#include <avr/io.h>
#include <util/delay.h>

// #define FIRST_LETTER_IMPL(x) #x[0]
// #define FIRST_LETTER(x) FIRST_LETTER_IMPL(x)
// #define PORT_LETTER(PIN) FIRST_LETTER(PIN)

#define SET(register, bit)			register |= 1 << bit
#define CLEAR(register, bit)		register &= ~(1 << bit)
#define TEST(register, bit)			register & 1 << bit
#define TOGGLE(register, bit)		register ^= 1 << bit

#define TEST_PIN(port, bit)			TEST(PIN ## port, bit)
#define TOGGLE_PIN(port, bit)		TEST(PIN ## port, bit)
#define MODE_INPUT(port, bit)		CLEAR(DDR ## port, bit)
#define MODE_OUTPUT(port, bit)		SET(DDR ## port, bit)
#define IS_PIN_SET(port, bit)		(TEST_PIN(port, bit)) == 0
#define IS_PIN_CLEAR(port, bit)		(TEST_PIN(port, bit)) == 1

// LEDs
#define TURN_ON_LED(bit)			SET(PORTB, bit)
#define TURN_OFF_LED(bit)			CLEAR(PORTB, bit)
#define TOGGLE_LED(led)				TOGGLE_PIN(B, led)


#define D1 0
#define D2 1
#define D3 2
#define D4 4
#define SW1 2
#define SW2 4

#define PRESCALE_VALUE	64
#define TIME(ms)		(((F_CPU / PRESCALE_VALUE) * ms) / 1000)

#define LED1 B0

int main() {
	MODE_OUTPUT(B, D2);
	TURN_OFF_LED(D2);

	// TCCR1B |= (PRESCALE); // set timer with prescale
	// TCCR1B |= ((1 << CS10 ) | (1 << CS11 ) ); // set timer with prescale


	while(1) {
		// if ( TCNT1 >= TIME(500)) {

			// TOGGLE_LED(D2);
			TOGGLE_PIN(B, D2);
			_delay_ms(500);


			// TCNT1 = 0; // reset timer value
		// }
	}
}