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/*
Bike brake and night backlight with attiny25, 5 leds, brakes button and on/off sliding switch
*/
#include <avr\io.h>
#include <avr\interrupt.h>
#include <avr\sleep.h>
#include <avr\power.h>

#define F_CPU 1000000UL  // Int. RC Osc. 8 MHz / CKDIV 8 = 1 000 000 MHz

#define R_LEDS PB4 //right leds	(PIN # 3 on tiny25)	from PB4 to right leds, then via R 56 Ohm to GND
#define L_LEDS PB1 //left leds	(PIN # 6 on tiny25)	from PB1 to left leds, then via R 56 Ohm to GND
#define M_LEDS PB0 //middle led	(PIN # 5 on tiny25)	from PB0 to middle led, then via R 56 Ohm to GND
#define BRAKES PB3 //brakes pin	(PIN # 2 on tiny25)	from PB3 to brakes button, then to GND
#define SWITCH PB2 //on switch	(PIN # 7 on tiny25)	from PB2 to to GND via switch

#define LEDS_ON PORTB |= _BV( R_LEDS ); PORTB |= _BV( L_LEDS ); PORTB |= _BV( M_LEDS );
#define LEDS_OFF PORTB &=~ _BV( R_LEDS ); PORTB &=~ _BV( L_LEDS ); PORTB &=~ _BV( M_LEDS );

uint8_t flag;
uint8_t counter;
uint8_t limit = 0;

// signal handler for timer interrupt TOV0
ISR(TIMER0_OVF_vect) {
	//blinking routine
	if ((PINB & (1 << BRAKES))) {	//if brakes switch is off
		limit = 10;		//blinking pause is longer
	} else {
		limit = 1;			//set pause shorter
	}
	if ((PINB & (1 << SWITCH))) {	//if switch is off
		flag = 0;			//long blinking
	} else {
		flag = 1;			//shorter
	}
	counter++;
	if ((limit == 10 ) && (flag == 0)) {
	    LEDS_OFF
		return;			//if switch is off and brakes is not on - do nothing
	}
	if (counter > limit) {		//switch leds on
		LEDS_ON
		counter = 0;		//and reset counter
	} else {
        LEDS_OFF
	}
}

int main(void) {
					//PortB settings:
	DDRB |= _BV( R_LEDS );		//output
	DDRB |= _BV( L_LEDS );
	DDRB |= _BV( M_LEDS );
	DDRB &=~ _BV( BRAKES );		//input
	DDRB &=~ _BV( SWITCH );
	PORTB |= _BV( BRAKES );		//pull-up resistor is on
	PORTB |= _BV( SWITCH );

	TIMSK |= (1<<TOV0);			//enable timer overflow interrupt

	TCNT0=0x00;				//set timer counter initial value

						//prescaler for timer0
	//TCCR0B |= (1 <<CS00)|(1<<CS02);	//1024
	TCCR0B |= (1<<CS02);			//256
	//TCCR0B |= (1 <<CS00)|(1<<CS01);	//64

	sei();					//enable interrupts 

	flag = 0;					//initial flags
	counter = 0;

	power_all_disable();			//disable all power consumpting modules
	power_timer0_enable();			//except timer0
	set_sleep_mode(SLEEP_MODE_IDLE);
	sleep_enable();

	for (;;) {
		sleep_cpu();
	} 
}