Hi Nuri,

After a quick look I would say you are not sampling your button in real time,
are events happening too quickly for you to see?

I would use a 50mS interrupt from TMR0 to poll the button so you can control
the rate at which pos is updated.

Regards.

Nigel





On Thursday, February 08, 2001 9:14 AM, Nuri ERGINER [SMTP:nerginer@SSM.GOV.TR]
wrote:
> Hi,
>
> Please have a look at the below code. The chip is 16f84a. The osilator is
> selected as xt and the wdt is disabled. There is a button on RB0 to trigger
> the interrupt and there is a motor driver on pins RB1 and RB2.
> What I want to do is to count the button presses and change the direction of
> the motor when It reaches to the specified values (max and min)
> I will be very happy if someone can help me in the project.
> The hi-tech C code (lite version):
>
> #include <pic.h>
> #define PIC_CLK 4000000
> #include <delay.c>
> #define CP_off|=0x3FFF//copy protect off
>
> #define OUTPUT 0;
> #define INPUT 1;
>
> unsigned char max;
> unsigned char min;
> unsigned char pos=9;
> unsigned char dir=1;
>
>
> main(){
>
> // init
>         TRISB=49;
>         PORTB=0;
>
>         max=20;
>         min=10;
>
>         INTE=1;
>         GIE=1;
>
>         for(;;){
>                 if (pos>max) {
>                         dir=0;
>                         RB1=0;//motor left
>                         RB2=1;//motor left
>                 }
>                 if (pos<min) {
>                         dir=1;
>                         RB1=1;//motor right
>                         RB2=0;//motor right
>                 }
>
>
>         }//for
>
> }//main
>
> static void interrupt isr(void){
>
> if (INTF) {
>         if (dir==0){pos--;}
>         if (dir==1){pos++;}
>         INTF=0;
> }//if
>
> }
>
> Regards,
> Nuri Erginer
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.