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https://github.com/RobTillaart/Arduino.git
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150 lines
2.8 KiB
C++
150 lines
2.8 KiB
C++
//
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// FILE: PulsePattern.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.7
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// DATE: 2012-11-23
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// PURPOSE: Arduino Library to generate repeating pulse patterns
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#include "PulsePattern.h"
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// Predefined generator (singleton)
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PulsePattern PPGenerator;
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ISR(TIMER1_COMPA_vect)
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{
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PPGenerator.worker();
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}
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PulsePattern::PulsePattern()
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{
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_size = 0;
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_state = NOTINIT;
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_ar = NULL;
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_cnt = 0;
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_level = LOW;
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_prescaler = 0;
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_pin = 0;
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}
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void PulsePattern::init(const uint8_t pin, const uint16_t * ar, const uint8_t size,
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const uint8_t level, const uint8_t prescaler)
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{
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_pin = pin;
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pinMode(_pin, OUTPUT);
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stop();
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_ar = (uint16_t *) ar;
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_size = size;
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_level = level ? LOW : HIGH;
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_prescaler = constrain(prescaler, PRESCALE_1, PRESCALE_1024);
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_cnt = 0;
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digitalWrite(_pin, _level);
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_state = STOPPED;
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// fast low level AVR ports
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uint8_t _pinport = digitalPinToPort(_pin);
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_pinout = portOutputRegister(_pinport);
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_pinbit = digitalPinToBitMask(_pin);
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}
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void PulsePattern::start(uint32_t times)
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{
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if (_state == RUNNING) return; // no restart
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_cnt = 0; // start from begin
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_times = times;
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cont();
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}
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void PulsePattern::cont()
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{
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if (_state == RUNNING) return; // no continue
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if (_size == 0) return; // no pattern
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setTimer(1); // start asap
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_state = RUNNING;
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}
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void PulsePattern::stop()
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{
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stopTimer();
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_state = STOPPED;
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_level = LOW;
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digitalWrite(_pin, _level);
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}
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void PulsePattern::worker()
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{
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if (_state != RUNNING) return;
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// set next period & flip signal
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_level = !_level;
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// digitalWrite(_pin, _level);
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// direct port much faster
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if (_level == 0) *_pinout &= ~_pinbit;
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else *_pinout |= _pinbit;
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if (_factor != 4096)
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{
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OCR1A = _ar[_cnt] * _factor * (F_CPU/1000000UL) / 4096;
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}
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else
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{
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OCR1A = _ar[_cnt] * (F_CPU/1000000UL);
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}
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_cnt++;
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if (_cnt >= _size)
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{
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_cnt = 0; // reset pattern
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switch(_times)
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{
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case PP_CONTINUOUS:
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break;
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case 1:
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_times--;
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case 0:
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stop();
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break;
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default:
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_times--;
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break;
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}
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}
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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 PulsePattern::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 PulsePattern::setTimer(const uint16_t cc) const
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{
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TCCR1A = 0; // stop timer first
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TCCR1B = 0;
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TCNT1 = 0; // reset counter
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OCR1A = cc * 16; // compare A register value;
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// * 16 makes max period 4095
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// min period 12?
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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) | _prescaler;
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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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