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Full Discussion: Barcode scanner buffer read manipulation
Operating Systems Linux Ubuntu Barcode scanner buffer read manipulation Post 302968976 by minharojr on Wednesday 16th of March 2016 04:09:11 PM
Old 03-16-2016
CPU & Memory Barcode scanner buffer read manipulation
Hello,

I'm facing some problems with a barcode scanner from Cygnal Inc, model Sweda SL-20. Info from lsusb -v:

Code:
Bus 003 Device 003: ID 10c4:ff11 Cygnal Integrated Products, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x10c4 Cygnal Integrated Products, Inc.
  idProduct          0xff11 
  bcdDevice            1.00
  iManufacturer           1 Gue℉Ā
  iProduct                2 Gue℉Ā
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           41
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              200mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              5 (error)
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
Device Status:     0x0001
  Self Powered

If I use the scanner on Windows or Linux default programs, no problem decoding the barcodes.

But I have a POS application that when I scan a barcode seems to be too fast for the application.

I used the manual barcode codes to setup the device, but no effect.

If I scan to gedit, nano, terminal, firefox, rdp client, etc, everything works, but in this particular application doesn't. I tried to contact the supplier, but they said that the device isn't certified by them, so no support at all.

Searching on google, I found several samples codes to simulate I want, I found bash script, python c++.

What I need is a way to intercept the input device buffer and resend the input with a bigger delay between each char.

How can I do this? using curses or ncurses?

Kind regards, JP
 

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LEARN ABOUT SUNOS

usb_cfg_descr

usb_cfg_descr(9S)					    Data Structures for Drivers 					 usb_cfg_descr(9S)

NAME

       usb_cfg_descr - USB configuration descriptor

SYNOPSIS

       #include <sys/usb/usba.h>

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

DESCRIPTION

       The usb_cfg_descr_t configuration descriptor defines attributes of a configuration. A configuration contains one or more interfaces. A con-
       figuration descriptor acts as a header for the group of other descriptors describing the subcomponents (for example,  interfaces  and  end-
       points)	of  a  configuration.  Please  refer  to  Section  9.6.3  of  the USB 2.0 specification. The USB 2.0 specification is available at
       www.usb.org.

       One  or	more  configuration  descriptors  are  retrieved  from	a  USB	device	during	device	enumeration.  They  can  be  accessed  via
       usb_get_dev_data(9F).

       A configuration descriptor has the following fields:

       uint8_t	       bLength		       Size of this descriptor
					       in bytes.

       uint8_t	       bDescriptorType	       Set to USB_DESCR_TYPE_CFG.

       uint16_t        wTotalLength	       Total length of data returned
					       including this and all other
					       descriptors in this configuration.

       uint8_t	       bNumInterfaces	       Number of interfaces in this
					       configuration.

       uint8_t	       bConfigurationValue     ID of this configuration
					       (1-based).

       uint8_t	       iConfiguration	       Index of optional configuration
					       string. Valid if > 0.

       uint8_t	       bmAttributes	       Configuration characteristics
					       (See below).

       uint8_t	       bMaxPower	       Maximum power consumption, in
					       2mA units.

       Configuration descriptors define the following bmAttributes:
	    USB_CFG_ATTR_SELFPWR       -      Set if config not using bus power.
	    USB_CFG_ATTR_REMOTE_WAKEUP -      Set if config supports rem wakeup.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |PCI-based systems 	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWusbu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5),	  usb_get_alt_if(9F),	  usb_get_cfg(9F),     usb_get_dev_data(9F),	 usb_get_string_descr(9F),     usb_parse_data(9F),
       usb_ctrl_request(9S),  usb_dev_descr(9S),   usb_dev_qlf_descr(9S),   usb_ep_descr(9S),	usb_if_descr(9S),   usb_other_speed_cfg_descr(9S),
       usb_string_descr(9S)

SunOS 5.10							    5 Jan 2004							 usb_cfg_descr(9S)
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