blink_1mhz.c

Atmega s Test code with 1Mhz Blink LED

void delay_ms(uint16_t x); //General purpose delay
//======================

int main (void)
{
 
    DDRB = 0b11111111; //All outputs
    DDRC = 0b11111111; //All outputs
    DDRD = 0b11111110; //PORTD (RX on PD0)
   
    while(1)
    {
		PORTC = 0xFF;
		PORTB = 0xFF;
		PORTD = 0xFF;
		delay_ms(500);

		PORTC = 0x00;
		PORTB = 0x00;
		PORTD = 0x00;
		delay_ms(500);
    }
   
    return(0);
}


//General short delays
void delay_ms(uint16_t x)
{
  uint8_t y, z;
  for ( ; x > 0 ; x--){
    for ( y = 0 ; y < 90 ; y++){
      for ( z = 0 ; z < 6 ; z++){
        asm volatile ("nop");
      }
    }
  }
}