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thanks for reply, yes I monitor power supply It's ok and stable

for power supply I use LDO option , and I don't place inductor 15uH to use DC-DC convertor , should I set any config for LDO or not ?

I doubt about RTSN and CTS pins, I pulldown RTSN pin and CTS pin is float

I send opcode and length and parameter with HAL_UART_Transmit() function

which IOs should I monitor value ?