Thanks Vaclav,
silly me, the pin was shorted.
I violated the three laws of development work:
Assume nothing, Believe nothing, Check everything, or ABC for short!
Because the PCB was unpopulated except for the PIC and XTAL and
bypasses,
I assumed that there would be no shorts and failed to check it and
believed
that this was a sw issue (being a programmer!).
There was actually a very very tiny copper blop between a trace and
gnd.
I barely saw it, but scrapring with a knife tip removed the short.
Sorry for the wasted band width and thanks to Fabien also.
br Kusti
>>> vacla...@seznam.cz 11.1.2009 18:39 >>>
Hi Kusti,
are you sure that you have proper connection of wires to that pin ? And
pin is not shorted to anything else?
AFAIK PORTD2 bit has no other functionality to 1 and 0 bits.
If you remove anything else and make simplest code ( just Z = 0,
delay(); Z= 1; delay() )- it does not work, too ?
Vaclav
> ----------------------------------------
> Hi,
>
> this is not the right list, I know, but at very least I hope someone
> will direct me to a list likely to produce some insight to my
problem.
>
> I using PIC18F4550 and so far I've got remarkable little problems.
>
> However I've not been able to control the bit 2 of PORT D.
>
> I'm observing the direct outputs from the MCU pin with oscilloscope.
>
> I've looked at the code produced by SDCC and it makes perfect sence.
>
> So I'm thinking this is something to do with some PIC18
configuration
> or
> some registers not being set up properly.
>
> I've been up and down the datasheet but have not found anything
> that would get me further.
>
> My code is as follows:
>
> #define STEP_X PORTDbits.RD0
> #define STEP_X_TRIS TRISDbits.TRISD0
>
> #define STEP_Y PORTDbits.RD1
> #define STEP_Y_TRIS TRISDbits.TRISD1
>
> #define STEP_Z PORTDbits.RD2
> #define STEP_Z_TRIS TRISDbits.TRISD2
>
> <snip>
>
> STEP_X_TRIS = 0;
> STEP_Y_TRIS = 0;
> STEP_Z_TRIS = 0;
> <snip>
>
> for (;;) {
> STEP_X = 0;
> STEP_Y = 0;
> STEP_Z = 0;
> LED_PIN = 0;
> delay_ms(2);
>
> STEP_X = 1;
> STEP_Y = 1;
> STEP_Z = 1;
>
> LED_PIN = 1;
> delay_ms(2);
>
> }
>
> br Kusti
>
>
>
>
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