On Thu, Dec 11, 2014 at 10:09:00AM +0800, ivo welch wrote: > dear experts---I would like to learn how to write programs that > communicate over USB. both the host (desktop linux) and the client > (beaglebone black) are running linux. I can program both host and > gadget. ultimately, I will want to treat one USB port as a dedicated > link between the two, without other protocols or hubs allowed. (there > is reason but no method [yet] to my madness.) You can do this today with a simple userspace program on both sides of the connection. But that's not how USB usually works, read the specs at usb.org for the details of how different device protocols work. > for newbies like me, it would be useful to have links to good > up-to-date documentation that tells us/me at least the basic > structures. And I need simple starter skeleton C programs that are > recommended, current, and functional, that I can extend. I have seen > some here and there, usually either very involved or higher level. That's all userspace, which we don't care about :) Seriously, the information is out there, linux-usb.org is about the kernel code, all of which should be very well documented in the kernel itself, as there is lots of documentation there if you want to write a kernel driver. > * I need a basic usb_bulk_msg() sender example with working basic > "echo" responder at first. I need a pony :) Best of luck, greg k-h -- 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
