Using the iPad Camera Connector Kit for a True USB to DAC signal on iPhone

As many people have discovered the iPad camera connector kit (specifically the USB one) has a couple of surprises. The first being that it opens the entire USB host stack wide open on the platform. This allows things like keyboards, microphones and other interesting things not normally supported on the device to suddenly work. The most important one I'm talking about now is the audio stack. The connector allows for a USB DAC to be directly connected into the iPad without the need of an analog conversion. Portable amps with a DAC just got a lot more appealing.  Unfortunatly this doesn't translate to the iPhone. Under normal conditions the iPhone will error out and say the device is unsupported. I've been searching Cydia (my phone is jailbroken) trying to find software stacks which would allow me the ability to use the connector. I've so far had the best luck with a program called resupported4. Unfortunatly I don't have audio out, however the iphone reacts in the same way it would if I were to connect it to a LOD (the volume control disappears). I'll continue working on this and tweaking it (I may need to simply port the ipad USB Host stack to the iphone) but hopefully I will be successful and it will allow other iphone audiophiles out there to enjoy the benefits.

If anyone knows of a way or has experience in this field drop me a line or reply to this thread. Lets see if we can get this to work.

Yes this works 100% for the iPad, I tested it on my LittleDot DAC. The resupported4 prevents the device support negotiation from preventing the CCK from auto unmounting. I think what needs to be done is either reverse engineer the USB Host stack from the ios 3.2 that the iPad uses or figure out if there is someone who has basically already done it. Yes btw resupported4 is mostly for video out, but they also do audio out in the form of VGA. Not great, but it's a start.

Well after some more research I was able to get a rudamentary signal by literally lifting the entire ipad USB host stack and hard coding it into my phone. Unfortunatly it's highly unstable and on top of that it pretty much makes my phone unusable....I tried to unplug the thing phone crrashes, make a call, phone crashes, pause music, phone crashes....but it played audio for a few seconds. Now after a restore my phone is happier I'm going to do some code analysis and see what I can find. I've been trying to find some people who are doing this in the jailbreaking community but I think they are being mum about it for now which is cool. I'll post more when I know more.