/* by xerpi */

static const byte segment_bits[11] =
{

/*
PORTD - digital 0-7
PORTB - digital 8-13
PORTC - analog  0-5

	  a
	 ---
      f | g | b
	 ---
      e |   | c
	 --- .
	  d   DOT

	  7
	 ---
      6 | 5 | 8
	 ---
      1 |   | 3
	 --- .
	  2   4

*/
	0b11100111,	// 0
	0b10000100,	// 1
	0b11010011,	// 2
	0b11010110,	// 3
	0b10110100,	// 4
	0b01110110,	// 5
	0b01110111,	// 6
	0b11000100,	// 7
	0b11110111,	// 8
	0b11110100,	// 9
	0b00001000,	// DOT
};

/*
1) DATA -> 0 or 1
2) CLOCK -> LOW
3) delay 1us ?¿
4) CLOCK -> HIGH (Here data enters to the register)
5) delay 1us ?¿
6) End
*/


#define _BIT(n) (1<<n)
#define _NOP() asm("nop\n")

#define DDRB_OUTPUT(pin) (DDRB |= _BIT(pin))
#define DDRB_INPUT(pin)  (DDRB &= ~_BIT(pin))

#define PORTB_HIGH(pin) (PORTB |= _BIT(pin))
#define PORTB_LOW(pin)  (PORTB &= ~_BIT(pin))

#define PINB_STATUS(pin) (PINB & _BIT(pin))

#define DATA_PIN 	0 //Digital pin 8
#define CLK_PIN 	1 //Digital pin 9
#define MR_PIN 		2 //Digital pin 10 (not necessary)

#define RESET_MR() {PORTB_LOW(MR_PIN); _NOP(); PORTB_HIGH(MR_PIN);}
#define SEND_CLK() {PORTB_LOW(CLK_PIN);_NOP();PORTB_HIGH(CLK_PIN);_NOP();}

void sendBinary(byte number)
{
	for(int i = 7; i > -1; i--)
	{
		(number & _BIT(i)) ? PORTB_LOW(DATA_PIN) : PORTB_HIGH(DATA_PIN);
		SEND_CLK();
	}
}

void sendNumber(int number)
{
	if((number > -1) && (number < 11))
	{
		sendBinary(segment_bits[number]);
	}
}

void CLEAR_ALL()
{
	sendBinary(0x0);	
}

void setup()
{
	DDRB_OUTPUT(DATA_PIN);
	DDRB_OUTPUT(CLK_PIN); 
	DDRB_OUTPUT(MR_PIN);
	
	PORTB_HIGH(DATA_PIN);
	PORTB_HIGH(MR_PIN);
}



void loop()
{
	for(int i = 0; i < 10; i++)
	{
		sendNumber(i);
		delay(350);
		
	}
	for(int i = 10; i > 0; i--)
	{
		sendNumber(i);
		delay(350);
	}
}