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//----------------------------------------------------------------------------------
//      Prevodnik RS232 <--> RS485 s prodlevou pri prevodu smerem do RS485
//      pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485.
//----------------------------------------------------------------------------------

#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdlib.h>
#include <ctype.h>
#include <avr/eeprom.h>
#include <avr/pgmspace.h>


#define F_CPU 3686400UL
#include <util/delay.h>

void delay_ms(unsigned int ms)
{
  while(ms)
  {
    _delay_ms(0.96);
        ms--;
  }
}


// ------------------------------------------------------------------
//      Main
// ------------------------------------------------------------------
int main(void)
{
int delay;
int spozdeni;
int last;

  DDRD |= (1<<DDD5);
//  DDRB |= (1<<DDB3);

  TCCR1B |= (1 << CS10);  // Set up timer 

//  PORTB |= (1<<PB3);

  while(1)
  {
        if(!(PIND & (1<<PD1)))   // kdyz je 0 na datech 
        { 
          PORTD &= ~(1<<PD5);    // zapni vysilani        
          for (spozdeni=0;spozdeni<=8;spozdeni ++)
          {
                last = (PIND & (1<<PD1));
            TCNT1 = 0;                                  // zacni znova merit cas
            while (TCNT1 <= delay)
                {
                  if((PIND & (1<<PD1)) != last)
                  {
                    if (TCNT1 < delay) delay = TCNT1;
                        break;
                  }
        }
          }
          while (!(PIND & (1<<PD1)));
    }
    else  PORTD |= (1<<PD5);    // kdyz je 1 prepni na prijem 
  }
  return(0);
}