Kommunikation CP2102

/*

 * Mein_erstes_Projekt.c

 *

 * Created: 15.06.2012 16:00:24

 *  Author: Eisvogel

 */ 

#define F_CPU 10000000UL

#define FOSC 10000000

#define BAUD 9600

#define MYUBRR FOSC/16/BAUD-1 

#include <avr/io.h>

unsigned char USART_Receive(void);

void USART_Transmit( unsigned char data );

void USART_Init( unsigned int ubrr);

void USART_Flush(void);

int main(void)

{

  //USART initialisieren

  USART_Init(MYUBRR);

  //Ungültige Daten löschen

  USART_Flush();

  DDRB = (1<<PB1)|(1<<PB2)|(1<<PB3)|(1<<PB4)|(1<<PB5);

  unsigned char Daten;

    while(1)

    {

    USART_Transmit(Daten = USART_Receive());

  }    

}

void USART_Init( unsigned int ubrr)

{

  UBRR0H = (unsigned char)(ubrr>>8); // Set baud rate in high- and low-register

  UBRR0L = (unsigned char)ubrr;

  UCSR0C = (1<<UCSZ01)|(1<<UCSZ00); // Set frame format: 8data, 1stop bit

  UCSR0B = (1<<RXEN0)|(1<<TXEN0); // Enable receiver and transmitter

}

void USART_Transmit( unsigned char data )

{

  /* Wait for empty transmit buffer */

  while ( !( UCSR0A & (1<<UDRE0)) )

  ;

  /* Put data into buffer, sends the data */

  UDR0 = data;

}

unsigned char USART_Receive(void)

{

  /* Wait for data to be received */

  while ( !(UCSR0A & (1<<RXC0)) );

  /* Get and return received data from buffer */

  return UDR0;

}

void USART_Flush(void) // Flush Receive-Buffer (entfernen evtl. vorhandener ungültiger Werte)

{

  unsigned char dummy;

  while (UCSR0A & (1<<RXC0))

  dummy = UDR0;

}