Method acquireBuffer

src/fl/channels/spi/device.cpp.hpp:259–284

// }

DMABuffer Device::acquireBuffer(size_t size) {
    if (!isReady()) {
        return DMABuffer(SPIError::NOT_INITIALIZED);
    }

    // Get hardware controller
    if (!pImpl->hw_backend) {
        FL_WARN("SPI Device: No hardware controller available");
        return DMABuffer(SPIError::NOT_INITIALIZED);
    }

    // Use polymorphic interface (works for SpiHw1/2/4/8)
    SpiHwBase* hw = pImpl->hw_backend.get();

    // Always acquire a fresh buffer from hardware
    // Note: The hardware controller may internally cache/reuse buffers
    DMABuffer buffer = hw->acquireDMABuffer(size);

    if (!buffer.ok()) {
        FL_WARN("SPI Device: Failed to acquire DMA buffer from hardware");
    } else {
        FL_LOG_SPI("SPI Device: Acquired DMA buffer (" << size << " bytes)");
    }

    return buffer;
}

fl::optional<fl::task::Error> Device::transmit(DMABuffer& buffer, bool async) {
    if (!isReady()) {