flashctl_ex1_infoSegmentWrite.c

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/*******************************************************************************
 * MSP430i20xx Flash - Flash In-System Programming, Information Segment
 *
 * Description: Unlock the Information Segment, overwrite a number of values
 * within it, then re-lock the Information Segment when writes are complete.
 * Set breakpoint on NOP in main loop to avoid stressing flash. DO NOT ERASE
 * ENTIRE INFORMATION SEGMENT, important values (TLV, etc) are contained
 * within this segment.
 *
 *                MSP430i20xx
 *             -----------------
 *         /|\|                |
 *          | |                |
 *          --|RST             |
 *            |                |
 *            |                |
 *            |                |
 *
 * Author: Yang Lu
 ******************************************************************************/
#include "driverlib.h"
 
// Address of the beginning of the Flash Information Segment
#define SEGSTART 0x1060
// Number of bytes within segment to write
#define SEG_LEN 16
 
// Value to write to segment
const uint32_t Value = 0xBEEFDEAD;
 
void write_InfoSeg(uint32_t value);
 
void main(void) {
 
    // Pointer to beginning of Flash segment
    uint32_t *flashPtr = (uint32_t *)SEGSTART;
 
    // Stop WDT
    WDT_hold(WDT_BASE);
 
    // Setting the DCO to use the internal resistor. DCO will be at 16.384MHz
    CS_setupDCO(CS_INTERNAL_RESISTOR);
 
    // Setting MCLK to DCO / 1. MCLK = 16.384MHz.
    CS_initClockSignal(CS_MCLK, CS_CLOCK_DIVIDER_1);
 
    // MCLK for Flash Timing Generator
    // Flash clock will run at ~390kHz. Datasheet recommends 257kHz - 476kHz
    FlashCtl_setupClock(390095, 16384000, FLASHCTL_MCLK);
 
    FlashCtl_unlockInfo();
    FlashCtl_fillMemory32(Value, flashPtr, SEG_LEN / 4);
    FlashCtl_lockInfo();
 
    while(1) {
        // Set breakpoint to view memory
        __no_operation();
    }
}