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|
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(())
}
}
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
}
}
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(())
}
}
|
