Re: [Sdcc-user] printf with pic14 [WAS: [Sdcc-user] Multiplication problems on SDCC for PICs]

[Raphael N. <RN...@we...>]

Hi folks,

> Have you written an implementation of the putchar() function for your
> hardware implementation?
> 
> Due to the many varied ways in which printf() could be used, for
> example: RS232 comms to displaying on a 2x40 character LCD display, you
> need to define your own putchar() function which is utilised by printf()
> when it needs to display a character.

This will certainly work some day -- right now, the pic14 library is
virtually non-existant.
At the moment you will have to grab a printf-implementation of your
choice (try device/lib/ or device/lib/pic16/libc/libio/ for some
microcontroller versions), and insert it (a) directly in your code or
(b) into a new .c file. In the latter case you will need to link the
resulting .o file with your main program...
Depending on your printf-version you might still need to provide a
putchar which actually emits a char "somewhere".

>>Hi,
>>I doownloaded the sdcc-snapshot-i586-mingw32msvc-20050926
>>and when I try to compile a test source I give this error:
>>
>>C:\projeto\testesdcc>sdcc -mpic14 -p16f877 main.c
>>Processor: 16f877
>>main.c:4: warning 85: in function putchar unreferenced function
>>argument : 'c'
>>message: using default linker script "C:\Program Files\gputils\lkr
>>\16f877.lkr"
>>error: missing definition for symbol "_printf", required by "main.o"
>>
>>C:\projeto\testesdcc>
>>
>>Is not possible to use printf with pic14?

There is still some work to be done to make this more convenient, sorry.

Regards,
	Raphael Neider