1 files changed, 127 insertions, 0 deletions

diff --git a/embassy-embedded-hal/src/flash/mem_flash.rs b/embassy-embedded-hal/src/flash/mem_flash.rs
new file mode 100644
index 000000000..4e10627df
--- /dev/null
+++ b/embassy-embedded-hal/src/flash/mem_flash.rs
@@ -0,0 +1,127 @@
+use alloc::vec::Vec;
+
+use embedded_storage::nor_flash::{ErrorType, NorFlash, ReadNorFlash};
+use embedded_storage_async::nor_flash::{NorFlash as AsyncNorFlash, ReadNorFlash as AsyncReadNorFlash};
+
+extern crate alloc;
+
+pub(crate) struct MemFlash<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> {
+    pub mem: [u8; SIZE],
+    pub writes: Vec<(u32, usize)>,
+    pub erases: Vec<(u32, u32)>,
+}
+
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE> {
+    #[allow(unused)]
+    pub const fn new(fill: u8) -> Self {
+        Self {
+            mem: [fill; SIZE],
+            writes: Vec::new(),
+            erases: Vec::new(),
+        }
+    }
+
+    fn read(&mut self, offset: u32, bytes: &mut [u8]) {
+        let len = bytes.len();
+        bytes.copy_from_slice(&self.mem[offset as usize..offset as usize + len]);
+    }
+
+    fn write(&mut self, offset: u32, bytes: &[u8]) {
+        self.writes.push((offset, bytes.len()));
+        let offset = offset as usize;
+        assert_eq!(0, bytes.len() % WRITE_SIZE);
+        assert_eq!(0, offset % WRITE_SIZE);
+        assert!(offset + bytes.len() <= SIZE);
+
+        self.mem[offset..offset + bytes.len()].copy_from_slice(bytes);
+    }
+
+    fn erase(&mut self, from: u32, to: u32) {
+        self.erases.push((from, to));
+        let from = from as usize;
+        let to = to as usize;
+        assert_eq!(0, from % ERASE_SIZE);
+        assert_eq!(0, to % ERASE_SIZE);
+        self.mem[from..to].fill(0xff);
+    }
+}
+
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> Default
+    for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
+{
+    fn default() -> Self {
+        Self::new(0xff)
+    }
+}
+
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> ErrorType
+    for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
+{
+    type Error = core::convert::Infallible;
+}
+
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> ReadNorFlash
+    for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
+{
+    const READ_SIZE: usize = 1;
+
+    fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
+        self.read(offset, bytes);
+        Ok(())
+    }
+
+    fn capacity(&self) -> usize {
+        SIZE
+    }
+}
+
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> NorFlash
+    for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
+{
+    const WRITE_SIZE: usize = WRITE_SIZE;
+    const ERASE_SIZE: usize = ERASE_SIZE;
+
+    fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
+        self.write(offset, bytes);
+        Ok(())
+    }
+
+    fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
+        self.erase(from, to);
+        Ok(())
+    }
+}
+
+#[cfg(feature = "nightly")]
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> AsyncReadNorFlash
+    for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
+{
+    const READ_SIZE: usize = 1;
+
+    async fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
+        self.read(offset, bytes);
+        Ok(())
+    }
+
+    fn capacity(&self) -> usize {
+        SIZE
+    }
+}
+
+#[cfg(feature = "nightly")]
+impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> AsyncNorFlash
+    for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
+{
+    const WRITE_SIZE: usize = WRITE_SIZE;
+    const ERASE_SIZE: usize = ERASE_SIZE;
+
+    async fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
+        self.write(offset, bytes);
+        Ok(())
+    }
+
+    async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
+        self.erase(from, to);
+        Ok(())
+    }
+}