Thursday, February 28, 2013

My first AVR LED Blink program in C

Hi,

I recieved my AVR programmer device last week so, i wrote my first LED blinking program in C (AVR). I used ATMEGA328P-PU chip. Earlier i have assembled my own arduino board so i used the same board for AVR by erasing the bootloader. below is my code

 
#include <avr/io.h>
#include <util/delay.h>

/*
  @author Ujjwal Soni
  Connect a LED between pin 13 and GND.
 */


void delay()
{
  unsigned char counter = 0;
  while (counter != 50)
  {
    /* wait (30000 x 4) cycles = wait 120000 cycles */
    _delay_loop_2(30000);
    counter++;
  }
}


int main(void)
{
  /* Initialization, set PB5 (arduino digital pin 13) as output */
  DDRB |= (1<<PB5);

  while (1) 
  {
    PORTB |= (1<<PB5);  //arduino digital pin 5 -> 5V
    delay();
    PORTB &= ~(1<<PB5);  //arduino digital pin 5 -> GND   
    delay();
  }
  return 0;
} 

Please note that my LED is connected on PIN13.  
I will be also writing pushbutton code which i will be posting here soon.

Cheers,

Ujjwal Soni

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