public static extern int wiringPiSPISetupMode(SPIChannels channel, int speed, int mode);
public static extern int WiringPiSPIDataRW(SPIChannels channel, byte[] data, int len);
public static extern int WiringPiSPISetup(SPIChannels channel, int speed);
public static extern int WiringPiSPIGetFd(SPIChannels channel);