Function isResetPulse

src/platforms/esp/32/drivers/rmt_rx/rmt_rx_channel.cpp.hpp:96–126

* @brief Check if symbol is a reset pulse * @param symbol RMT symbol to check * @param timing Timing thresholds * @param ns_per_tick Cached nanoseconds per tick * @return true if symbol is reset pulse (long low duration) */

 * @return true if symbol is reset pulse (long low duration)
 */
inline bool isResetPulse(RmtSymbol symbol, const ChipsetTiming4Phase &timing,
                         u32 ns_per_tick) {
    // Cast RmtSymbol to rmt_symbol_word_t to access bitfields
    const auto rmt_sym = fl::bit_cast<rmt_symbol_word_t>(symbol);

    // Reset pulse characteristics:
    // - Long low duration (>50us)
    // - Either duration0 or duration1 can be the low period

    // Convert durations to nanoseconds
    u32 duration0_ns = ticksToNs(rmt_sym.duration0, ns_per_tick);
    u32 duration1_ns = ticksToNs(rmt_sym.duration1, ns_per_tick);

    // Check if either duration exceeds reset threshold
    u32 reset_min_ns = timing.reset_min_us * 1000;

    // Reset pulse should have level=0 (low) for the long duration
    // Check duration0 with level0=0, or duration1 with level1=0
    if (rmt_sym.level0 == 0 && duration0_ns >= reset_min_ns) {
        FL_WARN("isResetPulse DETECTED: duration0=" << duration0_ns << "ns (level0=0), reset_min="
               << reset_min_ns << "ns (" << timing.reset_min_us << "us)");
        return true;
    }
    if (rmt_sym.level1 == 0 && duration1_ns >= reset_min_ns) {
        FL_WARN("isResetPulse DETECTED: duration1=" << duration1_ns << "ns (level1=0), reset_min="
               << reset_min_ns << "ns (" << timing.reset_min_us << "us)");
        return true;
    }

    return false;
}

/**
 * @brief Check if symbol is a gap pulse (transmission gap like PARLIO DMA gap)