Measurement of low frequencys based on timing between pulses
Dependents: Energy_Meter_S0_Example
Pulses.cpp
- Committer:
- jocis
- Date:
- 2012-11-08
- Revision:
- 1:6eb686d7d16a
- Parent:
- 0:ef402fb370c5
- Child:
- 2:fc21262db17a
File content as of revision 1:6eb686d7d16a:
#include "Pulses.h" ////////////////////////////////////////////////////////////////////////////////// Pulses::Pulses(PinName inPin, PulseType type, unsigned int timeout, unsigned int counter) : _in(inPin) { _timer.reset(); _timer.start(); _ActTime = 0; _MinTime = 0; _MaxTime = 0; _AvrTimeSum = 0; _AvrTimeCount = 0; _Counter = counter; _Factor = 1.0f; _bFirst = true; if ( timeout > 900 ) timeout = 900; // not more than 15 minutes _Timeout = timeout; _TimeoutCount = 0; _type = type; if ( type & RISE ) { _in.rise(this, &Pulses::callback_in); _in.mode(PullDown); } if ( type & FALL ) { _in.fall(this, &Pulses::callback_in); _in.mode(PullUp); } _timeout.attach(this, &Pulses::callback_timeout, 1); } ////////////////////////////////////////////////////////////////////////////////// float Pulses::getAct() { if ( _ActTime == 0 ) return 0.0f; return 1000000.0f * _Factor / (float)_ActTime; } ////////////////////////////////////////////////////////////////////////////////// float Pulses::getAverage() { unsigned int avrTimeSum = 0; unsigned int avrTimeCount = 0; __disable_irq(); // Disable Interrupts for atomic copy avrTimeSum = _AvrTimeSum; avrTimeCount = _AvrTimeCount; _AvrTimeSum = 0; _AvrTimeCount = 0; __enable_irq(); // Enable Interrupts if ( avrTimeCount == 0 ) return -1.0f; return 1000000.0f * _Factor / ( (float)avrTimeSum / (float)avrTimeCount ); } ////////////////////////////////////////////////////////////////////////////////// void Pulses::get(float *pAverage, float *pMin, float *pMax, float *pSum) { unsigned int minTime = 0; unsigned int maxTime = 0; unsigned int avrTimeSum = 0; unsigned int avrTimeCount = 0; __disable_irq(); // Disable Interrupts for atomic copy minTime = _MinTime; maxTime = _MaxTime; avrTimeSum = _AvrTimeSum; avrTimeCount = _AvrTimeCount; _MinTime = 0; _MaxTime = 0; _AvrTimeSum = 0; _AvrTimeCount = 0; __enable_irq(); // Enable Interrupts if ( pAverage ) { if ( avrTimeCount == 0 ) *pAverage = -1.0f; else *pAverage = 1000000.0f * _Factor / ( (float)avrTimeSum / (float)avrTimeCount ); } if ( pMin ) { if ( minTime == 0 ) *pMin = -1.0f; else *pMin = 1000000.0f * _Factor / (float)minTime; } if ( pMax ) { if ( maxTime == 0 ) *pMax = -1.0f; else *pMax = 1000000.0f * _Factor / (float)maxTime; } if ( pSum ) { *pSum = _Factor * (float)_Counter; } return; } ////////////////////////////////////////////////////////////////////////////////// unsigned int Pulses::getCounter() { return _Counter; } ////////////////////////////////////////////////////////////////////////////////// void Pulses::setFactor(float factor) { _Factor = factor; } ////////////////////////////////////////////////////////////////////////////////// void Pulses::callback_in() { unsigned int diff = _timer.readDiff_us(); _Counter++; _TimeoutCount = 0; if ( _bFirst ) { // ignore first pulse to synchronize timer (maybe timer overflow) _bFirst = false; return; } _ActTime = diff; _AvrTimeSum += diff; _AvrTimeCount++; if ( _MinTime==0 || _MinTime<diff ) _MinTime = diff; if ( _MaxTime==0 || _MaxTime>diff ) _MaxTime = diff; } ////////////////////////////////////////////////////////////////////////////////// void Pulses::callback_timeout() { _TimeoutCount++; if ( _TimeoutCount >= _Timeout ) { _TimeoutCount = 0; _ActTime = 0; _bFirst = true; } } //////////////////////////////////////////////////////////////////////////////////