How to configure the Second UART port in the nRF52840 DK?

Teja_K 5 days ago

Hello,

Currently, I am working on the nRF 52840 DK and the UART port named uart0 is connected to the on board debugger, Where do i find the pins for the UART1 ? I could not able to figure it out. Please let me know how can we do this?

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0 SwRa 6 hours ago

Hi Teja,

Teja_K said:
nrf52840dk_nrf52840.overlay:14 (column 14): parse error: expected node or property name

The error you're seeing suggests that there's a syntax issue in your overlay file.

For enabling RTS and CTS, you can choose any pins that are free and not being used for any other functions.. Here's a simple overlay file that you can refer:

&pinctrl {
    uart1_default: uart1_default {
        group1 {
            psels = <NRF_PSEL(UART_TX, 1, 2)>,
                    <NRF_PSEL(UART_RX, 1, 1)>,
                    <NRF_PSEL(UART_RTS, 0, 14)>,
                    <NRF_PSEL(UART_CTS, 0, 15)>;
        };
    };

    uart1_sleep: uart1_sleep {
        group1 {
            psels = <NRF_PSEL(UART_TX, 1, 2)>,
                    <NRF_PSEL(UART_RX, 1, 1)>,
                    <NRF_PSEL(UART_RTS, 0, 14)>,
                    <NRF_PSEL(UART_CTS, 0, 15)>;
            low-power-enable;
        };
    };
};

&uart1 {
    compatible = "nordic,nrf-uarte";
    status = "okay";
    current-speed = <115200>;
    pinctrl-0 = <&uart1_default>;
    pinctrl-1 = <&uart1_sleep>;
    pinctrl-names = "default", "sleep";
    hw-flow-control;
};

Remember, when using an overlay, you don't need to redefine the entire Uart1 node. You can simply modify the existing one as shown above. For more details on configuring uart and pincntrl in devicetree, you can refer: https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/boards/nordic/nrf52840dk/doc/index.html#changing_uart1_pins

Best Regards,

Swathy

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