ATmega1284P, USART1 und Rec_Interrupt

#define UBRR_19k2  129 //für Baudrate 19,231k

int main(void)

{

  [...]

  USART1_init(UBRR_19k2); //USART1 intialisieren

  PORTD &= ~(1<<PD7);

  sei();   

  [...]                                               

}

void USART1_init(unsigned int ubrr1)

{

  UBRR1H = (unsigned char) (ubrr1>>8); 

  UBRR1L = (unsigned char) ubrr1;

  UCSR1C = (1<<UCSZ11) | (1<<UCSZ10); //frame format: 8data, 1stop bit, asynchronous USART, No parity

  UCSR1B = (RXCIE1)    | (1<<TXEN1)  | (1<<RXEN1); //Enable receiver & transmitter and receiver interrupt

  UCSR1A = (1<<U2X1);                 //Double speed mode

}

ISR(USART1_RX_vect)

{

  static unsigned char uc_zaehler_RXD_Bytes = 0;

  PORTD |= (1<<PD7); 

  uc_Receive_RX1[uc_zaehler_RXD_Bytes] = UDR1;

  if (uc_Receive_RX1[uc_zaehler_RXD_Bytes] == 0x0D) //Ende der Übertragung

  {

    uc_zaehler_RXD_Bytes = 0;

    f120_Flag.O2_Sensorkommunikation_komplett = 1;

  }

  else

    uc_zaehler_RXD_Bytes++;

}