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Hi Josh!


I did not know BAM, but after I read your post I found it interesting,
so I wrote some code to test an idea.
It seems to be working OK, please see the attached file.


Cheers,

Isaac





Em 27/08/2015 11:10, Josh Koffman escreveu:
> Hi all,
>
> Amongst all the other things on my plate right now, I'd like to make a
> small library to do Bit Angle Modulation on some of my projects. I
> made one years ago in assembly, but now I'd like to do it in XC8.
>
> For reference, there are some great posts on BAM on the PicBasic forums h=
ere:
>
> http://www.picbasic.co.uk/forum/showthread.php?p=3D45597
> http://www.picbasic.co.uk/forum/showthread.php?t=3D10564
>
> Because the PIC will be doing many things, I am considering using a
> high priority interrupt for the BAM, but keeping my high priority ISR
> as small as possible (which is probably a good idea regardless). To
> accomplish this, I want to create the 8 "slices" that I will output in
> my main line, so that all the BAM ISR has to do is take that variable
> and put it on the port.
>
> My question is, what would be the best way to handle this in C? When I
> did it in assembly I used a rotate (rotate right if I remember
> correctly), then read the carry bit. But then I was also doing it at
> the moment of outputting, so there was no intermediate stored
> variable.
>
> My current thought is to define a typedef that lets me access the
> individual bits, then a bunch of if/else statements that check the bit
> of the source value, and if it's a 1 set the bit of the corresponding
> "slice" variable. This would result in a lot of if statements though,
> so I'm wondering if there's a slicker way to do this.
>
> I'm trying to avoid dropping into ASM to do this for a few reasons.
>
> Any thoughts?
>
> Thanks!
>
> Josh


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