I've got an Atmel AVR A90USBxxxx device that I have configured to "talk USB" via CDC. It's designed to take input from a Host computer, running Windows, Linux, or OS X.
I'm under the impression that Linux and OS X will immediately recognize this CDC device, and with a simple .inf a Windows machine can be told my VID/PID should be opened as a CDC device using usbser.sys.
My question is once the OS has opened this USB device as a serial device, how can I programmatically read and write to that port (for each of the 3 OS's listed but most detail is needed for Windows as I'm completely unfamiliar there)
Thanks