136 lines
3.2 KiB
Rust
136 lines
3.2 KiB
Rust
use core::convert::TryInto;
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use core::ptr::write_volatile;
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use atomic_polyfill::{fence, Ordering};
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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 blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
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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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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(super::WRITE_SIZE) {
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for val in chunk.chunks(4) {
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write_volatile(offset as *mut u32, u32::from_le_bytes(val[0..4].try_into().unwrap()));
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offset += 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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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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let start_sector = if from >= (super::FLASH_BASE + super::ERASE_SIZE / 2) as u32 {
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4 + (from - super::FLASH_BASE as u32) / super::ERASE_SIZE as u32
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} else {
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(from - super::FLASH_BASE as u32) / (super::ERASE_SIZE as u32 / 8)
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};
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let end_sector = if to >= (super::FLASH_BASE + super::ERASE_SIZE / 2) as u32 {
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4 + (to - super::FLASH_BASE as u32) / super::ERASE_SIZE as u32
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} else {
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(to - super::FLASH_BASE as u32) / (super::ERASE_SIZE as u32 / 8)
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};
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for sector in start_sector..end_sector {
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let ret = erase_sector(sector as u8);
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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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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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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.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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