controllib split blocks into separate files

src/lib/controllib/BlockDerivative.hpp

@@ -0,0 +1,100 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file blocks.h
+ *
+ * Controller library code
+ */
+
+#pragma once
+
+#include "BlockLowPass.hpp"
+
+#include <px4_defines.h>
+#include <math.h>
+
+#include "block/Block.hpp"
+#include "block/BlockParam.hpp"
+
+#include "matrix/math.hpp"
+
+namespace control
+{
+
+/**
+ * A simple derivative approximation.
+ * This uses the previous and current input.
+ * This has a built in low pass filter.
+ * @see LowPass
+ */
+class __EXPORT BlockDerivative : public SuperBlock
+{
+public:
+// methods
+	BlockDerivative(SuperBlock *parent, const char *name) :
+		SuperBlock(parent, name),
+		_u(0),
+		_initialized(false),
+		_lowPass(this, "LP")
+	{};
+	virtual ~BlockDerivative() {};
+
+	/**
+	 * Update the state and get current derivative
+	 *
+	 * This call updates the state and gets the current
+	 * derivative. As the derivative is only valid
+	 * on the second call to update, it will return
+	 * no change (0) on the first. To get a closer
+	 * estimate of the derivative on the first call,
+	 * call setU() one time step before using the
+	 * return value of update().
+	 *
+	 * @param input the variable to calculate the derivative of
+	 * @return the current derivative
+	 */
+	float update(float input);
+// accessors
+	void setU(float u) {_u = u;}
+	float getU() {return _u;}
+	float getLP() {return _lowPass.getFCut();}
+	float getO() { return _lowPass.getState(); }
+protected:
+// attributes
+	float _u; /**< previous input */
+	bool _initialized;
+	BlockLowPass _lowPass; /**< low pass filter */
+};
+
+} // namespace control