thermostat/src/flash_store.rs

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1.1 KiB
Rust
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use stm32f4xx_hal::{
flash::{Error, FlashExt},
stm32::FLASH,
};
use sfkv::{Store, StoreBackend};
/// 16 KiB
pub const FLASH_SECTOR_SIZE: usize = 0x4000;
pub const FLASH_SECTOR: u8 = 12;
pub const FLASH_SECTOR_OFFSET: usize = 0x10_0000;
static mut BACKUP_SPACE: [u8; FLASH_SECTOR_SIZE] = [0; FLASH_SECTOR_SIZE];
pub struct FlashBackend {
flash: FLASH,
}
impl StoreBackend for FlashBackend {
type Data = [u8];
fn data(&self) -> &Self::Data {
self.flash.read()
}
type Error = Error;
fn erase(&mut self) -> Result<(), Self::Error> {
self.flash.unlocked().erase(FLASH_SECTOR)
}
fn program(&mut self, offset: usize, payload: &[u8]) -> Result<(), Self::Error> {
self.flash.unlocked()
.program(FLASH_SECTOR_OFFSET + offset, payload.iter().cloned())
}
fn backup_space(&self) -> &'static mut [u8] {
unsafe { &mut BACKUP_SPACE }
}
}
pub type FlashStore = Store<FlashBackend>;
pub fn store(flash: FLASH) -> FlashStore {
let backend = FlashBackend { flash };
FlashStore::new(backend)
}