thank you, greg. if linux-usb is the wrong starter, can you recommend some pointers to good starter documentation and books about writing user-space USB programs? (is it really "read the linux kernel source"??) ---- Ivo Welch (ivo.welch@xxxxxxxxx) http://www.ivo-welch.info/ J. Fred Weston Professor of Finance Anderson School at UCLA, C519 Director, UCLA Anderson Fink Center for Finance and Investments Free Finance Textbook, http://book.ivo-welch.info/ Editor, Critical Finance Review, http://www.critical-finance-review.org/ On Thu, Dec 11, 2014 at 10:42 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > 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
