ardupilot/libraries/AP_HAL_PX4/AP_HAL_PX4_Namespace.h

#pragma once

namespace PX4 {
	class PX4Scheduler;
	class PX4UARTDriver;
	class PX4Storage;
	class PX4RCInput;
	class PX4RCOutput;
	class PX4AnalogIn;
	class PX4AnalogSource;
	class PX4Util;
        class PX4GPIO;
        class PX4DigitalSource;
        class NSHShellStream;
        class PX4I2CDriver;
        class PX4_I2C;
        class Semaphore;
}