Add stm32 flash + bootloader support

* Add flash drivers for L0, L1, L4, WB and WL. Not tested for WB, but
should be similar to WL.
* Add embassy-boot-stm32 for bootloading on STM32.
* Add flash examples and bootloader examples
* Update stm32-data

2 files changed, 44 insertions, 0 deletions

diff --git a/examples/stm32l1/Cargo.toml b/examples/stm32l1/Cargo.toml
index a7a6c228..ce6b0772 100644
--- a/examples/stm32l1/Cargo.toml
+++ b/examples/stm32l1/Cargo.toml
@@ -18,3 +18,4 @@ embedded-hal = "0.2.6"
 panic-probe = { version = "0.3", features = ["print-defmt"] }
 futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
 heapless = { version = "0.7.5", default-features = false }
+embedded-storage = "0.3.0"
diff --git a/examples/stm32l1/src/bin/flash.rs b/examples/stm32l1/src/bin/flash.rs
new file mode 100644
index 00000000..b234289a
--- /dev/null
+++ b/examples/stm32l1/src/bin/flash.rs
@@ -0,0 +1,43 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::{info, unwrap};
+use embassy::executor::Spawner;
+use embassy_stm32::flash::Flash;
+use embassy_stm32::Peripherals;
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello Flash!");
+
+    const ADDR: u32 = 0x8026000;
+
+    let mut f = Flash::unlock(p.FLASH);
+
+    info!("Reading...");
+    let mut buf = [0u8; 8];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(ADDR, ADDR + 256));
+
+    info!("Reading...");
+    let mut buf = [0u8; 8];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read after erase: {=[u8]:x}", buf);
+
+    info!("Writing...");
+    unwrap!(f.write(ADDR, &[1, 2, 3, 4, 5, 6, 7, 8]));
+
+    info!("Reading...");
+    let mut buf = [0u8; 8];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+    assert_eq!(&buf[..], &[1, 2, 3, 4, 5, 6, 7, 8]);
+}