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//----------------------------------------------------------------------------------
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//	Prevodnik RS232 <--> RS485
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//	pri startbitu na RS232 zapne okamzite vysilac pokud nejsou detekovana data z RS485.
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//----------------------------------------------------------------------------------
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <avr/eeprom.h>
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#include <avr/pgmspace.h>
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#define POVOLOVAK_LOW	PORTB &= ~(1<<PB3)
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#define POVOLOVAK_HIGH  PORTB |= (1<<PB3)
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#define DATA	(PIND & (1<<PD1))
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// ------------------------------------------------------------------
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//	Main
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// ------------------------------------------------------------------
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int main(void)
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{
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int delay;
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int spozdeni;
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int last;
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  DDRD |= (1<<DDD5);
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  DDRB |= (1<<DDB3);
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  TCCR1B |= (1 << CS10);  // Set up timer
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  while(1)
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  {
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	if(!DATA)   // kdyz je 0 na datech
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	{
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	  POVOLOVAK_HIGH;    // zapni vysilani
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	  for (spozdeni=8;spozdeni>=0;spozdeni --) // odpocitej dobu 8mi bitu
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	  {
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		last = DATA;
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	    TCNT1 = 0;					// zacni znova merit cas
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	    while (TCNT1 <= delay)		// bit poznas tak, ze je to nejmensi nalezena delka trvaleho stavu
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		{
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		  if(DATA != last)
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		  {
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		    if (TCNT1 < delay) delay = TCNT1;
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			break;
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		  }
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        }
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	  }
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	  while (!DATA);				// cekani na stop bit
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	  for (spozdeni=2;spozdeni >= 0;spozdeni --)
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	  {
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	    TCNT1 = 0;					// zacni znova merit cas zacatku stopbitu
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	    while (TCNT1 <= delay) if(!DATA) break;
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	  }
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    }
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    else  POVOLOVAK_LOW;  	// kdyz je 1 prepni na prijem
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	delay = 60000;
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  }
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  return(0);
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}