mirror of
https://github.com/RobTillaart/Arduino.git
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100 lines
1.9 KiB
C++
100 lines
1.9 KiB
C++
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//
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// FILE: PulsePatternOut.cpp
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// AUTHOR: Rob dot Tillaart at gmail dot com
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// VERSION: see PULSEPATTERNOUT_LIB_VERSION in .h
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// PURPOSE: PulsePatternOut library for Arduino
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//
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// HISTORY:
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// 0.0.1 - 2012-11-23 initial version
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//
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// Released to the public domain
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//
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#include "PulsePatternOut.h"
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// TODO PRE 1.0 backwards compat
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#include "Arduino.h"
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enum { NO_CLOCK, PRESCALE_1, PRESCALE_8, PRESCALE_64, PRESCALE_256, PRESCALE_1024 };
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PulsePatternOut::PulsePatternOut(uint8_t pin)
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{
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_pin = pin;
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pinMode(_pin, OUTPUT);
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digitalWrite(_pin, LOW);
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_size = 0;
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_cnt = 0;
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_state = STOPPED;
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}
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PulsePatternOut::~PulsePatternOut()
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{
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}
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void PulsePatternOut::init(uint16_t * ar, uint8_t size, uint8_t level = LOW)
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{
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_ar = ar;
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_size = size;
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_level = level;
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_cnt = 0;
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_state = STOPPED;
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}
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void PulsePatternOut::start()
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{
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if (_size == 0) return;
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if (_state == RUNNING) return;
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setTimer(1); // start asap
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_state = RUNNING;
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}
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void PulsePatternOut::stop()
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{
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stopTimer();
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_state = STOPPED;
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}
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bool PulsePatternOut::isRunning()
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{
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return (_state == RUNNING);
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}
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void PulsePatternOut::worker()
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{
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if (_cnt == _size || _state == STOPPED)
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{
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_state = STOPPED;
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_cnt = 0;
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stopTimer();
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return;
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}
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_level = !_level;
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// improve - absorb digitalwrite details here
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digitalWrite(_pin, _level);
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setTimer(_ar[_cnt]);
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_cnt++;
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}
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// TIMER code based upon - http://www.gammon.com.au/forum/?id=11504
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void PulsePatternOut::stopTimer()
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{
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TCCR1A = 0; // reset timer 1
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TCCR1B = 0;
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}
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void PulsePatternOut::setTimer(uint16_t cc)
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{
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TCCR1A = 0; // reset timer 1
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TCCR1B = 0;
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TCNT1 = 0; // reset counter
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OCR1A = cc*2; // compare A register value;
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// 4: CTC mode, top = OCR1A
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TCCR1A = _BV (COM1A1); // clear on compare
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TCCR1B = _BV (WGM12) | PRESCALE_1024; // should be PRESCALE_8
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TIFR1 |= _BV (OCF1A); // clear interrupt flag
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TIMSK1 = _BV (OCIE1A); // interrupt on Compare A Match
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}
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// END OF FILE
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