Hi 123gmax
If you don't connect your FRDM-KW36 board to the other board, whether you have the debug issues or not? You can run the SDK code for the FRDM-KW36 directly in the MCUXpresso IDE, any debug issues, or just your own code and connect with the external boards?
What's the onboard debugger you are using now? CMSIS DAP or the JLINK?
When you connect the FRDM-KW36 to the other board, whether the two boards are using the same power supply, do you connect the GND together or not?
Please help to check the above points at first.
Wish it helps you!
If you still have questions about it, please kindly let me know!
Best Regards,
Kerry
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