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#include <avr/io.h>
#include <avr/interrupt.h>

#define F_CPU 9216000UL // 9.216 MHz
#include <util/delay.h>

#define sbi(var, mask)   ((var) |= (1 << (mask)))
#define cbi(var, mask)   ((var) &= ~(1 << (mask)))

/* Prototypes */
void InitUART (unsigned char baudrate);
unsigned char ReceiveByte (void);
void TransmitByte (unsigned char data);
void print (char *string);
unsigned char indata;
int strcmp(char*, char*);

int
main (void)
{
  char buf[20]; // may be more if longer strings expected
  int i, known, passed;
  InitUART (59);               /* Set the baudrate to 9600bps using a 9.216MHz crystal */

  sbi(DDRD, 2);
  sbi(DDRD, 3);
  sbi(DDRD, 4);
  sbi(DDRD, 5);
  sbi(DDRD, 6);
  sbi(DDRB, 3);
  PORTD = 0;

  while (1) {

    i = ReceiveByte();

    if (i) {
      print("zapinam zarizeni 1\n");
      print("zapinam zarizeni 2\n");
      print("zapinam zarizeni 3\n");
      print("zapinam zarizeni 4\n");
      print("zapinam zarizeni 5\n");
      print("zapinam zarizeni 6\n");
      print("zapinam zarizeni 7\n");
    }

  }


}


/* Initialize UART */
void
InitUART (unsigned char baudrate)
{
  /* Set the baud rate */
  UBRRL = baudrate;

  /* Enable UART receiver and transmitter */
  UCSRB = (1 << RXEN) | (1 << TXEN);

  /* 8 data bits, 1 stop bit */
  UCSRC = (1 << UCSZ1) | (1 << UCSZ0);

}

/* Read and write functions */
unsigned char
ReceiveByte (void)
{
  /* Wait for incomming data */
  while (!(UCSRA & (1 << RXC)));

  /* Return the data */
  return UDR;
}

void
TransmitByte (unsigned char data)
{
  /* Wait for empty transmit buffer */
  while (!(UCSRA & (1 << UDRE)));

  /* Start transmittion */
  UDR = data;
}

void print (char *string){
  while (*string) {
  while (!(UCSRA & (1 << UDRE)));
  UDR = *string;
  string++;
  }
  string = 0;
  return;
}