[alsa-devel] TASCAM US-1641

[Jan Depner]

On Thu, 2010-03-25 at 11:00 +0100, Karsten Wiese wrote:
> Am Mittwoch 24 März 2010 schrieb Jan Depner:
> > 
> > 
> > > I suggest adding some printk()s to the driver and see what it actually
> > > does and which values it passes around. Most probably there is more
> > > differences in the data format, and descriptors and/or message blocks
> > > have different meanings for this hardware model.
> > > 
> > 
> >     I did as suggested and got back reasonable appearing numbers for
> > rate, use_packsize, and period_frames of 44100, 36, and 256 respectively
> > but am not sure how to relate this to my interface.
> 
> I heard the US-1641 uses bulk and/or iso packets, while US-122L uses iso only.
> so snd_usb_us122l would need some deep tweaking.
> also all the incantation stuff looks propably different.
> 

    Sounds complicated ;-)


> > Is there some
> > documentation somewhere that would explain the output of lsusb -v with
> > respect to variable names in us122l.c.
> 
> erm, no. there are the interface and endpoint numbers.
> 
> > My problem here is that I don't
> > know what would actually be reasonable for this interface nor how to
> > find out.
> 
> usbsnoop and/or the developers at http://usbaudio.com.
> >

    I've got usbsnoop and UsbSnoop on Windows.  Would the guys at
usbaudio actually help out???  It seems counterintuitive.


>  
> > 
> >     Many thanks for your help with this.  Karsten had asked me to get
> > back with him if I got one of these but my email to him must have gone
> > to the spam filter as I haven't heard anything.
> 
> no spam filters, just work and short hollidays.


    I know how that is ;-)


> 
> looking back at developing snd_usb_us122l, i'm unsure if I spent my time wisely:
> the actual hardware one can buy now doesn't talk to the driver anymore. and i'm
> busy caring for real life, which i've been omitting a tad too much that time.
> 
> If in doubt, don't bother hacking on the tascam, enjoy spring instead!
> 
> 

    Probably the best advice ever ;-)


> regards,
> Karsten