/*
 * Created on: Jul 29, 2024
 *
 * routines for fucking around with built in flash memory.
 */

#include <stdint.h>
#include <ch32v20x.h>


// reads from flash in 32-bit mode
uint8_t flash_read(uint32_t *flash_addr, uint32_t *data, uint32_t len)
{
    uint32_t *addr = (uint32_t *)flash_addr;

    while (len >= 4) {
        *data++ = *addr++;
        len -= 4;
    }

    return 0;
}

// erases flash page, then writes 256-byte data buffer to flash page
// flash page must be at 256-byte boundary
uint8_t flash_write256(uint32_t *flash_addr, uint32_t *data)
{
    FLASH_Status s;

    // erase flash page
    s = FLASH_ROM_ERASE((uint32_t)flash_addr, 256);
    if (s != FLASH_COMPLETE) {
        return s;
    }

    s = FLASH_ROM_WRITE((uint32_t)flash_addr, data, 256);
    if (s != FLASH_COMPLETE) {
        return s;
    }

    return 0;
}