RS 232 Befehle

/*

 * RS_232.c

 *

 * Created: 29.10.2012 10:11:53

 *  Author: HP_Advanced

 */ 

#include <avr/io.h>                   // Register Definition fuer Atmega 2560      

#include <delay.h>                    // Für Delay-Funktion

# define FOSC  8 000 000              // Clock Speed = Oscillator-Freq

#define  BAUD  9600                   //  Baudrate

#define MYUBRR FOSC/16/BAUD-1         // Geschwindigkeit der Kommunikation

/*------------------------------------------------------------------

Funktionen zum USART - RS232

------------------------------------------------------------------*/

void USART_Init( unsigned int ubrr )

{

    UBRR0H = (unsigned char)(ubrr>>8);

    UBRR0L = (unsigned char)ubrr;  

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

  UCSR0C = (1<<USBS0)|(3<<UCSZ00);      /* Set frame format: 8data, 2stop bit */

}

/* 8 Bit Wort senden */

void USART_Transmit( unsigned char data )

{

  while ( !( UCSR0A & (1<<UDRE0)) );    /* Wait for empty transmit buffer */    

  UDR0 = data;                          /* Put data into buffer, sends the data */

}

/* 8 Bit Wort Emfangen */

unsigned char USART_Receive( void )

{

  while ( !(UCSR0A & (1<<RXC0)) );    /* Wait for data to be received */  

  return UDR0;     /* Get and return received data from buffer */

}

int main(void)

{   

  USART_Init(MYUBRR);

    while(1)

    {

        USART_Transmit(65);

    _delay_ms(1000);

      // USART_Receive()

    }

}

}