main.c

/*

 * main.c

 *

 *  Created on: 5.07.2012

 *  Author: christian

 */

#include "main.h"

#include <avr/io.h>

#include <eigene/uart.h>

#include <inttypes.h>

#include <avr/interrupt.h>

#include <avr/pgmspace.h>

#include <util/delay.h>

#include <avr/wdt.h>

#define UART_BAUD_RATE 2400

#define DCC_IN    PD3

#define DCC_PORT  PORTD

#define DCC_DDRX DDRD

#define DCC_PIN PIND

#define TIMER_ON TCCR1B |= (1 << CS10);  //Timer anschalten

#define TIMER_OFF TCCR1B &= ~(1 << CS10); TCNT1 =0;  //Timer ausschalten

#define INT_ON   GICR = (1 << INT1); //Interrupt angeschaltet

#define INT_OFF GICR &=~(1 << INT1);

const uint16_t Timer = F_CPU / 1000 / 1000 * 80;

volatile int Preambel_anz[20];

volatile uint64_t dcc = 0;

volatile int16_t Preambel_zahler=0;

ISR(INT1_vect)

{

  TIMER_ON; //startet counter

}

ISR(TIMER1_COMPA_vect)

{

  TIMER_OFF; //beendet_counter

  if ((DCC_PIN & (1 << DCC_IN))) //Wenn 0

  {

    Preambel_anz[Preambel_zahler]++;

    Preambel_zahler=0;

  }

  else

  {

    Preambel_zahler++;

  }

}

int main()

{

  DCC_DDRX = (0 << DCC_IN); //Eingang

  DCC_PORT = (1 << DCC_IN); //Pullup

  uart_init(UART_BAUD_SELECT(UART_BAUD_RATE, F_CPU)); //standard in jedem UART-Programm

  interrupt_init();

  sei();

  _delay_ms(500);

  uart_puts_P("Hallo!");

  _delay_ms(500);

  uart_puts("weichendekoder");

   _delay_ms(3000);

   for(int i=0;i<20;i++)

   {

     uart_puts_P("\n"); 

     uart_puti(i);

     uart_puts_P(": "); 

     uart_puti(Preambel_anz[i]);

   }

   wdt_enable(WDTO_2S);//restart µC

  while (1);

  return 0;

}

void interrupt_init()

{

  //Interruptpin

  MCUCR |= (1 << ISC11) | (1 << ISC10);

  INT_ON;

  //timer interrupt

  TIMSK = (1 << OCIE1A); //Compare Match

  OCR1A = Timer; //auf 70µs eingestellt

  TCCR1B |= (1 << WGM12);

}