Cannot receive UART on ble_app_uart with nRF52382

[Akinobu Yokawa]

I am running the ble_app_uart example in SDK 13.0 with nRF52382.

• First issue

The app can receive data via UART only when I use "Termite" as a terminal emulator. If I use "TeraTerm", "Putty" and "RealTerm" to send data, it seems that APP_UART_DATA_READY event is not occured in uart_error_handle().

• Second issue

I configured the app to use even parity as follows.

static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        .rx_pin_no    = RX_PIN_NUMBER,
        .tx_pin_no    = TX_PIN_NUMBER,
        .rts_pin_no   = RTS_PIN_NUMBER,
        .cts_pin_no   = CTS_PIN_NUMBER,
        .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
        //.use_parity   = false,
        .use_parity   = true,
        .baud_rate    = UART_BAUDRATE_BAUDRATE_Baud115200
    }; 

The terminal emulator setting was changed to even parity. Then, I tried to send data via UART from it, the app was rebooted. Even if I used "Termite" as a terminal emulator, it happened.

I would appreciate if you could give me any advice.

[Jørgen Holmefjord]

Have you tried debugging, to check for any error codes from your function calls?

[Akinobu Yokawa]

In the case of second issue, the event APP_UART_COMMUNICATION_ERROR was occurred in uart_error_handle(). nrf_drv_uart.c detected NRF_UARTE_EVENT_ERROR in uarte_irq_handler.

[Akinobu Yokawa]

In the case of first issue, I have found the cause. I did not put LF at the end of sending data from terminal emulator other than "Termite". So the event APP_UART_DATA_READY occurred, but data was not relayed via BLE.

[Jørgen Holmefjord]

Please check the error source in app_uart_evt_t.data.error_communication when receiving APP_UART_COMMUNICATION_ERROR event, and compare this to the explanation of the ERRORSRC register.

[Akinobu Yokawa]

Thanks. I have checked it. The value of app_uart_evt_t.data.error_communication is 0x2 (parity error). Does nRF52832 support even parity for UART?