#include <avr/io.h>
#include <avr/interrupt.h>

#include "lights.h"

volatile uint16_t jiffies;
#define PATTERN_DIV 5	// clk/10
static unsigned char pattern_div;

void init_tmr()
{
	TCCR0A = _BV(WGM00);
	TCCR0B = _BV(CS02) | _BV(CS00); // CLK/1024 = 1 kHz
	OCR0A = 10; // 100 Hz
	TIMSK |= _BV(OCIE0A);

	jiffies = 0;
	pattern_div = PATTERN_DIV;
}

ISR(TIMER0_COMPA_vect)
{
	++jiffies;

	if (--pattern_div == 0) {
		timer_check_buttons();
		patterns_next_tick();
		pattern_div = PATTERN_DIV;
	}

	timer_start_adcs();
}