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//----------------------------------------------------------------------------------
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//----------------------------------------------------------------------------------
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//	Prevodnik RS232 <--> RS485 s prodlevou pri prevodu smerem do RS485
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//	Prevodnik RS232 <--> RS485 s prodlevou pri prevodu smerem do RS485
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//	pri startbitu na RS232 zapne okamzite vysilac. ceka nez prestanou prichazet data a vysilac vypne.
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//	pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485.
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//  je implementovany jednoduchy algoritmus na rozpoznani rychlosti, ktery vsak nefunkuje na veskery mozny obsah bajtu.
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//----------------------------------------------------------------------------------
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//----------------------------------------------------------------------------------
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#include <avr/io.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/interrupt.h>
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#include <stdlib.h>
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#include <stdlib.h>
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//	Main
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//	Main
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// ------------------------------------------------------------------
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// ------------------------------------------------------------------
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int main(void)
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int main(void)
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{
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{
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int delay;
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int delay;
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int bit;
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int spozdeni;
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int spozdeni;
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int last;
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  DDRD |= (1<<DDD5);
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  DDRD |= (1<<DDD5);
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//  DDRB |= (1<<DDB3);
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//  DDRB |= (1<<DDB3);
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  TCCR1B |= (1 << CS10);  // Set up timer
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  TCCR1B |= (1 << CS10);  // Set up timer
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  while(1)
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  while(1)
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  {
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  {
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	if(!(PIND & (1<<PD1)))   // kdyz je 0 na datech
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	if(!(PIND & (1<<PD1)))   // kdyz je 0 na datech
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	{
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	{
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	  PORTD &= ~(1<<PD5);    // zapni vysilani
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	  PORTD &= ~(1<<PD5);    // zapni vysilani
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	  TCNT1 = 0;				// zacni merit cas
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	  for (spozdeni=0;spozdeni<=8;spozdeni ++)
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	  {
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      while (!(PIND & (1<<PD1)));  // cekej na 1
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		last = (PIND & (1<<PD1));
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	  delay = TCNT1;				// hned jak narazis na 1, poznamenej si jak dlouho to trvalo
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	  TCNT1 = 0;					// zacni znova merit cas
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	    TCNT1 = 0;					// zacni znova merit cas
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	  bit = (delay >> 3);			// cas ktery jsme pred tim zmerili videl 8mi aby jsme se dostali maximalne na delku bitu
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	  while (TCNT1 <= delay);  // pockej zmerenou dobu
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	    while (TCNT1 <= delay)
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	  if((PIND & (1<<PD1)))   // kdyz je 1 na datech, pockej jeste
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	  {
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		{
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	    for (spozdeni=0;spozdeni<=16;spozdeni ++)
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		  if((PIND & (1<<PD1)) != last)
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	    {
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		  {
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	      TCNT1 = 0;					// zacni znova merit cas
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		    if (TCNT1 < delay) delay = TCNT1;
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		  if((PIND & (1<<PD1))) while (TCNT1 <= bit);			// kdyz je porad 1 tak pockej jeste delku bitu
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		  else break;
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			break;
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		  }
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        }
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        }
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	  }
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	  }
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	  while (!(PIND & (1<<PD1)));
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    }
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    }
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    else  PORTD |= (1<<PD5);  	// kdyz je 1 prepni na prijem
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    else  PORTD |= (1<<PD5);  	// kdyz je 1 prepni na prijem
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  }
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  }
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  return(0);
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  return(0);
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}
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}