Need help with a code. Beginner.

[agnivesh.adhikari]

I want my code to increase a variable at a fast rate, 500 times a second or so, only when a push button is pressed. The maximum value for the variable should be 5 (i.e. the variable can have any value from 0 to 5). Then i want PORTB = the variable. Push button may be connected to PORTC.F1 (doesnt matter where it is connected). Please suggest a simple code.

Thanking you in anticipation

[Sy]

Hi,

There are several ways you could do this, 500 times a second isn't fast. You could use an interrupt on a timer and set the timer for 500Hz.

In your interrupt increment your counter, make sure you declare your counter as volatile. Are you writing some debounce logic?

[agnivesh.adhikari]

Actually, I wanted to make a dice. in order to randomize the output, 500Hz would be enough i guess. You must have guessed that switch bounce isnt a factor. I'm an absolute beginner, so i dont know much about interrupts and counters. Please explain a little elaborately. Sorry if i sound silly.

[Sy]

I'm at work at the moment if no one else replies, I'll post something tonight. 12:09 GMT here now.

[agnivesh.adhikari]

Thank you very much!!!

[drdoug]

Have you looked at the examples? You can make slight modifications and get the results you are looking for and learn different programming strategies in the process. It is how I learned.
Break it up into individual parts. Button, timer, display, done.

[agnivesh.adhikari]

I have figured it out. Thanks all of you for your help!!! For anyone curious about the code:

Code: Select all

void main()
 {
 TRISB = 0x00;
 TRISC = 0x01;
 PORTB = 0x00;
      while(1)
       {
            while(PORTC.F0 == 1)
             {
                  if(PORTB < 6)
                   {
                   PORTB = PORTB + 1;
                   }
                  else
                   {
                   PORTB = 0x01;
                   }
             }
       }
 }