Re: [linux-usb-devel] Grabbing characters from a Symbol barcode scanner

2007-06-05 Thread Andy Stewart
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Jiri Kosina wrote:
 On Wed, 30 May 2007, Andy Stewart wrote:
 
 I have a Symbol USB barcode scanner that appears to work with Linux.  
 If I bring up a Konsole window and give it focus, characters are typed 
 into that window as I scan barcodes. However, what I'd like to do is 
 grab those characters in a C program.  I suppose that I should be able 
 to open the proper device and the characters would be available.  
 
 Yes, just open the proper evdev interface in /dev/input/eventX and read 
 the events directly from there. See Documentation/input/input.txt, section 
 5.
 
 You can use ioctl(EVIOCGID) to obtain vendor id/product id corresponding 
 to the given input device, so you can easily look up the event device 
 corresponding to the device you are looking for.
 

HI Everybody,

I'm sorry to take so long to get back to you.  Thank you for the replies.

I hacked up some code which uses the /dev/input/eventX interface.

I have attached my code to this email.  The code seems to work for me,
and perhaps it will be useful to someone else.  Constructive critiques
are most welcome.

Thanks again for your help!

Andy

- --
Andy Stewart, Founder
Worcester Linux Users' Group (http://www.wlug.org)
Chelmsford Linux Meetup Group (http://linux.meetup.com/393)
Amateur Radio:  KB1OIQ
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/*
 * Symbol Barcode Scanner Reader Software
 * Written by Andy Stewart
 * June 5, 2007
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Set the debug variable to 1 to get some debug printouts.
 *
 * One must have the Linux kernel sources installed in order for this to compile.
 *
 * To build it:
 * gcc -o read_bc_scanner read_bc_scanner.c
 * 
 * Note: this code was tested on Linux kernel rev. 2.6.16.21 (SuSE 10.1)
 *
 */

#include stdio.h

#include sys/types.h
#include sys/stat.h
#include fcntl.h
#include string.h

#include linux/input.h

/* defined at the end of this file */
char cvt_ev_char(int);  
void debug_rcvd_event(struct input_event *);

#define MAX_IN_SIZE 30

main(int argc, char *argv[]) {

  int debug = 0;/* set this to 1 to get debug info */

  struct input_event ev[64];/* each scan causes more than one event...get them all */

  int fd = -1;  /* file descriptor for the scanner device */
  int bytes_read = 0;   /* number of bytes read by the read function */
  int i;/* loop variable */
  char scanner_in[30];  /* set this bigger if scanned input is more than 30 characters */
  char scan_char;   /* this holds one char at a time...will be concatenated into scanner_in[] */
  int wr_ptr = 0;   /* points into scanner_in so we know where to put the next scan_char */

  printf(Go ahead and scan something - press ctrl_C when finished.\n);
  printf(Look for printouts which say: Input from Scanner\n);
  printf(Ignore other printouts\n);

  /* The device interface can be found in /dev/input/by-id/*Symbol*, which should be a link
   * to /dev/input/eventN, where N is some number.  One may need to adjust the permissions of the
   * eventN file.
   *
   * Yeah, I know it sucks for me to have hardcoded this value...sorry, I was too lazy to compute it.
   */

  if ((fd = open(/dev/input/event3, O_RDONLY))  0) {
printf(Error opening file descriptor - do you have sufficient permission? Maybe it is incorrectly hardcoded - check the source. Exiting.\n);
return -1;
  }

  while (1) {
bytes_read = read(fd, ev, sizeof(struct input_event) * 64);

if (bytes_read  0) {
  printf(ERROR: can't properly read from device\n);
  return -1;
}

for (i=0; i  (int) (bytes_read / sizeof(struct input_event)); i++) {

  /* Look for a key press event */
  if ((ev[i].type == EV_KEY)  (ev[i].value == 1)) {

	if (ev[i].code != KEY_LEFTSHIFT) {
	  scan_char = cvt_ev_char(ev[i].code); /* Extract the character from the event */
	
	  if (debug) {
	debug_rcvd_event(ev[i]);
	printf(Scan char: %c\n, scan_char);
	  }

	  if (ev[i].code != KEY_ENTER) {
	scanner_in

[linux-usb-devel] Grabbing characters from a Symbol barcode scanner

2007-05-30 Thread Andy Stewart
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HI everybody,

I have a Symbol USB barcode scanner that appears to work with Linux.  If
I bring up a Konsole window and give it focus, characters are typed into
that window as I scan barcodes.

However, what I'd like to do is grab those characters in a C program.  I
suppose that I should be able to open the proper device and the
characters would be available.  Note, however, that I'd like to be able
to clearly distinguish characters coming from the barcode scanner vs.
characters from the keyboard.  That's what I don't know how to do.  I've
looked around in /sys/bus/usb and also on Google, but have not found the
answer.

Any assistance you may provide would be very much appreciated.  Please
cc me on any replies as I'm not a list subscriber.

Thanks!

Andy

- --
Andy Stewart, Founder
Worcester Linux Users' Group (http://www.wlug.org)
Chelmsford Linux Meetup Group (http://linux.meetup.com/393)
Amateur Radio:  KB1OIQ
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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-09-03 Thread Andy Stewart
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HI Alan,

I purchased a new USB 2.0 controller card which appears thus with lspci
- -v | grep -i usb:

:00:08.0 USB Controller: NEC Corporation USB (rev 43)
:00:08.1 USB Controller: NEC Corporation USB (rev 43)
:00:08.2 USB Controller: NEC Corporation USB 2.0 (rev 04)

I completely disabled the USB controller on the motherboard.

All 3 of my high speed devices (MP3 player, memory stick, and scanner)
all work just fine with this new card.  My USB 1.0 printer also works
fine.

In addition, I purchased a new USB 2.0 high speed hub and everything
works great with it.  I tried 2.6.12.3 as well as 2.6.13 - both work
just fine.

I like a happy ending.  :-)

Many thanks!

Andy

- --
Andy Stewart, Founder
Worcester Linux Users' Group
Worcester, MA, USA
http://www.wlug.org

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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-09-02 Thread Andy Stewart
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Alan Stern wrote:
 In your case, it could be that _all_ the wiring is somewhat noisy.  You 
 might try using the 2.6.13 kernel; it has improved error recovery in 
 usb-storage.

HI Alan,

I tried using the 2.6.13 kernel but the results are the same - high
speed devices work OK with OHCI or UHCI, but not with EHCI.  I'm going
to try to purchase a new add-on card this weekend to see if that will
help.  I'll report that status in a couple of days.

Thanks for your patience and the great information you've provided
during this discussion!  I've found it immensely helpful.  I hope it
will help others who discover this thread in the future.

Andy

- --
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Worcester, MA, USA
http://www.wlug.org

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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-09-01 Thread Andy Stewart
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Alan Stern wrote:
 
I'm pleasantly surprised that the speed of access is *much* faster than
on the laptop (on the order of 6x faster on writes).  My CPU goes to
100% while accessing the G3, so it makes sense to me that a much faster
processor (1.8GHz Opteron vs. 1.0 GHz Athlon) would help.  Would you agree?
 
 No.  At high (USB 2.0) speed, I/O transfers generally limited by the
 device, not by the CPU or the USB connection.  Even though your CPU usage
 shows up as 100%, it's not at all clear that the CPU is doing anything
 useful at those times.

After further experimentation, I'm no longer convinced that anything is
faster on my Opteron vs. the laptop.  I was using Konqueror to drag-drop
files to the MP3 player, and was gauging the speed based on the
Konqueror progress window.  After many experiments, the time to copy a
large file appeared to approach zero (clearly impossible).  I suspect
some sort of caching effect since a 'sync' command would typically take
several minutes to return to the command prompt.

This leads me to ask if there is an application similar to iptraf that
can show USB traffic details.

 
Now, I can't reliably access the G3 (or my Epson scanner) when it is
plugged into the EHCI port, but that is the subject of a future thread.
 
 What do you mean by the EHCI port?  Remember, on a high-speed system 
 each port is generally connected to two types of controller: the EHCI 
 controller and a companion full/low-speed UHCI or OHCI controller.  That's 
 how your motherboard is set up.
 

While doing these experiments, I was using the 'usbview' GUI.  In my
case, usbview lists 1 EHCI controller, 3 UHCI controllers, and 1 OHCI
controller.

I have 6 physical USB connectors on my system.  Usbview lists the device
underneath the controller to which it is connected.  There are only 2
connectors on my system where devices show up as being connected to the
EHCI host controller (I called those EHCI ports).  If I plug a USB 2.0
device into an EHCI port, I expect to see USB 2.0 speeds when
accessing that device (taking device limits into account).

My scanner and MP3 player support USB 2.0, and this fact is recognized
by usbview when I click on each device when it is connected to the EHCI
host controller.  However, what I have noticed is that neither my
scanner nor my MP3 player work reliably when plugged into the EHCI host
controller.  Small data transfers work OK, but large ones (perhaps  5
MB) return errors, after which the device is inaccessible until
unplugged and plugged in again (not power cycled, but dis/reconnected to
USB).

These devices work great when plugged into either the OHCI or UHCI
controller.  Why might this be?  What can I do to gather more useful
debug information?

Thanks!

Andy


- --
Andy Stewart, Founder
Worcester Linux Users' Group
Worcester, MA, USA
http://www.wlug.org

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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-08-31 Thread Andy Stewart
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HI Alan et al,

I believe that I have solved the problem (at least for USB 1.x) while
using the 2.6.12.3 kernel.  In summary, I changed two things at once
(yeah, I know I shouldn't do that):
1) I added a pci-usb controller with a different chipset
2) I compiled/installed the ehci-hcd kernel module

My USB hardware on the dual Opteron server:

# lspci -v | grep -i usb

#add on pci-usb controller
:00:08.0 USB Controller: OPTi Inc. 82C861 (rev 10) (prog-if 10 [OHCI])

# these are from the motherboard chipset
:00:10.0 USB Controller: VIA Technologies, Inc. VT82x UHCI USB
1.1 Controller (rev 81) (prog-if 00 [UHCI])
:00:10.1 USB Controller: VIA Technologies, Inc. VT82x UHCI USB
1.1 Controller (rev 81) (prog-if 00 [UHCI])
:00:10.2 USB Controller: VIA Technologies, Inc. VT82x UHCI USB
1.1 Controller (rev 81) (prog-if 00 [UHCI])
:00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86)
(prog-if 20 [EHCI])

Previously, I had neither compiled the ehci-hcd.ko module nor had I
enabled USB 2.0 on my motherboard (the motherboard allows one to select
USB 1.0 or USB 2.0).  Since the iAudio G3 supposedly supports USB 2.0, I
thought I would try enabling USB 2.0.  I compiled and loaded ehci-hcd
and now I can mount and access the iAudio G3 reliably on the UHCI and
OCHI ports.

Does it make sense that adding the ehci-hcd module should make this
suddenly work even in USB 1.x mode?

I'm pleasantly surprised that the speed of access is *much* faster than
on the laptop (on the order of 6x faster on writes).  My CPU goes to
100% while accessing the G3, so it makes sense to me that a much faster
processor (1.8GHz Opteron vs. 1.0 GHz Athlon) would help.  Would you agree?

Now, I can't reliably access the G3 (or my Epson scanner) when it is
plugged into the EHCI port, but that is the subject of a future thread.

Later, and thanks!

Andy

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http://www.wlug.org

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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-08-30 Thread Andy Stewart
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Alan Stern wrote:
At least you've ruled out the operating system version as the source of
the problem.
Well, that's not yet clear to me.  The two systems have significantly
different hardware configurations.
 
 Sure.  But all the OS versions you tried on the laptop worked, and all 
 those same OS versions on the server failed.  To me that suggests some 
 sort of hardware incompatibility rather than a version-related software 
 problem.

OK, that makes sense to me.

 
I tried 2.6.12.5 without SMP (I did not want to disturb my 2.6.12.3
setup) to no avail.  It fails in the same way.

I am wondering if something in the hotplug system would cause or remedy
this type of behavior.

Other ideas or suggestions would be *greatly* appreciated.
 
 I would be very suprised if the hotplug system was related to this in any 
 way.  One way to test that is by doing modprobe usb-storage before you 
 plug in the device.  Then there won't be any hotplug activity at all.  Try 
 it on both the server and the laptop.

I'll try this tomorrow, as I left the device at work, and I'll report
the result at that time.

 
 It's very strange.  The log indicates clearly that the device did 
 receive the command and did not send a response.  When attached to the 
 laptop it received the same command and _did_ send a response.  Why should 
 the device behave differently in the two settings?
 
 Could it be because the device is running behind a hub?  What happens if
 you remove the hub and plug the device directly into the server?

I've tried this previously and found that plugging the device directly
into the server's USB port (no hub) yields the same result we've seen.

Thanks again for the suggestions,

Andy

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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-08-27 Thread Andy Stewart
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HI Alan et al,

Here are the results of my experiments:

Sony Vaio Laptop:
  - 2.6.8.1  - iAudio G3 works fine
  - 2.6.12.3 - iAudio G3 works fine

Dual Opteron Server:
  - 2.6.8.1  - iAudio G3 does not work
  - 2.6.12.3 - iAudio G3 does not work
  - 2.6.12.5 - iAudio G3 does not work

I copied from the laptop the functioning .config file and tweaked it
only for the Opteron processor type and SMP, and then compiled the
kernel.  In each case, the device fails in the same way as previously
posted.

I've tried plugging the device into the hub as well as directly into the
USB port on my computer, each time to no avail.

Note also that I tried my USB memory stick on the Opteron server, and
that works just fine.  Therefore, I have one usb_storage device that
works and one (the iAudio G3) that does not.  I find that fact puzzling.

Are there other things I should try to help isolate this problem?

Thanks!

Andy

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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-08-26 Thread Andy Stewart
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Alan Stern wrote:
 On Wed, 24 Aug 2005, Andy Stewart wrote:
 
HI Alan et al,

I have gathered the requested debug information - shown below.

Thanks for the help!
 
 That's weird.  The log shows your device pretty much died as soon as it 
 got the first SCSI command. And yet you say it works okay on your laptop 
 with 2.6.8.1?  Can you post a log from the laptop with usb-storage 
 debugging configured on?
 
 Maybe some comparison testing would help.  What happens if you run 
 2.6.12.3 on the laptop?  What happens if you run 2.6.8.1 on the server?  
 As far as I know, there's no difference between the two versions of the OS 
 that would account for such a change in behavior.
 
 Alan Stern
 
 

HI Alan,

I installed the 2.6.12.3 kernel on my laptop, and the iAudio G3 seems to
work just fine.  I'm leary of downgrading my kernel on the dual opteron
since I had severe hang problems prior to 2.6.12.3, but I'll do it just
for this experiment, while saving my desired kernel for afterwards.

More news later.  Thanks again for the help.

Andy


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Re: [linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-08-24 Thread Andy Stewart
]: unknown command
Aug 24 17:55:21 amdtux /sbin/hotplug[15888]: unknown command
Aug 24 17:55:22 amdtux kernel: usb 1-1.3: device descriptor read/64, error -71
Aug 24 17:55:27 amdtux kernel: usb 1-1.3: device descriptor read/64, error -71
Aug 24 17:55:27 amdtux kernel: usb 1-1.3: new full speed USB device using 
uhci_hcd and address 7
Aug 24 17:55:28 amdtux kernel: usb 1-1.3: device descriptor read/64, error -71
Aug 24 17:55:33 amdtux kernel: usb 1-1.3: device descriptor read/64, error -71
Aug 24 17:55:34 amdtux kernel: usb 1-1.3: new full speed USB device using 
uhci_hcd and address 8
Aug 24 17:55:39 amdtux kernel: usb 1-1.3: device not accepting address 8, error 
-71
Aug 24 17:55:39 amdtux kernel: usb 1-1.3: new full speed USB device using 
uhci_hcd and address 9
Aug 24 17:55:44 amdtux kernel: usb 1-1.3: device not accepting address 9, error 
-71

===stop debug info ===

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[linux-usb-devel] MP3 player iAudio G3 doesn't work on 2.6.12.3

2005-08-22 Thread Andy Stewart
==

I do not know if this is a kernel problem or something else.  I am open
to experimenting to try to find the cause.  Can anybody suggest a course
of action to help solve this problem?

Thanks!

Andy

- --
Andy Stewart, Founder
Worcester Linux Users' Group
Worcester, MA, USA
http://www.wlug.org

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