USB Audio
 

I've done a lot of searching and found a lot of posts that suggest it will work, but I haven't been able to make it work.

Here is what I want to do. I have a Dared USB amplifier. I would like to connect it to the n800 to play my music collection and Rhapsody. It appears as if there is no driver in OS2008 that recognizes the Burr-Brown DAC in the Dared.

If you haven't heard the Dared, it is an amazing little piece of hardware designed to make good music out of a USB stream. The Dared has a Burr-Brown DAC and works without any special software under WinDoze. I haven't tried it with a Linux PC but if I need to, I will find a way.

Here's the error I get on the screen of the N800 when I perform the
echo host > .../mode command.

Unable to Connect. No filesystem available.

Here is the dmesg output:

[383428.070312] tusb_source_power 629: VBUS a_wait_vrise, devctl 81 otg 184 conf c0010001 prcm 00a80500
[383428.242187] musb_stage0_irq 646: CONNECT (a_host) devctl 5d
[383428.242187] hub 1-0:1.0: state 8 ports 1 chg 0000 evt 0000
[383428.242187] usb usb1: usb auto-resume
[383428.242187] usb usb1: finish resume
[383428.242187] hub 1-0:1.0: hub_resume
[383428.265625] hub 1-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
[383428.421875] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
[383428.546875] usb 1-1: new full speed USB device using musb_hdrc and address 2
[383428.679687] usb 1-1: ep0 maxpacket = 8
[383428.679687] usb 1-1: skipped 4 descriptors after interface
[383428.679687] usb 1-1: skipped 2 descriptors after interface
[383428.679687] usb 1-1: skipped 1 descriptor after endpoint
[383428.679687] usb 1-1: skipped 2 descriptors after interface
[383428.679687] usb 1-1: skipped 1 descriptor after endpoint
[383428.679687] usb 1-1: default language 0x0409
[383428.679687] usb 1-1: new device strings: Mfr=1, Product=2, SerialNumber=0
[383428.679687] usb 1-1: Product: Burr-Brown Japan PCM2702
[383428.679687] usb 1-1: Manufacturer: Burr-Brown Japan
[383428.679687] usb 1-1: device v08bb p2702 is not supported
[383428.679687] usb 1-1: uevent
[383428.679687] usb 1-1: usb_probe_device
[383428.679687] usb 1-1: configuration #1 chosen from 1 choice
[383428.679687] usb 1-1: adding 1-1:1.0 (config #1, interface 0)
[383428.679687] usb 1-1:1.0: uevent
[383428.679687] usbtest 1-1:1.0: usb_probe_interface
[383428.679687] usbtest 1-1:1.0: usb_probe_interface - got id
[383428.687500] usb 1-1: adding 1-1:1.1 (config #1, interface 1)
[383428.687500] usb 1-1:1.1: uevent
[383428.687500] usbtest 1-1:1.1: usb_probe_interface
[383428.687500] usbtest 1-1:1.1: usb_probe_interface - got id
[383428.687500] drivers/usb/core/inode.c: creating file '002'
[383428.687500] hub 1-0:1.0: 200mA power budget left
[383428.687500] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[383428.687500] hub 1-0:1.0: port 1 enable change, status 00000103
[383429.898437] cx3110x: PSM dynamic with 200 ms CAM timeout.
[383430.687500] usb 1-1: usb auto-suspend
[383432.710937] hub 1-0:1.0: hub_suspend
[383432.710937] usb usb1: usb auto-suspend
[383443.820312] EAC mode: play enabled, rec enabled
[383447.429687] EAC mode: play disabled, rec disabled


I assume that I need a driver that recognizes generic USB audio devices. I also need to know how to see the output device with Rhapsody. Are there other music player applications that allow you to specify an output device?

Of course, when I try to play music through the unit, it won't play, so I know something in audio registered.

Anybody have any luck doing this?

G

Re: USB Audio
 

headfier?

can't say that i can help you, but i can root you on!

Re: USB Audio
 

any progress? would be itneresting to see if USB DACs work

Re: USB Audio
 

I haven't made any progress yet myself except to come to the conclusion that I need to compile a new audio driver that includes USB audio functionality.

I suspect this isn't hard, but I haven't had time to set up the environment and figure out what I am doing:-}

If someone else does, I'd love a clue as to how to best get started. It is a busy time right now, so I hope to start after finishing the taxes (.. and the mother's taxes, and the mother-in-laws taxes, and ...).

I'm an engineer, not a tax man, Jim.
g

Re: USB Audio
 

does the dared require any drivers normally? there are some dacs that work on mac, linux and windows without any aditional **** installed

Re: USB Audio
 

No. In Windows, it just shows up as "USB Audio Device". My Logitech headphones produce a very similar output:

[1468982.398437] usb 1-1: new device strings: Mfr=1, Product=2, SerialNumber=0
[1468982.398437] usb 1-1: Product: Logitech USB Headset
[1468982.398437] usb 1-1: Manufacturer: Logitech
[1468982.398437] usb 1-1: device v046d p0a01 is not supported
[1468982.398437] usb 1-1: uevent
[1468982.398437] usb 1-1: usb_probe_device
[1468982.398437] usb 1-1: configuration #1 chosen from 1 choice
[1468982.398437] usb 1-1: adding 1-1:1.0 (config #1, interface 0)
[1468982.398437] usb 1-1:1.0: uevent
[1468982.398437] usbtest 1-1:1.0: usb_probe_interface
[1468982.406250] usbtest 1-1:1.0: usb_probe_interface - got id
[1468982.406250] usb 1-1: adding 1-1:1.1 (config #1, interface 1)
[1468982.406250] usb 1-1:1.1: uevent
[1468982.406250] usbtest 1-1:1.1: usb_probe_interface
[1468982.406250] usbtest 1-1:1.1: usb_probe_interface - got id
[1468982.406250] usb 1-1: adding 1-1:1.2 (config #1, interface 2)
[1468982.406250] usb 1-1:1.2: uevent
[1468982.406250] usbtest 1-1:1.2: usb_probe_interface
[1468982.406250] usbtest 1-1:1.2: usb_probe_interface - got id
[1468982.406250] drivers/usb/core/inode.c: creating file '004'
[1468982.406250] hub 1-0:1.0: 100mA power budget left
[1468982.406250] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[1468982.406250] hub 1-0:1.0: port 1 enable change, status 00000103
[1468983.562500] cx3110x: PSM dynamic with 200 ms CAM timeout.
[1468984.406250] usb 1-1: usb auto-suspend
[1468986.429687] hub 1-0:1.0: hub_suspend
[1468986.429687] usb usb1: usb auto-suspend
[1468996.875000] EAC mode: play enabled, rec enabled

So, I'm making a gross assumption based on two devices that OS2008 isn't going to recognize USB audio devices.

Do I need to do a more granular analysis?

g

Re: USB Audio
 

I have been having the exact same problem with the Headroom Total Bithead (USB DAC/amp). I have been trying to wrap my head around this for a while, and I have come up completely blank. I have some familiarity with linux and, by default, ALSA contains the drivers for USB DACs like the dared, but for some reason the version implemented in OS2008 does not. I have been trying to simply recompile ALSA but have failed rather miserably.
-- Tarag

Re: USB Audio
 

sure its not a problem with power? have anyone tried connecting the dac through a powered hub?

Re: USB Audio
 

Nope, not a power problem; it claims to have plenty of power. Unless the headphones are lying about their power req'ments, but even so, there would be messages about over-current. (I think.)

Re: USB Audio
 

I dont pretend to understand any of that, but from
[383443.820312] EAC mode: play enabled, rec enabled
[383447.429687] EAC mode: play disabled, rec disabled
doesnt it look like it does work then disconnects for some unkown reason?