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APP_UART_COMMUNICATION_ERROR

Hello,I am using SDk14.1.Sometimes when I send data to nrf52832 via serial port,the code prompted me "APP_UART_COMMUNICATION_ERROR".And the value of the ERRORSRC register is 0.The ERRORSRC register should normally have a non-zero value when a program reports an error,such as NRF_UARTE_ERROR_OVERRUN_MASK (0x01).I don't know what caused this situation. Is there any way to analyze it?

Some sources indicate that the RX of the serial port needs to be pulled up, but I set it to pull up and it will still be there.

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