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Forum Index : Microcontroller and PC projects : Pic 32 Asm code for Micromite ?

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plasma
Guru

Joined: 08/04/2012
Location: Germany
Posts: 437
Posted: 12:31am 23 Sep 2014
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Hi ,
Is anyone good in Asm for pic32?
I fear my c routine for the ledstripe is a little
Bit to slow , its not tested yet but is c to slow i
Need to go with asm and will glad about any help.
Btw : if all working it will be free as ever
Thx
 
JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4004
Posted: 12:55am 23 Sep 2014
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Which C compiler have you used and with which options (switches)?

How is the hardware arranged? (Interfaces, speed, etc.)

What is the C that you want to speed up? Often a better algorithm will make a much bigger improvement...

JohnEdited by JohnS 2014-09-24
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3272
Posted: 03:26am 24 Sep 2014
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C compilers are pretty good these days, I have long stopped trying to optimise my code by using assembler segments. Often the compiler output was better than my assembler.

My advice is to stick with C, if it is not fast enough then nothing else will be either.

Geoff
Geoff Graham - http://geoffg.net
 
plasma
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Joined: 08/04/2012
Location: Germany
Posts: 437
Posted: 04:43am 26 Sep 2014
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Maybe you are right Geoff .
And John i will test the speed and hope all is ok
 
G8JCF

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Joined: 15/05/2014
Location: United Kingdom
Posts: 676
Posted: 02:30pm 26 Sep 2014
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To echo Geoff's sentiments.

MIPS assembler was never designed to be human coded - it's really quite "horrible" and human-unfriendly. Even the GCC compiler sometimes has trouble generating the truly best optimised code. Any comparison or thought that PIC32 assembler is like 80x86/68x000 etc would soon hit ugly reality.

Rely on GCC, and if it's not quick enough for your application, then you probably need to redesign your algorithm(s) and/or move up a processor range.

I wish that it wasn't so, but the days of hand-coded assembler have all but vanished (very sadly).

Peter
The only Konstant is Change
 
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