Hello,

I  tried your code Dag.
But since i have some other routines running i see
unwanted behaviour. So i try to switch that off first.

The bit pattern coming out now looks like
00110011001101010100110011001100
and repeats over and over again.

grtz

Simon



 --- Dag Bakken <dag@C74.NO> wrote: > Sorry about
that...  I actually managed to
> misunderstand.  This is a
> correction.  A circular buffer would be something
> like this, and very
> much like another reply you got in asm.
>
> W=rr(pwm);
> led1=Carry;
> pwm=rr(pwm);
>
> This should generate something like:
>
>     RRF   pwm,W      ; Get bit
>     BTFSS Carry      ; Output it
>     BCF   led1
>     BTFSC Carry
>     BSF   led1
>     RRF   pwm,F      ; Re-insert
>
> It doesn't really matter.  You can just as well do
> something like
> this:
>
> W=rr(pwm);
> pwm=rr(pwm);
> led1=pwm.3;
>
>
> Dag S
>
>
> STdF> Hello,
>
> STdF> Thanks for the replies.
> STdF> Following Dag's hint, since i use CC5x, i
> found out it
> STdF> did not work.
> STdF> In MPASM i tried the piece of code which is
> shown
> STdF> below.
>
> STdF> start   clrw
> STdF>         CLRF    PORTA
> STdF>         BSF     STATUS, RP0
> STdF>         MOVLW   0x00
> STdF>         MOVWF   TRISA
> STdF>         BSF     STATUS, C
> STdF>         BCF     STATUS, RP0
> STdF>         MOVLW   0x55
> STdF>         MOVWF   pwm
>
>
> STdF> main    BTFSS   pwm,0
> STdF>         BCF     PORTA,0
> STdF>         BTFSC   pwm,0
> STdF>         BSF     PORTA,0
>
> STdF>         rrf     pwm,1
> STdF>         goto    main
> STdF> ;
> STdF> END
>
> STdF> So i filled pwm with 0xAA.
> STdF> I'd expected a bit pattern on the output which
> should
> STdF> look like 01010101.
> STdF> What i see happening in MPASM, when i trace
> pwm, is
> STdF> 0xAA, 0x55, 0x2A, 0x95, 0x4A, 0xA5, 0x52,
> 0xA9, 0x54,
> STdF> 0xAA. And this continues since pwm is not
> affected.
> STdF> So that is OK.
>
> STdF> However when i try it on my 16F84. I see the
> 01010101
> STdF> pattern and then it stops, and the led i
> connected at
> STdF> that pin stays low.
>
> STdF> What CC5x does with
>
> STdF> led1 = pwm.0;
> STdF> pwm = rr(pwm);
>
> STdF> is exactly what is in the main loop.
>
> STdF> As i said, when implemented on my PIC it does
> not
> STdF> work.
>
> STdF> grtz
>
> STdF> Simon
>
>
> STdF>
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