#include <avr/io.h>
#include <avr/eeprom.h>
#include <util/delay.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>

uint16_t pwmee EEMEM;

int main(void)
{
	char seen = 0;

	TCCR1C = _BV(COM1D0) | _BV(COM1D1) | _BV(PWM1D);
	TCCR1A = _BV(PWM1A) | _BV(PWM1B);
	TCCR1B = 0x80| _BV(CS13) | _BV(CS11);
	TC1H  = 0x03;
	OCR1C = 0xFF;
	OCR1D = 0x20;
	TCNT1 = 0;
	DDRB |= _BV( PB5 );
	PORTB &= ~_BV( PB5 );

	ADCSRA = _BV(ADEN) | _BV(ADATE) | _BV(ADPS1) | _BV(ADPS0);
	ADMUX = _BV(REFS1) | _BV(MUX0);
	// ADCSRB = _BV(REFS2); 
	DIDR0 = _BV(ADC1D) | _BV(AREFD);

	while (1) {
		uint16_t pwm;
		unsigned char pwmhi, pwmlo;

		ADCSRA |= _BV(ADSC);

		_delay_ms(100);

		pwm = ADCW;
		if (!seen) {
			seen = 1;
			eeprom_write_word(&pwmee, pwm);
		}
		if (pwm > 0x3C0)
			pwm = 0x3C0;
		if (pwm < 1)
			pwm = 1;
		pwmhi = pwm >> 8;
		pwmlo = pwm & 0xFF;

		TC1H = pwmhi;
		OCR1D = pwmlo;
	}

	sleep_mode();
    DDRA |= _BV( PA0 );
    while( 1 ) { 
        PORTA |=  _BV( PA0 );
        _delay_ms(2000);
        PORTA &=~ _BV( PA0 );
        _delay_ms(2000);
    }
}