207 lines
5.4 KiB
C++
207 lines
5.4 KiB
C++
#include <Arduino.h>
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#include <IRSender.h>
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// Heavily based on Ken Shirriff's IRRemote library:
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// https://github.com/shirriff/Arduino-IRremote
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//
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// For PWM on Arduino, see http://playground.arduino.cc/Main/TimerPWMCheatsheet
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IRSender::IRSender(uint8_t pin)
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{
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_pin = pin;
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}
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// Set the PWM frequency. The selected pin determines which timer to use
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void IRSender::setFrequency(int frequency)
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{
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uint8_t pwmval8 = F_CPU / 2000 / (frequency);
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uint16_t pwmval16 = F_CPU / 2000 / (frequency);
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pinMode(_pin, OUTPUT);
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digitalWrite(_pin, LOW); // When not sending PWM, we want it low
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switch (_pin)
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{
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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// Arduino Mega
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case 9:
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// Fall-through to 10, timer2 controls both 9 and 10
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case 10:
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TCCR2A = _BV(WGM20);
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TCCR2B = _BV(WGM22) | _BV(CS20);
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OCR2A = pwmval8;
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OCR2B = pwmval8 / 3;
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break;
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case 11:
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// Fall-through to 12, timer1 controls both 11 and 12
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case 12:
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TCCR1A = _BV(WGM11);
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TCCR1B = _BV(WGM13) | _BV(CS10);
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ICR1 = pwmval16;
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OCR1A = pwmval16 / 3;
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OCR1B = pwmval16 / 3;
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break;
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case 44:
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// Fall-through to 46, timer 5 controls pins 44, 45 and 46 on Arduino Mega
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case 45:
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case 46:
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TCCR5A = _BV(WGM51) | _BV(WGM50);
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TCCR5B = _BV(WGM53) | _BV(CS50);
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ICR5 = pwmval16;
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OCR5A = pwmval16 / 3;
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#else
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// Arduino Duemilanove etc
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case 3:
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// Fall-through to 11, timer2 controls both 3 and 11
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case 11:
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TCCR2A = _BV(WGM20);
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TCCR2B = _BV(WGM22) | _BV(CS20);
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OCR2A = pwmval8;
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OCR2B = pwmval8 / 3;
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break;
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case 9:
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// Fall-through to 10, timer1 controls both 9 and 10
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case 10:
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TCCR1A = _BV(WGM11);
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TCCR1B = _BV(WGM13) | _BV(CS10);
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ICR1 = pwmval16;
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OCR1A = pwmval16 / 3;
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OCR1B = pwmval16 / 3;
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break;
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#endif
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}
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}
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// Send a uint8_t (8 bits) over IR
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void IRSender::sendIRbyte(uint8_t sendByte, int bitMarkLength, int zeroSpaceLength, int oneSpaceLength)
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{
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for (int i=0; i<8 ; i++)
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{
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if (sendByte & 0x01)
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{
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mark(bitMarkLength);
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space(oneSpaceLength);
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}
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else
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{
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mark(bitMarkLength);
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space(zeroSpaceLength);
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}
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sendByte >>= 1;
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}
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}
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// The Carrier IR protocol has the bits in a reverse order (compared to the other heatpumps)
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// See http://www.nrtm.org/index.php/2013/07/25/reverse-bits-in-a-uint8_t/
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uint8_t IRSender::bitReverse(uint8_t x)
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{
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// 01010101 | 10101010
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x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa);
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// 00110011 | 11001100
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x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc);
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// 00001111 | 11110000
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x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);
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return x;
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}
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// Send an IR 'mark' symbol, i.e. transmitter ON
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void IRSender::mark(int markLength)
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{
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switch (_pin)
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{
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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// Arduino Mega
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case 9:
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(TCCR2A |= _BV(COM2B1)); // Enable pin 3 PWM output
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break;
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case 11:
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(TCCR1A |= _BV(COM1A1)); // Enable pin 9 PWM output
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break;
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case 12:
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(TCCR1A |= _BV(COM1B1)); // Enable pin 10 PWM output
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break;
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case 10:
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(TCCR2A |= _BV(COM2A1)); // Enable pin 11 PWM output
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break;
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case 44:
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(TCCR5A |= _BV(COM5C1)); // Enable pin 44 PWM output on Arduino Mega
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break;
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case 45:
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(TCCR5A |= _BV(COM5B1)); // Enable pin 45 PWM output on Arduino Mega
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break;
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case 46:
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(TCCR5A |= _BV(COM5A1)); // Enable pin 46 PWM output on Arduino Mega
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break;
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#else
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// Arduino Duemilanove etc
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case 3:
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(TCCR2A |= _BV(COM2B1)); // Enable pin 3 PWM output
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break;
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case 9:
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(TCCR1A |= _BV(COM1A1)); // Enable pin 9 PWM output
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break;
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case 10:
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(TCCR1A |= _BV(COM1B1)); // Enable pin 10 PWM output
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break;
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case 11:
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(TCCR2A |= _BV(COM2A1)); // Enable pin 11 PWM output
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break;
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#endif
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}
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delayMicroseconds(markLength);
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}
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// Send an IR 'space' symbol, i.e. transmitter OFF
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void IRSender::space(int spaceLength)
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{
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switch (_pin)
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{
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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// Arduino Mega
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case 9:
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(TCCR2A &= ~(_BV(COM2B1))); // Disable pin 3 PWM output
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break;
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case 11:
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(TCCR1A &= ~(_BV(COM1A1))); // Disable pin 9 PWM output
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break;
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case 12:
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(TCCR1A &= ~(_BV(COM1B1))); // Disable pin 10 PWM output
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break;
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case 10:
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(TCCR2A &= ~(_BV(COM2A1))); // Disable pin 11 PWM output
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break;
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case 44:
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(TCCR5A &= ~(_BV(COM5C1))); // Disable pin 44 PWM output on Arduino Mega
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case 45:
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(TCCR5A &= ~(_BV(COM5B1))); // Disable pin 45 PWM output on Arduino Mega
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case 46:
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(TCCR5A &= ~(_BV(COM5A1))); // Disable pin 46 PWM output on Arduino Mega
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#else
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// Arduino Duemilanove etc
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case 3:
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(TCCR2A &= ~(_BV(COM2B1))); // Disable pin 3 PWM output
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break;
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case 9:
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(TCCR1A &= ~(_BV(COM1A1))); // Disable pin 9 PWM output
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break;
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case 10:
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(TCCR1A &= ~(_BV(COM1B1))); // Disable pin 10 PWM output
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break;
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case 11:
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(TCCR2A &= ~(_BV(COM2A1))); // Disable pin 11 PWM output
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break;
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#endif
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}
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// Mitsubishi heatpump uses > 16383us spaces, and delayMicroseconds only works up to 2^14 - 1 us
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// Use the less accurate milliseconds delay for longer delays
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if (spaceLength < 16383) {
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delayMicroseconds(spaceLength);
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} else {
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delay(spaceLength/1000);
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}
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}
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