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void SPI_MasterInit(void)

{

  DDRB = (1<<DDB5)|(1<<DDB7)
  SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);

}

void SPI_MasterTransmit(char cData)

{

  SPDR = cData;

  while(!(SPSR & (1<<SPIF)))

    ;

}


void SPI_SlaveInit(void)

{

  DDRB = (1<<DDB6);

  /* Enable SPI */

  SPCR = (1<<SPE);

}

char SPI_SlaveReceive(void)

{

  while(!(SPSR & (1<<SPIF)))

    ;

  return SPDR;

}


void main()
{
   SPI_SlaveInit();
  while (1)
  {
    char vh =  SPI_SlaveReceive();
    eeprom_write(0x00, vh);
  }
}

void USART_Init( unsigned int baud )

{

  UBRRH0 = (unsigned char)(baud>>8);

  UBRRL0 = (unsigned char)baud;

  UCSR0B = (1<<RXEN0)|(1<<TXEN0);

  /* Set frame format: 8data, 2stop bit */

  UCSR0C = (1<<USBS0)|(3<<UCSZ00);

}


void USART_Transmit( unsigned char data )

{

  while ( !( UCSR0A & (1<<UDRE0)) )

       ;

  UDR0 = data;

}


unsigned char USART_Receive( void )

{

  while ( !(UCSR0A & (1<<RXC0)) )

       ;

  return UDR0;

}


void main()
{
  USART_Init(9600);
  while (1)
  {
    char vh =  USART_Receive();
    eeprom_write(0x00, vh);
  }
}

#include <avr/io.h>
//#define F_CPU 1000000UL
#include <util/delay.h>
#include <avr/eeprom.h>
//#include <avr/iom644.h>
#include <avr/interrupt.h>

//#define USART0_RX 0x0028
//#define USART0_TX 0x002C

#ifndef F_CPU
#define F_CPU 11059200//Hz
#endif
/*********** set desired baud rate *************************************************/
#define BAUDRATE 19200 //bod//calculate UBRR value
#define UBRRVAL ((F_CPU/(BAUDRATE*16UL))-1) //UBRVAL - Èíäåêñ ñêîðîñòè

unsigned char USART_Receive( void )
{
   /* Wait for data to be received */
   while ( !(UCSR0A & (1<<RXC0)) )
   ;
   /* Get and return received data from buffer */
   return UDR0;
}

ISR(USART0_TX_vect)
{
   //char rc = USART_Receive();
   //eeprom_write_byte(0x01, rc);
   
   eeprom_write_byte(0x02, '$');
}

void USART_Init()
{
   /* Set baud rate */
   //UBRR0 = (unsigned char)(baud>>8);
   UBRR0 = (unsigned char)UBRRVAL;
   /* Enable receiver, transmitter and interrupts on RX*/
   UCSR0B = (1<<RXEN0)|(1<<TXEN0)|(1<<RXCIE0)|(1<<TXCIE0);
   /* Set frame format: 8data, 2stop bit */
   UCSR0C = (1<<USBS0)|(3<<UCSZ00);
   eeprom_write_byte(0x03, ']');
}

void USART_Transmit( unsigned char data )
{
   /* Wait for empty transmit buffer */
   while ( !( UCSR0A & (1<<UDRE0)) )
   ;
   /* Put data into buffer, sends the data */
   UDR0 = data;
}


int main(void)
{
   //sei();
   asm("sei");
   char tc = '?';
   USART_Init();
   USART_Transmit(tc);
   eeprom_write_byte(0x00, '!');
}