[wdmaudiodev] is it possible to build a USB audio device with a CONTROL/BULK/INTERRUPT only USB device controller?
- From: Aaron Phoenix <aaronphenix@xxxxxxxxx>
- To: wdmaudiodev <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 16 Nov 2004 17:54:11 -0800 (PST)
Hi all,
We are going to build a USB microphone device with a
USB device controller, which has four endpoints:
-------
Endpoint 0: 8-byte FIFO support for Control transfer;
Endpoint 1: 64-byte FIFO support for Bulk-In/Bulk-Out
transfer;
Endpoint 2: 8-byte FIFO support for
Bulk-Out/Interrupt-Out transfer;
Endpoint 3: 64-byte FIFO support for
Interrupt-In/Bulk-In Transfer.
-------
Now there is a USBD_STATUS_STALL_PID error when the
call URB_FUNCTION_SELECT_CONFIGURATION returns. Here
are the debug messages from firmware:
-------
reset
reset
[80 06 00 01 00 00 40 00] USB_DT_DEVICE, ok
reset
[80 06 00 01 00 00 12 00] USB_DT_DEVICE, ok
[80 06 00 02 00 00 09 00] USB_DT_CONFIG, ok
[80 06 00 02 00 00 FF 00] USB_DT_CONFIG, ok
[80 06 00 03 00 00 FF 00] USB_DT_STRING, ok
[80 06 02 03 09 04 FF 00] USB_DT_STRING, ok
[80 06 00 03 00 00 FF 00] USB_DT_STRING, ok
[80 06 02 03 09 04 FF 00] USB_DT_STRING, ok
[80 06 00 01 00 00 12 00] USB_DT_DEVICE, ok
[80 06 00 02 00 00 09 00] USB_DT_CONFIG, ok
[80 06 00 02 00 00 64 00] USB_DT_CONFIG, ok
-->error, firmware dectects the STALL status.
-------
This USB device controller automatically responds to
SET_CONFIGURATION/GET_CONFIGURATION/SET_FEATURE/CLEAR_FEATURE/SET_INTERFACE/GET_INTERFACE/SET_ADDRESS/GET_STATUS.
And we have made USB Mass Storage and USB HID
mouse&keyboard devices with this chip, all they work
well.
Is it possible to build a USB audio device needs
Isochronous pipes with a Bulk-only USB device
controller? How do the values of bmAttributes field of
Endpoint Descriptor affect the host&device
controllers? We need the expert opinions to decide to
give up or go on with the project. Thank you!
Regards,
Aaron M. Phoenix
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