Patrick Boettcher wrote: > I'm using a usbsnoop program to do some basic sniffing. Logs are > really big :/.
Try to play some 0.01-seconds wave file, and don't connect any other USB devices. > After plugging in, the device shows like this in /proc/bus/usb/devices: > > I: If#= 0 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) > I: If#= 1 Alt= 0 #EPs= 0 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) > I: If#= 1 Alt= 1 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) > E: Ad=81(I) Atr=05(Isoc) MxPS= 304 Ivl=1ms > E: Ad=02(O) Atr=05(Isoc) MxPS= 304 Ivl=1ms Class 0xff means vendor-specific. This is not a "USB Audio Device" as defined in the USB specifications. What sample rate/format uses 304000 bytes per second? > After talking to some more experienced guys, I know, that there has to be > a sound chip, so I opened the device and among some A/D and D/A converter > I found a "cs8427" chip. I suppose this is the one. > After looking into sound directory in linux, I saw "i2c/cs8427.c" and > "i2c/cs8427.h". > > 1. How should a go on? Output of "lsusb -v"? > 2. Can I use somehow the i2c/cs8427.c? Probably not. The CS8427 will be connected (via I2C) to some USB interface/controller chip. Can you determine which one? > 3. How does communication with the device should work? Sending/receiving sample data should work, but I guess this device needs vendor-specific commands to configure it. These are control transfers, not isochronous; please look in the log file for them. HTH Clemens ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
