Merge pull request #1606 from JcBernack/rng-update

STM32: RNG update

embassy-stm32/Cargo.toml

@@ -57,7 +57,7 @@ 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 = "13"
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-1f8ab493e029fc601edebc6bac105a63cc9858fe" }
 vcell = "0.1.3"
 bxcan = "0.7.0"
 nb = "1.0.0"
@@ -75,7 +75,7 @@ critical-section = { version = "1.1", features = ["std"] }
 [build-dependencies]
 proc-macro2 = "1.0.36"
 quote = "1.0.15"
-stm32-metapac = { version = "13", default-features = false, features = ["metadata"]}
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-1f8ab493e029fc601edebc6bac105a63cc9858fe", default-features = false, features = ["metadata"]}
 
 [features]
 default = ["rt"]

embassy-stm32/src/rng.rs

@@ -1,15 +1,17 @@
 #![macro_use]
 
 use core::future::poll_fn;
+use core::marker::PhantomData;
 use core::task::Poll;
 
 use embassy_hal_internal::{into_ref, PeripheralRef};
 use embassy_sync::waitqueue::AtomicWaker;
 use rand_core::{CryptoRng, RngCore};
 
-use crate::{pac, peripherals, Peripheral};
+use crate::interrupt::typelevel::Interrupt;
+use crate::{interrupt, pac, peripherals, Peripheral};
 
-pub(crate) static RNG_WAKER: AtomicWaker = AtomicWaker::new();
+static RNG_WAKER: AtomicWaker = AtomicWaker::new();
 
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
@@ -17,68 +19,145 @@ pub enum Error {
     ClockError,
 }
 
+pub struct InterruptHandler<T: Instance> {
+    _phantom: PhantomData<T>,
+}
+
+impl<T: Instance> interrupt::typelevel::Handler<T::Interrupt> for InterruptHandler<T> {
+    unsafe fn on_interrupt() {
+        let bits = T::regs().sr().read();
+        if bits.drdy() || bits.seis() || bits.ceis() {
+            T::regs().cr().modify(|reg| reg.set_ie(false));
+            RNG_WAKER.wake();
+        }
+    }
+}
+
 pub struct Rng<'d, T: Instance> {
     _inner: PeripheralRef<'d, T>,
 }
 
 impl<'d, T: Instance> Rng<'d, T> {
-    pub fn new(inner: impl Peripheral<P = T> + 'd) -> Self {
+    pub fn new(
+        inner: impl Peripheral<P = T> + 'd,
+        _irq: impl interrupt::typelevel::Binding<T::Interrupt, InterruptHandler<T>> + 'd,
+    ) -> Self {
         T::enable();
         T::reset();
         into_ref!(inner);
         let mut random = Self { _inner: inner };
         random.reset();
+
+        T::Interrupt::unpend();
+        unsafe { T::Interrupt::enable() };
+
         random
     }
 
+    #[cfg(rng_v1)]
     pub fn reset(&mut self) {
-        // rng_v2 locks up on seed error, needs reset
+        T::regs().cr().write(|reg| {
-        #[cfg(rng_v2)]
+            reg.set_rngen(false);
-        if T::regs().sr().read().seis() {
-            T::reset();
-        }
-        T::regs().cr().modify(|reg| {
-            reg.set_rngen(true);
-            reg.set_ie(true);
         });
         T::regs().sr().modify(|reg| {
             reg.set_seis(false);
             reg.set_ceis(false);
         });
+        T::regs().cr().modify(|reg| {
+            reg.set_rngen(true);
+        });
         // Reference manual says to discard the first.
         let _ = self.next_u32();
     }
 
-    pub async fn async_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
+    #[cfg(not(rng_v1))]
+    pub fn reset(&mut self) {
+        T::regs().cr().write(|reg| {
+            reg.set_rngen(false);
+            reg.set_condrst(true);
+            // set RNG config "A" according to reference manual
+            // this has to be written within the same write access as setting the CONDRST bit
+            reg.set_nistc(pac::rng::vals::Nistc::DEFAULT);
+            reg.set_rng_config1(pac::rng::vals::RngConfig1::CONFIGA);
+            reg.set_rng_config2(pac::rng::vals::RngConfig2::CONFIGA_B);
+            reg.set_rng_config3(pac::rng::vals::RngConfig3::CONFIGA);
+            reg.set_clkdiv(pac::rng::vals::Clkdiv::NODIV);
+        });
+        // wait for CONDRST to be set
+        while !T::regs().cr().read().condrst() {}
+        // magic number must be written immediately before every read or write access to HTCR
+        T::regs().htcr().write(|w| w.set_htcfg(pac::rng::vals::Htcfg::MAGIC));
+        // write recommended value according to reference manual
+        // note: HTCR can only be written during conditioning
+        T::regs()
+            .htcr()
+            .write(|w| w.set_htcfg(pac::rng::vals::Htcfg::RECOMMENDED));
+        // finish conditioning
         T::regs().cr().modify(|reg| {
             reg.set_rngen(true);
+            reg.set_condrst(false);
         });
+        // wait for CONDRST to be reset
+        while T::regs().cr().read().condrst() {}
+    }
 
+    pub fn recover_seed_error(&mut self) -> () {
+        self.reset();
+        // reset should also clear the SEIS flag
+        if T::regs().sr().read().seis() {
+            warn!("recovering from seed error failed");
+            return;
+        }
+        // wait for SECS to be cleared by RNG
+        while T::regs().sr().read().secs() {}
+    }
+
+    pub async fn async_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
         for chunk in dest.chunks_mut(4) {
-            poll_fn(|cx| {
+            let bits = T::regs().sr().read();
-                RNG_WAKER.register(cx.waker());
+            if bits.seis() {
-                T::regs().cr().modify(|reg| {
+                // in case of noise-source or seed error we try to recover here
-                    reg.set_ie(true);
+                // but we must not use the data in DR and we return an error
-                });
+                // to leave retry-logic to the application
-
+                self.recover_seed_error();
-                let bits = T::regs().sr().read();
+                return Err(Error::SeedError);
-
+            } else if bits.ceis() {
-                if bits.drdy() {
+                // clock error detected, DR could still be used but keep it safe,
-                    Poll::Ready(Ok(()))
+                // clear the error and abort
-                } else if bits.seis() {
+                T::regs().sr().modify(|sr| sr.set_ceis(false));
-                    self.reset();
+                return Err(Error::ClockError);
-                    Poll::Ready(Err(Error::SeedError))
+            } else if bits.drdy() {
-                } else if bits.ceis() {
+                // DR can be read up to four times until the output buffer is empty
-                    self.reset();
+                // DRDY is cleared automatically when that happens
-                    Poll::Ready(Err(Error::ClockError))
+                let random_word = T::regs().dr().read();
-                } else {
+                // reference manual: always check if DR is zero
-                    Poll::Pending
+                if random_word == 0 {
+                    return Err(Error::SeedError);
                 }
-            })
+                // write bytes to chunk
-            .await?;
+                for (dest, src) in chunk.iter_mut().zip(random_word.to_be_bytes().iter()) {
-            let random_bytes = T::regs().dr().read().to_be_bytes();
+                    *dest = *src
-            for (dest, src) in chunk.iter_mut().zip(random_bytes.iter()) {
+                }
-                *dest = *src
+            } else {
+                // wait for interrupt
+                poll_fn(|cx| {
+                    // quick check to avoid registration if already done.
+                    let bits = T::regs().sr().read();
+                    if bits.drdy() || bits.seis() || bits.ceis() {
+                        return Poll::Ready(());
+                    }
+                    RNG_WAKER.register(cx.waker());
+                    T::regs().cr().modify(|reg| reg.set_ie(true));
+                    // Need to check condition **after** `register` to avoid a race
+                    // condition that would result in lost notifications.
+                    let bits = T::regs().sr().read();
+                    if bits.drdy() || bits.seis() || bits.ceis() {
+                        Poll::Ready(())
+                    } else {
+                        Poll::Pending
+                    }
+                })
+                .await;
             }
         }
 
@@ -129,57 +208,20 @@ pub(crate) mod sealed {
     }
 }
 
-pub trait Instance: sealed::Instance + crate::rcc::RccPeripheral {}
+pub trait Instance: sealed::Instance + Peripheral<P = Self> + crate::rcc::RccPeripheral + 'static + Send {
+    type Interrupt: interrupt::typelevel::Interrupt;
+}
 
-foreach_peripheral!(
+foreach_interrupt!(
-    (rng, $inst:ident) => {
+    ($inst:ident, rng, RNG, GLOBAL, $irq:ident) => {
-        impl Instance for peripherals::$inst {}
+        impl Instance for peripherals::$inst {
+            type Interrupt = crate::interrupt::typelevel::$irq;
+        }
 
         impl sealed::Instance for peripherals::$inst {
             fn regs() -> crate::pac::rng::Rng {
-                crate::pac::RNG
+                crate::pac::$inst
             }
         }
     };
 );
-
-#[cfg(feature = "rt")]
-macro_rules! irq {
-    ($irq:ident) => {
-        mod rng_irq {
-            use crate::interrupt;
-
-            #[interrupt]
-            unsafe fn $irq() {
-                let bits = $crate::pac::RNG.sr().read();
-                if bits.drdy() || bits.seis() || bits.ceis() {
-                    $crate::pac::RNG.cr().write(|reg| reg.set_ie(false));
-                    $crate::rng::RNG_WAKER.wake();
-                }
-            }
-        }
-    };
-}
-
-#[cfg(feature = "rt")]
-foreach_interrupt!(
-    (RNG) => {
-        irq!(RNG);
-    };
-
-    (RNG_LPUART1) => {
-        irq!(RNG_LPUART1);
-    };
-
-    (AES_RNG_LPUART1) => {
-        irq!(AES_RNG_LPUART1);
-    };
-
-    (AES_RNG) => {
-        irq!(AES_RNG);
-    };
-
-    (HASH_RNG) => {
-        irq!(HASH_RNG);
-    };
-);

examples/stm32f4/src/bin/eth.rs

@@ -11,13 +11,15 @@ use embassy_stm32::eth::{Ethernet, PacketQueue};
 use embassy_stm32::peripherals::ETH;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::mhz;
-use embassy_stm32::{bind_interrupts, eth, Config};
+use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
 use embassy_time::{Duration, Timer};
 use embedded_io::asynch::Write;
 use static_cell::make_static;
 use {defmt_rtt as _, panic_probe as _};
+
 bind_interrupts!(struct Irqs {
     ETH => eth::InterruptHandler;
+    HASH_RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 type Device = Ethernet<'static, ETH, GenericSMI>;
@@ -36,7 +38,7 @@ async fn main(spawner: Spawner) -> ! {
     info!("Hello World!");
 
     // Generate random seed.
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let mut seed = [0; 8];
     let _ = rng.async_fill_bytes(&mut seed).await;
     let seed = u64::from_le_bytes(seed);

examples/stm32f4/src/bin/usb_ethernet.rs

@@ -6,7 +6,7 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_net::tcp::TcpSocket;
 use embassy_net::{Stack, StackResources};
-use embassy_stm32::rng::Rng;
+use embassy_stm32::rng::{self, Rng};
 use embassy_stm32::time::mhz;
 use embassy_stm32::usb_otg::Driver;
 use embassy_stm32::{bind_interrupts, peripherals, usb_otg, Config};
@@ -38,6 +38,7 @@ async fn net_task(stack: &'static Stack<Device<'static, MTU>>) -> ! {
 
 bind_interrupts!(struct Irqs {
     OTG_FS => usb_otg::InterruptHandler<peripherals::USB_OTG_FS>;
+    HASH_RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 #[embassy_executor::main]
@@ -104,7 +105,7 @@ async fn main(spawner: Spawner) {
     //});
 
     // Generate random seed
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let mut seed = [0; 8];
     unwrap!(rng.async_fill_bytes(&mut seed).await);
     let seed = u64::from_le_bytes(seed);

examples/stm32f7/src/bin/eth.rs

@@ -11,14 +11,16 @@ use embassy_stm32::eth::{Ethernet, PacketQueue};
 use embassy_stm32::peripherals::ETH;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::mhz;
-use embassy_stm32::{bind_interrupts, eth, Config};
+use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
 use embassy_time::{Duration, Timer};
 use embedded_io::asynch::Write;
 use rand_core::RngCore;
 use static_cell::make_static;
 use {defmt_rtt as _, panic_probe as _};
+
 bind_interrupts!(struct Irqs {
     ETH => eth::InterruptHandler;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 type Device = Ethernet<'static, ETH, GenericSMI>;
@@ -37,7 +39,7 @@ async fn main(spawner: Spawner) -> ! {
     info!("Hello World!");
 
     // Generate random seed.
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let mut seed = [0; 8];
     rng.fill_bytes(&mut seed);
     let seed = u64::from_le_bytes(seed);

examples/stm32h5/src/bin/eth.rs

@@ -12,14 +12,16 @@ use embassy_stm32::peripherals::ETH;
 use embassy_stm32::rcc::{AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllSource, Sysclk, VoltageScale};
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::Hertz;
-use embassy_stm32::{bind_interrupts, eth, Config};
+use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
 use embassy_time::{Duration, Timer};
 use embedded_io::asynch::Write;
 use rand_core::RngCore;
 use static_cell::make_static;
 use {defmt_rtt as _, panic_probe as _};
+
 bind_interrupts!(struct Irqs {
     ETH => eth::InterruptHandler;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 type Device = Ethernet<'static, ETH, GenericSMI>;
@@ -56,7 +58,7 @@ async fn main(spawner: Spawner) -> ! {
     info!("Hello World!");
 
     // Generate random seed.
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let mut seed = [0; 8];
     rng.fill_bytes(&mut seed);
     let seed = u64::from_le_bytes(seed);

examples/stm32h5/src/bin/rng.rs

@@ -5,14 +5,19 @@
 use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::rng::Rng;
+use embassy_stm32::{bind_interrupts, peripherals, rng};
 use {defmt_rtt as _, panic_probe as _};
 
+bind_interrupts!(struct Irqs {
+    RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let p = embassy_stm32::init(Default::default());
     info!("Hello World!");
 
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
 
     let mut buf = [0u8; 16];
     unwrap!(rng.async_fill_bytes(&mut buf).await);

examples/stm32h7/src/bin/eth.rs

@@ -11,14 +11,16 @@ use embassy_stm32::eth::{Ethernet, PacketQueue};
 use embassy_stm32::peripherals::ETH;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::mhz;
-use embassy_stm32::{bind_interrupts, eth, Config};
+use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
 use embassy_time::{Duration, Timer};
 use embedded_io::asynch::Write;
 use rand_core::RngCore;
 use static_cell::make_static;
 use {defmt_rtt as _, panic_probe as _};
+
 bind_interrupts!(struct Irqs {
     ETH => eth::InterruptHandler;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 type Device = Ethernet<'static, ETH, GenericSMI>;
@@ -38,7 +40,7 @@ async fn main(spawner: Spawner) -> ! {
     info!("Hello World!");
 
     // Generate random seed.
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let mut seed = [0; 8];
     rng.fill_bytes(&mut seed);
     let seed = u64::from_le_bytes(seed);

examples/stm32h7/src/bin/eth_client.rs

@@ -11,15 +11,17 @@ use embassy_stm32::eth::{Ethernet, PacketQueue};
 use embassy_stm32::peripherals::ETH;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::time::mhz;
-use embassy_stm32::{bind_interrupts, eth, Config};
+use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
 use embassy_time::{Duration, Timer};
 use embedded_io::asynch::Write;
 use embedded_nal_async::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpConnect};
 use rand_core::RngCore;
 use static_cell::make_static;
 use {defmt_rtt as _, panic_probe as _};
+
 bind_interrupts!(struct Irqs {
     ETH => eth::InterruptHandler;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 type Device = Ethernet<'static, ETH, GenericSMI>;
@@ -39,7 +41,7 @@ async fn main(spawner: Spawner) -> ! {
     info!("Hello World!");
 
     // Generate random seed.
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let mut seed = [0; 8];
     rng.fill_bytes(&mut seed);
     let seed = u64::from_le_bytes(seed);

examples/stm32h7/src/bin/rng.rs

@@ -5,14 +5,19 @@
 use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::rng::Rng;
+use embassy_stm32::{bind_interrupts, peripherals, rng};
 use {defmt_rtt as _, panic_probe as _};
 
+bind_interrupts!(struct Irqs {
+    RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let p = embassy_stm32::init(Default::default());
     info!("Hello World!");
 
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
 
     let mut buf = [0u8; 16];
     unwrap!(rng.async_fill_bytes(&mut buf).await);

examples/stm32l0/src/bin/lora_lorawan.rs

@@ -12,8 +12,8 @@ use embassy_lora::LoraTimer;
 use embassy_stm32::exti::{Channel, ExtiInput};
 use embassy_stm32::gpio::{Input, Level, Output, Pin, Pull, Speed};
 use embassy_stm32::rng::Rng;
-use embassy_stm32::spi;
 use embassy_stm32::time::khz;
+use embassy_stm32::{bind_interrupts, peripherals, rng, spi};
 use embassy_time::Delay;
 use lora_phy::mod_params::*;
 use lora_phy::sx1276_7_8_9::SX1276_7_8_9;
@@ -23,6 +23,10 @@ use lorawan_device::async_device::lora_radio::LoRaRadio;
 use lorawan_device::async_device::{region, Device, JoinMode};
 use {defmt_rtt as _, panic_probe as _};
 
+bind_interrupts!(struct Irqs {
+    RNG_LPUART1 => rng::InterruptHandler<peripherals::RNG>;
+});
+
 const LORAWAN_REGION: region::Region = region::Region::EU868; // warning: set this appropriately for the region
 
 #[embassy_executor::main]
@@ -60,7 +64,7 @@ async fn main(_spawner: Spawner) {
 
     let radio = LoRaRadio::new(lora);
     let region: region::Configuration = region::Configuration::new(LORAWAN_REGION);
-    let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG));
+    let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG, Irqs));
 
     defmt::info!("Joining LoRaWAN network");
 

examples/stm32l4/src/bin/rng.rs

@@ -6,9 +6,13 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv};
 use embassy_stm32::rng::Rng;
-use embassy_stm32::Config;
+use embassy_stm32::{bind_interrupts, peripherals, rng, Config};
 use {defmt_rtt as _, panic_probe as _};
 
+bind_interrupts!(struct Irqs {
+    RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = Config::default();
@@ -24,7 +28,7 @@ async fn main(_spawner: Spawner) {
 
     info!("Hello World!");
 
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
 
     let mut buf = [0u8; 16];
     unwrap!(rng.async_fill_bytes(&mut buf).await);

examples/stm32l5/src/bin/rng.rs

@@ -6,9 +6,13 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv};
 use embassy_stm32::rng::Rng;
-use embassy_stm32::Config;
+use embassy_stm32::{bind_interrupts, peripherals, rng, Config};
 use {defmt_rtt as _, panic_probe as _};
 
+bind_interrupts!(struct Irqs {
+    RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = Config::default();
@@ -23,7 +27,7 @@ async fn main(_spawner: Spawner) {
 
     info!("Hello World!");
 
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
 
     let mut buf = [0u8; 16];
     unwrap!(rng.async_fill_bytes(&mut buf).await);

examples/stm32l5/src/bin/usb_ethernet.rs

@@ -9,7 +9,7 @@ use embassy_net::{Stack, StackResources};
 use embassy_stm32::rcc::*;
 use embassy_stm32::rng::Rng;
 use embassy_stm32::usb::Driver;
-use embassy_stm32::{bind_interrupts, peripherals, usb, Config};
+use embassy_stm32::{bind_interrupts, peripherals, rng, usb, Config};
 use embassy_usb::class::cdc_ncm::embassy_net::{Device, Runner, State as NetState};
 use embassy_usb::class::cdc_ncm::{CdcNcmClass, State};
 use embassy_usb::{Builder, UsbDevice};
@@ -24,6 +24,7 @@ const MTU: usize = 1514;
 
 bind_interrupts!(struct Irqs {
     USB_FS => usb::InterruptHandler<peripherals::USB>;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 #[embassy_executor::task]
@@ -99,7 +100,7 @@ async fn main(spawner: Spawner) {
     //});
 
     // Generate random seed
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
     let seed = rng.next_u64();
 
     // Init network stack

examples/stm32wl/src/bin/lora_lorawan.rs

@@ -10,9 +10,9 @@ use embassy_executor::Spawner;
 use embassy_lora::iv::{InterruptHandler, Stm32wlInterfaceVariant};
 use embassy_lora::LoraTimer;
 use embassy_stm32::gpio::{Level, Output, Pin, Speed};
-use embassy_stm32::rng::Rng;
+use embassy_stm32::rng::{self, Rng};
 use embassy_stm32::spi::Spi;
-use embassy_stm32::{bind_interrupts, pac};
+use embassy_stm32::{bind_interrupts, pac, peripherals};
 use embassy_time::Delay;
 use lora_phy::mod_params::*;
 use lora_phy::sx1261_2::SX1261_2;
@@ -26,6 +26,7 @@ const LORAWAN_REGION: region::Region = region::Region::EU868; // warning: set th
 
 bind_interrupts!(struct Irqs{
     SUBGHZ_RADIO => InterruptHandler;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
 });
 
 #[embassy_executor::main]
@@ -58,7 +59,7 @@ async fn main(_spawner: Spawner) {
     };
     let radio = LoRaRadio::new(lora);
     let region: region::Configuration = region::Configuration::new(LORAWAN_REGION);
-    let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG));
+    let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG, Irqs));
 
     defmt::info!("Joining LoRaWAN network");
 

examples/stm32wl/src/bin/random.rs

@@ -4,10 +4,14 @@
 
 use defmt::*;
 use embassy_executor::Spawner;
-use embassy_stm32::pac;
+use embassy_stm32::rng::{self, Rng};
-use embassy_stm32::rng::Rng;
+use embassy_stm32::{bind_interrupts, pac, peripherals};
 use {defmt_rtt as _, panic_probe as _};
 
+bind_interrupts!(struct Irqs{
+    RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = embassy_stm32::Config::default();
@@ -21,7 +25,7 @@ async fn main(_spawner: Spawner) {
 
     info!("Hello World!");
 
-    let mut rng = Rng::new(p.RNG);
+    let mut rng = Rng::new(p.RNG, Irqs);
 
     let mut buf = [0u8; 16];
     unwrap!(rng.async_fill_bytes(&mut buf).await);