Merge #1377

1377: (embassy-stm32): implement embedded-storage traits for full flash struct r=MathiasKoch a=MathiasKoch



Co-authored-by: Mathias <mk@blackbird.online>

embassy-stm32/build.rs

@@ -255,6 +255,14 @@ fn main() {
         ];
     });
 
+    let max_erase_size = flash_memory_regions
+        .iter()
+        .map(|region| region.settings.as_ref().unwrap().erase_size)
+        .max()
+        .unwrap();
+
+    g.extend(quote! { pub const MAX_ERASE_SIZE: usize = #max_erase_size as usize; });
+
     g.extend(quote! { pub mod flash_regions { #flash_regions } });
 
     // ========

embassy-stm32/src/flash/common.rs

@@ -2,7 +2,7 @@ use atomic_polyfill::{fence, Ordering};
 use embassy_hal_common::drop::OnDrop;
 use embassy_hal_common::{into_ref, PeripheralRef};
 
-use super::{family, Error, FlashLayout, FlashRegion, FlashSector, FLASH_BASE, FLASH_SIZE, WRITE_SIZE};
+use super::{family, Error, FlashLayout, FlashRegion, FlashSector, FLASH_BASE, FLASH_SIZE, MAX_ERASE_SIZE, WRITE_SIZE};
 use crate::flash::FlashBank;
 use crate::Peripheral;
 
@@ -162,6 +162,35 @@ impl FlashRegion {
     }
 }
 
+impl embedded_storage::nor_flash::ErrorType for Flash<'_> {
+    type Error = Error;
+}
+
+impl embedded_storage::nor_flash::ReadNorFlash for Flash<'_> {
+    const READ_SIZE: usize = 1;
+
+    fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
+        self.blocking_read(offset, bytes)
+    }
+
+    fn capacity(&self) -> usize {
+        FLASH_SIZE
+    }
+}
+
+impl embedded_storage::nor_flash::NorFlash for Flash<'_> {
+    const WRITE_SIZE: usize = WRITE_SIZE;
+    const ERASE_SIZE: usize = MAX_ERASE_SIZE;
+
+    fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
+        self.blocking_write(offset, bytes)
+    }
+
+    fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
+        self.blocking_erase(from, to)
+    }
+}
+
 foreach_flash_region! {
     ($type_name:ident, $write_size:literal, $erase_size:literal) => {
         impl crate::_generated::flash_regions::$type_name<'_> {

embassy-stm32/src/flash/mod.rs

@@ -7,6 +7,7 @@ mod common;
 pub use common::*;
 
 pub use crate::_generated::flash_regions::*;
+pub use crate::_generated::MAX_ERASE_SIZE;
 pub use crate::pac::{FLASH_BASE, FLASH_SIZE, WRITE_SIZE};
 
 #[derive(Debug)]