Generating LED Patterns

In this tutorial i am going to show you, how to generate some pattern using LEDs. The micro controller is ATmega128 and the 8 LEDs are connected to the PORTC of the micro controller.
The code is written in such a way that first the LEDs will be glowing  in Right-to-Left fashion and then from Left-to-Right fashion and will continue for ever.

*********************************************************************************

Generating LED Pattern

*********************************************************************************

//Include AVR Header file

 #include < avr/io.h >
 

//Include DELAY Header file
#include < util/delay.h >

//Start main function
void main()
{   

     int i = 0;

     //Set a particular port as output
     DDRC = 0xFF;            //PORTC output
 

     //infinite loop
     while(1)              
     {

          //Loop 8 times from Right to Left  
         while( i < 8)      
         {

              //setting 1 bit at a time in PORTC
              PORTC = (1 << i++);     

             //apply 100 ms delay
             _delay_ms(100);
         }

          //Loop 8 times from Left to Right  
         while( i )      
         {

              //setting 1 bit at a time in PORTC
              PORTC = (1 << --i);     

             //apply 100 ms delay
             _delay_ms(100);
         }  

     }
}

Posted in: AVR, io, Tutorials