msp432 bsl debug 出现 low power mode 导致不能够进入断点，但是也没有找到设置电源模式的地方
CORTEX_M4_0: GEL Output: Memory Map Initialization Complete
CORTEX_M4_0: GEL Output: Halting Watchdog Timer
CORTEX_M4_0: WARNING : On MSP432P401R hitting a breakpoint cannot be detected by the debugger when the device is in low power mode.
