void write_to_flash (void)    {
BYTE i;

    iap_copy_to_flash((uint8_t *)display_address, OFFSET_ADDRESS, 1); //warning here
    delay_1_ms();
    iap_copy_to_flash((uint8_t *)version, OFFSET_VERSION, 1); //warning here
    delay_1_ms();
    for (i=0;i<8;i++)     {
        iap_copy_to_flash((uint8_t *)serial_no[i], OFFSET_VERSION+i, 1); //warning here
        delay_1_ms();
        }
    }

void iap_copy_to_flash (uint8_t* buff, uint32_t flash_addr, uint32_t num_bytes)