144 lines
3.6 KiB
Rust
144 lines
3.6 KiB
Rust
use core::convert::TryInto;
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use core::mem::size_of;
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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::f4::{get_sector, SECOND_BANK_SECTOR_OFFSET};
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use super::{FlashRegion, FLASH_SIZE};
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use crate::flash::Error;
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use crate::pac;
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pub(crate) const MAX_WRITE_SIZE: usize = super::BANK1_REGION3::WRITE_SIZE;
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pub(crate) const MAX_ERASE_SIZE: usize = super::BANK1_REGION3::ERASE_SIZE;
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unsafe fn is_dual_bank() -> bool {
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match FLASH_SIZE / 1024 {
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// 1 MB devices depend on configuration
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1024 => {
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if cfg!(any(stm32f427, stm32f429, stm32f437, stm32f439, stm32f469, stm32f479)) {
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pac::FLASH.optcr().read().db1m()
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} else {
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false
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}
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}
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// 2 MB devices are always dual bank
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2048 => true,
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// All other devices are single bank
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_ => false,
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}
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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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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(first_address: 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 address = first_address;
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for chunk in buf.chunks(MAX_WRITE_SIZE) {
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let vals = chunk.chunks_exact(size_of::<u32>());
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assert!(vals.remainder().is_empty());
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for val in vals {
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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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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_address: u32, to_address: u32) -> Result<(), Error> {
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let mut addr = from_address;
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let dual_bank = is_dual_bank();
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while addr < to_address {
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let sector = get_sector(addr, dual_bank, FLASH_SIZE as u32);
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erase_sector(sector.index)?;
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addr += 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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let bank = sector / SECOND_BANK_SECTOR_OFFSET as u8;
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let snb = (bank << 4) + (sector % SECOND_BANK_SECTOR_OFFSET as u8);
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trace!("Erasing sector: {}", sector);
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pac::FLASH.cr().modify(|w| {
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w.set_ser(true);
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w.set_snb(snb)
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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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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().write(|w| {
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w.set_pgserr(true);
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w.set_pgperr(true);
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w.set_pgaerr(true);
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w.set_wrperr(true);
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w.set_eop(true);
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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.pgserr() {
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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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