On Thu, 1 May 2014, 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!
>
> 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
>
> if (mybyte & 0b00100000) { }
>
> This generates a lot messier code than if one could just test a bit
> directly using BTST, for example.
>

Hi Larry,

Have you actually checked what the compiler produces in that case? Some=20
compilers will actually optimise that to a bit test (don't know about
XC16).

You might need to change your code slightly to help the compiler. You=20
might try something like:

if ((mybyte & 0b00100000) !=3D 0) { }

Regards
Sergio Masci
--=20
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