Linux USB Device Drivers and Linux USB Device Side user space application

Background of Problem:
We need to make a USB communication to transfer some data, on the Host side we have a Linux or Windows PC, on device side we have a target board running LINUX on it.

Problem:
1) I need to know whether there are user space APIs available to send data to host?
2) If you have any sample code, transferring only characters, can you please send it across?
3) If you have any idea as to how can we implement the solution to question 1 ?


Thanks
Ashwin Deshpande

Can you plug USB-serial in at each end and run kermit?

We dont have such facility to plug any external hardware into our system....

What we need is analogous library as we have 'libusb' on host side.... if not such library does Linux have its own APIs?

Beaglebone black Angstrom configures network over USB and as a result from either a Windows or Linux host you can attach to the BBB having plugged into it solely via USB cabling and then you're talking to it via the network where you can ssh, scp, or use the webserver.

You'd have to search the Angstrom distro to see how they accomplish this. But my thinking is that your Linux target would need to supply the logical capabilities and then the other PC merely uses the communications mechanism; be that serial or network.

There's also nothing wrong with smallpond's suggestion.

Be aware that your original question basically asks, "Gimme code!" ... Well, people aren't here to just hand you code per your requests. It gives me the impression that you have a board where you're "supposed" to accomplish this because it's an assignment, so you're asking the web to solve that for you.

Further, this next comment is confusing and makes me wonder what's the point here?

Originally Posted by ashwindeshpande We dont have such facility to plug any external hardware into our system....

I see that and I say, "Well ... don't bother since you can't plug in anything anyways!"