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use core::convert::TryInto;
use core::ptr::write_volatile;
use core::sync::atomic::{fence, Ordering};
use super::{FlashRegion, FlashSector, FLASH_REGIONS, WRITE_SIZE};
use crate::flash::Error;
use crate::pac;
pub(crate) const fn is_default_layout() -> bool {
true
}
pub(crate) const fn get_flash_regions() -> &'static [&'static FlashRegion] {
&FLASH_REGIONS
}
pub(crate) unsafe fn lock() {
pac::FLASH.cr().modify(|w| w.set_lock(true));
}
pub(crate) unsafe fn unlock() {
if pac::FLASH.cr().read().lock() {
pac::FLASH.keyr().write_value(0x4567_0123);
pac::FLASH.keyr().write_value(0xCDEF_89AB);
}
}
pub(crate) unsafe fn enable_blocking_write() {
assert_eq!(0, WRITE_SIZE % 4);
pac::FLASH.cr().write(|w| {
w.set_pg(true);
w.set_psize(pac::flash::vals::Psize::PSIZE32);
});
}
pub(crate) unsafe fn disable_blocking_write() {
pac::FLASH.cr().write(|w| w.set_pg(false));
}
pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE]) -> Result<(), Error> {
let mut address = start_address;
for val in buf.chunks(4) {
write_volatile(address as *mut u32, u32::from_le_bytes(val.try_into().unwrap()));
address += val.len() as u32;
// prevents parallelism errors
fence(Ordering::SeqCst);
}
blocking_wait_ready()
}
pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
pac::FLASH.cr().modify(|w| {
w.set_ser(true);
w.set_snb(sector.index_in_bank)
});
pac::FLASH.cr().modify(|w| {
w.set_strt(true);
});
let ret: Result<(), Error> = blocking_wait_ready();
pac::FLASH.cr().modify(|w| w.set_ser(false));
clear_all_err();
ret
}
pub(crate) unsafe fn clear_all_err() {
// read and write back the same value.
// This clears all "write 1 to clear" bits.
pac::FLASH.sr().modify(|_| {});
}
unsafe fn blocking_wait_ready() -> Result<(), Error> {
loop {
let sr = pac::FLASH.sr().read();
if !sr.bsy() {
if sr.erserr() {
return Err(Error::Seq);
}
if sr.pgperr() {
return Err(Error::Parallelism);
}
if sr.pgaerr() {
return Err(Error::Unaligned);
}
if sr.wrperr() {
return Err(Error::Protected);
}
return Ok(());
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::flash::{get_sector, FlashBank};
#[test]
#[cfg(stm32f732)]
fn can_get_sector() {
const SMALL_SECTOR_SIZE: u32 = 16 * 1024;
const MEDIUM_SECTOR_SIZE: u32 = 64 * 1024;
const LARGE_SECTOR_SIZE: u32 = 128 * 1024;
let assert_sector = |index_in_bank: u8, start: u32, size: u32, address: u32| {
assert_eq!(
FlashSector {
bank: FlashBank::Bank1,
index_in_bank,
start,
size
},
get_sector(address, &FLASH_REGIONS)
)
};
assert_sector(0, 0x0800_0000, SMALL_SECTOR_SIZE, 0x0800_0000);
assert_sector(0, 0x0800_0000, SMALL_SECTOR_SIZE, 0x0800_3FFF);
assert_sector(3, 0x0800_C000, SMALL_SECTOR_SIZE, 0x0800_C000);
assert_sector(3, 0x0800_C000, SMALL_SECTOR_SIZE, 0x0800_FFFF);
assert_sector(4, 0x0801_0000, MEDIUM_SECTOR_SIZE, 0x0801_0000);
assert_sector(4, 0x0801_0000, MEDIUM_SECTOR_SIZE, 0x0801_FFFF);
assert_sector(5, 0x0802_0000, LARGE_SECTOR_SIZE, 0x0802_0000);
assert_sector(5, 0x0802_0000, LARGE_SECTOR_SIZE, 0x0803_FFFF);
assert_sector(7, 0x0806_0000, LARGE_SECTOR_SIZE, 0x0806_0000);
assert_sector(7, 0x0806_0000, LARGE_SECTOR_SIZE, 0x0807_FFFF);
}
#[test]
#[cfg(stm32f769)]
fn can_get_sector() {
const SMALL_SECTOR_SIZE: u32 = 32 * 1024;
const MEDIUM_SECTOR_SIZE: u32 = 128 * 1024;
const LARGE_SECTOR_SIZE: u32 = 256 * 1024;
let assert_sector = |index_in_bank: u8, start: u32, size: u32, address: u32| {
assert_eq!(
FlashSector {
bank: FlashBank::Bank1,
index_in_bank,
start,
size
},
get_sector(address, &FLASH_REGIONS)
)
};
assert_sector(0, 0x0800_0000, SMALL_SECTOR_SIZE, 0x0800_0000);
assert_sector(0, 0x0800_0000, SMALL_SECTOR_SIZE, 0x0800_7FFF);
assert_sector(3, 0x0801_8000, SMALL_SECTOR_SIZE, 0x0801_8000);
assert_sector(3, 0x0801_8000, SMALL_SECTOR_SIZE, 0x0801_FFFF);
assert_sector(4, 0x0802_0000, MEDIUM_SECTOR_SIZE, 0x0802_0000);
assert_sector(4, 0x0802_0000, MEDIUM_SECTOR_SIZE, 0x0803_FFFF);
assert_sector(5, 0x0804_0000, LARGE_SECTOR_SIZE, 0x0804_0000);
assert_sector(5, 0x0804_0000, LARGE_SECTOR_SIZE, 0x0807_FFFF);
assert_sector(7, 0x080C_0000, LARGE_SECTOR_SIZE, 0x080C_0000);
assert_sector(7, 0x080C_0000, LARGE_SECTOR_SIZE, 0x080F_FFFF);
}
}
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