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Код: Выделить всё

unsigned char counter=0;
unsigned char second=0;
//-----------------------------------------
// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
  if(++counter==28)
  {
     counter=0;
     second++;
     PORTB=~PORTB;
  }
}

Код: Выделить всё

#include <mega644a.h>

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{ unsigned char counter = 0, second = 0;
// Place your code here
if (++counter == 28) {
        counter = 0;
        second++;
        PORTB.3=~PORTB.3;
};

}

// Declare your global variables here

void main(void)
{
// Declare your local variables here

// Crystal Oscillator division factor: 1
#pragma optsize-
CLKPR=0x80;
CLKPR=0x00;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif

PORTB=0x00;
DDRB=0x08;


// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 7,200 kHz
// Mode: Normal top=0xFF
// OC0A output: Toggle on compare match
// OC0B output: Disconnected
TCCR0A=0x00;
TCCR0B=0x05;
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;

// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=0x01;


ACSR=0x80;
ADCSRB=0x00;
DIDR1=0x00;


// Global enable interrupts
#asm("sei")

while (1)
      {
      // Place your code here

      }
}

Код: Выделить всё

second=0;
while( rx_data !=0x0D )
{
  if( second > 2) return -1;
}