stm32f4/examples: add config and linker script so they're runnable.

embassy-stm32f4-examples/src/bin/exti.rs

@@ -0,0 +1,59 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::{panic, *};
+
+use cortex_m::singleton;
+use cortex_m_rt::entry;
+use embassy::executor::{task, Executor};
+use embassy::gpio::*;
+use embassy::util::Forever;
+use embassy_stm32f4::exti;
+use embassy_stm32f4::exti::*;
+use embassy_stm32f4::interrupt;
+use embassy_stm32f4::serial;
+use futures::pin_mut;
+use stm32f4xx_hal::serial::config::Config;
+use stm32f4xx_hal::stm32;
+use stm32f4xx_hal::syscfg;
+use stm32f4xx_hal::{prelude::*, serial::config};
+
+static EXTI: Forever<exti::ExtiManager> = Forever::new();
+
+#[task]
+async fn run(dp: stm32::Peripherals, cp: cortex_m::Peripherals) {
+    let gpioa = dp.GPIOA.split();
+
+    let button = gpioa.pa0.into_pull_up_input();
+
+    let exti = EXTI.put(exti::ExtiManager::new(dp.EXTI, dp.SYSCFG.constrain()));
+    let pin = exti.new_pin(button, interrupt::take!(EXTI0));
+    pin_mut!(pin);
+
+    info!("Starting loop");
+
+    loop {
+        pin.as_mut().wait_for_rising_edge().await;
+        info!("edge detected!");
+    }
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    let dp = stm32::Peripherals::take().unwrap();
+    let cp = cortex_m::peripheral::Peripherals::take().unwrap();
+
+    let executor = EXECUTOR.put(Executor::new(cortex_m::asm::sev));
+    executor.spawn(run(dp, cp)).unwrap();
+
+    loop {
+        executor.run();
+        //cortex_m::asm::wfe(); // wfe causes RTT to stop working on stm32
+    }
+}

embassy-stm32f4-examples/src/bin/hello.rs

@@ -0,0 +1,40 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::{panic, *};
+
+use cortex_m::singleton;
+use cortex_m_rt::entry;
+use embassy::executor::{task, Executor};
+use embassy::uart::Uart;
+use embassy::util::Forever;
+use embassy_stm32f4::interrupt;
+use embassy_stm32f4::serial;
+use stm32f4xx_hal::serial::config::Config;
+use stm32f4xx_hal::stm32;
+use stm32f4xx_hal::{prelude::*, serial::config};
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let p = stm32f4xx_hal::stm32::Peripherals::take().unwrap();
+    let gpioa = p.GPIOA.split();
+    let gpioc = p.GPIOC.split();
+
+    let mut led = gpioc.pc13.into_push_pull_output();
+    let button = gpioa.pa0.into_pull_up_input();
+    led.set_low().unwrap();
+
+    loop {
+        if button.is_high().unwrap() {
+            led.set_low().unwrap();
+        } else {
+            led.set_high().unwrap();
+        }
+    }
+}

embassy-stm32f4-examples/src/bin/serial.rs

@@ -64,6 +64,6 @@ fn main() -> ! {
 
     loop {
         executor.run();
-        cortex_m::asm::wfe();
+        //cortex_m::asm::wfe(); // wfe causes RTT to stop working on stm32
     }
 }