Can you give a more specific ETA on when the full integration of MQX with KDS will be complete? As I showed in my last reply in a previous post KDS 1.1.0 adding MQX component using processor expert fails build, the current status is that MQX is incompatible with Processor Expert, at least as far as I can tell. I'm about to start a major development and would rather wait for the fully integrated package if it's imminent.
The latest MQX release v4.1.1 has support for Kinetis Design Studio (KDS) toolchain. But your issue is specific to the MQX for KSDK release. The current v1.0.0 Beta release for this available, see Beta version of MQX RTOS for Kinetis SDK - Now Available. This does have current support for Processor Expert, both with KDS or using the stand-alone Processor Expert Driver Suite for other toolchains. See the tutorial for using MQX for KSDK with Processor Expert. The production release for MQX for KSDK v1.1.0 is planned for Decemeber, like David said.
