Async F4 flash driver

examples/stm32f4/Cargo.toml

@@ -20,6 +20,7 @@ futures = { version = "0.3.17", default-features = false, features = ["async-awa
 heapless = { version = "0.7.5", default-features = false }
 nb = "1.0.0"
 embedded-storage = "0.3.0"
+embedded-storage-async = "0.3.0"
 
 usb-device = "0.2"
 usbd-serial = "0.1.1"

examples/stm32f4/src/bin/flash_async.rs

@@ -0,0 +1,83 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::{info, unwrap};
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::flash::Flash;
+use embassy_stm32::Peripherals;
+use embassy_stm32::gpio::{AnyPin, Level, Speed, Output, Pin};
+use embedded_storage_async::nor_flash::{AsyncReadNorFlash, AsyncNorFlash};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy::task]
+async fn blinky(p: AnyPin) {
+    let mut led = Output::new(p, Level::High, Speed::Low);
+
+    loop {
+        info!("high");
+        led.set_high();
+        Timer::after(Duration::from_millis(300)).await;
+
+        info!("low");
+        led.set_low();
+        Timer::after(Duration::from_millis(300)).await;
+    }
+}
+
+#[embassy::main]
+async fn main(spawner: Spawner, p: Peripherals) {
+    info!("Hello Flash!");
+
+    let mut f = Flash::unlock(p.FLASH);
+
+    spawner.spawn(blinky(p.PB7.degrade())).unwrap();
+
+    // Sector 5
+    // test_flash(&mut f, 128 * 1024, 128 * 1024).await;
+
+    // Sectors 11..=16, across banks (128K, 16K, 16K, 16K, 16K, 64K)
+    // test_flash(&mut f, (1024 - 128) * 1024, 256 * 1024).await;
+
+    // Sectors 23, last in bank 2
+    test_flash(&mut f, (2048 - 128) * 1024, 128 * 1024).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.read(offset, &mut buf).await);
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(offset, offset + size).await);
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(offset, &mut buf).await);
+    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.read(offset, &mut buf).await);
+    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
+        ]
+    );
+}