/*Flash memory pointer*/
#define FLASH_PARAM_ADDR     0x0FE00000

memcpy(&flashParam, (uint32_t*)FLASH_PARAM_ADDR, sizeof (struct sFlashParam));

WDOG_Enable (false); // Disable of the watchdog.
// For to be on the safe side.
MSC->LOCK = MSC_UNLOCK_CODE; // Unlock of the FLASH writting.
MSC-> WRITECTRL |= MSC_WRITECTRL_WREN; // Set enable of the FLASH writting.
MSC -> ADDRB = USERDATA_BASE; // Set of the FLASH User memory address.
MSC -> WRITECMD = MSC_WRITECMD_LADDRIM; // Write addres to MSC hardware.
MSC -> WRITECMD = MSC_WRITECMD_ERASEPAGE; // Command to erase of the first User FLASH page. !!!

// !!! If I comment of the previous line the microcontroller works, otherwize it rebooted.

// Wait for the FLASH erase process end.

i = 0;
while (((MSC -> STATUS & MSC_STATUS_BUSY) == MSC_STATUS_BUSY) && (i < 100000))
{
i++;
}

...

// Write of the CKS.

MSC -> ADDRB = FLASH_Addr; // Set of the FLASH User memory address.
FLASH_Addr = FLASH_Addr + 4; // Increment of the FLASH Address.
MSC -> WDATA = CKS; // Write of the dara to FLASH write.
MSC -> WRITECMD = MSC_WRITECMD_LADDRIM; // Write addres to hardware.
MSC -> WRITECMD = MSC_WRITECMD_WRITEONCE; // Command to write of the one word.

// !!! If I comment of the previous line the microcontroller works, otherwize it rebooted.


i = 0;
while (((MSC -> STATUS & MSC_STATUS_BUSY) == MSC_STATUS_BUSY) && (i < 100000))
{
i++;
}
MSC-> WRITECTRL &= ~MSC_WRITECTRL_WREN; // Disable of the FLASH writting.
MSC->LOCK = 0x0; // Lock of the FLASH writting.

WDOG_Enable (true); // Enable of the watchdog.
WDOG_Feed(); // Reset of the Watchdog.

#include "em_msc.h"

void WriteToFlash(uint32_t address, uint32_t *data, uint32_t size)
{
    uint32_t *addr = (uint32_t *) address;
    MSC_Init();
    MSC_ErasePage(addr);
    MSC_WriteWord(addr, data, size);
    MSC_Deinit();
}