on.c


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#define __AVR_ATmega328P__
#include <avr/io.h>
#define F_CPU 16000000UL
#include <util/delay.h>

typedef enum { false, true } bool;

typedef enum { INSTRUCTION, DATA = 2 } regselect;
typedef enum { WRITE, READ } readwrite;

static void setregrw(regselect reg, readwrite rw){
    PORTC = (PORTC & ~3) | reg | rw;
}

#define enablepin(val) val ? (PORTC |= 4) : (PORTC &= ~4);

static void wdata(uint8_t data){
    DDRD |= 0xF0;
    enablepin(true);
    PORTD = data;
    __asm__ ("nop;");
    enablepin(false);
}

int main(){
    DDRC = 0x07;
    DDRD = 0x08;
    //PORTD = 0x08;
    _delay_ms(10000);
    return 0;
}