#include "config.h"
#include "ch32v30x_flash.h"

PersistentData_t persistent;

void loadConfig() {
    memcpy (&persistent, FLASH_USER_PAGE_ADDR, sizeof (persistent));
    uint32_t crcSum = *((uint32_t *)(((uint8_t *)&persistent) + (sizeof (persistent) - 2)));
    memset ((((uint8_t *)&persistent) + (sizeof (persistent) - sizeof(crcSum))), 0, 4);
    CRC_ResetDR();
    uint32_t currentSum = CRC_CalcBlockCRC ((uint32_t *)&persistent, sizeof (persistent) - 2);

    if (currentSum != crcSum) {
        memset (&persistent, 0, sizeof (persistent));
    }
}

void saveConfig() {
    CRC_ResetDR();
    uint32_t currentSum = CRC_CalcBlockCRC ((uint32_t *)&persistent, sizeof (persistent) - 2);
    memcpy ((((uint8_t *)&persistent) + (sizeof (persistent) - sizeof(currentSum))), (uint8_t *)currentSum, 4);
    FLASH_Unlock();
    FLASH_ErasePage_Fast (1919);
    FLASH_ProgramPage_Fast (1919, (uint32_t *)&persistent);
    FLASH_Lock();
}