63 lines
1.6 KiB
Rust
63 lines
1.6 KiB
Rust
use log::error;
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use stm32f4xx_hal::{
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flash::{Error, FlashExt},
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pac::FLASH,
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};
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use sfkv::{Store, StoreBackend};
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// Last flash sector is used to avoid overwriting the code in flash.
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pub const FLASH_SECTOR: u8 = 11;
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pub const FLASH_SECTOR_11_OFFSET: u32 = 0xE0000;
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/// Only 16 KiB out of 128KiB in the Sector is used to save RAM
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pub const RESERVED_MEMORY: usize = 0x4000;
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static mut BACKUP_SPACE: [u8; RESERVED_MEMORY] = [0; RESERVED_MEMORY];
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pub struct FlashBackend {
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flash: FLASH,
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}
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fn get_offset() -> usize {
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FLASH_SECTOR_11_OFFSET as usize
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}
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impl StoreBackend for FlashBackend {
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type Data = [u8];
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fn data(&self) -> &Self::Data {
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&self.flash.read()[get_offset()..(get_offset() + RESERVED_MEMORY)]
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}
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type Error = Error;
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fn erase(&mut self) -> Result<(), Self::Error> {
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self.flash.unlocked().erase(FLASH_SECTOR)
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}
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fn program(&mut self, offset: usize, payload: &[u8]) -> Result<(), Self::Error> {
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self.flash.unlocked()
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.program(get_offset() + offset, payload.iter())
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}
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fn backup_space(&self) -> &'static mut [u8] {
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unsafe { BACKUP_SPACE.as_mut() }
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}
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}
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pub type FlashStore = Store<FlashBackend>;
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pub fn store(flash: FLASH) -> FlashStore {
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let backend = FlashBackend { flash };
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let mut store = FlashStore::new(backend);
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match store.get_bytes_used() {
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Ok(_) => {}
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Err(e) => {
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error!("corrupt store, erasing. error: {:?}", e);
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let _ = store.erase()
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.map_err(|e| error!("flash erase failed: {:?}", e));
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}
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}
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store
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}
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