On Thu, May 01, 2014 at 03:52:14PM -0400, Larry Bradley wrote:
> Can anyone point me to some examples of in-line assembly code for the
> XC16 compiler (I'm using a PIC24H ...). The Microchip docs don't tell me
> much, and I've Googled until my fingers are sore!
>=20
> What I'm trying to do is make up for the fact the C doesn't give you
> access to the bits of a byte. To determine if a bit is set, one has to
> use a mask, as in=20
>=20
> if (mybyte & 0b00100000) { }
>=20
> This generates a lot messier code than if one could just test a bit
> directly using BTST, for example.

What you are looking for are bit-fields. They are described in section
8.6.2 on page 119 of the XC16 manual. Your code above would be something
like:

if (mybyte.redflag) { }

where you'd define mybyte as a struct with bit-fields.

BAJ

>=20
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> Orleans (Ottawa) Canada=20
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Byron A. Jeff
Chair: Department of Computer Science and Information Technology
College of Information and Mathematical Sciences
Clayton State University
http://faculty.clayton.edu/bjeff
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