microbit v2 zephyr edge connector and DTS use

[bluetooth_mdw]

Hi

I want to develop something simple for BBC microbit V2 using Zephyr, which can switch on or off an external LED connected to pin 0 on the edge connector. I was able to do this using an old version of Zephyr (v1.14) but I'm now trying to work with v3.3.0 and it looks like a lot has changed, not least with the DTS.

The main dts for the bbc_microbit_v2 board includes this definition:

    edge_connector: connector {

        compatible = "microbit,edge-connector";

        #gpio-cells = <2>;

        gpio-map-mask = <0xffffffff 0xffffffc0>;

        gpio-map-pass-thru = <0 0x3f>;

        gpio-map = <0 0 &gpio0 2 0>,    /* P0 */

               <1 0 &gpio0 3 0>,    /* P1 */

               <2 0 &gpio0 4 0>,    /* P2 */

               <3 0 &gpio0 31 0>,   /* P3 */

               <4 0 &gpio0 28 0>,   /* P4 */

               <5 0 &gpio0 14 0>,   /* P5 */

               <6 0 &gpio1 5 0>,    /* P6 */

               <7 0 &gpio0 11 0>,   /* P7 */

               <8 0 &gpio0 10 0>,   /* P8 */

               <9 0 &gpio0 9 0>,    /* P9 */

               <10 0 &gpio0 30 0>,  /* P10 */

               <11 0 &gpio0 23 0>,  /* P11 */

               <12 0 &gpio0 12 0>,  /* P12 */

               <13 0 &gpio0 17 0>,  /* P13 */

               <14 0 &gpio0 1 0>,   /* P14 */

               <15 0 &gpio0 13 0>,  /* P15 */

               <16 0 &gpio1 2 0>,   /* P16 */

               <19 0 &gpio0 26 0>,  /* P19 */

               <20 0 &gpio1 0 0>;   /* P20 */

    };

What's the recommended way to set up and use GPIO with a specific edge connector pin (e.g. pin 2) from C using Zephyr 3.3.0? A sample app that demonstrates this would be very gratefully received.

Thanks

[bluetooth_mdw]

Hello Nordic support, can you help with this please?

[bluetooth_mdw]

Nordic, you can close this ticket. I found a solution by looking at the line follower sample, which uses the edge-connector.

bbc_microbit_v2.overlay

/ {

    zephyr,user {

        led-gpios = <&edge_connector 2 GPIO_ACTIVE_HIGH>;

    };

};

edge-connector.yaml

compatible: "edge-connector"

main.c

static const struct gpio_dt_spec p2_gpio =

    GPIO_DT_SPEC_GET(DT_PATH(zephyr_user), led_gpios);

void main(void)

{

    if (!device_is_ready(p2_gpio.port)) {

        printk("GPIO controller not ready.\n");

        return;

    }

    printk("Success! Pin 2 at your service!");

}