msp430fr413x_framwrite.c

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//******************************************************************************
//   MSP430FR413x Demo - Long word writes to FRAM
//
//   Description: Use long word write to write to 512 byte blocks of FRAM.
//   Toggle LED after every 100 writes.
//   NOTE: Running this example for extended periods will impact the FRAM
//   endurance.
//   ACLK = REFO, MCLK = SMCLK = default DCODIV = ~1MHz
//
//           MSP430FR4133
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//        |          P1.0 |---> LED
//
//   Cen Fang
//   Texas Instruments Inc.
//   August 2013
//   Built with IAR Embedded Workbench v5.60 & Code Composer Studio v5.5
//******************************************************************************
#include <msp430.h>

void FRAMWrite(void);

unsigned char count = 0;
unsigned long *FRAM_write_ptr;
unsigned long data;

#define FRAM_TEST_START 0x1800


int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer

    P1OUT &= ~BIT0;                         // Clear P1.0 output latch for a defined power-on state
    P1DIR |= BIT0;                          // Set P1.0 to output directionOUT

    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings
    data = 0x11111111;                      // Initialize dummy data

    while(1)
    {
        data += 0x00010001;
        FRAM_write_ptr = (unsigned long *)FRAM_TEST_START;
        FRAMWrite();
        count++;
        if (count > 100)
        {
            P1OUT ^= 0x01;                  // Toggle LED to show 512K bytes
            count = 0;                      // ..have been written
            data = 0x11111111;
        }
    }
}

void FRAMWrite (void)
{
    unsigned int i=0;

    SYSCFG0 &= ~DFWP;
    for (i = 0; i < 128; i++)
    {
        *FRAM_write_ptr++ = data;
    }
    SYSCFG0 |= DFWP;
}