RGB_Indicator/hostExtension.overlay at main · LooUQ/RGB_Indicator · GitHub

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/*
 * At 4 MHz, 1 bit is 250 ns, so 3 bits is 750 ns.
 * That's cutting it a bit close to the edge of the timing parameters,
 * but it seems to work on AdaFruit LED rings.
 */
#define SPI_FREQ    4000000
#define ZERO_FRAME  (0x40)                      // binary 0100 0000
#define ONE_FRAME   (0x70)                      // b: 0111 0000


#include <zephyr/dt-bindings/led/led.h>         // get Zephyr's header, using their driver


&spi3 {
    compatible = "nordic,nrf-spim";
    led_strip: ws2812@0 {
        compatible = "worldsemi,ws2812-spi";
        label = "WS2812";

        /* SPI */
        reg = <0>;
        spi-max-frequency = <SPI_FREQ>;

        /* WS2812 */
        chain-length = <1>;
        reset-delay = <100>;
        color-mapping = <LED_COLOR_ID_GREEN
                         LED_COLOR_ID_RED
                         LED_COLOR_ID_BLUE>;
        spi-zero-frame = <0x40>;
        spi-one-frame = <0x70>;
    };
};

&pinctrl {
    spi3_default: spi3_default {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 29)>,
                    <NRF_PSEL(SPIM_MOSI, 0, 26)>,
                    <NRF_PSEL(SPIM_MISO, 0, 30)>;
        };
    };

    spi3_sleep: spi3_sleep {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 29)>,
                    <NRF_PSEL(SPIM_MOSI, 0, 26)>,
                    <NRF_PSEL(SPIM_MISO, 0, 30)>;
            low-power-enable;
        };
    };
};


/ {
    leds {
        compatible = "gpio-leds";

        led0: led_0 {
            gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
        };
    };


    aliases {
        rgb-led = &led_strip;
        level-test = &led0;
    };
};