been struggling to get flash segment to erase / write for a week :(

[jwsusa 0]

I do have a developer working with me, but he is away for a while, and I have been trying to resolved a flash issue we have been having. I am completely stumped.

 

Any thoughts would be welcomed.  All values being stored are integers. 

 

Using a 430g2553;

 

I can read flash just fine (we had loaded flash data onto the mcu much much earlier in the development path) - here is an example:

 

 

 int *pflash = ( int *) 0x1000; // pointer into data flash

 

settings.checkPumpTurnedOnDelay = *pflash++;

settings.pumpOnTestDelay = *pflash++;

settings.longSleepDelay = *pflash++;

settings.pressurePumpOn = *pflash++;

settings.minimumOperationalPressure = *pflash++;

settings.mode_led_sound = *pflash++; // BIT0 = single_mode, BIT1 = led, BIT2 = sound

settings.failed = *pflash++;

 

Of course I want to be able to store updated settings into flash......

 

We had been using a buffer arrangement, but had troubles with that. So I have reverted code back to very basic levels.

 

Firstly: erasing the segment: This should at least work, however it does not erase back to 1's. Each time the program runs it still retrieves the stored values from the load along time ago.

 

void prepareToWrite_Seg (int pointer)

{

volatile char *Flash_ptr; // Flash pointer

FCTL2 = FWKEY + FSSEL0 + FN3+ FN4; // MCLK/16 for Flash Timing Generator

Flash_ptr = (char *) pointer; // Initialize Flash pointer

FCTL1 = FWKEY + ERASE; // Set Erase bit

FCTL3 = FWKEY; // Clear Lock bit

*Flash_ptr = 0; // Dummy write to erase Flash segment

while((FCTL3 & BUSY));

FCTL3 = FWKEY + LOCK;

}

 

Then the operation to write values:

 

#define mFlashWriteEnable {while (FCTL3 & BUSY);FCTL1 = FWKEY;FCTL1 = FWKEY + WRT;}

// Set WRT bit for write operation

#define mFlashWriteDisable {while (FCTL3 & BUSY);FCTL1 = FWKEY +LOCK;}

// disable write operation

 

 

int *Flash_ptr;

prepareToWrite_Seg (0xFC00);

Flash_ptr=(int *)0xFC00;

mFlashWriteEnable;

 

*Flash_ptr++ = settings.checkPumpTurnedOnDelay;

*Flash_ptr++ = settings.pumpOnTestDelay;

*Flash_ptr++ = settings.longSleepDelay;

*Flash_ptr++ = settings.pressurePumpOn;

*Flash_ptr++ = settings.minimumOperationalPressure;

*Flash_ptr++ = settings.mode_led_sound; // BIT0 = single_mode, BIT1 = led, BIT2 = sound

*Flash_ptr++ = settings.failed;

mFlashWriteDisable;

 

 

 

 

 

.

 

 

 

 

[RobG 1,892]

Maybe example below will help

 

http://www.forum.43oh.com/index.php?/topic/412-Saving-data-to-flash-on-power-down/page__view__findpost__p__3669