Add examples for STM32L0

examples/stm32l0/src/bin/blinky.rs

@@ -0,0 +1,36 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy_stm32::{rcc::*, gpio::{Level, Output}};
+use embedded_hal::digital::v2::OutputPin;
+use example_common::*;
+
+use cortex_m_rt::entry;
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let mut p = embassy_stm32::init(Default::default());
+
+    Rcc::new(p.RCC).enable_debug_wfe(&mut p.DBGMCU, true);
+
+    let mut led = Output::new(p.PB5, Level::High);
+
+    loop {
+        info!("high");
+        led.set_high().unwrap();
+        cortex_m::asm::delay(1_000_000);
+
+        info!("low");
+        led.set_low().unwrap();
+        cortex_m::asm::delay(1_000_000);
+    }
+}

examples/stm32l0/src/bin/button.rs

@@ -0,0 +1,40 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy_stm32::{rcc::*, gpio::{Input, Level, Output, Pull}};
+use embedded_hal::digital::v2::{InputPin, OutputPin};
+use example_common::*;
+
+use cortex_m_rt::entry;
+
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let mut p = embassy_stm32::init(Default::default());
+    Rcc::new(p.RCC).enable_debug_wfe(&mut p.DBGMCU, true);
+
+    let button = Input::new(p.PB2, Pull::Up);
+    let mut led1 = Output::new(p.PA5, Level::High);
+    let mut led2 = Output::new(p.PB5, Level::High);
+
+    loop {
+        if button.is_high().unwrap() {
+            info!("high");
+            led1.set_high().unwrap();
+            led2.set_low().unwrap();
+        } else {
+            info!("low");
+            led1.set_low().unwrap();
+            led2.set_high().unwrap();
+        }
+    }
+}

examples/stm32l0/src/bin/button_exti.rs

@@ -0,0 +1,64 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy::executor::Executor;
+use embassy::time::Clock;
+use embassy::util::Forever;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::gpio::{Input, Pull};
+use embassy_stm32::rcc;
+use embassy_traits::gpio::{WaitForFallingEdge, WaitForRisingEdge};
+use example_common::*;
+
+use cortex_m_rt::entry;
+
+#[embassy::task]
+async fn main_task() {
+    let mut p = embassy_stm32::init(Default::default());
+    let mut rcc = rcc::Rcc::new(p.RCC);
+    rcc.enable_debug_wfe(&mut p.DBGMCU, true);
+    // Enables SYSCFG
+    let _ = rcc.enable_hsi48(&mut p.SYSCFG, p.CRS);
+
+    let button = Input::new(p.PB2, Pull::Up);
+    let mut button = ExtiInput::new(button, p.EXTI2);
+
+    info!("Press the USER button...");
+
+    loop {
+        button.wait_for_falling_edge().await;
+        info!("Pressed!");
+        button.wait_for_rising_edge().await;
+        info!("Released!");
+    }
+}
+
+struct ZeroClock;
+
+impl Clock for ZeroClock {
+    fn now(&self) -> u64 {
+        0
+    }
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    unsafe { embassy::time::set_clock(&ZeroClock) };
+
+    let executor = EXECUTOR.put(Executor::new());
+
+    executor.run(|spawner| {
+        unwrap!(spawner.spawn(main_task()));
+    })
+}

examples/stm32l0/src/bin/spi.rs

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+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use embassy_stm32::gpio::{Level, Output};
+use embedded_hal::digital::v2::OutputPin;
+use example_common::*;
+
+use cortex_m_rt::entry;
+use embassy_stm32::rcc;
+use embassy_stm32::spi::{Config, Spi};
+use embassy_stm32::time::Hertz;
+use embedded_hal::blocking::spi::Transfer;
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World, dude!");
+
+    let mut p = embassy_stm32::init(Default::default());
+    let mut rcc = rcc::Rcc::new(p.RCC);
+    rcc.enable_debug_wfe(&mut p.DBGMCU, true);
+
+    let mut spi = Spi::new(
+        Hertz(16_000_000),
+        p.SPI1,
+        p.PB3,
+        p.PA7,
+        p.PA6,
+        Hertz(1_000_000),
+        Config::default(),
+    );
+
+    let mut cs = Output::new(p.PA15, Level::High);
+
+    loop {
+        let mut buf = [0x0A; 4];
+        unwrap!(cs.set_low());
+        unwrap!(spi.transfer(&mut buf));
+        unwrap!(cs.set_high());
+        info!("xfer {=[u8]:x}", buf);
+    }
+}

examples/stm32l0/src/example_common.rs

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+#![macro_use]
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+pub use defmt::*;
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+
+defmt::timestamp! {"{=u64}", {
+        static COUNT: AtomicUsize = AtomicUsize::new(0);
+        // NOTE(no-CAS) `timestamps` runs with interrupts disabled
+        let n = COUNT.load(Ordering::Relaxed);
+        COUNT.store(n + 1, Ordering::Relaxed);
+        n as u64
+    }
+}