stm32: add async flash example for h7

Author: fbrozovic

examples/stm32h7/src/bin/flash_async.rs

@@ -0,0 +1,84 @@
+#![no_std]
+#![no_main]
+
+use defmt::{info, unwrap};
+use embassy_executor::Spawner;
+use embassy_stm32::flash::{Flash, InterruptHandler};
+use embassy_stm32::gpio::{AnyPin, Level, Output, Speed};
+use embassy_stm32::{Peri, bind_interrupts};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    FLASH => InterruptHandler;
+});
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_stm32::init(Default::default());
+    info!("Hello Flash!");
+
+    let mut f = Flash::new(p.FLASH, Irqs);
+
+    // Led should blink uninterrupted during ~2sec erase operation
+    spawner.spawn(blinky(p.PB14.into()).unwrap());
+
+    // Test on bank 2 in order not to stall CPU.
+    test_flash(&mut f, 1024 * 1024, 128 * 1024).await;
+}
+
+#[embassy_executor::task]
+async fn blinky(p: Peri<'static, AnyPin>) {
+    let mut led = Output::new(p, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after_millis(300).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after_millis(300).await;
+    }
+}
+
+async fn test_flash<'a>(f: &mut Flash<'a>, offset: u32, size: u32) {
+    info!("Testing offset: {=u32:#X}, size: {=u32:#X}", offset, size);
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.blocking_read(offset, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(offset, offset + size).await);
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.blocking_read(offset, &mut buf));
+    info!("Read after erase: {=[u8]:x}", buf);
+
+    info!("Writing...");
+    unwrap!(
+        f.write(
+            offset,
+            &[
+                1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
+                29, 30, 31, 32
+            ]
+        )
+        .await
+    );
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.blocking_read(offset, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+    assert_eq!(
+        &buf[..],
+        &[
+            1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+            30, 31, 32
+        ]
+    );
+}