nanogui: problems reading the buttons on the helio in VR Linux
Subject:
Re: problems reading the buttons on the helio in VR Linux
From:
Robert Hartley ####@####.####
Date:
29 Dec 2000 15:38:15 -0000
Message-Id: <3A4CB0A1.BB56076B@ics.com>
Jordan,
Thanks for the reminder.
I did what you suggested, and it said "No such Device"
Whenever I pross or release any of the buttons, I get messages on the screen
like:
"13 1 0:0 10:00 P00 0" followed by
"13 1 0:0 00:10 P00 0"
when pressing the up button on the side.
I am thinking that the kernel version I have is an old one from the August
Linux World on San Jose, and that the latest version will be much improved.
I am downloading the latest from the VR Linux CVS and the pocketlinux.com
sites, so I hope it will go away.
If you have seen this before, please let me know,
Thanks again for your help,
Robert
Jordan Crouse wrote:
> Robert -
>
> Toss in a perror() function when the open fails, which will report the
> error that was passed back from open().
> That will tell you right away whats wrong.
>
> Jordan
>
> Robert Hartley wrote:
> >
> > Hello,
> >
> > I whipped up the attached test file to try reading the button keys on
> > the Helio running VR Linux from TVT. (pocketlinux)
> >
> > It keeps telling me that it cannot open the file /dev/r39xxbuttons
> >
> > I tested the same file by creating a named pipe using mknod called
> > /dev/r39xxbuttons on a standard RH v6.2 Intel system that worked.
> >
> > What am I doing wrong?
> >
> > (Is there already a process that has this file open?)
> >
> > thanks for your help,
> >
> > Robert
> >
> > --
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> > = Robert Hartley Mail: 201 Broadway =
> > = Central Region Systems Engineer Cambridge, MA 02139 =
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> >
> > ------------------------------------------------------------------------
> > /*
> > Simple button test program built with the following two lines:
> > mipsel-linux-gcc -static helio-test.c -o helio-test
> > mipsel-linux-strip helio-test
> > */
> > #include <stdio.h>
> > #include <fcntl.h>
> >
> > char *button_fn = "/dev/r39xxbuttons";
> > char ch;
> >
> > int main(int argc, char *argv[])
> > {
> > int fd = open(button_fn, O_RDONLY);
> >
> > if(fd == -1)
> > {
> > fprintf(stderr, "Unable to open file: %s\n", button_fn);
> > exit(0);
> > }
> >
> > while(read(fd, &ch, 1) > 0)
> > {
> > fprintf(stderr, "ch = %c = (int) %d\n", ch, (int) ch);
> > }
> >
> > close(fd);
> > fprintf(stderr, "Finished reading.\n");
> >
> > } /* main() */
> >
> > ------------------------------------------------------------------------
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--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
= Robert Hartley Mail: 201 Broadway =
= Central Region Systems Engineer Cambridge, MA 02139 =
= Integrated Computer Email: ####@####.#### =
= Solutions, Inc. Web Site: www.ics.com =
= Tech Support: ####@####.#### Phone: 800-800-4271 =
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Visit the MotifZone (www.motifzone.org) for info on Motif!
