Method show

tests/fl/channels/spi_channel.cpp:205–211

    }

    void show() override {
        if (!mEnqueuedChannels.empty()) {
            mTransmittingChannels = fl::move(mEnqueuedChannels);
            mEnqueuedChannels.clear();
            beginTransmission(mTransmittingChannels);
        }
    }

    DriverState poll() override {
        if (!mTransmittingChannels.empty()) {