Re: usb2: no sound with M-Audio Transit
- From: Hans Petter Selasky <hselasky@xxxxxxx>
- Date: Sun, 16 Nov 2008 11:31:38 +0100
On Saturday 15 November 2008, Hans Petter Selasky wrote:
On Saturday 15 November 2008, Stefan Ehmann wrote:
On Friday 14 November 2008 18:11:23 Hans Petter Selasky wrote:
On Friday 14 November 2008, Stefan Ehmann wrote:
http://stud4.tuwien.ac.at/~e0125637/fbsd/transit_config.dump
Maybe there is something wrong with the 16-bit to 24-bit data
conversion ?
One more thing:
I'm using dfu-util for the firmware download. See
http://svn.openmoko.org/trunk/src/host/dfu-util/
The second usb_claim_interface() call fails. But that doesn't seem to
be fatal. If I comment out the exit() the download succeeds.
Here's the output:
dfu-util - (C) 2007-2008 by OpenMoko Inc.
This program is Free Software and has ABSOLUTELY NO WARRANTY
Opening USB Device 0x0000:0x0000...
Claiming USB DFU Runtime Interface...
Determining device status: state = dfuIDLE, status = 0
WARNING: Runtime device already in DFU state ?!?
Found Runtime: [0x0763:0x2806] devnum=0, cfg=0, intf=0, alt=0, name="RAM"
Claiming USB DFU Interface...
Cannot claim interface: Unknown error
Setting Alternate Setting ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
Transfer Size = 0x0040
bytes_per_hash=112
Starting download: [##################################################]
finished!
state(7) = dfuMANIFEST, status(0) = No error condition is present
state(2) = dfuIDLE, status(0) = No error condition is present
Done!
can't detach: Unknown error
Resetting USB to switch back to runtime mode
error resetting after download: Unknown error
The problem is that after the download the device needs to be reset so
it gets recognized as uaudio device. This was not implemented in the
libusb from sourceforge for BSD.
As a workaround you can slightly unplug the cable (I think I read this on
some netbsd list) which works but is not very convenient.
The reset in dfu-util fails, possibly due to preceding errors.
I also tried it with usbconfig:
# usbconfig -u 0 -a 2 reset
usbconfig: could not reset device: Device not configured
And this error in dmesg
usb2_req_re_enumerate:1362: addr=2, getting device descriptor failed!
This is not critical but it would be nice to get rid of this ugly
workaround.
Hi,
The problem is that the device changes its configuration descriptor and the
reset implementation assumes that the configuration descriptor is the same
after the reset. I will see if I can make a patch for this. I have the same
problem when flashing the openmoko.
I will make a patch for this by tomorrow.
Hi,
Could you try to checkout the latest sources from my private SVN, recompile
libusb20, usbconfig, USB2 modules and give all your USB devices a try?
svn --username anonsvn --password anonsvn \
checkout svn://svn.turbocat.net/i4b
The problem about 24-bit audio is not solved yet, but I hope that the device
reset should work.
--HPS
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