stm32: add stm32wba support.

ci.sh

@@ -145,6 +145,7 @@ cargo batch  \
     --- build --release --manifest-path examples/stm32l5/Cargo.toml --target thumbv8m.main-none-eabihf --out-dir out/examples/stm32l5 \
     --- build --release --manifest-path examples/stm32u5/Cargo.toml --target thumbv8m.main-none-eabihf --out-dir out/examples/stm32u5 \
     --- build --release --manifest-path examples/stm32wb/Cargo.toml --target thumbv7em-none-eabihf --out-dir out/examples/stm32wb \
+    --- build --release --manifest-path examples/stm32wba/Cargo.toml --target thumbv8m.main-none-eabihf --out-dir out/examples/stm32wba \
     --- build --release --manifest-path examples/stm32wl/Cargo.toml --target thumbv7em-none-eabihf --out-dir out/examples/stm32wl \
     --- build --release --manifest-path examples/boot/application/nrf/Cargo.toml --target thumbv7em-none-eabi --features embassy-nrf/nrf52840,skip-include --out-dir out/examples/boot/nrf52840  \
     --- build --release --manifest-path examples/boot/application/nrf/Cargo.toml --target thumbv8m.main-none-eabihf --features embassy-nrf/nrf9160-ns,skip-include --out-dir out/examples/boot/nrf9160 \

embassy-stm32/Cargo.toml

@@ -27,6 +27,7 @@ flavors = [
     { regex_feature = "stm32l5.*", target = "thumbv8m.main-none-eabihf" },
     { regex_feature = "stm32u5.*", target = "thumbv8m.main-none-eabihf" },
     { regex_feature = "stm32wb.*", target = "thumbv7em-none-eabi" },
+    { regex_feature = "stm32wba.*", target = "thumbv8m.main-none-eabihf" },
     { regex_feature = "stm32wl.*", target = "thumbv7em-none-eabi" },
 ]
 
@@ -58,7 +59,7 @@ 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 = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-4d58d2d6648d526feb6bc45748dc73a05d41a5f3" }
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-546aead07086342605102d66dec49c5e2d459a0c" }
 vcell = "0.1.3"
 bxcan = "0.7.0"
 nb = "1.0.0"
@@ -77,7 +78,7 @@ 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-4d58d2d6648d526feb6bc45748dc73a05d41a5f3", default-features = false, features = ["metadata"]}
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-546aead07086342605102d66dec49c5e2d459a0c", default-features = false, features = ["metadata"]}
 
 [features]
 default = ["rt"]
@@ -1454,6 +1455,10 @@ stm32wb55vc = [ "stm32-metapac/stm32wb55vc" ]
 stm32wb55ve = [ "stm32-metapac/stm32wb55ve" ]
 stm32wb55vg = [ "stm32-metapac/stm32wb55vg" ]
 stm32wb55vy = [ "stm32-metapac/stm32wb55vy" ]
+stm32wba52ce = [ "stm32-metapac/stm32wba52ce" ]
+stm32wba52cg = [ "stm32-metapac/stm32wba52cg" ]
+stm32wba52ke = [ "stm32-metapac/stm32wba52ke" ]
+stm32wba52kg = [ "stm32-metapac/stm32wba52kg" ]
 stm32wl54cc-cm4 = [ "stm32-metapac/stm32wl54cc-cm4" ]
 stm32wl54cc-cm0p = [ "stm32-metapac/stm32wl54cc-cm0p" ]
 stm32wl54jc-cm4 = [ "stm32-metapac/stm32wl54jc-cm4" ]

embassy-stm32/build.rs

@@ -1005,10 +1005,15 @@ fn main() {
     // =======
     // Features for targeting groups of chips
 
+    if &chip_name[..8] == "stm32wba" {
+        println!("cargo:rustc-cfg={}", &chip_name[..8]); // stm32wba
+        println!("cargo:rustc-cfg={}", &chip_name[..10]); // stm32wba52
+    } else {
         println!("cargo:rustc-cfg={}", &chip_name[..7]); // stm32f4
         println!("cargo:rustc-cfg={}", &chip_name[..9]); // stm32f429
         println!("cargo:rustc-cfg={}x", &chip_name[..8]); // stm32f42x
         println!("cargo:rustc-cfg={}x{}", &chip_name[..7], &chip_name[8..9]); // stm32f4x9
+    }
 
     // Handle time-driver-XXXX features.
     if env::var("CARGO_FEATURE_TIME_DRIVER_ANY").is_ok() {}

embassy-stm32/src/lib.rs

@@ -154,7 +154,7 @@ pub fn init(config: Config) -> Peripherals {
     #[cfg(dbgmcu)]
     if config.enable_debug_during_sleep {
         crate::pac::DBGMCU.cr().modify(|cr| {
-            #[cfg(any(dbgmcu_f0, dbgmcu_c0, dbgmcu_g0, dbgmcu_u5))]
+            #[cfg(any(dbgmcu_f0, dbgmcu_c0, dbgmcu_g0, dbgmcu_u5, dbgmcu_wba))]
             {
                 cr.set_dbg_stop(true);
                 cr.set_dbg_standby(true);

embassy-stm32/src/rcc/bd.rs

@@ -26,19 +26,7 @@ impl From<LseDrive> for crate::pac::rcc::vals::Lsedrv {
     }
 }
 
-#[allow(dead_code)]
+pub use crate::pac::rcc::vals::Rtcsel as RtcClockSource;
-#[derive(Copy, Clone, Debug, PartialEq)]
-#[repr(u8)]
-pub enum RtcClockSource {
-    /// 00: No clock
-    NoClock = 0b00,
-    /// 01: LSE oscillator clock used as RTC clock
-    LSE = 0b01,
-    /// 10: LSI oscillator clock used as RTC clock
-    LSI = 0b10,
-    /// 11: HSE oscillator clock divided by 32 used as RTC clock
-    HSE = 0b11,
-}
 
 #[cfg(not(any(rtc_v2l0, rtc_v2l1, stm32c0)))]
 #[allow(dead_code)]
@@ -109,17 +97,17 @@ impl BackupDomain {
                 let csr = crate::pac::RCC.csr();
 
                 Self::modify(|_| {
-                    #[cfg(not(rtc_v2wb))]
+                    #[cfg(not(any(rcc_wb, rcc_wba)))]
                     csr.modify(|w| w.set_lsion(true));
 
-                    #[cfg(rtc_v2wb)]
+                    #[cfg(any(rcc_wb, rcc_wba))]
                     csr.modify(|w| w.set_lsi1on(true));
                 });
 
-                #[cfg(not(rtc_v2wb))]
+                #[cfg(not(any(rcc_wb, rcc_wba)))]
                 while !csr.read().lsirdy() {}
 
-                #[cfg(rtc_v2wb)]
+                #[cfg(any(rcc_wb, rcc_wba))]
                 while !csr.read().lsi1rdy() {}
             }
             RtcClockSource::LSE => {
@@ -136,51 +124,36 @@ impl BackupDomain {
             _ => {}
         };
 
-        Self::configure_rtc(clock_source);
+        if clock_source == RtcClockSource::NOCLOCK {
-    }
+            // disable it
-
-    #[cfg(any(
-        rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb, rtc_v3,
-        rtc_v3u5
-    ))]
-    #[allow(dead_code, unused_variables)]
-    pub fn configure_rtc(clock_source: RtcClockSource) {
-        let clock_source = clock_source as u8;
-        #[cfg(any(
-            not(any(rtc_v3, rtc_v3u5, rtc_v2wb)),
-            all(any(rtc_v3, rtc_v3u5), not(any(rcc_wl5, rcc_wle)))
-        ))]
-        let clock_source = crate::pac::rcc::vals::Rtcsel::from_bits(clock_source);
-
-        #[cfg(not(rtc_v2wb))]
             Self::modify(|w| {
-            // Select RTC source
+                #[cfg(not(rcc_wba))]
+                w.set_rtcen(false);
                 w.set_rtcsel(clock_source);
             });
-    }
+        } else {
-
+            // check if it's already enabled and in the source we want.
-    #[cfg(any(
-        rtc_v2f0, rtc_v2f2, rtc_v2f3, rtc_v2f4, rtc_v2f7, rtc_v2h7, rtc_v2l0, rtc_v2l1, rtc_v2l4, rtc_v2wb, rtc_v3,
-        rtc_v3u5
-    ))]
-    #[allow(dead_code)]
-    pub fn enable_rtc() {
             let reg = Self::read();
+            let ok = reg.rtcsel() == clock_source;
+            #[cfg(not(rcc_wba))]
+            let ok = ok & reg.rtcen();
 
+            // if not, configure it.
+            if !ok {
                 #[cfg(any(rtc_v2h7, rtc_v2l4, rtc_v2wb, rtc_v3, rtc_v3u5))]
                 assert!(!reg.lsecsson(), "RTC is not compatible with LSE CSS, yet.");
 
-        if !reg.rtcen() {
+                #[cfg(not(any(rcc_l0, rcc_l1)))]
-            #[cfg(not(any(rtc_v2l0, rtc_v2l1, rtc_v2f2)))]
                 Self::modify(|w| w.set_bdrst(true));
 
                 Self::modify(|w| {
                     // Reset
-                #[cfg(not(any(rtc_v2l0, rtc_v2l1, rtc_v2f2)))]
+                    #[cfg(not(any(rcc_l0, rcc_l1)))]
                     w.set_bdrst(false);
 
+                    #[cfg(not(rcc_wba))]
                     w.set_rtcen(true);
-                w.set_rtcsel(reg.rtcsel());
+                    w.set_rtcsel(clock_source);
 
                     // Restore bcdr
                     #[cfg(any(rtc_v2l4, rtc_v2wb, rtc_v3, rtc_v3u5))]
@@ -197,3 +170,4 @@ impl BackupDomain {
             }
         }
     }
+}

embassy-stm32/src/rcc/bus.rs

@@ -79,10 +79,7 @@ impl From<AHBPrescaler> for rcc::vals::Hpre {
         use rcc::vals::Hpre;
 
         match val {
-            #[cfg(not(rcc_u5))]
             AHBPrescaler::NotDivided => Hpre::DIV1,
-            #[cfg(rcc_u5)]
-            AHBPrescaler::NotDivided => Hpre::NONE,
             AHBPrescaler::Div2 => Hpre::DIV2,
             AHBPrescaler::Div4 => Hpre::DIV4,
             AHBPrescaler::Div8 => Hpre::DIV8,
@@ -148,10 +145,7 @@ impl From<APBPrescaler> for rcc::vals::Ppre {
         use rcc::vals::Ppre;
 
         match val {
-            #[cfg(not(rcc_u5))]
             APBPrescaler::NotDivided => Ppre::DIV1,
-            #[cfg(rcc_u5)]
-            APBPrescaler::NotDivided => Ppre::NONE,
             APBPrescaler::Div2 => Ppre::DIV2,
             APBPrescaler::Div4 => Ppre::DIV4,
             APBPrescaler::Div8 => Ppre::DIV8,

embassy-stm32/src/rcc/mod.rs

@@ -1,6 +1,7 @@
 #![macro_use]
 
 pub(crate) mod bd;
+#[cfg(not(rcc_wba))]
 pub mod bus;
 use core::mem::MaybeUninit;
 
@@ -23,6 +24,7 @@ use crate::time::Hertz;
 #[cfg_attr(rcc_l5, path = "l5.rs")]
 #[cfg_attr(rcc_u5, path = "u5.rs")]
 #[cfg_attr(rcc_wb, path = "wb.rs")]
+#[cfg_attr(rcc_wba, path = "wba.rs")]
 #[cfg_attr(any(rcc_wl5, rcc_wle), path = "wl.rs")]
 #[cfg_attr(any(rcc_h5, rcc_h50), path = "h5.rs")]
 mod _version;
@@ -46,12 +48,14 @@ pub struct Clocks {
     pub apb3: Hertz,
     #[cfg(any(rcc_h7, rcc_h7ab))]
     pub apb4: Hertz,
+    #[cfg(any(rcc_wba))]
+    pub apb7: Hertz,
 
     // AHB
     pub ahb1: Hertz,
     #[cfg(any(
         rcc_l4, rcc_l5, rcc_f2, rcc_f4, rcc_f410, rcc_f7, rcc_h5, rcc_h50, rcc_h7, rcc_h7ab, rcc_g4, rcc_u5, rcc_wb,
-        rcc_wl5, rcc_wle
+        rcc_wba, rcc_wl5, rcc_wle
     ))]
     pub ahb2: Hertz,
     #[cfg(any(
@@ -59,7 +63,7 @@ pub struct Clocks {
         rcc_wle
     ))]
     pub ahb3: Hertz,
-    #[cfg(any(rcc_h5, rcc_h50, rcc_h7, rcc_h7ab))]
+    #[cfg(any(rcc_h5, rcc_h50, rcc_h7, rcc_h7ab, rcc_wba))]
     pub ahb4: Hertz,
 
     #[cfg(any(rcc_f2, rcc_f4, rcc_f410, rcc_f7))]

embassy-stm32/src/rcc/u5.rs

@@ -165,7 +165,7 @@ impl Into<Sw> for ClockSrc {
             ClockSrc::MSI(..) => Sw::MSIS,
             ClockSrc::HSE(..) => Sw::HSE,
             ClockSrc::HSI16 => Sw::HSI16,
-            ClockSrc::PLL1R(..) => Sw::PLL1R,
+            ClockSrc::PLL1R(..) => Sw::PLL1_R,
         }
     }
 }

embassy-stm32/src/rcc/wba.rs

@@ -0,0 +1,184 @@
+use stm32_metapac::rcc::vals::{Pllsrc, Sw};
+
+use crate::pac::{FLASH, RCC};
+use crate::rcc::{set_freqs, Clocks};
+use crate::time::Hertz;
+
+/// HSI speed
+pub const HSI_FREQ: Hertz = Hertz(16_000_000);
+
+/// LSI speed
+pub const LSI_FREQ: Hertz = Hertz(32_000);
+
+pub use crate::pac::pwr::vals::Vos as VoltageScale;
+pub use crate::pac::rcc::vals::{Hpre as AHBPrescaler, Ppre as APBPrescaler};
+
+#[derive(Copy, Clone)]
+pub enum ClockSrc {
+    HSE(Hertz),
+    HSI16,
+}
+
+#[derive(Clone, Copy, Debug)]
+pub enum PllSrc {
+    HSE(Hertz),
+    HSI16,
+}
+
+impl Into<Pllsrc> for PllSrc {
+    fn into(self) -> Pllsrc {
+        match self {
+            PllSrc::HSE(..) => Pllsrc::HSE32,
+            PllSrc::HSI16 => Pllsrc::HSI16,
+        }
+    }
+}
+
+impl Into<Sw> for ClockSrc {
+    fn into(self) -> Sw {
+        match self {
+            ClockSrc::HSE(..) => Sw::HSE32,
+            ClockSrc::HSI16 => Sw::HSI16,
+        }
+    }
+}
+
+trait Div {
+    fn div(&self) -> u8;
+}
+
+impl Div for APBPrescaler {
+    fn div(&self) -> u8 {
+        match self {
+            Self::DIV1 => 1,
+            Self::DIV2 => 2,
+            Self::DIV4 => 4,
+            Self::DIV8 => 8,
+            Self::DIV16 => 16,
+            _ => unreachable!(),
+        }
+    }
+}
+
+impl Div for AHBPrescaler {
+    fn div(&self) -> u8 {
+        match self {
+            Self::DIV1 => 1,
+            Self::DIV2 => 2,
+            Self::DIV4 => 4,
+            Self::DIV8 => 8,
+            Self::DIV16 => 16,
+            _ => unreachable!(),
+        }
+    }
+}
+
+#[derive(Copy, Clone)]
+pub struct Config {
+    pub mux: ClockSrc,
+    pub ahb_pre: AHBPrescaler,
+    pub apb1_pre: APBPrescaler,
+    pub apb2_pre: APBPrescaler,
+    pub apb7_pre: APBPrescaler,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            mux: ClockSrc::HSI16,
+            ahb_pre: AHBPrescaler::DIV1,
+            apb1_pre: APBPrescaler::DIV1,
+            apb2_pre: APBPrescaler::DIV1,
+            apb7_pre: APBPrescaler::DIV1,
+        }
+    }
+}
+
+pub(crate) unsafe fn init(config: Config) {
+    let sys_clk = match config.mux {
+        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
+        }
+    };
+
+    // TODO make configurable
+    let power_vos = VoltageScale::RANGE1;
+
+    // states and programming delay
+    let wait_states = match power_vos {
+        VoltageScale::RANGE1 => match sys_clk {
+            ..=32_000_000 => 0,
+            ..=64_000_000 => 1,
+            ..=96_000_000 => 2,
+            ..=100_000_000 => 3,
+            _ => 4,
+        },
+        VoltageScale::RANGE2 => match sys_clk {
+            ..=8_000_000 => 0,
+            ..=16_000_000 => 1,
+            _ => 2,
+        },
+    };
+
+    FLASH.acr().modify(|w| {
+        w.set_latency(wait_states);
+    });
+
+    RCC.cfgr1().modify(|w| {
+        w.set_sw(config.mux.into());
+    });
+
+    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());
+    });
+
+    RCC.cfgr3().modify(|w| {
+        w.set_ppre7(config.apb7_pre.into());
+    });
+
+    let ahb_freq: u32 = sys_clk / config.ahb_pre.div() as u32;
+    let (apb1_freq, apb1_tim_freq) = match config.apb1_pre.div() {
+        1 => (ahb_freq, ahb_freq),
+        div => {
+            let freq = ahb_freq / div as u32;
+            (freq, freq * 2)
+        }
+    };
+    let (apb2_freq, apb2_tim_freq) = match config.apb2_pre.div() {
+        1 => (ahb_freq, ahb_freq),
+        div => {
+            let freq = ahb_freq / div as u32;
+            (freq, freq * 2)
+        }
+    };
+    let (apb7_freq, _apb7_tim_freq) = match config.apb7_pre.div() {
+        1 => (ahb_freq, ahb_freq),
+        div => {
+            let freq = ahb_freq / div as u32;
+            (freq, freq * 2)
+        }
+    };
+
+    set_freqs(Clocks {
+        sys: Hertz(sys_clk),
+        ahb1: Hertz(ahb_freq),
+        ahb2: Hertz(ahb_freq),
+        ahb4: Hertz(ahb_freq),
+        apb1: Hertz(apb1_freq),
+        apb2: Hertz(apb2_freq),
+        apb7: Hertz(apb7_freq),
+        apb1_tim: Hertz(apb1_tim_freq),
+        apb2_tim: Hertz(apb2_tim_freq),
+    });
+}

embassy-stm32/src/rtc/mod.rs

@@ -10,7 +10,6 @@ use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_sync::blocking_mutex::Mutex;
 
 pub use self::datetime::{DateTime, DayOfWeek, Error as DateTimeError};
-use crate::rcc::bd::BackupDomain;
 pub use crate::rcc::RtcClockSource;
 use crate::time::Hertz;
 
@@ -125,7 +124,6 @@ impl Default for RtcCalibrationCyclePeriod {
 impl Rtc {
     pub fn new(_rtc: impl Peripheral<P = RTC>, rtc_config: RtcConfig) -> Self {
         RTC::enable_peripheral_clk();
-        BackupDomain::enable_rtc();
 
         let mut this = Self {
             #[cfg(feature = "low-power")]

examples/stm32wba/.cargo/config.toml

@@ -0,0 +1,8 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip STM32WBA52CGUxT"
+
+[build]
+target = "thumbv8m.main-none-eabihf"
+
+[env]
+DEFMT_LOG = "trace"

examples/stm32wba/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+edition = "2021"
+name = "embassy-stm32wba-examples"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["nightly", "defmt", "stm32wba52cg", "time-driver-any", "memory-x", "exti"]  }
+embassy-sync = { version = "0.3.0", path = "../../embassy-sync", features = ["defmt"] }
+embassy-executor = { version = "0.3.0", path = "../../embassy-executor", features = ["nightly", "arch-cortex-m", "executor-thread", "defmt", "integrated-timers"] }
+embassy-time = { version = "0.1.3", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime", "tick-hz-32_768"] }
+embassy-net = { version = "0.1.0", path = "../../embassy-net", features = ["defmt", "udp", "proto-ipv6", "medium-ieee802154", "nightly"], optional=true }
+
+defmt = "0.3"
+defmt-rtt = "0.4"
+
+cortex-m = { version = "0.7.6", features = ["inline-asm", "critical-section-single-core"] }
+cortex-m-rt = "0.7.0"
+embedded-hal = "0.2.6"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
+heapless = { version = "0.7.5", default-features = false }
+static_cell = { version = "1.1", features = ["nightly"]}
+
+[profile.release]
+debug = 2

examples/stm32wba/build.rs

@@ -0,0 +1,10 @@
+use std::error::Error;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    println!("cargo:rerun-if-changed=link.x");
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+
+    Ok(())
+}

examples/stm32wba/src/bin/blinky.rs

@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_time::{Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello World!");
+
+    let mut led = Output::new(p.PB4, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after(Duration::from_millis(500)).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after(Duration::from_millis(500)).await;
+    }
+}

examples/stm32wba/src/bin/button_exti.rs

@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::gpio::{Input, Pull};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello World!");
+
+    let button = Input::new(p.PC13, Pull::Up);
+    let mut button = ExtiInput::new(button, p.EXTI13);
+
+    info!("Press the USER button...");
+
+    loop {
+        button.wait_for_falling_edge().await;
+        info!("Pressed!");
+        button.wait_for_rising_edge().await;
+        info!("Released!");
+    }
+}