For each bit you are going to output:

If you want LSBit first:

	portbit =3D output_byte & 0x01;
	output_byte >>=3D 1;

For MSBit first:

	portbit =3D (output_byte) & 0x80 !=3D 0;
	output_byte <<=3D 1;

~ Bob Ammerman
RAm Systems

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Josh Koffman
> Sent: Thursday, August 27, 2015 10:10 AM
> To: Microcontroller discussion list - Public. <piclist@mit.edu>
> Subject: [PIC] XC8 Bit Technique?
>=20
> Hi all,
>=20
> 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.
>=20
> For reference, there are some great posts on BAM on the PicBasic forums
> here:
>=20
> http://www.picbasic.co.uk/forum/showthread.php?p=3D45597
> http://www.picbasic.co.uk/forum/showthread.php?t=3D10564
>=20
> 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.
>=20
> My question is, what would be the best way to handle this in C? When I di=
d
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.
>=20
> 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.
>=20
> I'm trying to avoid dropping into ASM to do this for a few reasons.
>=20
> Any thoughts?
>=20
> Thanks!
>=20
> Josh
> --
> A common mistake that people make when trying to design something
> completely foolproof is to underestimate the ingenuity of complete fools.
>         -Douglas Adams
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.