Developers for libusb-win32, which is a Win32 port of the libusb library. ()

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peter wang | 7 May 2012 08:22

[LibusbK-devel] how to read data from interrupt endpoint.

Hi all:

I wan to read data from interrupt endpoint, My firmware work is done, below is description.

Endpoint Descriptor 81 1 In, Interrupt, 2048000 us

Offset

Field

Size

Value

Description

0	bLength	1	07h
1	bDescriptorType	1	05h	Endpoint
2	bEndpointAddress	1	81h	1 In
3	bmAttributes	1	03h	Interrupt
	1..0: Transfer Type		......11	Interrupt
	7..2: Reserved		000000..
4	wMaxPacketSize	2	0008h	8 bytes
6	bInterval	1	0Fh	2048000 us

Video Control Interrupt Endpoint Descriptor

Offset

Field

Size

Value

Description

0	bLength	1	05h
1	bDescriptorType	1	25h	Video Control Interrupt Endpoint
2		3	03 08 00

I used UsbK library.

1, when I use the demo - xfer-sync to test, the program will not return when run to this line:

xfer-sync.c

success

= Usb.ReadPipe(usbHandle, EP_ADDRESS, myBuffer, sizeof(myBuffer), &transferredLength, NULL);

2, when I use the demo - xfer-async to test, the function

xfer-async.c

success

= OvlK_WaitOrCancel(myRequest->Ovl, ASYNC_TIMEOUT_MS, &myRequest->TransferLength);

will return errorno=000004C7h (The operation was canceled by the user).

and in usblyzer, it printf: URB Status USBD_STATUS_CANCELED

thanks in advance.

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peter wang | 7 May 2012 08:47

Re: [LibusbK-devel] how to read data from interrupt endpoint.

please ingnore this mail, I just found the issue, FW's problem.

thanks!

On Mon, May 7, 2012 at 2:22 PM, peter wang <peter.wang1013 <at> gmail.com> wrote:

Hi all:

          I wan to read data from interrupt endpoint, My firmware work is done, below is description.

Endpoint Descriptor 81 1 In, Interrupt, 2048000 us

Offset
Field
Size
Value
Description

0

bLength

1

07h

1

bDescriptorType

1

05h

Endpoint

2

bEndpointAddress

1

81h

1 In

3

bmAttributes

1

03h

Interrupt

1..0: Transfer Type

......11

Interrupt

7..2: Reserved

000000..

4

wMaxPacketSize

2

0008h

8 bytes

6

bInterval

1

0Fh

2048000 us

Video Control Interrupt Endpoint Descriptor

Offset
Field
Size
Value
Description

0

bLength

1

05h

1

bDescriptorType

1

25h

          Video Control Interrupt Endpoint

2

3

03 08 00



I used UsbK library.

1, when I use the demo - xfer-sync to test, the program will not return when run to this line:

xfer-sync.c

success
= Usb.ReadPipe(usbHandle, EP_ADDRESS, myBuffer, sizeof(myBuffer), &transferredLength, NULL);

2, when I use the demo - xfer-async to test, the function

xfer-async.c

success
= OvlK_WaitOrCancel(myRequest->Ovl, ASYNC_TIMEOUT_MS, &myRequest->TransferLength);
will return errorno=000004C7h (The operation was canceled by the user).

and in usblyzer, it printf: URB Status USBD_STATUS_CANCELED

thanks in advance.

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

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Libusb-win32-devel mailing list
Libusb-win32-devel <at> lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/libusb-win32-devel

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Ekkehard | 7 May 2012 09:09

Re: [LibusbK-devel] how to read data from interrupt endpoint.

Don't worry!
Often just writing down the case, opens the mind for a different approach -
and a solution is found.
On the other hand if somebody runs into the same trap, your posting may
point him/her to take a closer look in the FW
Greets Ekkehard

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View this message in context: http://libusb.6.n5.nabble.com/LibusbK-devel-how-to-read-data-from-interrupt-endpoint-tp5690302p5690360.html
Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/