51802，16MHz only, run a program ,first a few hours is OK ,but later it carshed. how can I do for debug.
Hi,
The first step is to start debugging the issue. How did it "crash"? What state is the device in at that point? What happened just before the crash (logging, error codes, stack trace etc. might give tell you something about what happened.
more detail,,SDK9.0 ,,BLE_UART,,
