feel
warm.
connect.

/* OMPHONE FIRMWARE v4.0 — nRF52832
   Pickup-to-pulse · 2 buttons · BLE proximity     */

#define BEAT_INTERVAL_MEDITATION  7000   // 7s — meditation
#define BEAT_INTERVAL_MIN          800   // fastest — very close
#define LUB_DURATION                70   // first thump ms
#define LUB_DUB_GAP               180   // gap between lub + dub
#define NTC_ADC_THRESHOLD         680   // ~45°C safety cutoff

/* Touch poll — runs every 50ms */
static void touch_poll_handler(void *p) {
    bool raw = nrf_gpio_pin_read(PIN_TOUCH);

    /* Debounce: 200ms pickup, 1500ms putdown */
    if (confirmed_pickup) {
        m_state = DEVICE_WAKING;
        heater_set(HEATER_LOW);    // warmth starts immediately
        motor_pulse(MOTOR_SOFT);   // first heartbeat
    }
    if (confirmed_putdown) {
        m_state = DEVICE_FADING;
        heater_set(HEATER_OFF);    // heat stops instantly
        m_fade_count = 5;           // beat fades over 5 pulses
    }
}

/* Warmth ramps with hold duration */
static uint16_t heat_for_ramp(void) {
    uint32_t held_ms = ms_now() - m_held_since_ms;
    if (held_ms < 5000)  return HEATER_LOW;   // 0–5s
    if (held_ms < 15000) return HEATER_MED;   // 5–15s
    return HEATER_HIGH;                         // 15s+
}