132 lines
3.0 KiB
Rust
132 lines
3.0 KiB
Rust
use core::convert::TryInto;
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use core::ptr::write_volatile;
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use core::sync::atomic::{fence, Ordering};
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use embassy_hal_common::stm32::flash::f7::get_sector;
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use super::WRITE_SIZE;
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use crate::flash::Error;
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use crate::pac;
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pub(crate) unsafe fn lock() {
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pac::FLASH.cr().modify(|w| w.set_lock(true));
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}
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pub(crate) unsafe fn unlock() {
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pac::FLASH.keyr().write(|w| w.set_key(0x4567_0123));
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pac::FLASH.keyr().write(|w| w.set_key(0xCDEF_89AB));
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}
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pub(crate) unsafe fn begin_write() {
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assert_eq!(0, WRITE_SIZE % 4);
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pac::FLASH.cr().write(|w| {
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w.set_pg(true);
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w.set_psize(pac::flash::vals::Psize::PSIZE32);
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});
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}
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pub(crate) unsafe fn end_write() {
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pac::FLASH.cr().write(|w| w.set_pg(false));
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}
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pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE]) -> Result<(), Error> {
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let mut address = start_address;
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for val in buf.chunks(4) {
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write_volatile(address as *mut u32, u32::from_le_bytes(val.try_into().unwrap()));
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address += val.len() as u32;
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// prevents parallelism errors
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fence(Ordering::SeqCst);
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}
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blocking_wait_ready()
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}
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pub(crate) fn is_eraseable_range(start_address: u32, end_address: u32) -> bool {
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let mut address = start_address;
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while address < end_address {
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let sector = get_sector(address);
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if sector.start != address {
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return false;
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}
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address += sector.size;
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}
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address == end_address
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}
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pub(crate) unsafe fn blocking_erase(start_address: u32, end_address: u32) -> Result<(), Error> {
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let mut address = start_address;
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while address < end_address {
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let sector = get_sector(address);
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erase_sector(sector.index)?;
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address += sector.size;
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}
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Ok(())
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}
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unsafe fn erase_sector(sector: u8) -> Result<(), Error> {
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pac::FLASH.cr().modify(|w| {
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w.set_ser(true);
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w.set_snb(sector)
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});
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pac::FLASH.cr().modify(|w| {
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w.set_strt(true);
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});
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let ret: Result<(), Error> = blocking_wait_ready();
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pac::FLASH.cr().modify(|w| w.set_ser(false));
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clear_all_err();
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ret
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}
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pub(crate) unsafe fn clear_all_err() {
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pac::FLASH.sr().modify(|w| {
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if w.erserr() {
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w.set_erserr(true);
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}
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if w.pgperr() {
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w.set_pgperr(true);
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}
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if w.pgaerr() {
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w.set_pgaerr(true);
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}
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if w.wrperr() {
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w.set_wrperr(true);
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}
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if w.eop() {
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w.set_eop(true);
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}
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});
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}
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unsafe fn blocking_wait_ready() -> Result<(), Error> {
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loop {
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let sr = pac::FLASH.sr().read();
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if !sr.bsy() {
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if sr.erserr() {
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return Err(Error::Seq);
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}
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if sr.pgperr() {
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return Err(Error::Parallelism);
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}
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if sr.pgaerr() {
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return Err(Error::Unaligned);
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}
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if sr.wrperr() {
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return Err(Error::Protected);
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}
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return Ok(());
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}
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}
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}
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