pic16f877-EEPROM-Configuration&MainLoop

#include <xc.h>

// Configuration bits: Adjust these according to your specific needs
#pragma config FOSC = XT        // Oscillator Selection bits (XT oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON       // Power-up Timer Enable bit (PWRT enabled)
#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF        // Low-Voltage Programming Enable (RB3 is digital I/O)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection (off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable (off)
#pragma config CP = OFF         // Flash Program Memory Code Protection (off)

#define _XTAL_FREQ 4000000      // Assume 4MHz crystal frequency

// Function prototypes
void EEPROM_Write(unsigned char address, unsigned char data);
unsigned char EEPROM_Read(unsigned char address);

void main() {
    // Set up the ports
    ADCON1 = 0x06;  // Configure all pins as digital I/O
    TRISB = 0x00;   // Set PORTB as output (for red LEDs)
    TRISD = 0x00;   // Set PORTD as output (for green LEDs)
    TRISA = 0xFF;   // Set PORTA as input (for button)

    PORTB = 0;      // Initialize PORTB
    PORTD = 0;      // Initialize PORTD
    
    // Read initial value from EEPROM and display on PORTD
    PORTD = EEPROM_Read(5);  // Read from EEPROM at address 5

    while(1) {
        PORTB++;            // Increment PORTB value (light up red LEDs)
        __delay_ms(100);    // 100ms delay
        
        // Check if MEMO button (RA2) is pressed
        if (PORTAbits.RA2) {  
            EEPROM_Write(5, PORTB);  // Write current PORTB value to EEPROM
            PORTD = EEPROM_Read(5);  // Read the value back and display on PORTD
            
            // Wait for button release to avoid multiple writes
            while(PORTAbits.RA2);    // Wait for button release
            __delay_ms(20);          // Simple debounce
        }
    }
}