Re: [Sdcc-user] pic16 - printf() - error: multiple sections using address 0

[Raphael N. <ne...@te...>]

Hi again,

> #pragma stack 0x00 64
> 
> $ sdcc -mpic16 -p18f452 -llibc18f.lib test.c
> Processor: 18f452
> message: using default linker script
> "/home/daryl/local/share/gputils/lkr/18f452.lkr"
> error: multiple sections using address 0
> 
> I must be missing something obvious here.

Indeed: you placed the stack at adresses 0 .. 63 (into the access bank).
The area 0..~30 is used by the compiler for local variables. I propose
to relocate the stack to something like
#pragma 0x300 0xff
effectively reserving the fourth bank for stack (0x300..0x3FF), just
because 4 is a good number (and all pics have at least 4 banks of mem).

> I've also tried using printf_tiny() and defining my own putchar() as
> described in the docs. No luck.
> 
> When I try to do it with -p18f1220 I get a different error:
> 
> error: missing definition for symbol "_SSPBUF"
> 
> The SSPBUF issue appears to stem from the fact that there is no ssp on
> the 18f1220 but the library code assumes there is. Also, building lib-io
> is broken for the 18f1220 because of no i2c support.

Regarding _SSPBUF: no idea (yet) - sorry :-(, can you safely ignore the
failing sources (renaming them to *.c__ or something)?

I have changed libio/Makefile to support exclusion of subdirectories for
   certain pics by creating files "${dir}.ignore" and putting their id
(e.g. "1220") ni there. Having a file i2c.ignore with "1220" in it will
no longer build the i2c library for the p18f1220.
This enables the libraries to build (though incompletely)...

The attached files belong into device/lib/pic16/libio - maybe they help 
a bit...

Regards,
    Raphael