gnupic: Re: [gnupic] sdcc/PIC howto, first draft is up
Subject:
Re: [gnupic] sdcc/PIC howto, first draft is up
From:
David McNab ####@####.####
Date:
19 Jul 2005 14:02:52 +0100
Message-Id: <42DCF9F5.5030609@rebirthing.co.nz>
Peter Onion wrote:
>>I think that having section 4.3 "I had to do it my way" section is not a
>>good idea.
I tried your approach. It worked ok for the simplest programs which
print to tty and blink the led.
(Note that I manually had to manually copy libio18f452.lib from the sdcc
source tree to the install lib dir, because that file was omitted by
'make install'.)
I then tried it on my LCDtest program, and it went off the rails. Same
for a simple program that calls printf with 6 arguments.
However, building those exact same sources using my modified crt0 and
linker script, and according to the instructions posted gave me reliable
running programs.
Until the sdcc devs and/or users more clueful than myself fix that
aspect of the toolchain and doco, I'll stand by the instructions I have
posted.
If any sdcc devs want a copy of the crashing program, please contact me
off-list and I'll send you a copy.
>>The instructions should be generic with any variations given
>>later. I don't need the modified crt0 and as a consequence your
>>istructions have left me high-and-dry.
> Right I've been working on this and here's what I've found....
> With one simple modification your "helloled.c" code can be compiled and
> linked without the need for a custom makefile or modified crt0 or linker
> script.
>
> The addition is "#pragma stack 0x200,64"
>
> With that added "sdcc -V -mpic16 -p18f452 helloled.c" is all that is
> needed to produce a helloled.hex. I havn't got my programmer working
> with 18F devices yet, but the compiled code "does the right thing" when
> run with gpsim.
>
> I think it is better to document the simplest case first and include any
> variations in the following sections of the document.
>
> Peter
>
>
>
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--
Cheers
David
