add deadband cause it's not packaged (https://github.com/cellularmitosis/Deadband)

Author: thijstriemstra

Deadband/Deadband.cpp

@@ -0,0 +1,84 @@
+/*
+Deadband.cpp - An Arduino library for implementing deadband on digital values.
+https://github.com/cellularmitosis/Deadband
+v0.1 (Sept 7, 2013)
+
+Deadband: see http://en.wikipedia.org/wiki/Deadband%23Backlash
+
+If you've ever used a mill or a lathe which had some slop in the carriage, 
+or an old car which had slop in the steering, that's deadband.
+
+The Deadband library allows you to create "digital slop".
+
+Copyright (c) 2013 Jason Pepas
+
+This software is released under the terms of the MIT License:
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include "Deadband.h"
+
+
+DeadbandFilter* createDeadbandFilter(uint8_t numberOfLSBsToConsume)
+{
+	// thanks to http://stackoverflow.com/a/252810  --jpepas
+	DeadbandFilter *filter = NULL;
+	filter = (DeadbandFilter*)malloc(sizeof(DeadbandFilter));
+ 	if (filter == NULL)
+ 	{
+		return NULL;
+	}
+  
+	filter->numberOfLSBsToConsume = numberOfLSBsToConsume;
+	filter->deadbandWindowLowerEdge = 0;
+	filter->previousOutput = 0;
+  
+	return filter;
+}
+
+
+uint16_t deadband(DeadbandFilter *filter, uint16_t newInput)
+{
+	if (filter == NULL || filter->numberOfLSBsToConsume == 0)
+	{
+		return newInput;
+	}
+
+	uint16_t windowWidth = (1 << filter->numberOfLSBsToConsume) - 1;
+	uint16_t deadbandWindowUpperEdge = filter->deadbandWindowLowerEdge + windowWidth;
+
+	if (newInput > deadbandWindowUpperEdge)
+	{
+		deadbandWindowUpperEdge = newInput;
+		filter->deadbandWindowLowerEdge = deadbandWindowUpperEdge - windowWidth;
+		filter->previousOutput = deadbandWindowUpperEdge;
+		return deadbandWindowUpperEdge;
+	}
+	else if (newInput < filter->deadbandWindowLowerEdge)
+	{
+		filter->deadbandWindowLowerEdge = newInput;
+		filter->previousOutput = newInput;
+		return filter->deadbandWindowLowerEdge;
+	}
+	else
+	{
+		return filter->previousOutput;
+	}
+}

Deadband/Deadband.h

@@ -0,0 +1,54 @@
+/*
+Deadband.h - An Arduino library for implementing deadband on digital values.
+https://github.com/cellularmitosis/Deadband
+v0.1 (Sept 7, 2013)
+
+Deadband: see http://en.wikipedia.org/wiki/Deadband%23Backlash
+
+If you've ever used a mill or a lathe which had some slop in the carriage, 
+or an old car which had slop in the steering, that's deadband.
+
+The Deadband library allows you to create "digital slop".
+
+Copyright (c) 2013 Jason Pepas
+
+This software is released under the terms of the MIT License:
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#ifndef Deadband_h
+#define Deadband_h
+
+#include <stdlib.h>
+#include <stdint.h>
+
+struct _DeadbandFilter
+{
+	uint8_t numberOfLSBsToConsume;
+	uint16_t deadbandWindowLowerEdge;
+	uint16_t previousOutput;
+};
+
+typedef struct _DeadbandFilter DeadbandFilter;
+
+DeadbandFilter* createDeadbandFilter(uint8_t numberOfLSBsToConsume);
+uint16_t deadband(DeadbandFilter *filter, uint16_t newInput);
+
+#endif // Deadband_h