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keypad not working properly after sometime...

 
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aldinlapinig



Joined: 16 Dec 2005
Posts: 22

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keypad not working properly after sometime...
PostPosted: Sat Feb 11, 2006 8:15 pm     Reply with quote
hi,

i'm using KBD.C driver of the CCS C compiler to drive a 3x4 keypad. At first, it was working fine. But after some time of editing and adding codes, the keypad doesn't work reliably already. For example, if I press '1' button, it wud sometimes recognize it as '2' or '3'. If I press '*', it will give me a '#' or '0'. What could possibly be wrong?

I see this code in the KBD.C file:
#define KBD_DEBOUNCE_FACTOR 33 // Set this number to apx n/333
// n is the number of times you expect
// to call kbd_getc each second


I suspect that this is the reason why I could not get proper data from the keypad. Can anybody give me idea how to solve for the right value for the debounce factor? I don't have idea on how long will it take for the pic to execute one instruction.(well, i believe that execution time will be dependent on the instruction it has to execute.)

If there are any other causes of the problem, what could that be? (is it a short in the keypad internal connection?)

Thank you very much...

kind regards,

-=alDin=- Rolling Eyes
Alberteinstein
Guest
post your code!
PostPosted: Mon Feb 13, 2006 8:57 pm     Reply with quote
Please some code.It's the only way you'll get help!
aldinlapinig



Joined: 16 Dec 2005
Posts: 22

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how to solve for debounce factor?
PostPosted: Fri Feb 17, 2006 9:45 pm     Reply with quote
how can i solve for the debounce factor?

here's a part of my code:

Code:


.
.
.
in_count = 0;
lcd_putc("\f");

while(1) {
      k = kbd_getc();
      if(k!=0) {
         if((k!='*') && (k!='#')) {
            if(in_count <1) {
               kbd_data[in_count] = k;
               kbd_data[in_count + 1] = '\0';        //string terminator
               lcd_putc(kbd_data);
               in_count++;
            }
         }
         
         if(k=='*') {
            if(in_count > 0) {
               kbd_data[in_count] = '\0';
               in_count--;
               lcd_putc("\b \b");      // is there another way?
            }
         }

        if(k=='#') {
           if(in_count>0) {
              somewhere();
           }

           return;
        }   
    }
}


Embarassed
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