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use embassy_sync::blocking_mutex::raw::RawMutex;
use embassy_sync::mutex::Mutex;
use embedded_storage::nor_flash::{ErrorType, NorFlashError, NorFlashErrorKind};
#[cfg(feature = "nightly")]
use embedded_storage_async::nor_flash::{NorFlash, ReadNorFlash};
/// A logical partition of an underlying shared flash
///
/// A partition holds an offset and a size of the flash,
/// and is restricted to operate with that range.
/// There is no guarantee that muliple partitions on the same flash
/// operate on mutually exclusive ranges - such a separation is up to
/// the user to guarantee.
pub struct Partition<'a, M: RawMutex, T> {
flash: &'a Mutex<M, T>,
offset: u32,
size: u32,
}
#[derive(Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Error<T> {
Partition,
OutOfBounds,
Flash(T),
}
impl<'a, M: RawMutex, T> Partition<'a, M, T> {
/// Create a new partition
pub const fn new(flash: &'a Mutex<M, T>, offset: u32, size: u32) -> Self {
Self { flash, offset, size }
}
}
impl<T: NorFlashError> NorFlashError for Error<T> {
fn kind(&self) -> NorFlashErrorKind {
match self {
Error::Partition => NorFlashErrorKind::Other,
Error::OutOfBounds => NorFlashErrorKind::OutOfBounds,
Error::Flash(f) => f.kind(),
}
}
}
impl<M: RawMutex, T: ErrorType> ErrorType for Partition<'_, M, T> {
type Error = Error<T::Error>;
}
#[cfg(feature = "nightly")]
impl<M: RawMutex, T: ReadNorFlash> ReadNorFlash for Partition<'_, M, T> {
const READ_SIZE: usize = T::READ_SIZE;
async fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
if self.offset % T::READ_SIZE as u32 != 0 || self.size % T::READ_SIZE as u32 != 0 {
return Err(Error::Partition);
}
if offset + bytes.len() as u32 > self.size {
return Err(Error::OutOfBounds);
}
let mut flash = self.flash.lock().await;
flash.read(self.offset + offset, bytes).await.map_err(Error::Flash)
}
fn capacity(&self) -> usize {
self.size as usize
}
}
#[cfg(feature = "nightly")]
impl<M: RawMutex, T: NorFlash> NorFlash for Partition<'_, M, T> {
const WRITE_SIZE: usize = T::WRITE_SIZE;
const ERASE_SIZE: usize = T::ERASE_SIZE;
async fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
if self.offset % T::WRITE_SIZE as u32 != 0 || self.size % T::WRITE_SIZE as u32 != 0 {
return Err(Error::Partition);
}
if offset + bytes.len() as u32 > self.size {
return Err(Error::OutOfBounds);
}
let mut flash = self.flash.lock().await;
flash.write(self.offset + offset, bytes).await.map_err(Error::Flash)
}
async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
if self.offset % T::ERASE_SIZE as u32 != 0 || self.size % T::ERASE_SIZE as u32 != 0 {
return Err(Error::Partition);
}
if to > self.size {
return Err(Error::OutOfBounds);
}
let mut flash = self.flash.lock().await;
flash
.erase(self.offset + from, self.offset + to)
.await
.map_err(Error::Flash)
}
}
#[cfg(test)]
mod tests {
use embassy_sync::blocking_mutex::raw::NoopRawMutex;
use super::*;
use crate::flash::mem_flash::MemFlash;
#[futures_test::test]
async fn can_read() {
let mut flash = MemFlash::<1024, 128, 4>::default();
flash.mem[12..20].fill(0xAA);
let flash = Mutex::<NoopRawMutex, _>::new(flash);
let mut partition = Partition::new(&flash, 8, 12);
let mut read_buf = [0; 8];
partition.read(4, &mut read_buf).await.unwrap();
assert!(read_buf.iter().position(|&x| x != 0xAA).is_none());
}
#[futures_test::test]
async fn can_write() {
let flash = MemFlash::<1024, 128, 4>::default();
let flash = Mutex::<NoopRawMutex, _>::new(flash);
let mut partition = Partition::new(&flash, 8, 12);
let write_buf = [0xAA; 8];
partition.write(4, &write_buf).await.unwrap();
let flash = flash.try_lock().unwrap();
assert!(flash.mem[12..20].iter().position(|&x| x != 0xAA).is_none());
}
#[futures_test::test]
async fn can_erase() {
let flash = MemFlash::<1024, 128, 4>::new(0x00);
let flash = Mutex::<NoopRawMutex, _>::new(flash);
let mut partition = Partition::new(&flash, 128, 256);
partition.erase(0, 128).await.unwrap();
let flash = flash.try_lock().unwrap();
assert!(flash.mem[128..256].iter().position(|&x| x != 0xFF).is_none());
}
}
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