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use core::marker::PhantomData;
use core::sync::atomic::{fence, Ordering};
use embassy_hal_internal::drop::OnDrop;
use embassy_hal_internal::into_ref;
use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
use embassy_sync::mutex::Mutex;
use super::{
blocking_read, ensure_sector_aligned, family, get_sector, Async, Error, Flash, FlashLayout, FLASH_BASE, FLASH_SIZE,
WRITE_SIZE,
};
use crate::interrupt::InterruptExt;
use crate::peripherals::FLASH;
use crate::{interrupt, Peripheral};
pub(super) static REGION_ACCESS: Mutex<CriticalSectionRawMutex, ()> = Mutex::new(());
impl<'d> Flash<'d, Async> {
pub fn new(
p: impl Peripheral<P = FLASH> + 'd,
_irq: impl interrupt::typelevel::Binding<crate::interrupt::typelevel::FLASH, InterruptHandler> + 'd,
) -> Self {
into_ref!(p);
crate::interrupt::FLASH.unpend();
unsafe { crate::interrupt::FLASH.enable() };
Self {
inner: p,
_mode: PhantomData,
}
}
pub fn into_regions(self) -> FlashLayout<'d, Async> {
assert!(family::is_default_layout());
FlashLayout::new(self.inner)
}
pub async fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Error> {
unsafe { write_chunked(FLASH_BASE as u32, FLASH_SIZE as u32, offset, bytes).await }
}
pub async fn erase(&mut self, from: u32, to: u32) -> Result<(), Error> {
unsafe { erase_sectored(FLASH_BASE as u32, from, to).await }
}
}
/// Interrupt handler
pub struct InterruptHandler;
impl interrupt::typelevel::Handler<crate::interrupt::typelevel::FLASH> for InterruptHandler {
unsafe fn on_interrupt() {
family::on_interrupt();
}
}
impl embedded_storage_async::nor_flash::ReadNorFlash for Flash<'_, Async> {
const READ_SIZE: usize = super::READ_SIZE;
async fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
self.read(offset, bytes)
}
fn capacity(&self) -> usize {
FLASH_SIZE
}
}
impl embedded_storage_async::nor_flash::NorFlash for Flash<'_, Async> {
const WRITE_SIZE: usize = WRITE_SIZE;
const ERASE_SIZE: usize = super::MAX_ERASE_SIZE;
async fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
self.write(offset, bytes).await
}
async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
self.erase(from, to).await
}
}
pub(super) async unsafe fn write_chunked(base: u32, size: u32, offset: u32, bytes: &[u8]) -> Result<(), Error> {
if offset + bytes.len() as u32 > size {
return Err(Error::Size);
}
if offset % WRITE_SIZE as u32 != 0 || bytes.len() % WRITE_SIZE != 0 {
return Err(Error::Unaligned);
}
let mut address = base + offset;
trace!("Writing {} bytes at 0x{:x}", bytes.len(), address);
for chunk in bytes.chunks(WRITE_SIZE) {
family::clear_all_err();
fence(Ordering::SeqCst);
family::unlock();
fence(Ordering::SeqCst);
family::enable_write();
fence(Ordering::SeqCst);
let _on_drop = OnDrop::new(|| {
family::disable_write();
fence(Ordering::SeqCst);
family::lock();
});
family::write(address, chunk.try_into().unwrap()).await?;
address += WRITE_SIZE as u32;
}
Ok(())
}
pub(super) async unsafe fn erase_sectored(base: u32, from: u32, to: u32) -> Result<(), Error> {
let start_address = base + from;
let end_address = base + to;
let regions = family::get_flash_regions();
ensure_sector_aligned(start_address, end_address, regions)?;
trace!("Erasing from 0x{:x} to 0x{:x}", start_address, end_address);
let mut address = start_address;
while address < end_address {
let sector = get_sector(address, regions);
trace!("Erasing sector: {:?}", sector);
family::clear_all_err();
fence(Ordering::SeqCst);
family::unlock();
fence(Ordering::SeqCst);
let _on_drop = OnDrop::new(|| family::lock());
family::erase_sector(§or).await?;
address += sector.size;
}
Ok(())
}
foreach_flash_region! {
($type_name:ident, $write_size:literal, $erase_size:literal) => {
impl crate::_generated::flash_regions::$type_name<'_, Async> {
pub async fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Error> {
blocking_read(self.0.base, self.0.size, offset, bytes)
}
pub async fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Error> {
let _guard = REGION_ACCESS.lock().await;
unsafe { write_chunked(self.0.base, self.0.size, offset, bytes).await }
}
pub async fn erase(&mut self, from: u32, to: u32) -> Result<(), Error> {
let _guard = REGION_ACCESS.lock().await;
unsafe { erase_sectored(self.0.base, from, to).await }
}
}
impl embedded_storage_async::nor_flash::ReadNorFlash for crate::_generated::flash_regions::$type_name<'_, Async> {
const READ_SIZE: usize = super::READ_SIZE;
async fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
self.read(offset, bytes).await
}
fn capacity(&self) -> usize {
self.0.size as usize
}
}
impl embedded_storage_async::nor_flash::NorFlash for crate::_generated::flash_regions::$type_name<'_, Async> {
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).await
}
async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
self.erase(from, to).await
}
}
};
}
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