I was waiting for MQX 4.2 to enable a composite USB device on a K70 project. It is good to see that the composite device is now supported. But only on the new stack, and the new stack does not include support for the K70 tower. I am wondering about making a port myself, to support my custom hardware design based on the K70. I am wondering if this is a practical undertaking.
At a glance at the datasheets, the USB controllers for the supported K64 appear very close or identical to that on the K70. The notable exception being that the K70 does not have the IRC48M capability. That is not an important difference as we already have the hardware and configuration necessary to generate the 48 MHz clock. Is there a reason why it should be difficult to make such a port for K70 to the new USB stack in 4.2 ?