请教一下写用户ID的指令

static void eraseUserID(uint32_t addr)

{

    uint8_t GIEBitValue = INTCONbits.GIE;     // Save interrupt enable



    TBLPTRU = (uint8_t) ((addr >> 16) & 0xff);

    TBLPTRH = (uint8_t) ((addr >> 8) & 0xff);

    TBLPTRL = (uint8_t) (addr & 0xff);    

    

    EECON1bits.FREE = 1;

    

    EECON1bits.EEPGD = 1;

    EECON1bits.CFGS = 0;

    EECON1bits.WREN = 1;

    

    INTCONbits.GIE = 0; // Disable interrupts

    EECON2 = 0x55;

    EECON2 = 0xAA;

    EECON1bits.WR = 1;  // Erase like the wind!

    INTCONbits.GIE = GIEBitValue;   // Restore interrupt enable

    EECON1bits.WREN = 0;    // Disable writes to memory    

}



static void writeUserID(uint8_t *flashWrBufPtr)

{

    int i;

    uint8_t GIEBitValue = INTCONbits.GIE;     // Save interrupt enable





    TBLPTRU = (uint8_t) 0x20;

    TBLPTRH = (uint8_t) 0;

    TBLPTRL = (uint8_t) 0;  

        

    // Write 3 bytes which uses 6 LOC cells (1 nibble each).



    TABLAT = (flashWrBufPtr[0] >> 4);

    asm("TBLWT*+");

    TABLAT = (flashWrBufPtr[0] & 0x0f);

    asm("TBLWT*+");

    TABLAT = (flashWrBufPtr[1] >> 4);

    asm("TBLWT*+");

    TABLAT = (flashWrBufPtr[1] & 0x0f);

    asm("TBLWT*+");

    TABLAT = (flashWrBufPtr[2] >> 4);

    asm("TBLWT*+");

    TABLAT = (flashWrBufPtr[2] & 0x0f);

    asm("TBLWT*");

   

    TBLPTRU = (uint8_t) 0x20;

    TBLPTRH = (uint8_t) 0;

    TBLPTRL = (uint8_t) 0;  

    

    EECON1bits.EEPGD = 1;

    EECON1bits.CFGS = 0;

    EECON1bits.WREN = 1;

    

    INTCONbits.GIE = 0; // Disable interrupts

    EECON2 = 0x55;

    EECON2 = 0xAA;

    EECON1bits.WR = 1;  // Write like the wind!

    INTCONbits.GIE = GIEBitValue;   // Restore interrupt enable

    EECON1bits.WREN = 0;    // Disable writes to memory    

}