103 lines
2.4 KiB
Rust
103 lines
2.4 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 super::{FlashRegion, FlashSector, FLASH_REGIONS, WRITE_SIZE};
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use crate::flash::Error;
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use crate::pac;
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pub(crate) const fn is_default_layout() -> bool {
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true
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}
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pub(crate) const fn get_flash_regions() -> &'static [&'static FlashRegion] {
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&FLASH_REGIONS
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}
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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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if pac::FLASH.cr().read().lock() {
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pac::FLASH.keyr().write_value(0x4567_0123);
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pac::FLASH.keyr().write_value(0xCDEF_89AB);
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}
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}
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pub(crate) unsafe fn enable_blocking_write() {
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assert_eq!(0, WRITE_SIZE % 2);
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pac::FLASH.cr().write(|w| w.set_pg(true));
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}
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pub(crate) unsafe fn disable_blocking_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 chunk in buf.chunks(2) {
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write_volatile(address as *mut u16, u16::from_le_bytes(chunk.try_into().unwrap()));
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address += chunk.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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wait_ready_blocking()
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}
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pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
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pac::FLASH.cr().modify(|w| {
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w.set_per(true);
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});
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pac::FLASH.ar().write(|w| w.set_far(sector.start));
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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 mut ret: Result<(), Error> = wait_ready_blocking();
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if !pac::FLASH.sr().read().eop() {
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trace!("FLASH: EOP not set");
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ret = Err(Error::Prog);
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} else {
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pac::FLASH.sr().write(|w| w.set_eop(true));
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}
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pac::FLASH.cr().modify(|w| w.set_per(false));
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clear_all_err();
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if ret.is_err() {
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return ret;
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}
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Ok(())
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}
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pub(crate) unsafe fn clear_all_err() {
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// read and write back the same value.
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// This clears all "write 1 to clear" bits.
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pac::FLASH.sr().modify(|_| {});
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}
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unsafe fn wait_ready_blocking() -> 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.wrprt() {
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return Err(Error::Protected);
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}
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if sr.pgerr() {
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return Err(Error::Seq);
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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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