stm32: add exti

embassy-stm32-examples/src/bin/button_exti.rs

@@ -0,0 +1,129 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy::executor::Executor;
+use embassy::time::Clock;
+use embassy::util::Forever;
+use embassy_stm32::exti::{self, ExtiInput};
+use embassy_stm32::gpio::{Input, Pull};
+use embassy_traits::gpio::{WaitForFallingEdge, WaitForRisingEdge};
+use example_common::*;
+
+use cortex_m_rt::entry;
+use pac::{interrupt, NVIC};
+use stm32f4::stm32f429 as pac;
+
+#[embassy::task]
+async fn main_task() {
+    let p = embassy_stm32::Peripherals::take().unwrap();
+    let button = Input::new(p.PC13, Pull::Down);
+    let mut button = ExtiInput::new(button, p.EXTI13);
+
+    info!("Press the USER button...");
+
+    loop {
+        button.wait_for_rising_edge().await;
+        info!("Pressed!");
+        button.wait_for_falling_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!");
+
+    let pp = pac::Peripherals::take().unwrap();
+
+    pp.DBGMCU.cr.modify(|_, w| {
+        w.dbg_sleep().set_bit();
+        w.dbg_standby().set_bit();
+        w.dbg_stop().set_bit()
+    });
+    pp.RCC.ahb1enr.modify(|_, w| w.dma1en().enabled());
+
+    pp.RCC.ahb1enr.modify(|_, w| {
+        w.gpioaen().enabled();
+        w.gpioben().enabled();
+        w.gpiocen().enabled();
+        w.gpioden().enabled();
+        w.gpioeen().enabled();
+        w.gpiofen().enabled();
+        w
+    });
+    pp.RCC.apb2enr.modify(|_, w| {
+        w.syscfgen().enabled();
+        w
+    });
+
+    unsafe { embassy::time::set_clock(&ZeroClock) };
+
+    unsafe {
+        NVIC::unmask(interrupt::EXTI0);
+        NVIC::unmask(interrupt::EXTI1);
+        NVIC::unmask(interrupt::EXTI2);
+        NVIC::unmask(interrupt::EXTI3);
+        NVIC::unmask(interrupt::EXTI4);
+        NVIC::unmask(interrupt::EXTI9_5);
+        NVIC::unmask(interrupt::EXTI15_10);
+    }
+
+    let executor = EXECUTOR.put(Executor::new());
+
+    executor.run(|spawner| {
+        unwrap!(spawner.spawn(main_task()));
+    })
+}
+
+// TODO for now irq handling is done by user code using the old pac, until we figure out how interrupts work in the metapac
+
+#[interrupt]
+unsafe fn EXTI0() {
+    exti::on_irq()
+}
+
+#[interrupt]
+unsafe fn EXTI1() {
+    exti::on_irq()
+}
+
+#[interrupt]
+unsafe fn EXTI2() {
+    exti::on_irq()
+}
+
+#[interrupt]
+unsafe fn EXTI3() {
+    exti::on_irq()
+}
+
+#[interrupt]
+unsafe fn EXTI4() {
+    exti::on_irq()
+}
+
+#[interrupt]
+unsafe fn EXTI9_5() {
+    exti::on_irq()
+}
+
+#[interrupt]
+unsafe fn EXTI15_10() {
+    exti::on_irq()
+}