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flash_store: get addresses from linker 

Reviewed-on: M-Labs/thermostat#49
Co-Authored-By: topquark12 <aw@m-labs.hk>
Co-Committed-By: topquark12 <aw@m-labs.hk>
This commit is contained in:
topquark12 2021-01-13 17:30:12 +08:00 committed by sb10q
parent f6802635a4
commit cf3ace4d2d
2 changed files with 17 additions and 5 deletions
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4
memory.x
View File

@ -11,5 +11,7 @@ MEMORY
CCMRAM (rw) : ORIGIN = 0x10000000, LENGTH = 64K
}
_stack_start = ORIGIN(CCMRAM) + LENGTH(CCMRAM);
_flash_start = ORIGIN(FLASH);
_config_start = ORIGIN(CONFIG);
_dfu_msg = ORIGIN(DFU_MSG);
_stack_start = ORIGIN(CCMRAM) + LENGTH(CCMRAM);

18
src/flash_store.rs
View File

@ -8,18 +8,29 @@ 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];
extern "C" {
// These are from memory.x
static _config_start: usize;
static _flash_start: usize;
}
pub struct FlashBackend {
flash: FLASH,
}
fn get_offset() -> usize {
unsafe {
(&_config_start as *const usize as usize) - (&_flash_start as *const usize as usize)
}
}
impl StoreBackend for FlashBackend {
type Data = [u8];
fn data(&self) -> &Self::Data {
&self.flash.read()[FLASH_SECTOR_OFFSET..(FLASH_SECTOR_OFFSET + FLASH_SECTOR_SIZE)]
&self.flash.read()[get_offset()..(get_offset() + FLASH_SECTOR_SIZE)]
}
type Error = Error;
@ -30,10 +41,9 @@ impl StoreBackend for FlashBackend {
fn program(&mut self, offset: usize, payload: &[u8]) -> Result<(), Self::Error> {
self.flash.unlocked()
.program(FLASH_SECTOR_OFFSET + offset, payload.iter().cloned())
.program(get_offset() + offset, payload.iter().cloned())
}
fn backup_space(&self) -> &'static mut [u8] {
unsafe { &mut BACKUP_SPACE }
}