selectControllerForClockPin()

int fl::SpiChannelEngineAdapter::selectControllerForClockPin ( int clockPin, Esp32SpiBus requestedBus )

private

Select best controller for a given clock pin.

Parameters

clockPin

Clock pin number to route

Returns

Controller index, or -1 if none available

Definition at line 99 of file spi_channel_adapter.cpp.hpp.

                                                                                                            {
    // Check if clock pin already assigned
    for (const auto& assignment : mClockPinAssignments) {
        if (assignment.clockPin == clockPin && assignment.requestedBus == requestedBus) {
            return assignment.controllerIndex;
        }
    }
 
    // Find highest priority available controller
    int bestIndex = -1;
    int bestPriority = -1;
 
    for (size_t i = 0; i < mControllers.size(); i++) {
        if (requestedBus != Esp32SpiBus::AUTO &&
            mControllers[i].controller->getBusId() != static_cast<int>(requestedBus)) {
            continue;
        }
        if (!canControllerHandleClockPin(mControllers[i], clockPin)) {
            continue;
        }
 
        if (mControllers[i].priority > bestPriority) {
            bestIndex = i;
            bestPriority = mControllers[i].priority;
        }
    }
 
    // Record assignment
    if (bestIndex >= 0) {
        mClockPinAssignments.push_back({clockPin, requestedBus, static_cast<size_t>(bestIndex)});
    }
 
    return bestIndex;
}

References fl::AUTO, canControllerHandleClockPin(), controller, fl::FL_NO_EXCEPT, mClockPinAssignments, and mControllers.

Referenced by transmitBatch().

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