177 lines
4.1 KiB
Rust
177 lines
4.1 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 super::{ERASE_SIZE, FLASH_BASE, FLASH_SIZE};
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use crate::flash::Error;
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use crate::pac;
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const SECOND_BANK_SECTOR_START: u32 = 12;
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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(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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struct FlashSector {
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index: u8,
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size: u32,
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}
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fn get_sector(addr: u32, dual_bank: bool) -> FlashSector {
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let offset = addr - FLASH_BASE as u32;
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let bank_size = match dual_bank {
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true => FLASH_SIZE / 2,
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false => FLASH_SIZE,
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} as u32;
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let bank = offset / bank_size;
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let offset_in_bank = offset % bank_size;
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let index_in_bank = if offset_in_bank >= ERASE_SIZE as u32 / 2 {
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4 + offset_in_bank / ERASE_SIZE as u32
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} else {
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offset_in_bank / (ERASE_SIZE as u32 / 8)
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};
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// First 4 sectors are 16KB, then one 64KB, and rest are 128KB
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let size = match index_in_bank {
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0..=3 => 16 * 1024,
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4 => 64 * 1024,
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_ => 128 * 1024,
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};
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let index = if bank == 1 {
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SECOND_BANK_SECTOR_START + index_in_bank
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} else {
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index_in_bank
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} as u8;
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FlashSector { index, size }
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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 mut addr = from;
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let dual_bank = is_dual_bank();
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while addr < to {
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let sector = get_sector(addr, dual_bank);
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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_START as u8;
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let snb = (bank << 4) + (sector % SECOND_BANK_SECTOR_START 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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