Unexpected reset while flash erase

Hari

Other Parts Discussed in Thread: MSP430F5418

Hello,

I am using msp430f5418 with IAR EW 5.10.

I have a code fragment like this,

            char value = '0';
            int i = 0;
            char * Flash_ptr = (char *)0xf140;
            __disable_interrupt();
            while ((FCTL3 & BUSY) == BUSY);
            FCTL3 = FWKEY;                            // Clear Lock bit
            FCTL1 = FWKEY+ERASE;                      // Set Erase bit
            *Flash_ptr = 0;                           // Dummy write to erase Flash seg
            while ((FCTL3 & BUSY) == BUSY);
            FCTL1 = FWKEY+WRT;                        // Set WRT bit for write operation
            for (i = 0; i < 128; i++)
            {
                *Flash_ptr++ = value++;                 // Write value to flash
            }
            FCTL1 = FWKEY;                            // Clear WRT bit
            FCTL3 = FWKEY+LOCK;                       // Set LOCK bit
            __enable_interrupt();

It is executing correctly while running independently.

But when I added it into my real project, after the Dummy write to erase Flash seg the program is resetting.

I checked the value of SYSRSTIV Register, but it is zero.

I dont know what is wrong with it,

can anybody tell me what the reason is.....

Thanks

over 13 years ago

0 BasePointer over 13 years ago

Expert 1570 points

Write routine should be executed in RAM instead of flash. Maybe this is your problem.

0 Hari over 13 years ago in reply to BasePointer

Expert 1175 points

Thank you for your reply.

0 Jens-Michael Gross over 13 years ago

Guru 227245 points

The erase erases a complete segment, from 0xf000 to 0xf1ff. Are you sure you're not erasing your own flash write code?

Also, what about the watchdog timer? Is it disabled? The erase cycle takes quite some time.

0 milap patel over 13 years ago

Intellectual 805 points

Modify following lines.

unsigned int * Flash_ptr;
Flash_ptr = (unsigned int *)0xf140;

__disable_interrupt();

while(BUSY & FCTL3);

       FCTL3 = FWKEY;                            // Clear Lock bit
       FCTL1 = FWKEY+ERASE;                      // Set Erase bit
       *Flash_ptr = 0;                           // Dummy write to erase Flash seg
       while ((FCTL3 & BUSY) == BUSY);
       FCTL1 = FWKEY+WRT;                        // Set WRT bit for write operation
       for (i = 0; i < 128; i++)
       {
                *Flash_ptr++ = value++;                 // Write value to flash
       }
       FCTL1 = FWKEY;                            // Clear WRT bit
       FCTL3 = FWKEY+LOCK;                       // Set LOCK bit
       __enable_interrupt();

and tell me what about the watchdog Timer. It should be disable during the Flash write.

Milap

0 Hari over 13 years ago in reply to Jens-Michael Gross

Expert 1175 points

Actually my erase code was located at the same segment which I erased.

Thanks for pointing out the mistake.....

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Unexpected reset while flash erase