Problems using the nRF5340's P0.21 pin as a GPIO output

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

Øivind — Wed, 07 Jun 2023 09:25:17 GMT

Hi,

I can't see anything wrong with the DTS setup, so this looks like a bug.

But for a custom board I would normally recommend having custom board files anyway, where you modify the board files, like nrf5340_cpuapp_common-pinctrl.dtsi, to fit the custom board.

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

seongbin — Wed, 07 Jun 2023 07:17:15 GMT

Please check the file I attached.

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

seongbin — Fri, 02 Jun 2023 00:21:40 GMT

devzone.nordicsemi.com/.../3386.zephyr.dts

I have attached the zephyr.dts file.

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

Øivind — Thu, 01 Jun 2023 12:28:18 GMT

Could I please see the build/zephyr/zephyr.dts file? Either attach the file, or copy it into a code block.

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

seongbin — Thu, 01 Jun 2023 00:44:20 GMT

I tried adding the code below to app.overlay and my code but I have the same problem.

in app.overlay :

&pinctrl {

    /delete-node/ uart0_default;
    /delete-node/ uart0_sleep;
    
    uart0_default_alt: uart0_default_alt {
        group1 {
            psels = <NRF_PSEL(UART_TX, 0, 20)>;
        };
        group2 {
            psels = <NRF_PSEL(UART_RX, 0, 19)>;
            bias-pull-up;
        };
    };

    uart0_sleep_alt: uart0_sleep_alt {
        group1 {
            psels = <NRF_PSEL(UART_TX, 0, 20)>,
                <NRF_PSEL(UART_RX, 0, 19)>;

            low-power-enable;
        };
    };
};

&uart0 {
    pinctrl-0 = <&uart0_default_alt>;
    pinctrl-1 = <&uart0_sleep_alt>;
};

in my code :

gpio_pin_configure_dt(&g_p0_21_gpio, GPIO_OUTPUT);
gpio_pin_set_dt(&g_p0_21_gpio, 0 or 1);

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

Øivind — Wed, 31 May 2023 10:31:06 GMT

Could you try adding these two lines to your pinctrl node in the overlay?

&pinctrl {
    /delete-node/ uart0_default;
    /delete-node/ uart0_sleep;
    uart0_default_alt: uart0_default_alt {

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

seongbin — Tue, 30 May 2023 12:24:44 GMT

Hi Øivind,

Thank you for your reply.

I tried adding the code below to app.overlay but I have the same problem.

&pinctrl {

uart0_default_alt: uart0_default_alt {

group1 {

psels = <NRF_PSEL(UART_TX, 0, 20)>;

};

group2 {

psels = <NRF_PSEL(UART_RX, 0, 19)>;

bias-pull-up;

};

uart0_sleep_alt: uart0_sleep_alt {

group1 {

psels = <NRF_PSEL(UART_TX, 0, 20)>,

<NRF_PSEL(UART_RX, 0, 19)>;

low-power-enable;

};

}

&uart0 {
pinctrl-0 = <uart0_default_alt>;
pinctrl-1 = <uart0_sleep_alt>;
};

Regards,
Seongbin

RE: Problems using the nRF5340's P0.21 pin as a GPIO output

Øivind — Tue, 30 May 2023 11:58:40 GMT

Hi,

Could you try replacing the instances of uart0_default and uart0_sleep with some other name?
For example, add _alt to the end.

Remember to replace the names in the uart0 node as well:

&uart0 {
    pinctrl-0 = <uart0_default_alt>;
    pinctrl-1 = <uart0_sleep_alt>;
};