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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_if_descr

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

NAME

       usb_if_descr - USB interface descriptor

SYNOPSIS

       #include <sys/usb/usba.h>

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

DESCRIPTION

       The  usb_if_descr_t  interface descriptor defines attributes of an interface. A configuration contains one or more interfaces. An interface
       contains one or more endpoints.

       Please refer to Section 9.6.5 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  interface descriptor has the following fields:

       uint8_t	       bLength		       Size of this descriptor
					       in bytes.

       uint8_t	       bDescriptorType	       Set to USB_DESCR_TYPE_IF.

       uint8_t	       bInterfaceNumber        Interface number (0-based).

       uint8_t	       bAlternateSetting       Alternate setting number for
					       this interface and its
					       endpoints (0-based).

       uint8_t	       bNumEndpoints	       Number of endpoints,
					       excluding endpoint 0.

       uint8_t	       bInterfaceClass	       Interface Class code
					       (see below).

       uint8_t	       bInterfaceSubClass      Sub class code.	(See USB 2.0
					       specification of applicable
					       interface class for information.)

       uint8_t	       bInterfaceProtocol      Protocol code.  (See USB 2.0
					       specification of applicable
					       interface class for information.)

       uint8_t	       iInterface	       Index of optional string
					       describing this interface
					       Valid if > 0. Pass to
					       usb_get_string_descr(9F) to
					       retrieve string.

       USB 2.0 specification interface descriptor bInterfaceClass field
       values are as follows:

	       USB_CLASS_APP		 Application-specific interface class

	       USB_CLASS_AUDIO		 Audio interface class

	       USB_CLASS_CCID		 Chip/Smartcard interface class

	       USB_CLASS_CDC_CTRL	 CDC control interface class

	       USB_CLASS_CDC_DATA	 CDC data interface class

	       USB_CLASS_SECURITY	 Content security interface class

	       USB_CLASS_DIAG		 Diagnostic interface class

	       USB_CLASS_HID		 HID interface class

	       USB_CLASS_HUB		 HUB interface class

	       USB_CLASS_MASS_STORAGE	 Mass storage interface class

	       USB_CLASS_PHYSICAL	 Physical interface class

	       USB_CLASS_PRINTER	 Printer interface class

	       USB_CLASS_VENDOR_SPEC	 Vendor-specific interface class

	       USB_CLASS_WIRELESS	 Wireless interface class

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_cfg_descr(9S),
       usb_ctrl_request(9S), usb_dev_descr(9S), usb_dev_qlf_descr(9S), usb_ep_descr(9S), usb_other_speed_cfg_descr(9S), usb_string_descr(9S)

SunOS 5.10							    5 Jan 2004							  usb_if_descr(9S)
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