#include <avr/io.h>
#include <avr/interrupt.h> 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// #include "uart.h"
#include <avr/pgmspace.h>
 
#define FOSC 8000000 // Clock Speed
#define BAUD 115200UL
 
// Berechnungen zur Baudrate:
 
#define UBRR_VAL ((FOSC+BAUD*8)/(BAUD*16)-1)   // clever runden
 
 
 
 
/****************************************************/
void USART_Init (unsigned int ubrr)
{
  UBRR0H = (unsigned char)(ubrr>>8);
  UBRR0L = (unsigned char) ubrr;
  UBRR1H = (unsigned char)(ubrr>>8);
  UBRR1L = (unsigned char) ubrr;
 
 
  UCSR0B = (1<<RXEN0) | (1<<TXEN0) |(0<<RXCIE0)|(0<<TXCIE0);
  UCSR0C = (1<<USBS0) | (0<<UCSZ02)|(1<<UCSZ01)|(1<<UCSZ00);
  UCSR1B = (0<<RXEN1) | (0<<TXEN1) |(0<<RXCIE1)|(0<<TXCIE1);
  UCSR1C = (1<<USBS1) | (0<<UCSZ12)|(1<<UCSZ11)|(1<<UCSZ10);
 
} 
 
/**********************************************************/
 
/*-- function receive USART0 --*/
 
unsigned char USART0_Receive (void)
{
    while(!(UCSR0A & (1<<RXC0)) ); // Attendre la disponibilite du caractere
 
     return UDR0; // Renvoi du caractere se trouvant dans le buffer UDR0
}
 
 
/*-- function transmit USART0 --*/
 
void USART0_Transmit (unsigned char data0)
{
  while ( !(UCSR0A & (1<<UDRE0)) ); // Attendre que lŽenvoi soit possible 
 
   UDR0 = data0;
} 
 
/*-- function receive USART1 --*/
 
unsigned char USART1_Receive (void)
{
  while(!(UCSR1A & (1<<RXC1)) );  // Attendre la disponibilite du caractere
 
   return UDR1; // Renvoi du caractere se trouvant dans le buffer UDR1
}
 
/*-- function transmit USART1 --*/  
 
void USART1_Transmit (unsigned char data1)
{
  while ( !(UCSR1A & (1<<UDRE1)) ) ; 
 
   UDR1 = data1; // Envoi de caractere  
}
 
/**********************************************************/
 
/*-Activation de lŽenvoi des positions par le port serie RS485 de USART1-*/
 
 void RS485_Init (void)
{
  DDRD = (1<<PD4)|(1<<PD3)|(1<<PD5);//activation du pin de sortie et de commande
  PORTD = (1<<PD4);	//port de sortie active (Aktivierung Datensendung)
} 
 
 
int main (void)
 
{ 
 
  unsigned char c ;
 
  USART_Init(UBRR_VAL) ;  // USART Initialisierung
  RS485_Init (); // port serie USART1
 
  while(1)
 
  {
 
 
 
/*-- Test USART0 (Receive and Transmit) --*/
 
 //     USART0_Transmit('X');
 
    c = USART0_Receive();
 
    USART0_Transmit(c);
 
 
/*-- Test USART1 (Receive and Transmit) --*/
 
//	USART1_Transmit( 'X' );
//	c = USART0_Receive();
//	USART1_Transmit(c);
 
 
 
  }
 
}