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IVP wrote:
> can I have recommendations please for floating point and fixed point
> assembly routines for 16F or 18F

There are 32 bit fixed point and 24 bit floating point routines included in
my PIC development environment.  See http://www.embedinc.com/pic/dload.htm.
Look in the SOURCE > PIC directory after software installation.

The 24 bit floating point source files all have "fp24" in their name
somewhere.  The description of the floating point format is in
FP24FLT.INS.ASPIC, and I have also attached it.  This floating point format
is handy for most things a PIC will do.  It only has 16 bits of precision,
but that's plenty when values come in as 12 bit A/D readings and go out as
10 bit PWM duty cycle values.  The routines also don't bother with all the
NaN stuff, which is a silly waste of cycles in a small embeddd system
dealing with real world data.  The arithmetic routines saturate as necessar=
y
but otherwise keep on going.

The 32 bit fixed point routines don't have consistent naming conventions.
There are names like ADDA, SUBA, MULU, DIVU, and probably a few others.
Look around.

All of this code assumes my PIC development environment, of course.  It
would be a good idea to start using it in general, although there will be a
bit of a learning curve to get started.  All these routines rely on my
general register model, usually REG0-REG12 on a PIC 16 and REG0-REG15 on a
PIC 18.  The first 4 registers are also grouped together and called REGA,
then REGB and REGC, for most of the wide data math routines.

> Project requires * and / plus trig functions in the range 0.0000 to
> 180.0000, which I think fixed point would be sufficient for

I haven't implemented trig yet for 8 bit PICs as it hasn't come up in that
form yet.  However, I'd do that with a lookup table where a full circle is
represented as a power of 2.  The lookup table contains one quadrant of a
sine.  The high bit of the angle then specifies whether to negate the
result, and the next lower bit which direction to index into the table.  Th=
e
table would have 2**N intervals, so the next N lower angle bits identify th=
e
first table entry and the remaining lower angle bits the interpolation
fraction.

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