Date: Wed, 7 Jan 2004 07:05:38 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: Jay Cornwall <jay@evilrealms.net> Subject: Re: USB stack / configuration 0 Message-ID: <20040107060538.GE45569@cicely12.cicely.de> In-Reply-To: <200401071605.15740.doconnor@gsoft.com.au> References: <3FFA04A8.30601@evilrealms.net> <20040106081714.GH39786@cicely12.cicely.de> <200401071605.15740.doconnor@gsoft.com.au>
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On Wed, Jan 07, 2004 at 04:05:15PM +1030, Daniel O'Connor wrote: > On Tuesday 06 January 2004 18:47, Bernd Walter wrote: > > > When setting a USB device to configuration number USB_UNCONFIG_NO (i.e. > > > 0), the device goes into an unconfigured state with an invalid > > > dev->cdesc. How does one then leave this unconfigured state and > > > reconfigure the device to accept configuration changes? (all > > > USB_SET_CONFIG changes are currently refused after going into > > > configuration 0 - I'm not sure if this is the desired behaviour or a bug) > > > > I have to read the docs first bevor making a qualified comment about > > this. > > I'm not 100% sure if this applies, but.. > There are certainly situations where you want to reenumerate the USB devices, > for example there are a number of devices which have no real firmware - they > expect to be programmed by the PC then reset and reenumerated after being > plugged in. Different story. > I have such a device (M-Audio Mobile Pre USB) and I have modified USB audio > code which works except that you need to manually reset the device without > removing power (which is done by partially removing and then reinserting the > USB connector). Bad device - it would have been so easy add an single transitor to do this automaticaly. Nevertheless USB_UNCONFIG_NO can't help you here. What you need to do is toggling the hub port if the device is to stupid to detach/reattach on his own. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de
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