#include <xc.h>
#define _XTAL_FREQ 4000000
 
// LCD bağlantıları
#define RS RC0
#define E  RC1
#define D4 RC2
#define D5 RC3
#define D6 RC4
#define D7 RC5
 
// Sayaç değişkenleri
unsigned int sayac = 0;
unsigned int kesme_sayisi = 0;
 
// LCD fonksiyon prototipleri
void lcd_init();
void lcd_cmd(char cmd);
void lcd_yaz(char data);
void lcd_yaz_str(const char* str);
void lcd_gotoxy(char x, char y);
void lcd_clear();
 
// Interrupt yapılandırması
void interrupt ISR() {
    if (TMR0IF) {
        TMR0IF = 0;
        TMR0 = 131; // 500 µs için TMR0 değeri (prescaler 1:4)
 
        RB0 = !RB0; // Osiloskop sinyali
 
        kesme_sayisi++;
        if (kesme_sayisi >= 1000) { // 500 ms tamamlandı
            kesme_sayisi = 0;
            sayac++;
            if (sayac > 99) sayac = 0;
 
            lcd_gotoxy(0, 1);
            lcd_yaz_str("SAYAC: ");
            lcd_yaz((sayac / 10) + '0');
            lcd_yaz((sayac % 10) + '0');
        }
    }
}
 
void timer0_init() {
    OPTION_REG = 0b00000001; // Prescaler 1:4 (PS2:PS0 = 001)
    TMR0 = 131;
    INTCON = 0b10100000; // GIE ve TMR0IE aktif
}
 
void main() {
    TRISB0 = 0; // RB0 çıkış
    TRISC = 0;  // LCD pinleri çıkış
 
    lcd_init();
    timer0_init();
 
    // Açılış ekranı
    lcd_gotoxy(0, 0);
    lcd_yaz_str("YUNUS EMRE NAS");
    lcd_gotoxy(0, 1);
    lcd_yaz_str("G210101037");
    __delay_ms(3000);
 
    lcd_clear();
    lcd_gotoxy(3, 0);
    lcd_yaz_str("SUBU EEM");
    lcd_gotoxy(0, 1);
    lcd_yaz_str("SAYAC: 00");
 
    while (1) {
        // İşlem kesmede yapılır
    }
}
 

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