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use core::convert::TryInto;
use core::ptr::write_volatile;
use core::sync::atomic::{fence, Ordering};
use super::{FlashRegion, FlashSector, FLASH_REGIONS, WRITE_SIZE};
use crate::flash::Error;
use crate::pac;
pub const fn is_default_layout() -> bool {
true
}
pub const fn get_flash_regions() -> &'static [&'static FlashRegion] {
&FLASH_REGIONS
}
pub(crate) unsafe fn lock() {
pac::FLASH.cr().modify(|w| w.set_lock(true));
}
pub(crate) unsafe fn unlock() {
pac::FLASH.keyr().write(|w| w.set_fkeyr(0x4567_0123));
pac::FLASH.keyr().write(|w| w.set_fkeyr(0xCDEF_89AB));
}
pub(crate) unsafe fn enable_blocking_write() {
assert_eq!(0, WRITE_SIZE % 2);
pac::FLASH.cr().write(|w| w.set_pg(true));
}
pub(crate) unsafe fn disable_blocking_write() {
pac::FLASH.cr().write(|w| w.set_pg(false));
}
pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE]) -> Result<(), Error> {
let mut address = start_address;
for chunk in buf.chunks(2) {
write_volatile(address as *mut u16, u16::from_le_bytes(chunk.try_into().unwrap()));
address += chunk.len() as u32;
// prevents parallelism errors
fence(Ordering::SeqCst);
}
wait_ready_blocking()
}
pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
pac::FLASH.cr().modify(|w| {
w.set_per(true);
});
pac::FLASH.ar().write(|w| w.set_far(sector.start));
pac::FLASH.cr().modify(|w| {
w.set_strt(true);
});
let mut ret: Result<(), Error> = wait_ready_blocking();
if !pac::FLASH.sr().read().eop() {
trace!("FLASH: EOP not set");
ret = Err(Error::Prog);
} else {
pac::FLASH.sr().write(|w| w.set_eop(true));
}
pac::FLASH.cr().modify(|w| w.set_per(false));
clear_all_err();
if ret.is_err() {
return ret;
}
Ok(())
}
pub(crate) unsafe fn clear_all_err() {
// read and write back the same value.
// This clears all "write 0 to clear" bits.
pac::FLASH.sr().modify(|_| {});
}
unsafe fn wait_ready_blocking() -> Result<(), Error> {
loop {
let sr = pac::FLASH.sr().read();
if !sr.bsy() {
if sr.wrprterr() {
return Err(Error::Protected);
}
if sr.pgerr() {
return Err(Error::Seq);
}
return Ok(());
}
}
}
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