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use core::convert::TryInto;
use core::ptr::write_volatile;
use crate::flash::Error;
use crate::pac;
const SECOND_BANK_OFFSET: usize = 0x0010_0000;
const fn is_dual_bank() -> bool {
super::FLASH_SIZE / 2 > super::ERASE_SIZE
}
pub(crate) unsafe fn lock() {
pac::FLASH.bank(0).cr().modify(|w| w.set_lock(true));
if is_dual_bank() {
pac::FLASH.bank(1).cr().modify(|w| w.set_lock(true));
}
}
pub(crate) unsafe fn unlock() {
pac::FLASH.bank(0).keyr().write(|w| w.set_keyr(0x4567_0123));
pac::FLASH.bank(0).keyr().write(|w| w.set_keyr(0xCDEF_89AB));
if is_dual_bank() {
pac::FLASH.bank(1).keyr().write(|w| w.set_keyr(0x4567_0123));
pac::FLASH.bank(1).keyr().write(|w| w.set_keyr(0xCDEF_89AB));
}
}
pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
let bank = if !is_dual_bank() || (offset - super::FLASH_BASE as u32) < SECOND_BANK_OFFSET as u32 {
pac::FLASH.bank(0)
} else {
pac::FLASH.bank(1)
};
bank.cr().write(|w| {
w.set_pg(true);
w.set_psize(2); // 32 bits at once
});
cortex_m::asm::isb();
cortex_m::asm::dsb();
atomic_polyfill::fence(atomic_polyfill::Ordering::SeqCst);
let ret = {
let mut ret: Result<(), Error> = Ok(());
let mut offset = offset;
'outer: for chunk in buf.chunks(super::WRITE_SIZE) {
for val in chunk.chunks(4) {
trace!("Writing at {:x}", offset);
write_volatile(offset as *mut u32, u32::from_le_bytes(val[0..4].try_into().unwrap()));
offset += val.len() as u32;
ret = blocking_wait_ready(bank);
bank.sr().modify(|w| {
if w.eop() {
w.set_eop(true);
}
});
if ret.is_err() {
break 'outer;
}
}
}
ret
};
bank.cr().write(|w| w.set_pg(false));
cortex_m::asm::isb();
cortex_m::asm::dsb();
atomic_polyfill::fence(atomic_polyfill::Ordering::SeqCst);
ret
}
pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
let from = from - super::FLASH_BASE as u32;
let to = to - super::FLASH_BASE as u32;
let bank_size = (super::FLASH_SIZE / 2) as u32;
let (bank, start, end) = if to <= bank_size {
let start_sector = from / super::ERASE_SIZE as u32;
let end_sector = to / super::ERASE_SIZE as u32;
(0, start_sector, end_sector)
} else if from >= SECOND_BANK_OFFSET as u32 && to <= (SECOND_BANK_OFFSET as u32 + bank_size) {
let start_sector = (from - SECOND_BANK_OFFSET as u32) / super::ERASE_SIZE as u32;
let end_sector = (to - SECOND_BANK_OFFSET as u32) / super::ERASE_SIZE as u32;
(1, start_sector, end_sector)
} else {
error!("Attempting to write outside of defined sectors");
return Err(Error::Unaligned);
};
trace!("Erasing bank {}, sectors from {} to {}", bank, start, end);
for sector in start..end {
let ret = erase_sector(pac::FLASH.bank(bank), sector as u8);
if ret.is_err() {
return ret;
}
}
Ok(())
}
unsafe fn erase_sector(bank: pac::flash::Bank, sector: u8) -> Result<(), Error> {
bank.cr().modify(|w| {
w.set_ser(true);
w.set_snb(sector)
});
bank.cr().modify(|w| {
w.set_start(true);
});
let ret: Result<(), Error> = blocking_wait_ready(bank);
bank.cr().modify(|w| w.set_ser(false));
bank_clear_all_err(bank);
ret
}
pub(crate) unsafe fn clear_all_err() {
bank_clear_all_err(pac::FLASH.bank(0));
bank_clear_all_err(pac::FLASH.bank(1));
}
unsafe fn bank_clear_all_err(bank: pac::flash::Bank) {
bank.sr().modify(|w| {
if w.wrperr() {
w.set_wrperr(true);
}
if w.pgserr() {
w.set_pgserr(true);
}
if w.strberr() {
// single address was written multiple times, can be ignored
w.set_strberr(true);
}
if w.incerr() {
// writing to a different address when programming 256 bit word was not finished
w.set_incerr(true);
}
if w.operr() {
w.set_operr(true);
}
if w.sneccerr1() {
// single ECC error
w.set_sneccerr1(true);
}
if w.dbeccerr() {
// double ECC error
w.set_dbeccerr(true);
}
if w.rdperr() {
w.set_rdperr(true);
}
if w.rdserr() {
w.set_rdserr(true);
}
});
}
pub(crate) unsafe fn blocking_wait_ready(bank: pac::flash::Bank) -> Result<(), Error> {
loop {
let sr = bank.sr().read();
if !sr.bsy() && !sr.qw() {
if sr.wrperr() {
return Err(Error::Protected);
}
if sr.pgserr() {
error!("pgserr");
return Err(Error::Seq);
}
if sr.incerr() {
// writing to a different address when programming 256 bit word was not finished
error!("incerr");
return Err(Error::Seq);
}
if sr.operr() {
return Err(Error::Prog);
}
if sr.sneccerr1() {
// single ECC error
return Err(Error::Prog);
}
if sr.dbeccerr() {
// double ECC error
return Err(Error::Prog);
}
if sr.rdperr() {
return Err(Error::Protected);
}
if sr.rdserr() {
return Err(Error::Protected);
}
return Ok(());
}
}
}
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