105 lines
2.5 KiB
Rust
105 lines
2.5 KiB
Rust
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.seccr().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.seccr().read().lock() {
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pac::FLASH.seckeyr().write_value(0x4567_0123);
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pac::FLASH.seckeyr().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 % 4);
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pac::FLASH.seccr().write(|w| {
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w.set_pg(pac::flash::vals::SeccrPg::B_0X1);
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});
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}
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pub(crate) unsafe fn disable_blocking_write() {
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pac::FLASH.seccr().write(|w| w.set_pg(pac::flash::vals::SeccrPg::B_0X0));
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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) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
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pac::FLASH.seccr().modify(|w| {
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w.set_per(pac::flash::vals::SeccrPer::B_0X1);
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w.set_pnb(sector.index_in_bank)
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});
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pac::FLASH.seccr().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
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.seccr()
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.modify(|w| w.set_per(pac::flash::vals::SeccrPer::B_0X0));
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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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// 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.secsr().modify(|_| {});
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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.secsr().read();
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if !sr.bsy() {
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if sr.pgserr() {
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return Err(Error::Seq);
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}
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if sr.sizerr() {
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return Err(Error::Size);
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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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if sr.progerr() {
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return Err(Error::Prog);
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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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