#include "scroll_text.h"
#include <avr/interrupt.h>
#include "scan_led.h"

unsigned char start_col=0;

void init_timer1() {
	TCCR1A = 0x00;
	TCCR1B = 0x4C;
	OCR1AH = 0x3D;	// 0x3D09 = 15625 ticks * 256 = 4000000 ticks per interrupt (1/2 second)
	OCR1AL = 0x09;	//
	
	TIMSK |= 0x40;
}

unsigned char get_start_col() {
	return start_col;
}

ISR(TIMER1_COMPA_vect){
	start_col++;
	if(start_col == COLS) start_col=0;
}