OESF Portables Forum

Model Specific Forums => Sharp Zaurus => Zaurus - pdaXrom => Topic started by: jgzhang on May 24, 2005, 06:43:14 am

Title: No Isochronous Mode For Racto Cfu1?
Post by: jgzhang on May 24, 2005, 06:43:14 am

Hi everyone.

I have a Ratoc CFU1 USB host card for my C860. The driver I am using is cfu1-driver_0.0.2-3 from

http://paipai.org/~humorum/pukiwiki/pukiwi...ZaurusCfu1_dist (http://paipai.org/~humorum/pukiwiki/pukiwiki.php?ZaurusCfu1_dist).

I am trying to connect a usb webcam to the PDA. The camera can be detected  by the proper driver (e.g. pwc.o for Philips webcam). However if I try to get video from the camera it just suspends. After some debuging I found the problem is that the current driver hc_sl811.o and sl811_cs.o does not support USB isochronous transfer mode.

From the Racto website (http://www.ratocsystems.com/english/support/faq/cfu1u.html) I read this:

*The CFU1U does not work with the Web Camera using isochronous transfer

But it's really difficult to find a usb webcam that does NOT use isochronous transfer mode.

Could anyone tell me if this can be solved by developing new isochronous-enabled device driver for CFU1, or it's really a hardware limitation of this product? Thanks in advance!

Title: No Isochronous Mode For Racto Cfu1?
Post by: lardman on May 24, 2005, 07:30:29 am

Take a look at the driver in the 2.6 kernel source, iirc someone was saying that this driver might be able to perform isochronous transfers.

I've been meaning to try it out with my webcam when I have a free minute (running GPE on C750 w/ 2.6.12 kernel).


Si

Title: No Isochronous Mode For Racto Cfu1?
Post by: jgzhang on May 24, 2005, 10:58:26 pm

Thanks for the reply and pls let me know if there is some hope under kernel 2.6.