1. Keil5MDK environment (environment is OK).
2. Use SWD debug interface of MSP432P4501R.
3. The Emulator: Wild Fire-Debugger, ARM's CMSIS-DAP standard, supports M3, M4 core monolithic.
4. The board is drawn by customer himself. The core was not read at first, and the customer suspects it is a SWD data port issue, and then pulled the 10K resistor up but still could not read the core.
The MSP432P401R core cannot be read under the Keil5 MDK, the emulator is okay, and it can read the other ARM monolithic cores.