Furkan Cinar / PM2_Libary

Workshop 2

Dependencies:   FastPWM

LowpassFilter.h@0:86129f1b4a93, 2021-03-30 (annotated)

Committer:
pmic
Date:
Tue Mar 30 12:21:00 2021 +0000
Revision:
0:86129f1b4a93
Child:
4:9c003c402033
First commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pmic 0:86129f1b4a93 1 /*
pmic 0:86129f1b4a93 2 * LowpassFilter.h
pmic 0:86129f1b4a93 3 * Copyright (c) 2018, ZHAW
pmic 0:86129f1b4a93 4 * All rights reserved.
pmic 0:86129f1b4a93 5 */
pmic 0:86129f1b4a93 6
pmic 0:86129f1b4a93 7 #ifndef LOWPASS_FILTER_H_
pmic 0:86129f1b4a93 8 #define LOWPASS_FILTER_H_
pmic 0:86129f1b4a93 9
pmic 0:86129f1b4a93 10 #include <cstdlib>
pmic 0:86129f1b4a93 11
pmic 0:86129f1b4a93 12 /**
pmic 0:86129f1b4a93 13 * This class implements a time-discrete 2nd order lowpass filter for a series of data values.
pmic 0:86129f1b4a93 14 * This filter can typically be used within a periodic task that takes measurements that need
pmic 0:86129f1b4a93 15 * to be filtered, like speed or position values.
pmic 0:86129f1b4a93 16 */
pmic 0:86129f1b4a93 17 class LowpassFilter {
pmic 0:86129f1b4a93 18
pmic 0:86129f1b4a93 19 public:
pmic 0:86129f1b4a93 20
pmic 0:86129f1b4a93 21 LowpassFilter();
pmic 0:86129f1b4a93 22 virtual ~LowpassFilter();
pmic 0:86129f1b4a93 23 void reset();
pmic 0:86129f1b4a93 24 void reset(float value);
pmic 0:86129f1b4a93 25 void setPeriod(float period);
pmic 0:86129f1b4a93 26 void setFrequency(float frequency);
pmic 0:86129f1b4a93 27 float getFrequency();
pmic 0:86129f1b4a93 28 float filter(float value);
pmic 0:86129f1b4a93 29
pmic 0:86129f1b4a93 30 private:
pmic 0:86129f1b4a93 31
pmic 0:86129f1b4a93 32 float period;
pmic 0:86129f1b4a93 33 float frequency;
pmic 0:86129f1b4a93 34 float a11, a12, a21, a22, b1, b2;
pmic 0:86129f1b4a93 35 float x1, x2;
pmic 0:86129f1b4a93 36 };
pmic 0:86129f1b4a93 37
pmic 0:86129f1b4a93 38 #endif /* LOWPASS_FILTER_H_ */
pmic 0:86129f1b4a93 39
pmic 0:86129f1b4a93 40