#include <inttypes.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <util/delay.h>

const int iDotLength = 75;

void dot()
{
   PORTB |= 1;
   _delay_ms ( iDotLength );
   PORTB &= ~1;
}

void dash()
{
   PORTB |= 1;
   _delay_ms ( iDotLength );
   _delay_ms ( iDotLength );
   _delay_ms ( iDotLength );
   PORTB &= ~1;
}

void space()
{
   _delay_ms ( iDotLength );
   _delay_ms ( iDotLength );
   _delay_ms ( iDotLength );

}

int main()
{
   volatile int iSymbol = 0;
   volatile int iCount = 50;

   DDRB = 1;
   PORTB |= ( 1 << PB2 );

   for ( ; ; )
   {
      iSymbol = rand() % 3;

      if ( iCount != 0 )
      {
         switch ( iSymbol )
         {
            case 0:dot();break;
            case 1:dash();break;
            case 2:space();break;
         }
         _delay_ms ( iDotLength );
         iCount -= 1;
      }

      if ( ( ( PINB >> PB2 ) & 1 ) == 0 )
      {
         iCount = 50;
      }

   }
}