Getting logging output with nRF5340 DK

When connected to a computer, the nRF5340 DK emulates virtual COM ports. The number of COM ports depends on the DK version you are using.

nRF5340 DK v2.0.0 COM ports

When connected to a computer, the nRF5340 DK v2.0.0 emulates two virtual COM ports. In the default configuration, they are set up as follows:

• The first COM port outputs the log from the network core (if available).

• The second COM port outputs the log from the application core.

nRF5340 DK v1.0.0 COM ports

When connected to a computer, the nRF5340 DK v1.0.0 emulates three virtual COM ports. In the default configuration, they are set up as follows:

• The first COM port outputs the log from the network core (if available).

• The second (middle) COM port is routed to the P24 connector of the nRF5340 DK.

• The third (last) COM port outputs the log from the application core.

To use the middle COM port in the nRF5340 DK v1.0.0, complete the following steps:

1. Map RX, TX, CTS and RTS pins to four different pins on the development kit, using, for example, devicetree overlays. See the following example, using the nordic,nrf-uarte bindings.

   &pinctrl {
      uart0_default_alt: uart0_default_alt {
         group1 {
            psels = <NRF_PSEL(UART_TX, 0, 20)>,
                    <NRF_PSEL(UART_RX, 0, 21)>,
                    <NRF_PSEL(UART_RTS, 0, 18)>,
                    <NRF_PSEL(UART_CTS, 0, 16)>;
         };
      };
   
      uart0_sleep_alt: uart0_sleep_alt {
         group1 {
            psels = <NRF_PSEL(UART_TX, 0, 20)>,
                    <NRF_PSEL(UART_RX, 0, 21)>,
                    <NRF_PSEL(UART_RTS, 0, 18)>,
                    <NRF_PSEL(UART_CTS, 0, 16)>;
            low-power-enable;
         };
      };
   };
   
   &uart0 {
      status = "okay";
      compatible = "nordic,nrf-uarte";
      current-speed = <115200>;
      pinctrl-0 = <&uart0_default_alt>;
      pinctrl-1 = <&uart0_sleep_alt>;
      pinctrl-names = "default", "sleep";
   };
   

2. Wire the previously mapped pins to TxD, RxD, CTS, and RTS on the P24 connector.