Hi Dawei,
DO you mean the DAP source code is the oepnsdav2 MBED source code?
That code is for the K20 chip, and used as the debugger, just like the FRDM on board debugger with MK20DX128VFM5, when you use the opensda v2.0, and change the firmware to JLINK, then the Jlink firmware will support the KEA128 chip.
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Kerry
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