MSP430FR5994 Mass Erase

mass_erase.c

/*
 * This function mass-erases a MSP430FR5994 in about 3 seconds.  It wipes the entirety of FRAM, losing all data.
 * It is intended for use in tamper-resiliency applications, and runs from RAM to avoid issues with self-erasing.
 * After the function completes, it will force a reset by writing an invalid value to the watchdog register.
 * This code is intended for use with Code Composer Studio, and will need to be adapted to be compatable with Kiel,
 * Rowley, or IAR.
 */

#include <stdio.h>
#include <msp430.h> 

__attribute__((ramfunc))
 void self_destruct(void) {
     uint32_t addr;

     // Disable the MPU and make everything writable
     MPUCTL0 = MPUPW;
     MPUSAM = (MPUSEG1WE | MPUSEG2WE | MPUSEG3WE | MPUSEG1RE | MPUSEG2RE | MPUSEG3RE | MPUSEG1XE | MPUSEG2XE | MPUSEG3XE);

     // Disable interrupts (except for the reset interrupt) and clear their vectors
     __disable_interrupt();
     for (addr = EUSCI_A3_VECTOR ; addr <= SYSNMI_VECTOR; addr += 2)
     {
         __data20_write_short(addr, 0xFFFF);
     }

     // Wipe FRAM
     for (addr = FRAM_START; addr < FRAM_START + FRAM_LENGTH; addr += 4) {
         __data20_write_long(addr, 0xFFFFFFFF);
     }

     // Force a reset
     WDTCTL = 0xDEAD;
 }