Sw::HSE)
         }
-        ClockSrc::PLL(src, div, prediv, mul, pll48div) => {
+        ClockSrc::PLL(src, divr, prediv, mul, divq) => {
             let src_freq = match src {
                 PLLSource::HSE(freq) => {
                     // Enable HSE
                     RCC.cr().write(|w| w.set_hseon(true));
                     while !RCC.cr().read().hserdy() {}
-                    freq.0
+                    freq
                 }
                 PLLSource::HSI16 => {
                     // Enable HSI
                     RCC.cr().write(|w| w.set_hsion(true));
                     while !RCC.cr().read().hsirdy() {}
-                    HSI_FREQ.0
+                    HSI_FREQ
                 }
                 PLLSource::MSI(range) => {
                     // Enable MSI
@@ -307,7 +160,8 @@ pub(crate) unsafe fn init(config: Config) {
                         w.set_msion(true);
                     });
                     while !RCC.cr().read().msirdy() {}
-                    range.into()
+
+                    msirange_to_hertz(range)
                 }
             };
 
@@ -315,23 +169,23 @@ pub(crate) unsafe fn init(config: Config) {
             RCC.cr().modify(|w| w.set_pllon(false));
             while RCC.cr().read().pllrdy() {}
 
-            let freq = (src_freq / prediv.to_div() * mul.to_mul()) / div.to_div();
+            let freq = src_freq / prediv * mul / divr;
 
             RCC.pllcfgr().write(move |w| {
-                w.set_plln(mul.into());
-                w.set_pllm(prediv.into());
-                w.set_pllr(div.into());
-                if let Some(pll48div) = pll48div {
-                    w.set_pllq(pll48div.into());
+                w.set_plln(mul);
+                w.set_pllm(prediv);
+                w.set_pllr(divr);
+                if let Some(divq) = divq {
+                    w.set_pllq(divq);
                     w.set_pllqen(true);
                 }
                 w.set_pllsrc(src.into());
             });
 
             // Enable as clock source for USB, RNG if PLL48 divisor is provided
-            if let Some(pll48div) = pll48div {
-                let freq = (src_freq / prediv.to_div() * mul.to_mul()) / pll48div.to_div();
-                assert!(freq == 48_000_000);
+            if let Some(divq) = divq {
+                let freq = src_freq / prediv * mul / divq;
+                assert!(freq.0 == 48_000_000);
                 RCC.ccipr1().modify(|w| {
                     w.set_clk48msel(0b10);
                 });
@@ -339,25 +193,25 @@ pub(crate) unsafe fn init(config: Config) {
 
             if let Some((mul, prediv, r_div, q_div, p_div)) = config.pllsai1 {
                 RCC.pllsai1cfgr().write(move |w| {
-                    w.set_pllsai1n(mul.into());
-                    w.set_pllsai1m(prediv.into());
+                    w.set_plln(mul);
+                    w.set_pllm(prediv);
                     if let Some(r_div) = r_div {
-                        w.set_pllsai1r(r_div.into());
-                        w.set_pllsai1ren(true);
+                        w.set_pllr(r_div);
+                        w.set_pllren(true);
                     }
                     if let Some(q_div) = q_div {
-                        w.set_pllsai1q(q_div.into());
-                        w.set_pllsai1qen(true);
-                        let freq = (src_freq / prediv.to_div() * mul.to_mul()) / q_div.to_div();
-                        if freq == 48_000_000 {
+                        w.set_pllq(q_div);
+                        w.set_pllqen(true);
+                        let freq = src_freq / prediv * mul / q_div;
+                        if freq.0 == 48_000_000 {
                             RCC.ccipr1().modify(|w| {
                                 w.set_clk48msel(0b1);
                             });
                         }
                     }
                     if let Some(p_div) = p_div {
-                        w.set_pllsai1pdiv(p_div.into());
-                        w.set_pllsai1pen(true);
+                        w.set_pllp(p_div);
+                        w.set_pllpen(true);
                     }
                 });
 
@@ -384,7 +238,7 @@ pub(crate) unsafe fn init(config: Config) {
     // Set flash wait states
     // VCORE Range 0 (performance), others TODO
     FLASH.acr().modify(|w| {
-        w.set_latency(match sys_clk {
+        w.set_latency(match sys_clk.0 {
             0..=20_000_000 => 0,
             0..=40_000_000 => 1,
             0..=60_000_000 => 2,
@@ -401,43 +255,50 @@ pub(crate) unsafe fn init(config: Config) {
         w.set_ppre2(config.apb2_pre.into());
     });
 
-    let ahb_freq: u32 = match config.ahb_pre {
-        AHBPrescaler::DIV1 => sys_clk,
-        pre => {
-            let pre: Hpre = pre.into();
-            let pre = 1 << (pre.to_bits() as u32 - 7);
-            sys_clk / pre
-        }
-    };
+    let ahb_freq = sys_clk / config.ahb_pre;
 
     let (apb1_freq, apb1_tim_freq) = match config.apb1_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: Ppre = pre.into();
-            let pre: u8 = 1 << (pre.to_bits() - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     let (apb2_freq, apb2_tim_freq) = match config.apb2_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: Ppre = pre.into();
-            let pre: u8 = 1 << (pre.to_bits() - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     set_freqs(Clocks {
-        sys: Hertz(sys_clk),
-        ahb1: Hertz(ahb_freq),
-        ahb2: Hertz(ahb_freq),
-        ahb3: Hertz(ahb_freq),
-        apb1: Hertz(apb1_freq),
-        apb2: Hertz(apb2_freq),
-        apb1_tim: Hertz(apb1_tim_freq),
-        apb2_tim: Hertz(apb2_tim_freq),
+        sys: sys_clk,
+        ahb1: ahb_freq,
+        ahb2: ahb_freq,
+        ahb3: ahb_freq,
+        apb1: apb1_freq,
+        apb2: apb2_freq,
+        apb1_tim: apb1_tim_freq,
+        apb2_tim: apb2_tim_freq,
     });
 }
+
+fn msirange_to_hertz(range: Msirange) -> Hertz {
+    match range {
+        MSIRange::RANGE100K => Hertz(100_000),
+        MSIRange::RANGE200K => Hertz(200_000),
+        MSIRange::RANGE400K => Hertz(400_000),
+        MSIRange::RANGE800K => Hertz(800_000),
+        MSIRange::RANGE1M => Hertz(1_000_000),
+        MSIRange::RANGE2M => Hertz(2_000_000),
+        MSIRange::RANGE4M => Hertz(4_000_000),
+        MSIRange::RANGE8M => Hertz(8_000_000),
+        MSIRange::RANGE16M => Hertz(16_000_000),
+        MSIRange::RANGE24M => Hertz(24_000_000),
+        MSIRange::RANGE32M => Hertz(32_000_000),
+        MSIRange::RANGE48M => Hertz(48_000_000),
+        _ => unreachable!(),
+    }
+}
diff --git a/embassy-stm32/src/rcc/mod.rs b/embassy-stm32/src/rcc/mod.rs
index 0d2d672f..abd8402c 100644
--- a/embassy-stm32/src/rcc/mod.rs
+++ b/embassy-stm32/src/rcc/mod.rs
@@ -6,7 +6,6 @@ pub use crate::rcc::bd::RtcClockSource;
 use crate::time::Hertz;
 
 pub(crate) mod bd;
-mod bus;
 mod mco;
 pub use mco::*;
 
diff --git a/embassy-stm32/src/rcc/u5.rs b/embassy-stm32/src/rcc/u5.rs
index d9a53128..d8fb1730 100644
--- a/embassy-stm32/src/rcc/u5.rs
+++ b/embassy-stm32/src/rcc/u5.rs
@@ -1,7 +1,6 @@
-use stm32_metapac::rcc::vals::{Msirange, Msirgsel, Pllm, Pllsrc, Sw};
-
-pub use super::bus::{AHBPrescaler, APBPrescaler};
-use crate::pac::{FLASH, RCC};
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Msirange, Plldiv, Pllm, Plln, Ppre as APBPrescaler};
+use crate::pac::rcc::vals::{Msirgsel, Pllmboost, Pllrge, Pllsrc, Sw};
+use crate::pac::{FLASH, PWR, RCC};
 use crate::rcc::{set_freqs, Clocks};
 use crate::time::Hertz;
 
@@ -15,110 +14,92 @@ pub use crate::pac::pwr::vals::Vos as VoltageScale;
 
 #[derive(Copy, Clone)]
 pub enum ClockSrc {
-    MSI(MSIRange),
+    /// Use an internal medium speed oscillator (MSIS) as the system clock.
+    MSI(Msirange),
+    /// Use the external high speed clock as the system clock.
+    ///
+    /// HSE clocks faster than 25 MHz require at least `VoltageScale::RANGE3`, and HSE clocks must
+    /// never exceed 50 MHz.
     HSE(Hertz),
+    /// Use the 16 MHz internal high speed oscillator as the system clock.
     HSI16,
-    PLL1R(PllSrc, PllM, PllN, PllClkDiv),
+    /// Use PLL1 as the system clock.
+    PLL1R(PllConfig),
 }
 
-#[derive(Clone, Copy, Debug)]
+impl Default for ClockSrc {
+    fn default() -> Self {
+        // The default system clock source is MSIS @ 4 MHz, per RM0456 § 11.4.9
+        ClockSrc::MSI(Msirange::RANGE_4MHZ)
+    }
+}
+
+#[derive(Clone, Copy)]
+pub struct PllConfig {
+    /// The clock source for the PLL.
+    pub source: PllSrc,
+    /// The PLL prescaler.
+    ///
+    /// The clock speed of the `source` divided by `m` must be between 4 and 16 MHz.
+    pub m: Pllm,
+    /// The PLL multiplier.
+    ///
+    /// The multiplied clock – `source` divided by `m` times `n` – must be between 128 and 544
+    /// MHz. The upper limit may be lower depending on the `Config { voltage_range }`.
+    pub n: Plln,
+    /// The divider for the R output.
+    ///
+    /// When used to drive the system clock, `source` divided by `m` times `n` divided by `r`
+    /// must not exceed 160 MHz. System clocks above 55 MHz require a non-default
+    /// `Config { voltage_range }`.
+    pub r: Plldiv,
+}
+
+impl PllConfig {
+    /// A configuration for HSI16 / 1 * 10 / 1 = 160 MHz
+    pub const fn hsi16_160mhz() -> Self {
+        PllConfig {
+            source: PllSrc::HSI16,
+            m: Pllm::DIV1,
+            n: Plln::MUL10,
+            r: Plldiv::DIV1,
+        }
+    }
+
+    /// A configuration for MSIS @ 48 MHz / 3 * 10 / 1 = 160 MHz
+    pub const fn msis_160mhz() -> Self {
+        PllConfig {
+            source: PllSrc::MSIS(Msirange::RANGE_48MHZ),
+            m: Pllm::DIV3,
+            n: Plln::MUL10,
+            r: Plldiv::DIV1,
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
 pub enum PllSrc {
-    MSI(MSIRange),
+    /// Use an internal medium speed oscillator as the PLL source.
+    MSIS(Msirange),
+    /// Use the external high speed clock as the system PLL source.
+    ///
+    /// HSE clocks faster than 25 MHz require at least `VoltageScale::RANGE3`, and HSE clocks must
+    /// never exceed 50 MHz.
     HSE(Hertz),
+    /// Use the 16 MHz internal high speed oscillator as the PLL source.
     HSI16,
 }
 
 impl Into<Pllsrc> for PllSrc {
     fn into(self) -> Pllsrc {
         match self {
-            PllSrc::MSI(..) => Pllsrc::MSIS,
+            PllSrc::MSIS(..) => Pllsrc::MSIS,
             PllSrc::HSE(..) => Pllsrc::HSE,
             PllSrc::HSI16 => Pllsrc::HSI16,
         }
     }
 }
 
-seq_macro::seq!(N in 2..=128 {
-    #[derive(Copy, Clone, Debug)]
-    pub enum PllClkDiv {
-        NotDivided,
-        #(
-            Div~N = (N-1),
-        )*
-    }
-
-    impl PllClkDiv {
-        fn to_div(&self) -> u8 {
-            match self {
-                PllClkDiv::NotDivided => 1,
-                #(
-                    PllClkDiv::Div~N => N + 1,
-                )*
-            }
-        }
-    }
-});
-
-impl Into<u8> for PllClkDiv {
-    fn into(self) -> u8 {
-        (self as u8) + 1
-    }
-}
-
-seq_macro::seq!(N in 4..=512 {
-    #[derive(Copy, Clone, Debug)]
-    pub enum PllN {
-        NotMultiplied,
-        #(
-            Mul~N = N-1,
-        )*
-    }
-
-    impl PllN {
-        fn to_mul(&self) -> u16 {
-            match self {
-                PllN::NotMultiplied => 1,
-                #(
-                    PllN::Mul~N => N + 1,
-                )*
-            }
-        }
-    }
-});
-
-impl Into<u16> for PllN {
-    fn into(self) -> u16 {
-        (self as u16) + 1
-    }
-}
-
-// Pre-division
-#[derive(Copy, Clone, Debug)]
-pub enum PllM {
-    NotDivided = 0b0000,
-    Div2 = 0b0001,
-    Div3 = 0b0010,
-    Div4 = 0b0011,
-    Div5 = 0b0100,
-    Div6 = 0b0101,
-    Div7 = 0b0110,
-    Div8 = 0b0111,
-    Div9 = 0b1000,
-    Div10 = 0b1001,
-    Div11 = 0b1010,
-    Div12 = 0b1011,
-    Div13 = 0b1100,
-    Div14 = 0b1101,
-    Div15 = 0b1110,
-    Div16 = 0b1111,
-}
-
-impl Into<Pllm> for PllM {
-    fn into(self) -> Pllm {
-        Pllm::from_bits(self as u8)
-    }
-}
-
 impl Into<Sw> for ClockSrc {
     fn into(self) -> Sw {
         match self {
@@ -130,61 +111,6 @@ impl Into<Sw> for ClockSrc {
     }
 }
 
-#[derive(Debug, Copy, Clone)]
-pub enum MSIRange {
-    Range48mhz = 48_000_000,
-    Range24mhz = 24_000_000,
-    Range16mhz = 16_000_000,
-    Range12mhz = 12_000_000,
-    Range4mhz = 4_000_000,
-    Range2mhz = 2_000_000,
-    Range1_33mhz = 1_330_000,
-    Range1mhz = 1_000_000,
-    Range3_072mhz = 3_072_000,
-    Range1_536mhz = 1_536_000,
-    Range1_024mhz = 1_024_000,
-    Range768khz = 768_000,
-    Range400khz = 400_000,
-    Range200khz = 200_000,
-    Range133khz = 133_000,
-    Range100khz = 100_000,
-}
-
-impl Into<u32> for MSIRange {
-    fn into(self) -> u32 {
-        self as u32
-    }
-}
-
-impl Into<Msirange> for MSIRange {
-    fn into(self) -> Msirange {
-        match self {
-            MSIRange::Range48mhz => Msirange::RANGE_48MHZ,
-            MSIRange::Range24mhz => Msirange::RANGE_24MHZ,
-            MSIRange::Range16mhz => Msirange::RANGE_16MHZ,
-            MSIRange::Range12mhz => Msirange::RANGE_12MHZ,
-            MSIRange::Range4mhz => Msirange::RANGE_4MHZ,
-            MSIRange::Range2mhz => Msirange::RANGE_2MHZ,
-            MSIRange::Range1_33mhz => Msirange::RANGE_1_33MHZ,
-            MSIRange::Range1mhz => Msirange::RANGE_1MHZ,
-            MSIRange::Range3_072mhz => Msirange::RANGE_3_072MHZ,
-            MSIRange::Range1_536mhz => Msirange::RANGE_1_536MHZ,
-            MSIRange::Range1_024mhz => Msirange::RANGE_1_024MHZ,
-            MSIRange::Range768khz => Msirange::RANGE_768KHZ,
-            MSIRange::Range400khz => Msirange::RANGE_400KHZ,
-            MSIRange::Range200khz => Msirange::RANGE_200KHZ,
-            MSIRange::Range133khz => Msirange::RANGE_133KHZ,
-            MSIRange::Range100khz => Msirange::RANGE_100KHZ,
-        }
-    }
-}
-
-impl Default for MSIRange {
-    fn default() -> Self {
-        MSIRange::Range4mhz
-    }
-}
-
 #[derive(Copy, Clone)]
 pub struct Config {
     pub mux: ClockSrc,
@@ -193,90 +119,207 @@ pub struct Config {
     pub apb2_pre: APBPrescaler,
     pub apb3_pre: APBPrescaler,
     pub hsi48: bool,
+    /// The voltage range influences the maximum clock frequencies for different parts of the
+    /// device. In particular, system clocks exceeding 110 MHz require `RANGE1`, and system clocks
+    /// exceeding 55 MHz require at least `RANGE2`.
+    ///
+    /// See RM0456 § 10.5.4 for a general overview and § 11.4.10 for clock source frequency limits.
+    pub voltage_range: VoltageScale,
+}
+
+impl Config {
+    unsafe fn init_hsi16(&self) -> Hertz {
+        RCC.cr().write(|w| w.set_hsion(true));
+        while !RCC.cr().read().hsirdy() {}
+
+        HSI_FREQ
+    }
+
+    unsafe fn init_hse(&self, frequency: Hertz) -> Hertz {
+        // Check frequency limits per RM456 § 11.4.10
+        match self.voltage_range {
+            VoltageScale::RANGE1 | VoltageScale::RANGE2 | VoltageScale::RANGE3 => {
+                assert!(frequency.0 <= 50_000_000);
+            }
+            VoltageScale::RANGE4 => {
+                assert!(frequency.0 <= 25_000_000);
+            }
+        }
+
+        // Enable HSE, and wait for it to stabilize
+        RCC.cr().write(|w| w.set_hseon(true));
+        while !RCC.cr().read().hserdy() {}
+
+        frequency
+    }
+
+    unsafe fn init_msis(&self, range: Msirange) -> Hertz {
+        // Check MSI output per RM0456 § 11.4.10
+        match self.voltage_range {
+            VoltageScale::RANGE4 => {
+                assert!(msirange_to_hertz(range).0 <= 24_000_000);
+            }
+            _ => {}
+        }
+
+        // RM0456 § 11.8.2: spin until MSIS is off or MSIS is ready before setting its range
+        loop {
+            let cr = RCC.cr().read();
+            if cr.msison() == false || cr.msisrdy() == true {
+                break;
+            }
+        }
+
+        RCC.icscr1().modify(|w| {
+            w.set_msisrange(range);
+            w.set_msirgsel(Msirgsel::RCC_ICSCR1);
+        });
+        RCC.cr().write(|w| {
+            w.set_msipllen(false);
+            w.set_msison(true);
+        });
+        while !RCC.cr().read().msisrdy() {}
+        msirange_to_hertz(range)
+    }
 }
 
 impl Default for Config {
     fn default() -> Self {
         Self {
-            mux: ClockSrc::MSI(MSIRange::default()),
+            mux: ClockSrc::default(),
             ahb_pre: AHBPrescaler::DIV1,
             apb1_pre: APBPrescaler::DIV1,
             apb2_pre: APBPrescaler::DIV1,
             apb3_pre: APBPrescaler::DIV1,
             hsi48: false,
+            voltage_range: VoltageScale::RANGE3,
         }
     }
 }
 
 pub(crate) unsafe fn init(config: Config) {
+    // Ensure PWR peripheral clock is enabled
+    RCC.ahb3enr().modify(|w| {
+        w.set_pwren(true);
+    });
+    RCC.ahb3enr().read(); // synchronize
+
+    // Set the requested power mode
+    PWR.vosr().modify(|w| {
+        w.set_vos(config.voltage_range);
+    });
+    while !PWR.vosr().read().vosrdy() {}
+
     let sys_clk = match config.mux {
-        ClockSrc::MSI(range) => {
-            RCC.icscr1().modify(|w| {
-                let bits: Msirange = range.into();
-                w.set_msisrange(bits);
-                w.set_msirgsel(Msirgsel::RCC_ICSCR1);
-            });
-            RCC.cr().write(|w| {
-                w.set_msipllen(false);
-                w.set_msison(true);
-            });
-            while !RCC.cr().read().msisrdy() {}
-
-            range.into()
-        }
-        ClockSrc::HSE(freq) => {
-            RCC.cr().write(|w| w.set_hseon(true));
-            while !RCC.cr().read().hserdy() {}
-
-            freq.0
-        }
-        ClockSrc::HSI16 => {
-            RCC.cr().write(|w| w.set_hsion(true));
-            while !RCC.cr().read().hsirdy() {}
-
-            HSI_FREQ.0
-        }
-        ClockSrc::PLL1R(src, m, n, div) => {
-            let freq = match src {
-                PllSrc::MSI(_) => {
-                    // TODO: enable MSI
-                    MSIRange::default().into()
-                }
-                PllSrc::HSE(hertz) => {
-                    // TODO: enable HSE
-                    hertz.0
-                }
-                PllSrc::HSI16 => {
-                    RCC.cr().write(|w| w.set_hsion(true));
-                    while !RCC.cr().read().hsirdy() {}
-
-                    HSI_FREQ.0
-                }
+        ClockSrc::MSI(range) => config.init_msis(range),
+        ClockSrc::HSE(freq) => config.init_hse(freq),
+        ClockSrc::HSI16 => config.init_hsi16(),
+        ClockSrc::PLL1R(pll) => {
+            // Configure the PLL source
+            let source_clk = match pll.source {
+                PllSrc::MSIS(range) => config.init_msis(range),
+                PllSrc::HSE(hertz) => config.init_hse(hertz),
+                PllSrc::HSI16 => config.init_hsi16(),
             };
 
-            // disable
+            // Calculate the reference clock, which is the source divided by m
+            let reference_clk = source_clk / pll.m;
+
+            // Check limits per RM0456 § 11.4.6
+            assert!(Hertz::mhz(4) <= reference_clk && reference_clk <= Hertz::mhz(16));
+
+            // Calculate the PLL1 VCO clock and PLL1 R output clock
+            let pll1_clk = reference_clk * pll.n;
+            let pll1r_clk = pll1_clk / pll.r;
+
+            // Check system clock per RM0456 § 11.4.9
+            assert!(pll1r_clk <= Hertz::mhz(160));
+
+            // Check PLL clocks per RM0456 § 11.4.10
+            match config.voltage_range {
+                VoltageScale::RANGE1 => {
+                    assert!(pll1_clk >= Hertz::mhz(128) && pll1_clk <= Hertz::mhz(544));
+                    assert!(pll1r_clk <= Hertz::mhz(208));
+                }
+                VoltageScale::RANGE2 => {
+                    assert!(pll1_clk >= Hertz::mhz(128) && pll1_clk <= Hertz::mhz(544));
+                    assert!(pll1r_clk <= Hertz::mhz(110));
+                }
+                VoltageScale::RANGE3 => {
+                    assert!(pll1_clk >= Hertz::mhz(128) && pll1_clk <= Hertz::mhz(330));
+                    assert!(pll1r_clk <= Hertz::mhz(55));
+                }
+                VoltageScale::RANGE4 => {
+                    panic!("PLL is unavailable in voltage range 4");
+                }
+            }
+
+            // § 10.5.4: if we're targeting >= 55 MHz, we must configure PLL1MBOOST to a prescaler
+            // value that results in an output between 4 and 16 MHz for the PWR EPOD boost
+            let mboost = if pll1r_clk >= Hertz::mhz(55) {
+                // source_clk can be up to 50 MHz, so there's just a few cases:
+                if source_clk > Hertz::mhz(32) {
+                    // Divide by 4, giving EPOD 8-12.5 MHz
+                    Pllmboost::DIV4
+                } else if source_clk > Hertz::mhz(16) {
+                    // Divide by 2, giving EPOD 8-16 MHz
+                    Pllmboost::DIV2
+                } else {
+                    // Bypass, giving EPOD 4-16 MHz
+                    Pllmboost::DIV1
+                }
+            } else {
+                // Nothing to do
+                Pllmboost::DIV1
+            };
+
+            // Disable the PLL, and wait for it to disable
             RCC.cr().modify(|w| w.set_pllon(0, false));
             while RCC.cr().read().pllrdy(0) {}
 
-            let vco = freq * n as u8 as u32;
-            let pll_ck = vco / (div as u8 as u32 + 1);
-
+            // Configure the PLL
             RCC.pll1cfgr().write(|w| {
-                w.set_pllm(m.into());
-                w.set_pllsrc(src.into());
+                // Configure PLL1 source and prescaler
+                w.set_pllsrc(pll.source.into());
+                w.set_pllm(pll.m);
+
+                // Configure PLL1 input frequncy range
+                let input_range = if reference_clk <= Hertz::mhz(8) {
+                    Pllrge::FREQ_4TO8MHZ
+                } else {
+                    Pllrge::FREQ_8TO16MHZ
+                };
+                w.set_pllrge(input_range);
+
+                // Set the prescaler for PWR EPOD
+                w.set_pllmboost(mboost);
+
+                // Enable PLL1R output
                 w.set_pllren(true);
             });
 
+            // Configure the PLL divisors
             RCC.pll1divr().modify(|w| {
-                w.set_pllr(div.to_div());
-                w.set_plln(n.to_mul());
+                // Set the VCO multiplier
+                w.set_plln(pll.n);
+                // Set the R output divisor
+                w.set_pllr(pll.r);
             });
 
-            // Enable PLL
+            // Do we need the EPOD booster to reach the target clock speed per § 10.5.4?
+            if pll1r_clk >= Hertz::mhz(55) {
+                // Enable the booster
+                PWR.vosr().modify(|w| {
+                    w.set_boosten(true);
+                });
+                while !PWR.vosr().read().boostrdy() {}
+            }
+
+            // Enable the PLL
             RCC.cr().modify(|w| w.set_pllon(0, true));
             while !RCC.cr().read().pllrdy(0) {}
 
-            pll_ck
+            pll1r_clk
         }
     };
 
@@ -285,20 +328,18 @@ pub(crate) unsafe fn init(config: Config) {
         while !RCC.cr().read().hsi48rdy() {}
     }
 
-    // TODO make configurable
-    let power_vos = VoltageScale::RANGE3;
-
-    // states and programming delay
-    let wait_states = match power_vos {
+    // The clock source is ready
+    // Calculate and set the flash wait states
+    let wait_states = match config.voltage_range {
         // VOS 1 range VCORE 1.26V - 1.40V
         VoltageScale::RANGE1 => {
-            if sys_clk < 32_000_000 {
+            if sys_clk.0 < 32_000_000 {
                 0
-            } else if sys_clk < 64_000_000 {
+            } else if sys_clk.0 < 64_000_000 {
                 1
-            } else if sys_clk < 96_000_000 {
+            } else if sys_clk.0 < 96_000_000 {
                 2
-            } else if sys_clk < 128_000_000 {
+            } else if sys_clk.0 < 128_000_000 {
                 3
             } else {
                 4
@@ -306,11 +347,11 @@ pub(crate) unsafe fn init(config: Config) {
         }
         // VOS 2 range VCORE 1.15V - 1.26V
         VoltageScale::RANGE2 => {
-            if sys_clk < 30_000_000 {
+            if sys_clk.0 < 30_000_000 {
                 0
-            } else if sys_clk < 60_000_000 {
+            } else if sys_clk.0 < 60_000_000 {
                 1
-            } else if sys_clk < 90_000_000 {
+            } else if sys_clk.0 < 90_000_000 {
                 2
             } else {
                 3
@@ -318,9 +359,9 @@ pub(crate) unsafe fn init(config: Config) {
         }
         // VOS 3 range VCORE 1.05V - 1.15V
         VoltageScale::RANGE3 => {
-            if sys_clk < 24_000_000 {
+            if sys_clk.0 < 24_000_000 {
                 0
-            } else if sys_clk < 48_000_000 {
+            } else if sys_clk.0 < 48_000_000 {
                 1
             } else {
                 2
@@ -328,80 +369,101 @@ pub(crate) unsafe fn init(config: Config) {
         }
         // VOS 4 range VCORE 0.95V - 1.05V
         VoltageScale::RANGE4 => {
-            if sys_clk < 12_000_000 {
+            if sys_clk.0 < 12_000_000 {
                 0
             } else {
                 1
             }
         }
     };
-
     FLASH.acr().modify(|w| {
         w.set_latency(wait_states);
     });
 
+    // Switch the system clock source
     RCC.cfgr1().modify(|w| {
         w.set_sw(config.mux.into());
     });
 
+    // RM0456 § 11.4.9 specifies maximum bus frequencies per voltage range, but the maximum bus
+    // frequency for each voltage range exactly matches the maximum permitted PLL output frequency.
+    // Given that:
+    //
+    //   1. Any bus frequency can never exceed the system clock frequency;
+    //   2. We checked the PLL output frequency if we're using it as a system clock;
+    //   3. The maximum HSE frequencies at each voltage range are lower than the bus limits, and
+    //      we checked the HSE frequency if configured as a system clock; and
+    //   4. The maximum frequencies from the other clock sources are lower than the lowest bus
+    //      frequency limit
+    //
+    // ...then we do not need to perform additional bus-related frequency checks.
+
+    // Configure the bus prescalers
     RCC.cfgr2().modify(|w| {
-        w.set_hpre(config.ahb_pre.into());
-        w.set_ppre1(config.apb1_pre.into());
-        w.set_ppre2(config.apb2_pre.into());
+        w.set_hpre(config.ahb_pre);
+        w.set_ppre1(config.apb1_pre);
+        w.set_ppre2(config.apb2_pre);
     });
-
     RCC.cfgr3().modify(|w| {
-        w.set_ppre3(config.apb3_pre.into());
+        w.set_ppre3(config.apb3_pre);
     });
 
-    let ahb_freq: u32 = match config.ahb_pre {
-        AHBPrescaler::DIV1 => sys_clk,
-        pre => {
-            let pre: u8 = pre.into();
-            let pre = 1 << (pre as u32 - 7);
-            sys_clk / pre
-        }
-    };
+    let ahb_freq = sys_clk / config.ahb_pre;
 
     let (apb1_freq, apb1_tim_freq) = match config.apb1_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: u8 = pre.into();
-            let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     let (apb2_freq, apb2_tim_freq) = match config.apb2_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: u8 = pre.into();
-            let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     let (apb3_freq, _apb3_tim_freq) = match config.apb3_pre {
         APBPrescaler::DIV1 => (ahb_freq, ahb_freq),
         pre => {
-            let pre: u8 = pre.into();
-            let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / pre as u32;
-            (freq, freq * 2)
+            let freq = ahb_freq / pre;
+            (freq, freq * 2u32)
         }
     };
 
     set_freqs(Clocks {
-        sys: Hertz(sys_clk),
-        ahb1: Hertz(ahb_freq),
-        ahb2: Hertz(ahb_freq),
-        ahb3: Hertz(ahb_freq),
-        apb1: Hertz(apb1_freq),
-        apb2: Hertz(apb2_freq),
-        apb3: Hertz(apb3_freq),
-        apb1_tim: Hertz(apb1_tim_freq),
-        apb2_tim: Hertz(apb2_tim_freq),
+        sys: sys_clk,
+        ahb1: ahb_freq,
+        ahb2: ahb_freq,
+        ahb3: ahb_freq,
+        apb1: apb1_freq,
+        apb2: apb2_freq,
+        apb3: apb3_freq,
+        apb1_tim: apb1_tim_freq,
+        apb2_tim: apb2_tim_freq,
     });
 }
+
+fn msirange_to_hertz(range: Msirange) -> Hertz {
+    match range {
+        Msirange::RANGE_48MHZ => Hertz(48_000_000),
+        Msirange::RANGE_24MHZ => Hertz(24_000_000),
+        Msirange::RANGE_16MHZ => Hertz(16_000_000),
+        Msirange::RANGE_12MHZ => Hertz(12_000_000),
+        Msirange::RANGE_4MHZ => Hertz(4_000_000),
+        Msirange::RANGE_2MHZ => Hertz(2_000_000),
+        Msirange::RANGE_1_33MHZ => Hertz(1_330_000),
+        Msirange::RANGE_1MHZ => Hertz(1_000_000),
+        Msirange::RANGE_3_072MHZ => Hertz(3_072_000),
+        Msirange::RANGE_1_536MHZ => Hertz(1_536_000),
+        Msirange::RANGE_1_024MHZ => Hertz(1_024_000),
+        Msirange::RANGE_768KHZ => Hertz(768_000),
+        Msirange::RANGE_400KHZ => Hertz(400_000),
+        Msirange::RANGE_200KHZ => Hertz(200_000),
+        Msirange::RANGE_133KHZ => Hertz(133_000),
+        Msirange::RANGE_100KHZ => Hertz(100_000),
+    }
+}
diff --git a/embassy-stm32/src/rcc/wb.rs b/embassy-stm32/src/rcc/wb.rs
index ee45a342..ee2a8ae1 100644
--- a/embassy-stm32/src/rcc/wb.rs
+++ b/embassy-stm32/src/rcc/wb.rs
@@ -1,4 +1,4 @@
-pub use super::bus::{AHBPrescaler, APBPrescaler};
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
 use crate::rcc::bd::{BackupDomain, RtcClockSource};
 use crate::rcc::Clocks;
 use crate::time::{khz, mhz, Hertz};
diff --git a/embassy-stm32/src/rcc/wl.rs b/embassy-stm32/src/rcc/wl.rs
index 937f5550..7baedfcd 100644
--- a/embassy-stm32/src/rcc/wl.rs
+++ b/embassy-stm32/src/rcc/wl.rs
@@ -1,6 +1,6 @@
-pub use super::bus::{AHBPrescaler, APBPrescaler};
 pub use crate::pac::pwr::vals::Vos as VoltageScale;
 use crate::pac::rcc::vals::Adcsel;
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
 use crate::pac::{FLASH, RCC};
 use crate::rcc::bd::{BackupDomain, RtcClockSource};
 use crate::rcc::{set_freqs, Clocks};
diff --git a/embassy-stm32/src/rng.rs b/embassy-stm32/src/rng.rs
index 5080cf03..2d7ffc62 100644
--- a/embassy-stm32/src/rng.rs
+++ b/embassy-stm32/src/rng.rs
@@ -13,6 +13,7 @@ use crate::{interrupt, pac, peripherals, Peripheral};
 
 static RNG_WAKER: AtomicWaker = AtomicWaker::new();
 
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     SeedError,
diff --git a/embassy-stm32/src/sai/mod.rs b/embassy-stm32/src/sai/mod.rs
index 5eecb637..4c3604e5 100644
--- a/embassy-stm32/src/sai/mod.rs
+++ b/embassy-stm32/src/sai/mod.rs
@@ -11,7 +11,7 @@ use crate::pac::sai::{vals, Sai as Regs};
 use crate::rcc::RccPeripheral;
 use crate::{peripherals, Peripheral};
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     NotATransmitter,
diff --git a/embassy-stm32/src/spi/mod.rs b/embassy-stm32/src/spi/mod.rs
index 14333ba2..bd70342c 100644
--- a/embassy-stm32/src/spi/mod.rs
+++ b/embassy-stm32/src/spi/mod.rs
@@ -15,7 +15,7 @@ use crate::rcc::RccPeripheral;
 use crate::time::Hertz;
 use crate::{peripherals, Peripheral};
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     Framing,
diff --git a/embassy-stm32/src/timer/complementary_pwm.rs b/embassy-stm32/src/timer/complementary_pwm.rs
index 4f033e3a..0ab72734 100644
--- a/embassy-stm32/src/timer/complementary_pwm.rs
+++ b/embassy-stm32/src/timer/complementary_pwm.rs
@@ -122,6 +122,46 @@ impl<'d, T: ComplementaryCaptureCompare16bitInstance> ComplementaryPwm<'d, T> {
     }
 }
 
+impl<'d, T: ComplementaryCaptureCompare16bitInstance> embedded_hal_02::Pwm for ComplementaryPwm<'d, T> {
+    type Channel = Channel;
+    type Time = Hertz;
+    type Duty = u16;
+
+    fn disable(&mut self, channel: Self::Channel) {
+        self.inner.enable_complementary_channel(channel, false);
+        self.inner.enable_channel(channel, false);
+    }
+
+    fn enable(&mut self, channel: Self::Channel) {
+        self.inner.enable_channel(channel, true);
+        self.inner.enable_complementary_channel(channel, true);
+    }
+
+    fn get_period(&self) -> Self::Time {
+        self.inner.get_frequency().into()
+    }
+
+    fn get_duty(&self, channel: Self::Channel) -> Self::Duty {
+        self.inner.get_compare_value(channel)
+    }
+
+    fn get_max_duty(&self) -> Self::Duty {
+        self.inner.get_max_compare_value() + 1
+    }
+
+    fn set_duty(&mut self, channel: Self::Channel, duty: Self::Duty) {
+        assert!(duty <= self.get_max_duty());
+        self.inner.set_compare_value(channel, duty)
+    }
+
+    fn set_period<P>(&mut self, period: P)
+    where
+        P: Into<Self::Time>,
+    {
+        self.inner.set_frequency(period.into());
+    }
+}
+
 fn compute_dead_time_value(value: u16) -> (Ckd, u8) {
     /*
         Dead-time = T_clk * T_dts * T_dtg
diff --git a/embassy-stm32/src/timer/mod.rs b/embassy-stm32/src/timer/mod.rs
index d88fbcfd..1e0999ed 100644
--- a/embassy-stm32/src/timer/mod.rs
+++ b/embassy-stm32/src/timer/mod.rs
@@ -70,6 +70,16 @@ pub(crate) mod sealed {
         fn set_autoreload_preload(&mut self, enable: vals::Arpe) {
             Self::regs().cr1().modify(|r| r.set_arpe(enable));
         }
+
+        fn get_frequency(&self) -> Hertz {
+            let timer_f = Self::frequency();
+
+            let regs = Self::regs();
+            let arr = regs.arr().read().arr();
+            let psc = regs.psc().read().psc();
+
+            timer_f / arr / (psc + 1)
+        }
     }
 
     pub trait GeneralPurpose16bitInstance: Basic16bitInstance {
@@ -103,6 +113,16 @@ pub(crate) mod sealed {
             regs.egr().write(|r| r.set_ug(true));
             regs.cr1().modify(|r| r.set_urs(vals::Urs::ANYEVENT));
         }
+
+        fn get_frequency(&self) -> Hertz {
+            let timer_f = Self::frequency();
+
+            let regs = Self::regs_gp32();
+            let arr = regs.arr().read().arr();
+            let psc = regs.psc().read().psc();
+
+            timer_f / arr / (psc + 1)
+        }
     }
 
     pub trait AdvancedControlInstance: GeneralPurpose16bitInstance {
@@ -183,6 +203,10 @@ pub(crate) mod sealed {
         fn get_max_compare_value(&self) -> u16 {
             Self::regs_gp16().arr().read().arr()
         }
+
+        fn get_compare_value(&self, channel: Channel) -> u16 {
+            Self::regs_gp16().ccr(channel.raw()).read().ccr()
+        }
     }
 
     pub trait ComplementaryCaptureCompare16bitInstance: CaptureCompare16bitInstance + AdvancedControlInstance {
@@ -219,6 +243,10 @@ pub(crate) mod sealed {
         fn get_max_compare_value(&self) -> u32 {
             Self::regs_gp32().arr().read().arr()
         }
+
+        fn get_compare_value(&self, channel: Channel) -> u32 {
+            Self::regs_gp32().ccr(channel.raw()).read().ccr()
+        }
     }
 }
 
diff --git a/embassy-stm32/src/timer/simple_pwm.rs b/embassy-stm32/src/timer/simple_pwm.rs
index 9e28878b..2b3a069a 100644
--- a/embassy-stm32/src/timer/simple_pwm.rs
+++ b/embassy-stm32/src/timer/simple_pwm.rs
@@ -109,3 +109,41 @@ impl<'d, T: CaptureCompare16bitInstance> SimplePwm<'d, T> {
         self.inner.set_output_polarity(channel, polarity);
     }
 }
+
+impl<'d, T: CaptureCompare16bitInstance> embedded_hal_02::Pwm for SimplePwm<'d, T> {
+    type Channel = Channel;
+    type Time = Hertz;
+    type Duty = u16;
+
+    fn disable(&mut self, channel: Self::Channel) {
+        self.inner.enable_channel(channel, false);
+    }
+
+    fn enable(&mut self, channel: Self::Channel) {
+        self.inner.enable_channel(channel, true);
+    }
+
+    fn get_period(&self) -> Self::Time {
+        self.inner.get_frequency().into()
+    }
+
+    fn get_duty(&self, channel: Self::Channel) -> Self::Duty {
+        self.inner.get_compare_value(channel)
+    }
+
+    fn get_max_duty(&self) -> Self::Duty {
+        self.inner.get_max_compare_value() + 1
+    }
+
+    fn set_duty(&mut self, channel: Self::Channel, duty: Self::Duty) {
+        assert!(duty <= self.get_max_duty());
+        self.inner.set_compare_value(channel, duty)
+    }
+
+    fn set_period<P>(&mut self, period: P)
+    where
+        P: Into<Self::Time>,
+    {
+        self.inner.set_frequency(period.into());
+    }
+}
diff --git a/examples/stm32f2/src/bin/pll.rs b/examples/stm32f2/src/bin/pll.rs
index 89493761..62aaa980 100644
--- a/examples/stm32f2/src/bin/pll.rs
+++ b/examples/stm32f2/src/bin/pll.rs
@@ -7,7 +7,7 @@ use core::convert::TryFrom;
 use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::rcc::{
-    APBPrescaler, ClockSrc, HSEConfig, HSESrc, PLL48Div, PLLConfig, PLLMainDiv, PLLMul, PLLPreDiv, PLLSrc,
+    APBPrescaler, ClockSrc, HSEConfig, HSESrc, PLLConfig, PLLMul, PLLPDiv, PLLPreDiv, PLLQDiv, PLLSrc,
 };
 use embassy_stm32::time::Hertz;
 use embassy_stm32::Config;
@@ -32,9 +32,9 @@ async fn main(_spawner: Spawner) {
         // 1 MHz PLL input * 240 = 240 MHz PLL VCO
         mul: unwrap!(PLLMul::try_from(240)),
         // 240 MHz PLL VCO / 2 = 120 MHz main PLL output
-        main_div: PLLMainDiv::Div2,
+        p_div: PLLPDiv::DIV2,
         // 240 MHz PLL VCO / 5 = 48 MHz PLL48 output
-        pll48_div: unwrap!(PLL48Div::try_from(5)),
+        q_div: PLLQDiv::DIV5,
     };
     // System clock comes from PLL (= the 120 MHz main PLL output)
     config.rcc.mux = ClockSrc::PLL;
diff --git a/examples/stm32g4/src/bin/adc.rs b/examples/stm32g4/src/bin/adc.rs
index a792748b..da9b18a0 100644
--- a/examples/stm32g4/src/bin/adc.rs
+++ b/examples/stm32g4/src/bin/adc.rs
@@ -16,12 +16,12 @@ async fn main(_spawner: Spawner) {
 
     config.rcc.pll = Some(Pll {
         source: PllSrc::HSI16,
-        prediv_m: PllM::Div4,
-        mul_n: PllN::Mul85,
+        prediv_m: PllM::DIV4,
+        mul_n: PllN::MUL85,
         div_p: None,
         div_q: None,
         // Main system clock at 170 MHz
-        div_r: Some(PllR::Div2),
+        div_r: Some(PllR::DIV2),
     });
 
     config.rcc.adc12_clock_source = AdcClockSource::SysClk;
diff --git a/examples/stm32g4/src/bin/pll.rs b/examples/stm32g4/src/bin/pll.rs
index ef7d4800..f8159cb5 100644
--- a/examples/stm32g4/src/bin/pll.rs
+++ b/examples/stm32g4/src/bin/pll.rs
@@ -15,12 +15,12 @@ async fn main(_spawner: Spawner) {
 
     config.rcc.pll = Some(Pll {
         source: PllSrc::HSI16,
-        prediv_m: PllM::Div4,
-        mul_n: PllN::Mul85,
+        prediv_m: PllM::DIV4,
+        mul_n: PllN::MUL85,
         div_p: None,
         div_q: None,
         // Main system clock at 170 MHz
-        div_r: Some(PllR::Div2),
+        div_r: Some(PllR::DIV2),
     });
 
     config.rcc.mux = ClockSrc::PLL;
diff --git a/examples/stm32g4/src/bin/usb_serial.rs b/examples/stm32g4/src/bin/usb_serial.rs
index 77cfa67d..9099b609 100644
--- a/examples/stm32g4/src/bin/usb_serial.rs
+++ b/examples/stm32g4/src/bin/usb_serial.rs
@@ -25,16 +25,16 @@ async fn main(_spawner: Spawner) {
     // Change this to `false` to use the HSE clock source for the USB. This example assumes an 8MHz HSE.
     const USE_HSI48: bool = true;
 
-    let pllq_div = if USE_HSI48 { None } else { Some(PllQ::Div6) };
+    let pllq_div = if USE_HSI48 { None } else { Some(PllQ::DIV6) };
 
     config.rcc.pll = Some(Pll {
         source: PllSrc::HSE(Hertz(8_000_000)),
-        prediv_m: PllM::Div2,
-        mul_n: PllN::Mul72,
+        prediv_m: PllM::DIV2,
+        mul_n: PllN::MUL72,
         div_p: None,
         div_q: pllq_div,
         // Main system clock at 144 MHz
-        div_r: Some(PllR::Div2),
+        div_r: Some(PllR::DIV2),
     });
 
     config.rcc.mux = ClockSrc::PLL;
diff --git a/examples/stm32h5/src/bin/eth.rs b/examples/stm32h5/src/bin/eth.rs
index 4e92d064..2f445476 100644
--- a/examples/stm32h5/src/bin/eth.rs
+++ b/examples/stm32h5/src/bin/eth.rs
@@ -9,7 +9,9 @@ use embassy_net::{Ipv4Address, Stack, StackResources};
 use embassy_stm32::eth::generic_smi::GenericSMI;
 use embassy_stm32::eth::{Ethernet, PacketQueue};
 use embassy_stm32::peripherals::ETH;
-use embassy_stm32::rcc::{AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllSource, Sysclk, VoltageScale};
+use embassy_stm32::rcc::{
+    AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllDiv, PllMul, PllPreDiv, PllSource, Sysclk, VoltageScale,
+};
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::Hertz;
 use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
@@ -42,10 +44,10 @@ async fn main(spawner: Spawner) -> ! {
     });
     config.rcc.pll1 = Some(Pll {
         source: PllSource::Hse,
-        prediv: 2,
-        mul: 125,
-        divp: Some(2),
-        divq: Some(2),
+        prediv: PllPreDiv::DIV2,
+        mul: PllMul::MUL125,
+        divp: Some(PllDiv::DIV2),
+        divq: Some(PllDiv::DIV2),
         divr: None,
     });
     config.rcc.ahb_pre = AHBPrescaler::DIV1;
diff --git a/examples/stm32h5/src/bin/usb_serial.rs b/examples/stm32h5/src/bin/usb_serial.rs
index cbe540a0..3b3c38e1 100644
--- a/examples/stm32h5/src/bin/usb_serial.rs
+++ b/examples/stm32h5/src/bin/usb_serial.rs
@@ -4,7 +4,9 @@
 
 use defmt::{panic, *};
 use embassy_executor::Spawner;
-use embassy_stm32::rcc::{AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllSource, Sysclk, VoltageScale};
+use embassy_stm32::rcc::{
+    AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllDiv, PllMul, PllPreDiv, PllSource, Sysclk, VoltageScale,
+};
 use embassy_stm32::time::Hertz;
 use embassy_stm32::usb::{Driver, Instance};
 use embassy_stm32::{bind_interrupts, pac, peripherals, usb, Config};
@@ -29,9 +31,9 @@ async fn main(_spawner: Spawner) {
     });
     config.rcc.pll1 = Some(Pll {
         source: PllSource::Hse,
-        prediv: 2,
-        mul: 125,
-        divp: Some(2), // 250mhz
+        prediv: PllPreDiv::DIV2,
+        mul: PllMul::MUL125,
+        divp: Some(PllDiv::DIV2), // 250mhz
         divq: None,
         divr: None,
     });
diff --git a/examples/stm32h7/src/bin/adc.rs b/examples/stm32h7/src/bin/adc.rs
index 77922d4b..7859b86d 100644
--- a/examples/stm32h7/src/bin/adc.rs
+++ b/examples/stm32h7/src/bin/adc.rs
@@ -18,16 +18,16 @@ async fn main(_spawner: Spawner) {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // SPI1 cksel defaults to pll1_q
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // SPI1 cksel defaults to pll1_q
             divr: None,
         });
         config.rcc.pll2 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(8), // 100mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV8), // 100mhz
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32h7/src/bin/camera.rs b/examples/stm32h7/src/bin/camera.rs
index 0ea8b449..40ef16cf 100644
--- a/examples/stm32h7/src/bin/camera.rs
+++ b/examples/stm32h7/src/bin/camera.rs
@@ -32,10 +32,10 @@ async fn main(_spawner: Spawner) {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // 100mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // 100mhz
             divr: None,
         });
         config.rcc.sys = Sysclk::Pll1P; // 400 Mhz
@@ -184,7 +184,7 @@ mod ov7725 {
 
     const CAM_ADDR: u8 = 0x21;
 
-    #[derive(Format)]
+    #[derive(Format, PartialEq, Eq)]
     pub enum Error<I2cError: Format> {
         I2c(I2cError),
     }
diff --git a/examples/stm32h7/src/bin/dac.rs b/examples/stm32h7/src/bin/dac.rs
index 93df7a31..82122189 100644
--- a/examples/stm32h7/src/bin/dac.rs
+++ b/examples/stm32h7/src/bin/dac.rs
@@ -20,16 +20,16 @@ fn main() -> ! {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // SPI1 cksel defaults to pll1_q
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // 100mhz
             divr: None,
         });
         config.rcc.pll2 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(8), // 100mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV8), // 100mhz
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32h7/src/bin/dac_dma.rs b/examples/stm32h7/src/bin/dac_dma.rs
index 8c921abc..933641ae 100644
--- a/examples/stm32h7/src/bin/dac_dma.rs
+++ b/examples/stm32h7/src/bin/dac_dma.rs
@@ -28,16 +28,16 @@ async fn main(spawner: Spawner) {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // SPI1 cksel defaults to pll1_q
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // 100mhz
             divr: None,
         });
         config.rcc.pll2 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(8), // 100mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV8), // 100mhz
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32h7/src/bin/eth.rs b/examples/stm32h7/src/bin/eth.rs
index 1b5d71ed..a6603d50 100644
--- a/examples/stm32h7/src/bin/eth.rs
+++ b/examples/stm32h7/src/bin/eth.rs
@@ -39,9 +39,9 @@ async fn main(spawner: Spawner) -> ! {
         config.rcc.hsi48 = true; // needed for RNG
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32h7/src/bin/eth_client.rs b/examples/stm32h7/src/bin/eth_client.rs
index 3abd31c7..596de2f4 100644
--- a/examples/stm32h7/src/bin/eth_client.rs
+++ b/examples/stm32h7/src/bin/eth_client.rs
@@ -40,9 +40,9 @@ async fn main(spawner: Spawner) -> ! {
         config.rcc.hsi48 = true; // needed for RNG
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32h7/src/bin/fmc.rs b/examples/stm32h7/src/bin/fmc.rs
index de0b351d..7ae87b02 100644
--- a/examples/stm32h7/src/bin/fmc.rs
+++ b/examples/stm32h7/src/bin/fmc.rs
@@ -18,10 +18,10 @@ async fn main(_spawner: Spawner) {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // 100mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // 100mhz
             divr: None,
         });
         config.rcc.sys = Sysclk::Pll1P; // 400 Mhz
diff --git a/examples/stm32h7/src/bin/low_level_timer_api.rs b/examples/stm32h7/src/bin/low_level_timer_api.rs
index a1e955c3..f4fa0690 100644
--- a/examples/stm32h7/src/bin/low_level_timer_api.rs
+++ b/examples/stm32h7/src/bin/low_level_timer_api.rs
@@ -22,10 +22,10 @@ async fn main(_spawner: Spawner) {
         config.rcc.hsi48 = true; // needed for RNG
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // 100 Mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // 100mhz
             divr: None,
         });
         config.rcc.sys = Sysclk::Pll1P; // 400 Mhz
diff --git a/examples/stm32h7/src/bin/pwm.rs b/examples/stm32h7/src/bin/pwm.rs
index 5c8e57aa..37e4c92c 100644
--- a/examples/stm32h7/src/bin/pwm.rs
+++ b/examples/stm32h7/src/bin/pwm.rs
@@ -21,9 +21,9 @@ async fn main(_spawner: Spawner) {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32h7/src/bin/sdmmc.rs b/examples/stm32h7/src/bin/sdmmc.rs
index 752aefdf..ecb8d654 100644
--- a/examples/stm32h7/src/bin/sdmmc.rs
+++ b/examples/stm32h7/src/bin/sdmmc.rs
@@ -22,10 +22,10 @@ async fn main(_spawner: Spawner) -> ! {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(4), // default clock chosen by SDMMCSEL. 200 Mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV4), // default clock chosen by SDMMCSEL. 200 Mhz
             divr: None,
         });
         config.rcc.sys = Sysclk::Pll1P; // 400 Mhz
diff --git a/examples/stm32h7/src/bin/spi.rs b/examples/stm32h7/src/bin/spi.rs
index 9fe46f03..f128d4a5 100644
--- a/examples/stm32h7/src/bin/spi.rs
+++ b/examples/stm32h7/src/bin/spi.rs
@@ -44,10 +44,10 @@ fn main() -> ! {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(4), // used by SPI3. 100Mhz.
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // used by SPI3. 100Mhz.
             divr: None,
         });
         config.rcc.sys = Sysclk::Pll1P; // 400 Mhz
diff --git a/examples/stm32h7/src/bin/spi_dma.rs b/examples/stm32h7/src/bin/spi_dma.rs
index 88d65d5b..d4c0bcdb 100644
--- a/examples/stm32h7/src/bin/spi_dma.rs
+++ b/examples/stm32h7/src/bin/spi_dma.rs
@@ -40,10 +40,10 @@ fn main() -> ! {
         config.rcc.csi = true;
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(4), // used by SPI3. 100Mhz.
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // used by SPI3. 100Mhz.
             divr: None,
         });
         config.rcc.sys = Sysclk::Pll1P; // 400 Mhz
diff --git a/examples/stm32h7/src/bin/usb_serial.rs b/examples/stm32h7/src/bin/usb_serial.rs
index 14de4356..c1e5144b 100644
--- a/examples/stm32h7/src/bin/usb_serial.rs
+++ b/examples/stm32h7/src/bin/usb_serial.rs
@@ -28,9 +28,9 @@ async fn main(_spawner: Spawner) {
         config.rcc.hsi48 = true; // needed for USB
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
             divq: None,
             divr: None,
         });
diff --git a/examples/stm32l4/src/bin/rng.rs b/examples/stm32l4/src/bin/rng.rs
index 806e49f5..d0208d8a 100644
--- a/examples/stm32l4/src/bin/rng.rs
+++ b/examples/stm32l4/src/bin/rng.rs
@@ -4,7 +4,7 @@
 
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_stm32::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv};
+use embassy_stm32::rcc::{ClockSrc, PLLSource, PllMul, PllPreDiv, PllQDiv, PllRDiv};
 use embassy_stm32::rng::Rng;
 use embassy_stm32::{bind_interrupts, peripherals, rng, Config};
 use {defmt_rtt as _, panic_probe as _};
@@ -19,10 +19,10 @@ async fn main(_spawner: Spawner) {
     // 72Mhz clock (16 / 1 * 18 / 4)
     config.rcc.mux = ClockSrc::PLL(
         PLLSource::HSI16,
-        PLLClkDiv::Div4,
-        PLLSrcDiv::Div1,
-        PLLMul::Mul18,
-        Some(PLLClkDiv::Div6), // 48Mhz (16 / 1 * 18 / 6)
+        PllRDiv::DIV4,
+        PllPreDiv::DIV1,
+        PllMul::MUL18,
+        Some(PllQDiv::DIV6), // 48Mhz (16 / 1 * 18 / 6)
     );
     let p = embassy_stm32::init(config);
 
diff --git a/examples/stm32l4/src/bin/rtc.rs b/examples/stm32l4/src/bin/rtc.rs
index eb1eed01..7e2b8c78 100644
--- a/examples/stm32l4/src/bin/rtc.rs
+++ b/examples/stm32l4/src/bin/rtc.rs
@@ -5,7 +5,7 @@
 use chrono::{NaiveDate, NaiveDateTime};
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_stm32::rcc::{self, ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv};
+use embassy_stm32::rcc::{self, ClockSrc, PLLSource, PllMul, PllPreDiv, PllRDiv};
 use embassy_stm32::rtc::{Rtc, RtcConfig};
 use embassy_stm32::time::Hertz;
 use embassy_stm32::Config;
@@ -18,9 +18,9 @@ async fn main(_spawner: Spawner) {
         let mut config = Config::default();
         config.rcc.mux = ClockSrc::PLL(
             PLLSource::HSE(Hertz::mhz(8)),
-            PLLClkDiv::Div2,
-            PLLSrcDiv::Div1,
-            PLLMul::Mul20,
+            PllRDiv::DIV2,
+            PllPreDiv::DIV1,
+            PllMul::MUL20,
             None,
         );
         config.rcc.lse = Some(Hertz(32_768));
diff --git a/examples/stm32l4/src/bin/spe_adin1110_http_server.rs b/examples/stm32l4/src/bin/spe_adin1110_http_server.rs
index 28752158..8db89be2 100644
--- a/examples/stm32l4/src/bin/spe_adin1110_http_server.rs
+++ b/examples/stm32l4/src/bin/spe_adin1110_http_server.rs
@@ -49,7 +49,7 @@ use embassy_net_adin1110::{self, Device, Runner, ADIN1110};
 use embedded_hal_bus::spi::ExclusiveDevice;
 use hal::gpio::Pull;
 use hal::i2c::Config as I2C_Config;
-use hal::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv};
+use hal::rcc::{ClockSrc, PLLSource, PllMul, PllPreDiv, PllRDiv};
 use hal::spi::{Config as SPI_Config, Spi};
 use hal::time::Hertz;
 
@@ -80,9 +80,9 @@ async fn main(spawner: Spawner) {
     // 80MHz highest frequency for flash 0 wait.
     config.rcc.mux = ClockSrc::PLL(
         PLLSource::HSE(Hertz(8_000_000)),
-        PLLClkDiv::Div2,
-        PLLSrcDiv::Div1,
-        PLLMul::Mul20,
+        PllRDiv::DIV2,
+        PllPreDiv::DIV1,
+        PllMul::MUL20,
         None,
     );
     config.rcc.hsi48 = true; // needed for rng
@@ -366,7 +366,7 @@ pub struct ADT7422<'d, BUS: I2cBus> {
     bus: BUS,
 }
 
-#[derive(Debug, Format)]
+#[derive(Debug, Format, PartialEq, Eq)]
 pub enum Error<I2cError: Format> {
     I2c(I2cError),
     Address,
diff --git a/examples/stm32l4/src/bin/usb_serial.rs b/examples/stm32l4/src/bin/usb_serial.rs
index 410d6891..dc0d98ad 100644
--- a/examples/stm32l4/src/bin/usb_serial.rs
+++ b/examples/stm32l4/src/bin/usb_serial.rs
@@ -23,7 +23,7 @@ async fn main(_spawner: Spawner) {
     info!("Hello World!");
 
     let mut config = Config::default();
-    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PLLClkDiv::Div2, PLLSrcDiv::Div1, PLLMul::Mul10, None);
+    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PllRDiv::DIV2, PllPreDiv::DIV1, PllMul::MUL10, None);
     config.rcc.hsi48 = true;
 
     let p = embassy_stm32::init(config);
diff --git a/examples/stm32l5/src/bin/rng.rs b/examples/stm32l5/src/bin/rng.rs
index 9549d64d..cc3c99b5 100644
--- a/examples/stm32l5/src/bin/rng.rs
+++ b/examples/stm32l5/src/bin/rng.rs
@@ -4,7 +4,7 @@
 
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_stm32::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv};
+use embassy_stm32::rcc::{ClockSrc, PLLSource, PllMul, PllPreDiv, PllQDiv, PllRDiv};
 use embassy_stm32::rng::Rng;
 use embassy_stm32::{bind_interrupts, peripherals, rng, Config};
 use {defmt_rtt as _, panic_probe as _};
@@ -18,10 +18,10 @@ async fn main(_spawner: Spawner) {
     let mut config = Config::default();
     config.rcc.mux = ClockSrc::PLL(
         PLLSource::HSI16,
-        PLLClkDiv::Div2,
-        PLLSrcDiv::Div1,
-        PLLMul::Mul8,
-        Some(PLLClkDiv::Div2),
+        PllRDiv::DIV2,
+        PllPreDiv::DIV1,
+        PllMul::MUL8,
+        Some(PllQDiv::DIV2),
     );
     let p = embassy_stm32::init(config);
 
diff --git a/examples/stm32l5/src/bin/usb_ethernet.rs b/examples/stm32l5/src/bin/usb_ethernet.rs
index 15b84761..498147f9 100644
--- a/examples/stm32l5/src/bin/usb_ethernet.rs
+++ b/examples/stm32l5/src/bin/usb_ethernet.rs
@@ -45,7 +45,7 @@ async fn net_task(stack: &'static Stack<Device<'static, MTU>>) -> ! {
 #[embassy_executor::main]
 async fn main(spawner: Spawner) {
     let mut config = Config::default();
-    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PLLClkDiv::Div2, PLLSrcDiv::Div1, PLLMul::Mul10, None);
+    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PllRDiv::DIV2, PllPreDiv::DIV1, PllMul::MUL10, None);
     config.rcc.hsi48 = true;
     let p = embassy_stm32::init(config);
 
diff --git a/examples/stm32l5/src/bin/usb_hid_mouse.rs b/examples/stm32l5/src/bin/usb_hid_mouse.rs
index 7e894e40..db6a9c76 100644
--- a/examples/stm32l5/src/bin/usb_hid_mouse.rs
+++ b/examples/stm32l5/src/bin/usb_hid_mouse.rs
@@ -22,7 +22,7 @@ bind_interrupts!(struct Irqs {
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = Config::default();
-    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PLLClkDiv::Div2, PLLSrcDiv::Div1, PLLMul::Mul10, None);
+    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PllRDiv::DIV2, PllPreDiv::DIV1, PllMul::MUL10, None);
     config.rcc.hsi48 = true;
     let p = embassy_stm32::init(config);
 
diff --git a/examples/stm32l5/src/bin/usb_serial.rs b/examples/stm32l5/src/bin/usb_serial.rs
index 0c719560..e19ecbf0 100644
--- a/examples/stm32l5/src/bin/usb_serial.rs
+++ b/examples/stm32l5/src/bin/usb_serial.rs
@@ -20,7 +20,7 @@ bind_interrupts!(struct Irqs {
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = Config::default();
-    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PLLClkDiv::Div2, PLLSrcDiv::Div1, PLLMul::Mul10, None);
+    config.rcc.mux = ClockSrc::PLL(PLLSource::HSI16, PllRDiv::DIV2, PllPreDiv::DIV1, PllMul::MUL10, None);
     config.rcc.hsi48 = true;
     let p = embassy_stm32::init(config);
 
diff --git a/examples/stm32u5/src/bin/usb_serial.rs b/examples/stm32u5/src/bin/usb_serial.rs
index 9e47fb18..9b2adb0a 100644
--- a/examples/stm32u5/src/bin/usb_serial.rs
+++ b/examples/stm32u5/src/bin/usb_serial.rs
@@ -23,7 +23,12 @@ async fn main(_spawner: Spawner) {
     info!("Hello World!");
 
     let mut config = Config::default();
-    config.rcc.mux = ClockSrc::PLL1R(PllSrc::HSI16, PllM::Div2, PllN::Mul10, PllClkDiv::NotDivided);
+    config.rcc.mux = ClockSrc::PLL1R(PllConfig {
+        source: PllSrc::HSI16,
+        m: Pllm::DIV2,
+        n: Plln::MUL10,
+        r: Plldiv::DIV1,
+    });
     //config.rcc.mux = ClockSrc::MSI(MSIRange::Range48mhz);
     config.rcc.hsi48 = true;
 
diff --git a/tests/rp/src/bin/bootsel.rs b/tests/rp/src/bin/bootsel.rs
new file mode 100644
index 00000000..df1ed8d2
--- /dev/null
+++ b/tests/rp/src/bin/bootsel.rs
@@ -0,0 +1,26 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+teleprobe_meta::target!(b"rpi-pico");
+
+use defmt::{assert_eq, *};
+use embassy_executor::Spawner;
+use embassy_time::{Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let mut p = embassy_rp::init(Default::default());
+    info!("Hello World!");
+
+    // add some delay to give an attached debug probe time to parse the
+    // defmt RTT header. Reading that header might touch flash memory, which
+    // interferes with flash write operations.
+    // https://github.com/knurling-rs/defmt/pull/683
+    Timer::after(Duration::from_millis(10)).await;
+
+    assert_eq!(p.BOOTSEL.is_pressed(), false);
+
+    info!("Test OK");
+    cortex_m::asm::bkpt();
+}
diff --git a/tests/stm32/src/common.rs b/tests/stm32/src/common.rs
index 32ba03e4..79a9b5e8 100644
--- a/tests/stm32/src/common.rs
+++ b/tests/stm32/src/common.rs
@@ -202,9 +202,9 @@ pub fn config() -> Config {
             // 1 MHz PLL input * 240 = 240 MHz PLL VCO
             mul: unwrap!(PLLMul::try_from(240)),
             // 240 MHz PLL VCO / 2 = 120 MHz main PLL output
-            main_div: PLLMainDiv::Div2,
+            p_div: PLLPDiv::DIV2,
             // 240 MHz PLL VCO / 5 = 48 MHz PLL48 output
-            pll48_div: unwrap!(PLL48Div::try_from(5)),
+            q_div: PLLQDiv::DIV5,
         };
         // System clock comes from PLL (= the 120 MHz main PLL output)
         config.rcc.mux = ClockSrc::PLL;
@@ -239,10 +239,10 @@ pub fn config() -> Config {
         });
         config.rcc.pll1 = Some(Pll {
             source: PllSource::Hse,
-            prediv: 2,
-            mul: 125,
-            divp: Some(2),
-            divq: Some(2),
+            prediv: PllPreDiv::DIV2,
+            mul: PllMul::MUL125,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV2),
             divr: None,
         });
         config.rcc.ahb_pre = AHBPrescaler::DIV1;
@@ -261,16 +261,16 @@ pub fn config() -> Config {
         config.rcc.hsi48 = true; // needed for RNG
         config.rcc.pll_src = PllSource::Hsi;
         config.rcc.pll1 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(2),
-            divq: Some(8), // SPI1 cksel defaults to pll1_q
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: Some(PllDiv::DIV8), // SPI1 cksel defaults to pll1_q
             divr: None,
         });
         config.rcc.pll2 = Some(Pll {
-            prediv: 4,
-            mul: 50,
-            divp: Some(8), // 100mhz
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV8), // 100mhz
             divq: None,
             divr: None,
         });
@@ -290,10 +290,10 @@ pub fn config() -> Config {
         config.rcc.mux = ClockSrc::PLL(
             // 72Mhz clock (16 / 1 * 18 / 4)
             PLLSource::HSI16,
-            PLLClkDiv::Div4,
-            PLLSrcDiv::Div1,
-            PLLMul::Mul18,
-            Some(PLLClkDiv::Div6), // 48Mhz (16 / 1 * 18 / 6)
+            PllRDiv::DIV4,
+            PllPreDiv::DIV1,
+            PllMul::MUL18,
+            Some(PllQDiv::DIV6), // 48Mhz (16 / 1 * 18 / 6)
         );
     }
 
@@ -303,9 +303,9 @@ pub fn config() -> Config {
         config.rcc.mux = ClockSrc::PLL(
             // 110Mhz clock (16 / 4 * 55 / 2)
             PLLSource::HSI16,
-            PLLClkDiv::Div2,
-            PLLSrcDiv::Div4,
-            PLLMul::Mul55,
+            PllRDiv::DIV2,
+            PllPreDiv::DIV4,
+            PllMul::MUL55,
             None,
         );
     }
@@ -313,7 +313,7 @@ pub fn config() -> Config {
     #[cfg(feature = "stm32u585ai")]
     {
         use embassy_stm32::rcc::*;
-        config.rcc.mux = ClockSrc::MSI(MSIRange::Range48mhz);
+        config.rcc.mux = ClockSrc::MSI(Msirange::RANGE_48MHZ);
     }
 
     #[cfg(feature = "stm32l073rz")]