2011-06-14 08:14:33 Error in g_zero? (Gadget usb)

Morten Kvistgaard (DENMARK)

Message: 101253

Hello there,

We're trying to implement some device side usb on BF526 ezbrd. We can make the g_serial work. But the MS Windows driver for that one has some serious faults. So we're trying to use libusb/winusb for the job instead.

We can make the g_zero (sink) work with winusb. (In a very boring unresponsive way.) But the loopback config in g_zero seems to be broken?

Here's the output:

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root:/> modprobe g_zero loopdefault=1

zero gadget: Gadget Zero, version: Cinco de Mayo 2008

zero gadget: zero ready

root:/> zero gadget: high speed config #2: loopback

zero gadget: can't loop ep6out to ep5in: -22

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I doubt it's supposed to say "can't loop ... " ? (And it's not sending back any output.)

We're using the 2010R2 uclinux, uboot etc.

Is there a trick or something to make the loopback work?

Does anyone have some good advice in regard to libusb/winusb and uclinux? Despite the whole ease-of-use and near defacto status in micro.c dev. it seems to frighteningly difficult to make it work with uclinux.

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2011-06-14 08:19:40 Re: Error in g_zero? (Gadget usb)

Morten Kvistgaard (DENMARK)

Message: 101254

Edit: It's the 2010R1-RC5 uclinux ofc.

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2011-06-15 10:45:56 Re: Error in g_zero? (Gadget usb)

Morten Kvistgaard (DENMARK)

Message: 101288

Meh, never mind. I've found something better than the g_zero loopback.

The g_serial has a "generic" mode which will remove all the fancy stuff. (Pure transfers back and forth)

You can load it with the following command: