MSP430F5529: How to retain data in flash memory while reprogramming

Hi team,

Here's a follow up question:

This customer has an error when trying to write data to flash, and the probability of recurrence is 100%.

He refers to the demo MSP430F55xx_flashwrite_01.c, and below is his code.

#include <msp430f5529.h>

char value;                                 // 8-bit value to write to seg C

// Function prototypes
void write_BankA(char value);
void copy_C2D(void);

int main(void)
{
  WDTCTL = WDTPW+WDTHOLD;                   // Stop WDT
  value = 1;                                // initialize value

    write_BankA(value++);                    // Write Bank A, increment value
//    copy_C2D();                             // Copy segment C to D
    __no_operation();                       // Loop forever, SET BREAKPOINT HERE
  
  while(1);
}

//------------------------------------------------------------------------------
// Input = value, holds value to write to Bank A
//------------------------------------------------------------------------------
void write_BankA(char value)
{
  unsigned int i;
  char * Flash_ptr;                         // Initialize Flash pointer
  Flash_ptr = (char *) 0x4400;            // Bank A address
  FCTL3 = FWKEY;                            // Clear Lock bit
  FCTL1 = FWKEY+ERASE;                      // Set Erase bit
  _DINT();                                  //no interrupt
  *Flash_ptr = 0;                           // Dummy write to erase Flash seg
  FCTL1 = FWKEY+WRT;                        // Set WRT bit for write operation

  for (i = 0; i < 128; i++)
  {
    *Flash_ptr++ = value;                   // Write value to flash
  }
  while(FCTL3 & BUSY);
  _EINT();
  FCTL1 = FWKEY;                            // Clear WRT bit
  FCTL3 = FWKEY+LOCK;                       // Set LOCK bit
}

Steps to reproduce
1. Compile the code in IAR
2. Download and debug
3. Press Go, then an error is reported

Error screenshot

Environment & Platform

windows10+IAR 7.12.1+MSP-EXP430F5529LP-V1.8

Hi Yale

Sorry for the late response.

Yes, customer can keep the data if they know where the data located and try to change the memory manage file like cmd for CCS to avoid put code or data in those area.  

Have you change the debug driver from Simulator to FET Debugger?

Hi Gary

Thanks for your answer.

I asked the customer, and he used the eZ-FET lite on the board.

I just noticed that the 2nd screenshot is not clear, here's the clear one. Sorry for that.

Could you upload the project here let me check about the project configuration?

Hi Gary

Here's the project.

flash_write01

Flash_Write.zip

Thanks for your help, Gary.

And sorry for this late confirmation.