Hi,
> For example this works:
> printf("%s", "Hello");
> But this doesn't:
> printf("%d", 7);
>
> In some case the program seems to hang, other times I only get garbage.
printf (varargs in general) are pretty easily confused by type mismatches:
Passing a 2-byte int via stack where a 1-byte char is expected can easily
break printf's output, though the remainder should remain unaffected (unless
some vararg pointer is used to write to memory, in which case a size mismatch
in any of the preceeding arguments will cause... say "interesting" results :-(
Printf has been reported to work fine; I have been using it myself successfully.
* You may try to use
PUTCHAR(char c)
{
/* output c somehow */
}
volatile int i;
i=7;
stdout=STREAM_USER;
printf("%s", i);
to make sure that a two-byte int is passed to printf.
* Also make sure you have selected a proper stdout: AFAIK, stdout is left
undefined
by default, which causes an undefined putchar routine to be used.
* You might also need to define a proper putchar routine (using the PUTCHAR
prototype macro,
see device/pic16/stdio.h) for use with STREAM_USER.
> Of course I can do this conversion by hand. But I want to check out
> the functions in the library. Am I doing something wrong? Is there a
> way to make this work?
Please try the hints above or report more detailed what you already did;
how you want to output your chars;
whether you defined PUTCHAR or not;
any other possibly helpful info ;-)
Regards,
Raphael
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