I'm looking for an example source code to make a virtual serial port device driver on Windows & Linux. This will be used for a USB <-> RS232 converter.
I'm making my own low speed USB device and I want user could use it easily via serial port. So, I will try to find the way to make a driver as your recommend.
For me, a USB driver is not so difficult. But making a virtual serial port driver is not easy for me.