On Fri, Apr 29, 2011 at 8:51 PM, Greg KH <greg@xxxxxxxxx> wrote:
> On Fri, Apr 29, 2011 at 03:10:53PM +0530, Prashant Shah wrote:
>> Hi,
>>
>> I am trying to write a comedi (drivers/staging/comedi) based driver
>> for the National Instruments USB 6008 USB based data acquisition card.
>>
I want to ask a quick question on USB.
When I do a lsusb on the device it shows it has 4 end points (two bulk
in and two bulk out). How do I send commands to the device since there
are no control endpoints ? What I am doing currently is creating a
bulk receive pipe and trying to read data in the completion handler
but I dont get any data.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x3923 National Instruments Corp.
idProduct 0x717a
bcdDevice 1.03
iManufacturer 1 National Instruments
iProduct 2 NI USB-6008
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 46
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 0 (Defined at Interface level)
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
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 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 5
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 5
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 5
Device Status: 0x0000
(Bus Powered)
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