46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
use stm32f4xx_hal::{
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flash::{Error, FlashExt},
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stm32::FLASH,
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};
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use sfkv::{Store, StoreBackend};
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/// 16 KiB
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pub const FLASH_SECTOR_SIZE: usize = 0x4000;
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pub const FLASH_SECTOR: u8 = 12;
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pub const FLASH_SECTOR_OFFSET: usize = 0x10_0000;
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static mut BACKUP_SPACE: [u8; FLASH_SECTOR_SIZE] = [0; FLASH_SECTOR_SIZE];
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pub struct FlashBackend {
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flash: FLASH,
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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()
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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(FLASH_SECTOR_OFFSET + offset, payload.iter().cloned())
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}
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fn backup_space(&self) -> &'static mut [u8] {
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unsafe { &mut BACKUP_SPACE }
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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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FlashStore::new(backend)
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}
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