Is there a .h file that I'm missing that supplies a suitable putchar()
function for the s51 simulator? If I compile this program:

#include <stdio.h>

main() {

printf("hello world\r\n");

return 0;
}

it complains about no putchar() (which I think should be an error rather than
just a warning as well!):

$ "/cygdrive/c/program files/SDCC"/bin/sdcc test1.c

?ASlink-Warning-Undefined Global '_putchar' referenced by module 'vprintf'

to indicate the lack of a putchar routine that knows where a suitable output
device (i.e. the simulator console?) is. I don't see a likely looking .h file
in the include/MCS51 directory, nor any hints in the simulator documentation
(although that isn't a suprise because its not SDCC specific). There didn't
seem to be anything relevant in the mailing list archive either. This is on
a recent (week or two old) SDCC 3.0 snapshot, but the same thing happens on
2.9.0_RELEASE.

Peter Van Epp`


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On Sat, 2010-12-11 at 17:50 -0800, Peter Van Epp wrote:
> Is there a .h file that I'm missing that supplies a suitable putchar()
> function for the s51 simulator? If I compile this program:
>
> #include <stdio.h>
>
> main()
> {
> printf("hello world\r\n");
> return 0;
> }
>
> it complains about no putchar() (which I think should be an
> error rather than just a warning as well!):

Hi,

I think that you will have to write your own putchar()
that talks to your interrupt handling for the serialport
which sends the characters out. Assuming you are using
the serialport :-)

roelof




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On Sun, Dec 12, 2010 at 10:37:18AM +0100, roelof 't Hooft wrote:
> On Sat, 2010-12-11 at 17:50 -0800, Peter Van Epp wrote:
> > Is there a .h file that I'm missing that supplies a suitable putchar()
> > function for the s51 simulator? If I compile this program:
> >
> > #include <stdio.h>
> >
> > main()
> > {
> > printf("hello world\r\n");
> > return 0;
> > }
> >
> > it complains about no putchar() (which I think should be an
> > error rather than just a warning as well!):
>
> Hi,
>
> I think that you will have to write your own putchar()
> that talks to your interrupt handling for the serialport
> which sends the characters out. Assuming you are using
> the serialport :-)
>
> roelof
>

Thanks, it looks like that is the best bet, but so far I haven't been
successfull there either :-). It looks like sdcdb won't run under Cygwin
and the simulator (which seems to be happy with Cygwin) doesn't produce any
output to a file when putchar is writing to the UART. Looks like I get to put
SDCC on a Linux or FreeBSD box and try on there ... If I get something working
I'll send a howto to the mailing list for the next poor soul :-).

Peter Van Epp


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