[sdiy] was how_you_got_started...

[Vinicius Brazil]

I add the same experiences that Tom, Jay and Scott if dsPIC.
write in assembly on dsPIC for those with 40 years of assembly is like
writing a letter. I can not say the same for C ...

- Vinicius Brazil
brazil.v at gmail.com
VBrazil Systems


On Sat, Sep 26, 2015 at 5:27 AM, Tom Wiltshire <tom at electricdruid.net>
wrote:

> +1 Agree with Scott and Jay. I've had the same experience.
>
> I like assembler, especially on dsPIC, and I find C a pain in the neck.
> Header files! What are they good for?!? Ack!
>
>
> On 26 Sep 2015, at 03:31, Scott Gravenhorst <music.maker at gte.net> wrote:
>
> > "Jay Schwichtenberg" <jays at aracnet.com> wrote:
> > >A lot depends on the DSP you are using. If you are using a higher end
> >DSP that has pipe lines and multiple ALUs then using the C compiler >will
> get you the best performance unless you're some sort of uber >programmer.
> There are way too many things going on in those processors >to keep track
> of and the compilers have been optimized to handle that >stuff. But for the
> smaller DSPs like the MicroChip ones assembly
> > >language is the way to go if you really want the performance.
> > >
> > >Jay S.
> >
> > Yes, I found this to be true by doing it.  I've been able to write a
> nice additive flute model monosynth for dsPIC33F in C, but my best efforts
> at polysynths are in assembly language.  The main issue for me is the fact
> that there is no native data type support for 16 bit fixed point
> arithmetic.  Worse yet is that sometimes designs need more than one
> definition for 16 bit fixed point.  Usually 1.15 works, but there are times
> other configurations are necessary.  This is rather difficult and at least
> ugly in C even using typedef etc.  Just ugly.  And in C I had to write
> several functions in assembly language anyway that handle the use of DSP
> instructions because they are not used by the C compiler even if it's
> logical to do so.  At least in my experience...  can anyone tell me how to
> make an FIR filter in C30 that uses the MAC instruction... ??
> >
> > Anyway, what Jay said about assembly language being the way to go.
> >
> > --Scott G
> >
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