Hello,
I'm trying to reserve a large uint8_t array segment in MSP430FR2633 FRAM to keep data in it available if the device was to be power cycled.
1- I declared the array in FRAM using #pragma Persistent
// Statically-initialized variable
#ifdef __TI_COMPILER_VERSION__
#pragma PERSISTENT(Array_Placeholder)
uint8_t Array_Placeholder[2000] = {0xFF};
#elif __IAR_SYSTEMS_ICC__
__persistent uint8_t Array_Placeholder[2000] = {0xFF};
#endif
2- I created a pointer to this array
uint8_t *FRAM_write_ptr;
int main(void) {
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
initClockTo16MHz();
FRAM_write_ptr = Array_Placeholder; // Set FRAM_write_ptr to START location
__bis_SR_register(LPM0_bits + GIE);
return 0;
}
3- My write procedure follows one of TI's reference examples:
__disable_interrupt(); // disable interrupts
SYSCFG0 = FRWPPW | PFWP; // Program FRAM write enable
for (count = 0; count < 10; count++)
{
*(FRAM_write_ptr + count) = dataToBeWritten[count+6];
}
SYSCFG0 = FRWPPW | PFWP | DFWP; // Program FRAM write protected (not writable)
__enable_interrupt(); // enable interrupts
The Problem is no matter what I write, the values in Array_Placeholder don't change. What's the problem?
