Method initializeSpi

src/platforms/esp/32/drivers/parlio/parlio_engine.cpp.hpp:1627–1753

}

bool ParlioEngine::initializeSpi(const fl::vector<int>& pins,
                                  u32 spiClockHz,
                                  size_t maxBytesPerChannel) FL_NOEXCEPT {
    // SPI-over-PARLIO requires exactly 2 pins (clock + data)
    if (pins.size() != 2) {
        FL_WARN("PARLIO_SPI: Expected 2 pins (clock, data), got " << pins.size());
        return false;
    }

    // Detect config change: if already initialized with different mode or clock, deinit first
    bool needsReinit = false;
    if (mInitialized) {
        if (mEncodingMode != EncodingMode::SPI || mSpiClockHz != spiClockHz ||
            mDataWidth != 2 || mPins.size() != pins.size() ||
            (mPins.size() >= 2 && (mPins[0] != pins[0] || mPins[1] != pins[1]))) {
            needsReinit = true;
        } else if (mPeripheral && mPeripheral->isInitialized()) {
            // Same config, already initialized - reuse
            return true;
        }
    }

    if (needsReinit && mPeripheral && mPeripheral->isInitialized()) {
        if (mTxUnitEnabled) {
            mPeripheral->disable();
        }
        mPeripheral->deinitialize();
        mInitialized = false;
        mTxUnitEnabled = false;
    }

    // Set SPI-specific state before calling base initialize path
    mEncodingMode = EncodingMode::SPI;
    mSpiClockHz = spiClockHz;

    // Convert max bytes to max LEDs for buffer sizing (3 bytes per "LED")
    size_t maxLedsEquivalent = (maxBytesPerChannel + 2) / 3;
    if (maxLedsEquivalent == 0) maxLedsEquivalent = 1;

    // Store data width and pins directly (bypass full initialize which does Wave8 LUT)
    mDataWidth = 2;
    mPins = pins;
    mActualChannels = 2;
    mDummyLanes = 0;

    // Store timing parameters
    mTimingT1Ns = 0;
    mTimingT2Ns = 0;
    mTimingT3Ns = 0;
    mResetUs = 0;  // SPI protocols use explicit start/end frames, no reset

    // Get peripheral
    if (mPeripheral == nullptr) {
        mPeripheral = getParlioPeripheral();
    }

    // Allocate ISR context
    if (!mIsrContext) {