Brauche dringend Hilfe - UART Anfängerproblem

/*

 * UART.c

/*  Sample program for Olimex AVR-CAN with AT90CAN128 processor

 *  Echoes back the received characters on the USART0.

 *  Compile with AVRStudio+WinAVR (gcc version 3.4.6)

 */

#define  __AVR_AT90CAN128__  1

#define OSCSPEED  16000000    /* in Hz */

#include "avr/io.h"

void PORT_Init()

{

  PORTA = 0b00000000;

  DDRA = 0b00000000;

  PORTB = 0b00000000;

  DDRB = 0b00000000;

  PORTC = 0b00000000;

  DDRC = 0b00000000;

  PORTD = 0b00000000;

  DDRD = 0b00000000;

  PORTE = 0b00010000;    //Turn Led off (Bit4 = 1)

  DDRE = 0b00010010;    //Led set as output (Bit4 = 1), TX set as output (Bit1 = 1)

  PORTF = 0b00000000;

  DDRF = 0b00000000;

}

void WDT_Off(void)

{

  asm("push r30");  // using GCC without optimizations results in

  asm("ldi r30, 0x18");  // a code not meeting the requirements

  asm("sts 0x60, r30");  // of the datasheet.

  asm("ldi r30, 0x7");

  asm("sts 0x60, r30");

  asm("pop r30");

  WDTCR = (1<<WDCE) | (1<<WDE);

  WDTCR = 0x07;          //increase Watchdog time-out period (Bit0,1,2 = 1)

}

void UART_Init(uint32_t Baud)

{

  unsigned int BaudRate = OSCSPEED / (16 * Baud) - 1;  //calculate BaudRate

  //set BaudRate into registers

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

  UBRR0L = (unsigned char) BaudRate;

  UCSR0B = 0b00011000;    //enable TX(Bit4 = 1), RX(Bit3 = 1)

  UCSR0C = 0b00000110;    //set frame format (8 bits, 1 stop bit)

}

unsigned char UART_Receive()

{

  if (UCSR0A & 0b10000000)

    return UDR0;

  else

    return 0;

}

void UART_Transmit(unsigned char Data)

{

  while (!(UCSR0A & 0b00100000));

  UDR0 = Data;

}

int main()

{

  unsigned char Ch;

  WDT_Off();

  PORT_Init();

  UART_Init(9600);

  while (1)

  {

    asm("WDR");        //avoiding reset of the program

    Ch = UART_Receive();  //receiving char

    if (Ch)

    {

      UART_Transmit(Ch);  //returning char

    }

  }

}