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#ifndef CONFIGLOADER_H
#define CONFIGLOADER_H
#include <rcc/flash.h>
#include <string.h>
class Configloader {
private:
enum {
MAGIC = 0xc0ff600d,
};
struct header_t {
uint32_t magic;
uint32_t size;
};
uint32_t flash_addr;
public:
Configloader(uint32_t addr) : flash_addr(addr) {}
bool read(uint32_t size, void* data) {
header_t* header = (header_t*)flash_addr;
if(header->magic != MAGIC) {
return false;
}
if(header->size < size) {
size = header->size;
}
memcpy(data, (void*)(flash_addr + sizeof(header_t)), size);
return true;
}
bool write(uint32_t size, void* data) {
header_t header = {MAGIC, size};
// Unlock flash.
FLASH.KEYR = 0x45670123;
FLASH.KEYR = 0xCDEF89AB;
// Erase page.
FLASH.CR = 1 << 1; // PER
FLASH.AR = flash_addr;
FLASH.CR = (1 << 6) | (1 << 1); // STRT, PER
while(FLASH.SR & (1 << 0)); // BSY
FLASH.SR &= ~(1 << 5); // EOP
FLASH.CR = 0;
// Write header.
uint16_t* src = (uint16_t*)&header;
uint16_t* dest = (uint16_t*)flash_addr;
for(uint32_t n = 0; n < sizeof(header); n += 2) {
FLASH.CR = 1 << 0; // PG
*dest++ = *src++;
while(FLASH.SR & (1 << 0)); // BSY
}
// Write data.
src = (uint16_t*)data;
for(uint32_t n = 0; n < size; n += 2) {
FLASH.CR = 1 << 0; // PG
*dest++ = *src++;
while(FLASH.SR & (1 << 0)); // BSY
}
// Lock flash.
FLASH.CR = 1 << 7; // LOCK
return true;
}
};
#endif
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