Hi
You can get out-of-the-box makefile based USB-CDC in the uTasker project:
- http://www.utasker.com/docs/uTasker/USB_User_Guide.PDF
- http://www.utasker.com/docs/uTasker/uTaskerV1.3_USB_Demo.PDF
It allows multiple USB-CDC interfaces for communication (including MODBUS) or USB-UART bridging with complete end-to-end flow control (see reference with 6 USB-CDC-UART bridges at http://www.utasker.com/kinetis/TWR-K64F120M.html).
The USB-CDC supports also RNDIS (for virtual Ethernet) and can be combined with MSD, Audio, HID without any effort - see http://www.utasker.com/kinetis/USB_Device.html
Industrially proven in many Coldfire products since 2008, and Kinetis K and KLs from 2011 - including unique USB simulation to simplify/accelerate application level development and testing as well as software auditing.
Not based on PE or KDS examples and requires no tools. Small memory footprint, extensively tested and maintained for professional requirements. One-on-one email/tel. support where required.
Freely available as open-source at http://www.utasker.com/forum/index.php?topic=1721.0 in case no support is desired (some newest features may be missing in anonymous download versions).
Regards
Mark
