Reading and Writing to the EEPROM in the PIC18 | PIC18 | Forum

void EEPROM_putc(unsigned char address, unsigned char data) {     static unsigned char GIE_Status; // Variable to save Global Interrupt Enable bit

    EEADR  = address;     EEDATA = data;

    EECON1bits.EEPGD= 0; // 0 = Access data EEPROM memory     EECON1bits.CFGS = 0; // 0 = Access Flash program or DATA EEPROM memory     EECON1bits.WREN = 1; // enable writes to internal EEPROM

    // Disable interrupts, Next two lines SHOULD run without interrupts     GIE_Status = INTCONbits.GIE; // Save the Global Interrupt Enable bit     INTCONbits.GIE = 0; // Disable global interrupts

    EECON2=0x55;        // Required sequence for write to internal EEPROM     EECON2=0xaa;        // Required sequence for write to internal EEPROM

    EECON1bits.WR = 1; // Required sequence to start the write cycle     INTCONbits.GIE = GIE_Status; // Restore the Global Interrupt Enable bit     EECON1bits.WREN = 0; // Disable EEPROM writes

    while (EECON1bits.WR); // Wait for the write cycle to complete

    if(EECON1bits.WRERR)     {         //printf("ERROR: writing to EEPROM failed!n");     }

    PIR2bits.EEIF=0; //Clear EEPROM write complete flag. (must be cleared in software. So we do it here) }

//This is the function which is used to read from the EEPROM. It takes the address of the character which you wish to read, and will return the value of the character.

unsigned char EEPROM_getc(unsigned char address)

{    

EEADR=address;    

EECON1bits.EEPGD= 0; // 0 = Access data EEPROM memory     EECON1bits.CFGS = 0; // 0 = Access Flash program or DATA EEPROM memory    

EECON1bits.RD   = 1; // EEPROM Read    

return(EEDATA);

}