Diff: acceleration.h

Revision:

0:26bb60735515

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/acceleration.h	Sun Dec 11 05:38:54 2011 +0000
@@ -0,0 +1,97 @@
+/* Copyright 2011 Adam Green (http://mbed.org/users/AdamGreen/)
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+/* Classes to apply acceleration to input from Sparkfun's Blackberry Trackball
+   Breakout board.
+*/
+#ifndef _ACCELERATION_H_
+#define _ACCELERATION_H_
+
+#include <mbed.h>
+#include <limits.h>
+#include "BBTrackball.h"
+
+
+
+/* Class which can apply acceleration to each of the roller inputs from the
+   Sparkfun Blackberry Trackball device.
+*/
+template<size_t SampleCount,
+         int    DecelerateThreshold,
+         int    AccelerateThreshold,
+         int    MaxAcceleration>
+class CAcceleratedRoller
+{
+public:
+    CAcceleratedRoller(void)
+    {
+        m_Acceleration = 1;
+        m_VelocitySum = 0;
+        m_SampleIndex = 0;
+        memset(m_Samples, 0, sizeof(m_Samples));
+    }
+
+    void AccumulateSample(short CurrVelocity);
+    int  Acceleration(void) const
+    {
+        return m_Acceleration;
+    }
+    
+protected:
+    unsigned char   ClampToUChar(short Value);
+    int             m_Acceleration;
+    int             m_VelocitySum;
+    size_t          m_SampleIndex;
+    unsigned char   m_Samples[SampleCount];
+};
+
+
+class CAcceleratedTrackball : public CBBTrackball
+{
+public:
+    CAcceleratedTrackball(PinName BluePin,
+                          PinName RedPin,
+                          PinName GreenPin,
+                          PinName WhitePin,
+                          PinName UpPin,
+                          PinName DownPin,
+                          PinName LeftPin,
+                          PinName RightPin,
+                          PinName ButtonPin) : CBBTrackball(BluePin,
+                                                            RedPin,
+                                                            GreenPin,
+                                                            WhitePin,
+                                                            UpPin,
+                                                            DownPin,
+                                                            LeftPin,
+                                                            RightPin,
+                                                            ButtonPin),
+                                               m_IterationsSinceLastMotion(INT_MAX)
+    {
+    }                                                            
+    void GetState(int& DeltaX, int& DeltaY, int& ButtonPressed);
+
+protected:
+    void    UpdateLEDColourBasedOnMotion(int VelocityX, 
+                                         int VelocityY, 
+                                         int ButtonPressed);
+    
+    int                                 m_IterationsSinceLastMotion;
+    CAcceleratedRoller<250, 4, 4, 40>   m_UpAcceleration;
+    CAcceleratedRoller<250, 4, 4, 40>   m_DownAcceleration;
+    CAcceleratedRoller<250, 4, 4, 30>   m_LeftAcceleration;
+    CAcceleratedRoller<250, 4, 4, 30>   m_RightAcceleration;
+};
+
+#endif // _ACCELERATION_H_