We're developing a custom USB device (as opposed to host) around a K50 microcontroller. This is a rebuild of a device that was originally based on another vendor's part, which has been discontinued (with no migration path!).

(Yes, we're ticked, as are a lot of their other customers for that part.) Our device must support multiple (2 or more) instances of the USB CDC device class. We have multiple serial ports. At first read, the 5.0 stack does not seem to support multiple instances of a device class. Am I missing something, or is this actually the case?

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I'm in the stage of evaluation some microprocessors and tools for a new product design and have been playing around with the Kinetis Design Studio (on Linux) and the Processor Expert integrated Kinetis SDK support and the Kinetis SDK standalone on a FRDM K64F board and am almost convinced by the solution. Most of the functionality required for the product is already supported / integrated into Processor Expert but I'm missing USB support. I've been able to get a virtual serial connection over USB up and running by building the static USB library from the SDK manually and linking the library into my KDS project, but the process is a bit cumbersome and still needs a fair amount of work to integrate the USB stack properly into the SDK and FreeRTOS. Since more than a month has passed since the beta release of the KDS and more than three month since the beta release of the KSDK presumably a lot of the work that I will have to do was already done by someone else. I was wondering if there are any plans for a second beta release or a RC before the official release 'late summer 2014' that could safe me from doing the integration by myself.

Hello Neil, the status is that with the Kinetis SDK V1.0.0, there is the USB stack (for the SDK) included with it, supporting the K64F. So if your final processor is the KL25/KL26, then I suggest that you use the FRDM boards for it, and not the K64F. For sure the clocks are different, and they are critical for proper USB operation. Benq Scanner 5000 Bl Driver Windows 7 64 Bit here. The later RevE board of the KL25Z board has the ability to provide power to the USB port, but this is not a 'protected' power supply. See USB MSD Host for the FRDM-K20D50M Board MCU on Eclipse It is good for bench experiments, but not for a real host device.

If you have an older FRDM board, you can patch the board to operate in host mode (I did that in this in the post below to use it with a memory stick). USB MSD Host for the Freedom Board MCU on Eclipse The USB mini is standard. To use the port e.g. With a memory stick you need one of the converter dongles or cables available on the market. I have used these in my post above. I hope this helps, Erich. We have sample code for Serial over USB and MSD class using MQX 3.4 USB device stack.