> OK, sometimes we have luck, others not.
>
> But if the code is not very known, this is the chance for others to
> learn it.
>
>
> Best regards,
>
> Isaac
>

Isaac,

Don't get me wrong. It is an elegant solution to the problem and you should=
=20
be proud for coming up with it.

-- Bob



>
> Em 20/1/2012 17:10, Bob Ammerman escreveu:
>> Sorry, been there and done that.
>>
>> -- Bob Ammerman
>>
>> ----- Original Message -----=20
>> From: "Isaac Marino Bavaresco" <isaacbavaresco@yahoo.com.br>
>> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>> Sent: Friday, January 20, 2012 11:48 AM
>> Subject: [PIC] New(?) way for rotating a variable number of positions
>> inassembly
>>
>>
>>> I was needing an (very) efficient way to rotate a byte a variable numbe=
r
>>> of positions when the following popped on my mind:
>>>
>>>
>>>        btfsc    TABLAT, 2, ACCESS
>>>        swapf    PRODL, F, ACCESS
>>>        btfsc    TABLAT, 1, ACCESS
>>>        rrncf    PRODL, F, ACCESS
>>>        btfsc    TABLAT, 1, ACCESS
>>>        rrncf    PRODL, F, ACCESS
>>>        btfsc    TABLAT, 0, ACCESS
>>>        rrncf    PRODL, F, ACCESS
>>>
>>>
>>> The number of positions to rotate is in TABLAT and the value to be
>>> rotated is in PRODL.
>>> The routine can rotate from zero to 7 positions, takes only 8
>>> instructions and as a bonus it is isochronous.
>>>
>>> Did somebody already know it or can I boast that I invented it?
>>>
>>>
>>> Isaac
>>>
>>> --=20
>>> http://www.piclist.com PIC/SX FAQ & list archive
>>> View/change your membership options at
>>> http://mailman.mit.edu/mailman/listinfo/piclist
>
> --=20
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist=20

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