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|
use embassy_sync::blocking_mutex::raw::RawMutex;
use embassy_sync::blocking_mutex::Mutex;
use embedded_storage::nor_flash::{ErrorType, NorFlash, ReadNorFlash};
use super::Error;
/// 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 BlockingPartition<'a, M: RawMutex, T: NorFlash> {
flash: &'a Mutex<M, T>,
offset: u32,
size: u32,
}
impl<'a, M: RawMutex, T: NorFlash> BlockingPartition<'a, M, T> {
/// Create a new partition
pub const fn new(flash: &'a Mutex<M, T>, offset: u32, size: u32) -> Self {
if offset % T::READ_SIZE as u32 != 0 || offset % T::WRITE_SIZE as u32 != 0 || offset % T::ERASE_SIZE as u32 != 0
{
panic!("Partition offset must be a multiple of read, write and erase size");
}
if size % T::READ_SIZE as u32 != 0 || size % T::WRITE_SIZE as u32 != 0 || size % T::ERASE_SIZE as u32 != 0 {
panic!("Partition size must be a multiple of read, write and erase size");
}
Self { flash, offset, size }
}
}
impl<M: RawMutex, T: NorFlash> ErrorType for BlockingPartition<'_, M, T> {
type Error = Error<T::Error>;
}
impl<M: RawMutex, T: NorFlash> ReadNorFlash for BlockingPartition<'_, M, T> {
const READ_SIZE: usize = T::READ_SIZE;
fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
if offset + bytes.len() as u32 > self.size {
return Err(Error::OutOfBounds);
}
self.flash
.lock(|flash| flash.read(self.offset + offset, bytes).map_err(Error::Flash))
}
fn capacity(&self) -> usize {
self.size as usize
}
}
impl<M: RawMutex, T: NorFlash> NorFlash for BlockingPartition<'_, M, T> {
const WRITE_SIZE: usize = T::WRITE_SIZE;
const ERASE_SIZE: usize = T::ERASE_SIZE;
fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
if offset + bytes.len() as u32 > self.size {
return Err(Error::OutOfBounds);
}
self.flash
.lock(|flash| flash.write(self.offset + offset, bytes).map_err(Error::Flash))
}
fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
if to > self.size {
return Err(Error::OutOfBounds);
}
self.flash
.lock(|flash| flash.erase(self.offset + from, self.offset + to).map_err(Error::Flash))
}
}
#[cfg(test)]
mod tests {
use embassy_sync::blocking_mutex::raw::NoopRawMutex;
use super::*;
use crate::flash::mem_flash::MemFlash;
#[test]
fn can_read() {
let mut flash = MemFlash::<1024, 128, 4>::default();
flash.mem[132..132 + 8].fill(0xAA);
let flash = Mutex::<NoopRawMutex, _>::new(flash);
let mut partition = BlockingPartition::new(&flash, 128, 256);
let mut read_buf = [0; 8];
partition.read(4, &mut read_buf).unwrap();
assert!(read_buf.iter().position(|&x| x != 0xAA).is_none());
}
#[test]
fn can_write() {
let flash = MemFlash::<1024, 128, 4>::default();
let flash = Mutex::<NoopRawMutex, _>::new(flash);
let mut partition = BlockingPartition::new(&flash, 128, 256);
let write_buf = [0xAA; 8];
partition.write(4, &write_buf).unwrap();
let flash = flash.into_inner();
assert!(flash.mem[132..132 + 8].iter().position(|&x| x != 0xAA).is_none());
}
#[test]
fn can_erase() {
let flash = MemFlash::<1024, 128, 4>::new(0x00);
let flash = Mutex::<NoopRawMutex, _>::new(flash);
let mut partition = BlockingPartition::new(&flash, 128, 256);
partition.erase(0, 128).unwrap();
let flash = flash.into_inner();
assert!(flash.mem[128..256].iter().position(|&x| x != 0xFF).is_none());
}
}
|
