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


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