Diff: filters.h

Revision:

0:0a76ae27065b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/filters.h	Wed May 05 12:10:15 2010 +0000
@@ -0,0 +1,62 @@
+/*
+mbed touchpad & accelerometer experiments.
+
+CPV, 14/09/2009
+*/
+
+
+#ifndef __FILTERS_H__
+#define __FILTERS_H__
+
+#define FILTER_MAX_SIZE  16
+
+class FilterBoxF
+{
+public:
+  FilterBoxF(void) { initialise(FILTER_MAX_SIZE); }
+  void initialise(unsigned int size);
+  float tick(float in);
+  float get() { return m_out; }
+  float operator()(void) { return m_out; }
+  
+protected:
+  float m_history[FILTER_MAX_SIZE];
+  unsigned int m_size;
+  unsigned int m_index;
+  float m_out;
+};
+
+
+class FilterBoxI
+{
+public:
+  FilterBoxI(void) { initialise(FILTER_MAX_SIZE); }
+  void initialise(unsigned int size);
+  int tick(int in);
+  int operator()(void) { return m_out; }
+  
+protected:
+  int m_history[FILTER_MAX_SIZE];
+  unsigned int m_size;
+  unsigned int m_index;
+  int m_out;
+};
+
+
+class FilterIirI
+{
+public:
+  FilterIirI(void) { initialise(); }
+  void initialise(int tau=1, int limit=0xffff);
+  int tick(int in);
+  int operator()(void) { return m_out; }
+  
+protected:
+  int m_out;
+  int m_remainder;
+  int m_limit;
+  int m_tau;
+};
+
+
+#endif // __FILTERS_H__