Neil,

the purpose of TRIS is to make pins input or output. use PORT to drive=A0le=
ds on/off.
call TRIS in main once and in your while loop use PORT. =A0for single pin l=
ets say to toggle PORTbits.RC0 ^=3D 1; =A0

AA







On Thursday, November 28, 2013 12:17 PM, Neil <picdude3@narwani.org> wrote:
=20
Also just tried this on another computer with MPLAB v8.76 and C18=A0=20
v3.42.=A0 Same non-working behaviour.

Cheers,
-Neil.



Quoting Neil <picdude3@narwani.org>:

> Happy Thanksgiving US folks,
>
> Trying to figure out why code isn't working, I've whittled it down to
> this oddity:
>
> This works, toggling LED's repeatedly as expected...
>
> while (1)
> {
> =A0=A0=A0 TRISC =3D 0b10101010;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // '0's will=
 turn LED's on.
> =A0=A0=A0 for (x=3D0; x<200; x++)
> =A0=A0=A0 {
> =A0=A0=A0 =A0=A0=A0 Delay10TCYx(255);
> =A0=A0=A0 =A0=A0=A0 res++;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // Dumm=
y task
> =A0=A0=A0 }
> =A0=A0=A0 TRISC =3D 0b01010101;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // '0's will=
 turn LED's on.
> =A0=A0=A0 res++;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // Dumm=
y task
> =A0=A0=A0 for (x=3D0; x<200; x++)
> =A0=A0=A0 {
> =A0=A0=A0 =A0=A0=A0 Delay10TCYx(255);
> =A0=A0=A0 =A0=A0=A0 res++;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // Dumm=
y task
> =A0=A0=A0 }
> }
>
>
> However, when I switch delay functions and adjust the time units
> accordingly, the code stalls at the delay...
>
> while (1)
> {
> =A0=A0=A0 TRISC =3D 0b10101010;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // '0's will=
 turn LED's on.
> =A0=A0=A0 for (x=3D0; x<200; x++)
> =A0=A0=A0 {
> =A0=A0=A0 =A0=A0=A0 Delay100TCYx(26);
> =A0=A0=A0 =A0=A0=A0 res++;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // Dumm=
y task
> =A0=A0=A0 }
> =A0=A0=A0 TRISC =3D 0b01010101;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // '0's will=
 turn LED's on.
> =A0=A0=A0 res++;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // Dumm=
y task
> =A0=A0=A0 for (x=3D0; x<200; x++)
> =A0=A0=A0 {
> =A0=A0=A0 =A0=A0=A0 Delay100TCYx(25);
> =A0=A0=A0 =A0=A0=A0 res++;=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 // Dumm=
y task
> =A0=A0=A0 }
> }
>
>
> This is a fresh install of MPLAB 8.66 with C18 v3.46.=A0 I've disabled
> all optimizations in the project's build options.=A0 What else should I
> be checking, or is this a legitimate bug with the compiler/libraries?
> FWIW, I also noticed that I could previously use "while (1)" for
> infinite loops, but now the compiler hangs for several minutes, memory
> usage climbs significantly, then just fails to compile.
>
> Cheers,
> -Neil.
>
>
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

>



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