On Wed, May 23, 2012 at 9:51 AM, Pratyush Anand <pratyush.anand@xxxxxx> wrote: > > So, is it necessary to have a different alternate setting for isoc > transfer? Is Set Interface mandatory to start isoc? > > Is it that, there can not be asynchronous isoc transfer? Host sends IN > token. Core receives it, sends 0 packet to host, generates xfernotready to > SW, gadget is not ready to send data now. Host is still sending IN token and > receives 0 byte packet. Gadget becomes ready after an *undefined* time. Now > it does not have track of micro frame number. > I am not sure we should hit this condition ideally. By default the gadget's interface would be parked at AltSetting_0 by the host, which would mean no IN token. And if it's non-zero AltSetting the gadget should be ready to provide data - be it 'real' or 'dummy'. Also, ISOC is not meant to be lossless. So such missed frames should simply appear as distortion in media. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
