Configure P0.05/P0.07 as GPIO when using uart0

[Mike Austin (LPI)]

I've got a custom board using an nRF52832.  I'm using the P0.06/P0.08 as the TX/RX pins for UART comms, but don't need the P0.05/P0.07 pins for CTS/RTS.  Is there anyway I can reconfigure those to be used as GPIO, rather than have them sitting unused?

If it is possible, how do I go about doing it?  I'm running NCSv2.6.1 and have Visual Studio Code as my IDE.

Cheers,

Mike

[SwRa]

Hi Mike,

To use the CTS/RTS pins as normal gpio, you can write an overlay file reconfiguring the pins for uart and removing the CTS/RTS assignments.. Just assign the Tx/RX pins:

&pinctrl {
    uart0_default: uart0_default {
        group1 {
            psels = <NRF_PSEL(UART_TX, 0, 6)>;
        };
        group2 {
            psels = <NRF_PSEL(UART_RX, 0, 8)>;
            bias-pull-up;
        };
    };

    uart0_sleep: uart0_sleep {
        group1 {
            psels = <NRF_PSEL(UART_TX, 0, 6)>,
                    <NRF_PSEL(UART_RX, 0, 8)>;
            low-power-enable;
        };
    };
};

&uart0 {
    pinctrl-0 = <&uart0_default>;
    pinctrl-1 = <&uart0_sleep>;
    pinctrl-names = "default", "sleep";
};

Best Regards,

Swathy