I have a project I’m struggling with. I must create a device that starts and manipulates audio through buttons connected to jumper wires on an Orange.pi board, but programming them has been a big challenge for me as I have no experience in this.
So far I’ve created a circuit for the buttons with help from the internet, as well as making a gpio_keys file and a DTS file called “button-overlay”.
But when I test the buttons using the evtest command in the terminal, nothing happens.

I will describe how my “gpio_keys” and “button overlay” file is.
Gpio:

/dts-v1/;
/plugin/;
/{
   compatible = "allwinner, sun8i-h3";
   fragment {
       target = <&pio>;
       _overlay_ {
           gpio_keys_user: gpio_keys_user {
               compatible = "gpio-keys";
               pinctrl-names = "default";
               pinctrl-0 = <&pio_button_0>;

               play_pause {
                   label = "Play/Pause";
                   linux, code = <164>; /*KEY_PLAYPAUSE*/
                   gpios = <&pio 0 7 0>; /* PA7 */
               };
               next {
                   label = "Next";
                   linux, code = <163>; */KEY_NEXTSONG*/
                   gpios = < &pio 0 8 0>; /* PA8 */
               };

               previous {
                   label = "Previous";
                   linux, code = <165>; /*KEY_PREVIOUSSONG*/
                   gpios = <&pio 0 9 0>; /*, PA9 */
               };
           };
       };
    };
};

Button overlay:

/dts-v1/;
/plugin/;

/{
    compatible = "brcm, bcm2835", "brcm, bcm 2708", "brcm, bcm 2709";
    fragment@0 {
        target = <&pio>;
        _overlay_ {
           button8: my_button8 {
               compatible = "gpio-keys";
               #adress-cells = <1>;
               #size-cells =<0>;
               pinctrl-names = "default";
               pinctrl-0 = <&button8_pin>;
               status = "okay";

               but-pla {
                   label = "button-gpio8"
                   linux, code = <8>;
                   gpios = <&gpio 8 0>;
               };
            );
         };
     };
};

I don’t know if this information is enough, but I can send you anything else you want to note.