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  1. /*
  2. * Hackaday.com AVR Tutorial firmware
  3. * written by: Mike Szczys (@szczys)
  4. * 10/24/2010
  5. *
  6. * ATmega168
  7. * Blinks one LED conneced to PD0
  8. *
  9. * http://h...content-available-to-author-only...y.com/2010/10/25/avr-programming-02-the-hardware/
  10. */
  11.  
  12. #include <avr/io.h>
  13. #include <avr/interrupt.h>
  14.  
  15. int main(void)
  16. {
  17.  
  18.   //Setup the clock
  19.   cli();			//Disable global interrupts
  20.   TCCR1B |= 1<<CS11 | 1<<CS10;	//Divide by 64
  21.   OCR1A = 15624;		//Count 15624 cycles for 1 second interrupt
  22.   TCCR1B |= 1<<WGM12;		//Put Timer/Counter1 in CTC mode
  23.   TIMSK1 |= 1<<OCIE1A;		//enable timer compare interrupt
  24.   sei();			//Enable global interrupts
  25.  
  26.   //Setup the I/O for the LED
  27.  
  28.   DDRD |= 0xff; //(1<<0);		//Set PortD Pin0 as an output
  29.   PORTD = 0xff; //(1<<0);		//Set PortD Pin0 high to turn on LED
  30.  
  31.   while(1) { }			//Loop forever, interrupts do the rest
  32. }
  33.  
  34. ISR(TIMER1_COMPA_vect)		//Interrupt Service Routine
  35. {
  36.   static uint8_t val = 0;
  37.   val ++;
  38.  
  39.   PORTD = ~val; // (1<<0);		//Use xor to toggle the LED
  40. }
Not running #stdin #stdout 0s 0KB
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https://ideone.com/zMio1
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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