/ {
  aliases {
    /* alias used by DT_ALIAS(led0) in app code */
    led0 = &ld2;
  };

  /* simple gpio-leds node */
  leds {
    compatible = "gpio-leds";
    ld2: led_0 {
      gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>; // LD2 -> PA5
      label = "LD2";
    };
  };
};

&gpioa {
  status = "okay";
};

&gpioc {
  status = "okay";
};

/* ── Audio ADC ─────────────────────────────────────────
 *
 * ADC1 is already enabled by the board DTS with:
 *   - pinctrl on PA0 (ADC1_IN1) — Arduino header A0
 *   - SYNC clock, prescaler /4 → 42.5 MHz ADC clock
 *
 * We just add the channel config here.
 *
 * Conversion time = (641 + 12.5) / 42.5 MHz = 15.4 µs
 * Max sample rate ≈ 65 kHz — plenty for 44.1 kHz
 * Actual 44.1 kHz rate is set by a timer in code.
 */
&adc1 {
  #address-cells = <1>;
  #size-cells = <0>;

  channel@1 {
    reg = <1>; // IN1 = PA0
    zephyr,gain = "ADC_GAIN_1";
    zephyr,reference = "ADC_REF_INTERNAL";
    zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_TICKS, 641)>;
    zephyr,resolution = <12>;
  };
};

/* ── TIM6 — ADC sample clock ─────────────────────────
 *
 * Basic timer, no PWM/capture — just counting.
 * TRGO output triggers ADC1 conversions.
 *
 * Timer clock = 170 MHz (APB1, no prescaler)
 * ARR = (170,000,000 / 44,100) - 1 = 3854
 * Actual rate = 170,000,000 / 3855 = ~44,099 Hz
 *
 * Trigger routing (TIM6_TRGO → ADC1) is done in code
 * via STM32 LL/HAL — devicetree just enables the clock.
 */
&timers6 {
  status = "okay";
  st,prescaler = <0>;

  counter {
    status = "okay";
  };
};