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Old 04-23-2007, 01:57 AM   #1
bricedebrignaisplage
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Registered: Apr 2006
Location: singapore
Distribution: debian
Posts: 51

Rep: Reputation: 16
redirecting the output of a USB barcode scanner (= USB keyboard)


Hi

I have a USB barcode scanner that acts like a keyboard: whenever a
barcode is read it sends the code where the keyboard would normally write.
I would like to redirect the output to /dev/rtfX (RTAI FIFO).

What I do know is to read from the USB barcode scanner using libhid and
write to the FIFO using dedicated API. However, it's a bit complicated,
and I have the feeling that the result could be obtained with very few
lines of code.

MardukKurios suggested this:
They normally configure as a keyboard, though in Linux, by default, some
of the COM ports may not be accessible. Add "8250.nr_uarts=8" to the end
of your kernel line to have it configure past COM4. I.E.:
kernel /boot/vmlinuz-2.6.15-1.2054_FC5 ro root=LABEL=/ 8250.nr_uarts=8
If you cat /dev/ttySX (X is the number of the COM port you want to listen
to) and scan something, you should see input.

This seems like a good idea, but unfortunately 8250.nr_uarts is not an
option recognized by my kernel. However, this suggests that what I want to
do should be possible.

Does anybody have an idea?

Thanks,
Brice

PS: dmesg shows this
usb 2-1: new full speed USB device using uhci_hcd and address 3 input: �
Symbol Technologies, Inc, 2000 Symbol Bar Code Scanner as
/class/input/input3 input: USB HID v1.10 Keyboard [� Symbol
Technologies, Inc, 2000 Symbol Bar Code Scanner ] on usb-0000:00:1d.0-1
 
Old 06-10-2009, 07:26 PM   #2
ellappan
LQ Newbie
 
Registered: May 2009
Posts: 14

Rep: Reputation: 0
Quote:
Originally Posted by bricedebrignaisplage View Post
Hi

I have a USB barcode scanner that acts like a keyboard: whenever a
barcode is read it sends the code where the keyboard would normally write.
I would like to redirect the output to /dev/rtfX (RTAI FIFO).

What I do know is to read from the USB barcode scanner using libhid and
write to the FIFO using dedicated API. However, it's a bit complicated,
and I have the feeling that the result could be obtained with very few
lines of code.

MardukKurios suggested this:
They normally configure as a keyboard, though in Linux, by default, some
of the COM ports may not be accessible. Add "8250.nr_uarts=8" to the end
of your kernel line to have it configure past COM4. I.E.:
kernel /boot/vmlinuz-2.6.15-1.2054_FC5 ro root=LABEL=/ 8250.nr_uarts=8
If you cat /dev/ttySX (X is the number of the COM port you want to listen
to) and scan something, you should see input.

This seems like a good idea, but unfortunately 8250.nr_uarts is not an
option recognized by my kernel. However, this suggests that what I want to
do should be possible.

Does anybody have an idea?

Thanks,
Brice

PS: dmesg shows this
usb 2-1: new full speed USB device using uhci_hcd and address 3 input: �
Symbol Technologies, Inc, 2000 Symbol Bar Code Scanner as
/class/input/input3 input: USB HID v1.10 Keyboard [� Symbol
Technologies, Inc, 2000 Symbol Bar Code Scanner ] on usb-0000:00:1d.0-1
Hi...


I also want to read from barcode reader. I tried to read from it is device descriptor at /dev/input/by-id/kbd. But I am receiving scan code with the original input. Please can you help me to read barcode scanner using hid lib? ...Thanks in advance it will really help me.
 
  


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