#include <xc.h>
#define _XTAL_FREQ 4000000 // 4MHz crystal
 
// Configuration bits
#pragma config FOSC = HS   // High-speed oscillator
#pragma config WDTE = OFF  // Watchdog timer off
#pragma config PWRTE = OFF // Power-up timer off
#pragma config BOREN = OFF // Brown-out reset off
#pragma config LVP = OFF   // Low-voltage programming off
#pragma config CPD = OFF   // Data EEPROM code protection off
#pragma config WRT = OFF   // Flash program memory write off
#pragma config CP = OFF    // Flash program memory code protection off
 
void UART_Init() {
    TXSTA = 0x24; // Enable TX, high speed
    RCSTA = 0x90; // Enable serial port, continuous receive
    SPBRG = 25;   // Baud rate 9600 for 4MHz crystal
}
 
void UART_Write(char data) {
    while(!TRMT); // Wait for transmit shift register to be empty
    TXREG = data; // Write data to TX register
}
 
void UART_Write_Text(char *text) {
    while(*text) {
        UART_Write(*text++);
    }
}
 
void main() {
    TRISB = 0x01; // RB0 input (button), RB1 output (LED)
    PORTB = 0x00; // Clear PORTB
    UART_Init();  // Initialize UART
 
    while(1) {
        if(RB0 == 1) { // Button pressed
            RB1 = 1;   // Turn on LED (simulate shutter)
            UART_Write_Text("PHOTO_CLICKED\n"); // Send signal
            __delay_ms(500); // Simulate shutter duration
            RB1 = 0;   // Turn off LED
            __delay_ms(500); // Debounce
        }
    }
}

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