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Post subject: usbd_open_pipe
 Posted: Jul 06, 2007 - 03:22 PM
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New Member
Joined: Jul 06, 2007
Posts: 5
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Hi,
I am trying to writing code to open and interact with the USB stack. When I call usbd_open_pipe, it works properly for the control endpoint and the Bulk Out endpoint, but not for the Bulk In endpoint.
I know that the device I am using is a Bulk Input/Output device. Below is a part of the output form usb -vvv.
Configurations : 1
Configuration : 1
Attributes : 0x80 (Bus-powered)
Max Power : 60 mA
Interfaces : 1
Interface : 0 / 0
Class : 0xff (Vendor-specific)
Subclass : 0xff
Protocol : 0xff
Endpoints : Control + 2
Endpoint : 0
Attributes : Control
Max Packet Size: 8
Endpoint : 1
Attributes : Bulk/IN
Max Packet Size: 64
Endpoint : 2
Attributes : Bulk/OUT
Max Packet Size: 64
I am using the following code to access the endpoints.
endpt0 = usbd_endpoint_descriptor(device, 1, 0, 0, 0, &node);
if(endpt0 == 0)
printf("control error \n");
endpt1 = usbd_endpoint_descriptor(device, 1, 0, 0, 1, &node);
if(endpt1 == 0)
printf("Bulk IN error \n");
endpt2 = usbd_endpoint_descriptor(device, 1, 0, 0, 2, &node);
if(endpt2 == 0)
printf("Bulk OUT error \n");
I would be very grateful, if anybody could help me with this problem. Thank you so much. |
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Post subject: RE: usbd_open_pipe
Posted: Jul 06, 2007 - 03:31 PM
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New Member
Joined: Jul 06, 2007
Posts: 5
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I missed adding some code to the above message. Here it is:
res0 = usbd_open_pipe(device, endpt0, &pipe_ctrl);
if(res0 != EOK)
printf("Control error \n");
res1 = usbd_open_pipe(device, endpt1, &pipe_in);
if(res1 != EOK)
printf("Bulk IN error \n");
res2 = usbd_open_pipe(device, endpt2, &pipe_out);
if(res2 != EOK)
printf("Bulk OUT error \n");
Thanks again. |
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