Oops, MSBit version should be:=20

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

(I had the parentheses wrong)

~ Bob Ammerman
RAm Systems

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Bob Ammerman
> Sent: Friday, August 28, 2015 8:18 AM
> To: 'Microcontroller discussion list - Public.' <piclist@mit.edu>
> Subject: RE: [PIC] XC8 Bit Technique?
>=20
> For each bit you are going to output:
>=20
> If you want LSBit first:
>=20
> 	portbit =3D output_byte & 0x01;
> 	output_byte >>=3D 1;
>=20
> For MSBit first:
>=20
> 	portbit =3D (output_byte) & 0x80 !=3D 0;
> 	output_byte <<=3D 1;
>=20
> ~ Bob Ammerman
> RAm Systems
>=20
> > -----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?
> >
> > 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
> > here:
> >
> > 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
> > --
> > 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

--=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
.