#include <avr/io.h>
//#include <avr/interrupt.h>
#define F_CPU 1000000UL
#include <util/delay.h>

#define CARD_PORT PORTC
#define CARD_DDR DDRC
#define CARD_PIN PINC
#define OUT PC0
#define CLK PC1
#define nRST PC2
#define VPP PC3
#define nRW PC4

#define SETBIT(ADDRESS,BIT) (ADDRESS |= (1<<BIT))
#define CLRBIT(ADDRESS,BIT) (ADDRESS &= ~(1<<BIT))
//#define CHECKBIT(ADDRESS,BIT) (ADDRESS & (1<<BIT))


void main(void)
{
	unsigned char obsah[256];
	unsigned char i=0;


	// mcu init
	CARD_DDR |= 1<<nRW | 1<<CLK | 1<<nRST | 1<<VPP;	// set as output
	CARD_PORT = 0;

	_delay_ms(20);
	SETBIT(CARD_PORT, CLK);		// reset card while RST==0
	_delay_ms(20);
	CLRBIT(CARD_PORT, CLK);
	_delay_ms(20);
	SETBIT(CARD_PORT, nRST);		// wake card from reset
	_delay_ms(10);				// casovy diagram je velice strucny, budu radsi cist pin
								// uprostred intervalu clk==0
	do
	{
		// i>0: po 1. pruchodu je i==1, takze cyklus pokracuje
		// kdyz je i==255, na konci pretece do 0 a cykl konci
		obsah[i++] = CARD_PIN & 1<<OUT;	// nacteni bitu z karty
		_delay_ms(10);
		SETBIT(CARD_PORT, CLK);
		_delay_ms(20);
		CLRBIT(CARD_PORT, CLK);
		_delay_ms(10);
	}while (i>0);

	CLRBIT(CARD_PORT, nRST);

	for (;;)
	{
		//
	}
}