DMX - kein Empfang

void init_DMX_RX(void)

{ 

UBRR1L  = ((F_CPU/16000000UL)-1);          //250kbaud, 8N2

  UBRR1H = 0;

  //UBRR1L = ((16000/4000)-1);

  //UBRR1 = ((F_CPU)/((250000)*16)-1);

  //((F_CPU)/((250000)*16)-1); //  

  //UCSR1C  = (3<<UCSZ10)|(1<<USBS1);

  UCSR1C = (1<<USBS1)|(1<<UCSZ12)|(1<<UCSZ10);

  UCSR1B  = (1<<RXEN1)|(1<<RXCIE1);

  gDmxState= IDLE;

  uint16_t i;

  for (i=0; i<sizeof(DmxRxField); i++)

  {

    DmxRxField[i]= 0;

  }

  DmxAddress = 1;

}

ISR (USART1_RX_vect)

{

  uint8_t USARTstate= UCSR1A;            //get state

  uint8_t DmxByte= (UDR1);              //get data

  uint8_t DmxState= gDmxState;          //just get once from SRAM!!!

  IndFlags |= (1<<SIGNAL_COMING);

  if (USARTstate & (1<<0xFE))            //check for break

    {

      UCSR1A &= ~(1<< 0xFE);              //reset flag

      DmxCount=  DmxAddress;            //reset frame counter

      gDmxState= BREAK;

      DMXStateOPT = 0x01;

    }

  else if (DmxState == BREAK)

    {

      if (DmxByte == 0) 

      {

        gDmxState= STARTB;            //normal start code detected

        gDmxPnt= ((uint8_t*)DmxRxField +1);

        DMXStateOPT = 0x01; //Gültiger DMX Wert empfangen

      }

      else gDmxState= IDLE;

    }

  else if (DmxState == STARTB)

    {

      PORTD |= ( 1 << PD7 ); //PORTD ^= ( 1 << PD7 );

      if (--DmxCount == 0)            //start address reached?

      {

        gDmxState= STARTADR;

        DmxRxField[0]= DmxByte;

      }

    }

  else if (DmxState == STARTADR)

    {

      uint8_t *DmxPnt;

      DmxPnt= gDmxPnt;

      *DmxPnt= DmxByte;

      if (++DmxPnt >= (DmxRxField +sizeof(DmxRxField)))   //all ch received?

      {

        gDmxState= IDLE;

        IndFlags |= (1<<VALID_DMX);

      }

      else gDmxPnt= DmxPnt;

      //PORTD &= ~( 1 << PD7 );

    }

    //PORTD |= ( 1 << PD7 );    

  uart_putc(DmxByte);   //send to PC        

}

//FIXME

dev_mode = 0;

  if (dev_mode == 0)

  {

    //DMX Start Rec

    init_DMX_RX();

    dmx_set_receive(1);

  } else if (dev_mode == 1)

  {

    //DMX Start Trasmit

    init_DMX_TX();

    dmx_set_receive(0);

  }

  mytimer_wait_MS(200);

  led_status(1);

  while(DMXStateOPT != 0x01) //Warte auf erstes DMX Paket

  {

    led_status(1);

    for (i=0; i < 150; i++)

    {

      service_uart_read(subuf);

      mytimer_wait_MS(1);

      scheduler();

    }

    led_status(0);

    for (i=0; i < 150; i++)

    {

      service_uart_read(subuf);

      mytimer_wait_MS(1);

      scheduler();

    }

  }

led_status(0);

  for (;;)

  {

    led_status(0);

    scheduler();

    service_uart_read(subuf);

  }

  while(1);