MSP430F5xxx infomem flash example

dmx512.c

#include <msp430.h>
#include <stdint.h>
#include "flash.h"


#define SEG_INFOB __attribute__((section(".infob")))
#define DMX_PASSWORD_VALID ((uint16_t) 0xFEF5)

uint16_t SEG_INFOB _dmx_password = 0x0505;
uint16_t SEG_INFOB _dmx_red = 0x00FF;
uint16_t SEG_INFOB _dmx_green = 0x0050;
uint16_t SEG_INFOB _dmx_blue = 0x0080;

volatile uint16_t flash_erase_err, flash_unlock_err;

int dmx512_flash_load(uint8_t startcode)
{
        if (startcode != DMX512_STARTCODE)
                return -1;

        if (_dmx_password != DMX_PASSWORD_VALID)
                return -1;

        dmx512_buffer[0] = (uint8_t) _dmx_red;
        dmx512_buffer[1] = (uint8_t) _dmx_green;
        dmx512_buffer[2] = (uint8_t) _dmx_blue;

        dmx512_update_commit(startcode);  // this sets WS2811 LEDs to the values in dmx512_buffer[]

        return 0;
}

volatile uint16_t flash_erase_err, flash_unlock_err;

void dmx512_flash_commit(uint8_t startcode)
{
        if (startcode != DMX512_STARTCODE)
                return;

        if (!flash_erase_info((void *)&_dmx_password)) {
                if (!flash_write_unlock()) {
                        flash_write_word((void *)&_dmx_password, DMX_PASSWORD_VALID);
                        flash_write_word((void *)&_dmx_red, (uint16_t)dmx512_buffer[0]);
                        flash_write_word((void *)&_dmx_green, (uint16_t)dmx512_buffer[1]);
                        flash_write_word((void *)&_dmx_blue, (uint16_t)dmx512_buffer[2]);
                        flash_write_lock();
                        return;
                } else {
                        flash_unlock_err++;
                }
        } else {
                flash_erase_err++;
        }
        return;
}