102 lines
2.3 KiB
Rust
102 lines
2.3 KiB
Rust
use core::convert::TryInto;
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use core::ptr::write_volatile;
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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_fkeyr(0x4567_0123));
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pac::FLASH.keyr().write(|w| w.set_fkeyr(0xCDEF_89AB));
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}
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pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
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pac::FLASH.cr().write(|w| w.set_pg(true));
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let ret = {
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let mut ret: Result<(), Error> = Ok(());
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let mut offset = offset;
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for chunk in buf.chunks(2) {
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write_volatile(offset as *mut u16, u16::from_le_bytes(chunk[0..2].try_into().unwrap()));
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offset += chunk.len() as u32;
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ret = blocking_wait_ready();
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if ret.is_err() {
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break;
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}
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}
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ret
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};
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pac::FLASH.cr().write(|w| w.set_pg(false));
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ret
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}
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pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
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for page in (from..to).step_by(super::ERASE_SIZE) {
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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(page));
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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> = blocking_wait_ready();
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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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}
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Ok(())
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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.pgerr() {
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w.set_pgerr(true);
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}
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if w.wrprterr() {
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w.set_wrprterr(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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pub(crate) 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.wrprterr() {
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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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