Johan,

You may want to try writing your own 250ms delay routine (probably as a
chunk of #asm code) and get rid of the delay_ms() calls.  I had NO END of
problems trying to get anything working on a system I'm working on now
until I did that.  It seems delay_ms and delay_us screw with a lot of
things (or at least I think so), but I can't find documented anywhere how
they work exactly.  I have not gone looking for the source code for those
functions yet.  Anyway, this may not fix your problem, but it's a thought.

Dale

On Mon, 17 Jul 2000, Johan Fredriksson wrote:

> I've tried this on 12C509A and 16F877 with the same result. I'm just looping
> forever reading two pins and sending a text on RS-232. I'm using CCS
> compiler for coding.
>
>    while (-1){
>       if (INPUT(PIN_B3)){
>          printf("B3 High\n\r");
>       } else {
>          printf("B3 Low\n\r");}
>       delay_ms(250);
>
>       if (INPUT(PIN_B4)){
>          printf("B4 High\n\r");
>       } else {
>          printf("B4 Low\n\r");}
>       delay_ms(250);
>    }
>
> Pin B3 gets a logic 1 (4.95V) or 0 (0.01V) and pin B4 is always high. The
> input to B3 comes from a Hall-effect switch. When it detects a magnet it
> gows low and when magnet is removed it goes, of course, high again (pull-up
> to +5V and the Hall acts like a transistor driving to ground). The logic
> output is OK all the time.
>
> When removing the magnet so it goes high again the PIC is dead. But not
> compleatly dead! If I add the magnet again so it goes low the PIC continues
> from where it was again.
>
> Anyone having some hints or ideas? I'm very confused now :-)
>
> /Johan
>
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>

---
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discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
                -- Isaac Asimov

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