I can't identify correct USB node

Hi guys!
How can I use nodes /dev/usbdevX.X_epXX to open, write and read over USB in C language programming ? How can I recognize valid node ? I need this to connect two SBC ARM9 boards via USB. In desktop linux, it's recognized via cdc_acm driver and it appear as /dev/ttyACM0 and work perfectly!

Erm, not sure if it will help, but have you tried / looked at libusb?

It seems as if the writer(s) of the Linux drivers for the X-Box USB gamepad used this quite successfully to do something similar to what you want to do... you might do well to look at their code as well.

Also, take a look at the MAME project's source for interfacing with the /dev/input/ tree - MAME works 100% with a USB X-Box gamepad.

E. g. my reasoning is that if you take a look at the above, you might at least find a starting point to how they identify which nodes contain the USB X-Box game controller... and how you might be able to identify the nodes you need for your devices.

Oh yeah! Thanks for indicate this library. This information help me. One more time thanks.