Posted on December 01, 2014 at 15:14
Hello,
I would like to store data in the DFLASH of my SPC560B. Therefore, I wrote the following function, according to the reference manual page 693:
void
DFO_WriteFlashDoubleWord(uint32_t dataWordHigh, uint32_t dataWordLow){
uint32_t tmp, status;
/* STEP 1 - UNLOCK FLASH REGION: BOTH REGISTERS LML and SLL have to be enabled*/
UnlockDFlash();
/* STEP2 - SELECT DESIRED OPERATION - double word program */
DFLASH.MCR.R = 0x00000010;
/* Set PGM in MCR: Select Operation */
/* STEP3 - DEFINITION OF OPERANDS: ADRESS AND DATA (double word data which should be write to flash) */
DFLASH_TARGET_PHASE_X = dataWordHigh;
/* Latch Address and 32 LSB data */
DFLASH_TARGET_PHASE_Y = dataWordLow;
/* Latch 32 MSB data */
/* STEP4 - START OPERATION */
DFLASH.MCR.R = 0x00000011;
/* Set EHV in MCR: Operation Start */
/* STEP5 - WAIT UNTIL PROCESS FINISHED */
do
{
tmp = DFLASH.MCR.R;
/* Read MCR */
}
while
( !(tmp & 0x00000400) );
//status = DFLASH.MCR.R & 0x00000200; /* Check PEG(Program/Erase Good) flag */
/* END OF OPERATION */
LockDFlash();
}
My function seems to have an error and I hope someone can tell me what I am doing wrong. With this function, I was able to write to an empty address of DFLASH at 0x00800000 and 0x00800 But sometimes, when I try to write a new value to the same addresses, the FLASH memory gets corrupted at theses adresses.
Means, when I reset the controller and start the software again, it always halts at a specific adress when I try to read the written DFLASH memory addresses. In that case, I have to perform a total flash erase and flash the software to the controller again.
Can anyone tell me what the error in my function is and how I can prevent the flash from getting corrupted during the write process?
Best regards,
Patrik
