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IRTimer.hpp
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/**
* @file IRTimer.hpp
*
* @brief All timer specific definitions are contained in this file.
* Sets IR_SEND_PIN if required, e.g. if SEND_PWM_BY_TIMER for AVR is defined, which restricts the output to a dedicated pin number
*
* timerConfigForSend(aFrequencyKHz) must set output pin mode and disable receive interrupt if it uses the same resource
*
* This file is part of Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
*
*************************************************************************************
* MIT License
*
* Copyright (c) 2021-2023 Armin Joachimsmeyer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is furnished
* to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
************************************************************************************
*/
#ifndef _IR_TIMER_HPP
#define _IR_TIMER_HPP
/** \addtogroup HardwareDependencies CPU / board dependent definitions
* @{
*/
/** \addtogroup Timer Usage of timers for the different CPU / boards
* @{
*/
/*
* Functions declared here
*/
void timerResetInterruptPending();
void timerEnableReceiveInterrupt();
void timerDisableReceiveInterrupt();
void timerConfigForReceive();
void enableSendPWMByTimer();
void disableSendPWMByTimer();
void timerConfigForSend(uint16_t aFrequencyKHz);
#if defined(SEND_PWM_BY_TIMER) && ( (defined(ESP32) || defined(ARDUINO_ARCH_RP2040) || defined(PARTICLE)) || defined(ARDUINO_ARCH_MBED) )
#define SEND_PWM_DOES_NOT_USE_RECEIVE_TIMER // Receive timer and send generation are independent, so it is recommended to always define SEND_PWM_BY_TIMER
#endif
#if defined(IR_SEND_PIN) && defined(SEND_PWM_BY_TIMER) && !defined(SEND_PWM_DOES_NOT_USE_RECEIVE_TIMER) // For e.g ESP32 IR_SEND_PIN definition is useful
#undef IR_SEND_PIN // avoid warning below, user warning is done at IRremote.hpp
#endif
// Macros for enabling timers for development
//#define SEND_PWM_BY_TIMER
//#define IR_USE_AVR_TIMER1
//#define IR_USE_AVR_TIMER2
//#define IR_USE_AVR_TIMER3
//#define IR_USE_AVR_TIMER4
//#define IR_USE_AVR_TIMER4_HS
//#define IR_USE_AVR_TIMER5
//#define IR_USE_AVR_TIMER_TINY0
//#define IR_USE_AVR_TIMER_TINY1
//#define IR_USE_AVR_TIMER_A
//#define IR_USE_AVR_TIMER_B
//#define IR_USE_AVR_TIMER_D
//#define __MK20DX128__
//#define __MKL26Z64__
//#define __IMXRT1062__
//#define ESP8266
//#define ESP32
//#define ARDUINO_ARCH_SAMD
//#define ARDUINO_ARCH_MBED
//#define ARDUINO_ARCH_RP2040
//#define NRF5
//#define __STM32F1__
//#define STM32F1xx
//#define PARTICLE
#if defined (DOXYGEN)
/**
* Hardware / timer dependent pin number for sending IR if SEND_PWM_BY_TIMER is defined. Otherwise used as default for IrSender.sendPin.
*/
#define IR_SEND_PIN
/**
* Configures the timer to be able to generate the receive sample interrupt,
* which consumes a small amount of CPU every 50 (MICROS_PER_TICK) us.
* The actual interrupt generation is controlled by timerEnableReceiveInterrupt() and timerDisableReceiveInterrupt().
* timerConfigForReceive() is used exclusively by IRrecv::start()
*/
void timerConfigForReceive() {
}
/**
* Enables the receive sample timer interrupt, which consumes a small amount of CPU every 50 us.
*/
void timerEnableReceiveInterrupt() {
}
/**
* Disables the receive sample timer interrupt. This must be done before using the timer for e.g. tone().
* Is a synonym for calling end() or stop().
*/
void timerDisableReceiveInterrupt() {
}
/**
* IF PWM should be generated not by software, but by a timer, this function sets output pin mode,
* configures the timer for generating a PWM with duty cycle of IR_SEND_DUTY_CYCLE_PERCENT
* and disables the receive interrupt if it uses the same resource.
* For most architectures, the pin number(s) which can be used for output is determined by the timer used!
* The output of the PWM signal is controlled by enableSendPWMByTimer() and disableSendPWMByTimer().
* timerConfigForSend() is used exclusively by IRsend::enableIROut().
* @param aFrequencyKHz Frequency of the sent PWM signal in kHz. There is no practical reason to have a sub kHz resolution for sending frequency :-).
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
}
/**
* Enables output of the PWM signal of the timer at the timer pin.
*/
void enableSendPWMByTimer() {
}
/**
* Disables output of the PWM signal of the timer at the timer pin and set it to inactive.
*/
void disableSendPWMByTimer() {
}
#elif defined(__AVR__)
/**********************************************************************************************************************
* Mapping of AVR boards to AVR timers
* For some CPU's you have the option to switch the timer and the hardware send pin
**********************************************************************************************************************/
/***************************************
* Plain AVR CPU's, no boards
***************************************/
// Arduino Duemilanove, Diecimila, LilyPad, Mini, Fio, Nano, etc
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328PB__) || defined(__AVR_ATmega168__) \
|| defined(__AVR_ATmega88P__) || defined(__AVR_ATmega88PB__)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER2)
//#define IR_USE_AVR_TIMER1 // send pin = pin 9
#define IR_USE_AVR_TIMER2 // send pin = pin 3
# endif
// Arduino Mega
#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER2) && !defined(IR_USE_AVR_TIMER3) && !defined(IR_USE_AVR_TIMER4) && !defined(IR_USE_AVR_TIMER5)
//#define IR_USE_AVR_TIMER1 // send pin = pin 11
#define IR_USE_AVR_TIMER2 // send pin = pin 9
//#define IR_USE_AVR_TIMER3 // send pin = pin 5
//#define IR_USE_AVR_TIMER4 // send pin = pin 6
//#define IR_USE_AVR_TIMER5 // send pin = pin 46
# endif
// Leonardo
#elif defined(__AVR_ATmega32U4__) && ! defined(TEENSYDUINO) && ! defined(ARDUINO_AVR_PROMICRO)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER3) && !defined(IR_USE_AVR_TIMER4_HS)
//#define IR_USE_AVR_TIMER1 // send pin = pin 9
#define IR_USE_AVR_TIMER3 // send pin = pin 5
//#define IR_USE_AVR_TIMER4_HS // send pin = pin 13
# endif
// Nano Every, Uno WiFi Rev2 and similar
#elif defined(__AVR_ATmega808__) || defined(__AVR_ATmega809__) || defined(__AVR_ATmega3208__) || defined(__AVR_ATmega3209__) \
|| defined(__AVR_ATmega1608__) || defined(__AVR_ATmega1609__) || defined(__AVR_ATmega4808__) || defined(__AVR_ATmega4809__) || defined(__AVR_ATtiny1604__)
# if !defined(IR_USE_AVR_TIMER_B)
#define IR_USE_AVR_TIMER_B // send pin = pin 6 on ATmega4809 1 on ATmega4809
# endif
#elif defined(__AVR_ATtiny816__) || defined(__AVR_ATtiny1614__) || defined(__AVR_ATtiny1616__) || defined(__AVR_ATtiny3216__) || defined(__AVR_ATtiny3217__) // e.g. TinyCore boards
# if !defined(IR_USE_AVR_TIMER_A) && !defined(IR_USE_AVR_TIMER_D)
#define IR_USE_AVR_TIMER_A // use this if you use MegaTinyCore, Tone is on TCB and millis() on TCD
//#define IR_USE_AVR_TIMER_D // use this if you use TinyCore
# endif
// ATmega8u2, ATmega16U2, ATmega32U2, ATmega8 - Timer 2 does not work with existing code below
#elif defined(__AVR_ATmega8U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega8__)
# if !defined(IR_USE_AVR_TIMER1)
#define IR_USE_AVR_TIMER1 // send pin = pin C6
# endif
// ATtiny84
#elif defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny88__)
# if !defined(IR_USE_AVR_TIMER1)
#define IR_USE_AVR_TIMER1 // send pin = pin 6
# endif
#elif defined(__AVR_ATtiny87__) || defined(__AVR_ATtiny167__)
# if !defined(IR_USE_AVR_TIMER1)
#define IR_USE_AVR_TIMER1 // send pin = pin PB1 / 8
# endif
#define USE_TIMER_CHANNEL_B
//ATtiny85, 45, 25
#elif defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
# if !defined(IR_USE_AVR_TIMER_TINY0) && !defined(IR_USE_AVR_TIMER_TINY1)
# if defined(ARDUINO_AVR_DIGISPARK) // tested with 16 and 8 MHz
#define IR_USE_AVR_TIMER_TINY0 // send pin = pin 1
// standard Digispark settings use timer 1 for millis() and micros()
# else
// standard ATTinyCore settings use timer 0 for millis() and micros()
#define IR_USE_AVR_TIMER_TINY1 // send pin = pin 4
# endif
# endif
/***************************************
* SPARKFUN Pro Micro board
***************************************/
#elif defined(ARDUINO_AVR_PROMICRO)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER3) && !defined(IR_USE_AVR_TIMER4_HS)
//#define IR_USE_AVR_TIMER1 // send pin = pin 9
#define IR_USE_AVR_TIMER3 // send pin = pin 5
//#define IR_USE_AVR_TIMER4_HS // send pin = pin 13
# endif
/***************************************
* TEENSY Boards
***************************************/
// Teensy 1.0
#elif defined(__AVR_AT90USB162__)
# if !defined(IR_USE_AVR_TIMER1)
#define IR_USE_AVR_TIMER1 // send pin = pin 17
# endif
// Teensy++ 1.0 & 2.0
#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER2) && !defined(IR_USE_AVR_TIMER3)
//#define IR_USE_AVR_TIMER1 // send pin = pin 25
#define IR_USE_AVR_TIMER2 // send pin = pin 1
//#define IR_USE_AVR_TIMER3 // send pin = pin 16
# endif
// Teensy 2.0
#elif defined(__AVR_ATmega32U4__) && defined(TEENSYDUINO)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER3) && !defined(IR_USE_AVR_TIMER4_HS)
//#define IR_USE_AVR_TIMER1 // send pin = pin 14 (Teensy 2.0 - physical pin: B5)
//#define IR_USE_AVR_TIMER3 // send pin = pin 9 (Teensy 2.0 - physical pin: C6)
#define IR_USE_AVR_TIMER4_HS // send pin = pin 10 (Teensy 2.0 - physical pin: C7)
# endif
/***************************************
* CPU's with MegaCore
***************************************/
// MegaCore - ATmega64, ATmega128
#elif defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2560__)
# if !defined(IR_USE_AVR_TIMER1)
#define IR_USE_AVR_TIMER1 // send pin = pin 13
# endif
/***************************************
* CPU's with MajorCore
***************************************/
#elif defined(__AVR_ATmega8515__) || defined(__AVR_ATmega162__)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER3)
#define IR_USE_AVR_TIMER1 // send pin = pin 13
//#define IR_USE_AVR_TIMER3 // send pin = pin 12 - ATmega162 only
# endif
/***************************************
* CPU's with MightyCore
***************************************/
// MightyCore - ATmega1284
#elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER2) && !defined(IR_USE_AVR_TIMER3)
//#define IR_USE_AVR_TIMER1 // send pin = pin 13
#define IR_USE_AVR_TIMER2 // send pin = pin 14
//#define IR_USE_AVR_TIMER3 // send pin = pin 6
# endif
// MightyCore - ATmega164, ATmega324, ATmega644
#elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) \
|| defined(__AVR_ATmega324P__) || defined(__AVR_ATmega324A__) \
|| defined(__AVR_ATmega324PA__) || defined(__AVR_ATmega164A__) \
|| defined(__AVR_ATmega164P__)
# if !defined(IR_USE_AVR_TIMER1) && !defined(IR_USE_AVR_TIMER2)
//#define IR_USE_AVR_TIMER1 // send pin = pin 13
#define IR_USE_AVR_TIMER2 // send pin = pin 14
# endif
// MightyCore - ATmega8535, ATmega16, ATmega32
#elif defined(__AVR_ATmega8535__) || defined(__AVR_ATmega16__) || defined(__AVR_ATmega32__)
# if !defined(IR_USE_AVR_TIMER1)
#define IR_USE_AVR_TIMER1 // send pin = pin 13
# endif
#endif // AVR CPU's
/**********************************************************************************************************************
* End of AVR mapping, start of AVR timers
**********************************************************************************************************************/
/*
* AVR Timer1 (16 bits)
*/
#if defined(IR_USE_AVR_TIMER1)
# if defined(TIMSK1)
#define TIMSK TIMSK1 // use the value of TIMSK1 for the statements below
# endif
void timerEnableReceiveInterrupt() {
TIMSK |= _BV(OCIE1A);
}
void timerDisableReceiveInterrupt() {
TIMSK &= ~_BV(OCIE1A);
}
# if defined(USE_TIMER_CHANNEL_B)
# if defined(TIMER1_COMPB_vect)
#define TIMER_INTR_NAME TIMER1_COMPB_vect
# elif defined(TIM1_COMPB_vect)
#define TIMER_INTR_NAME TIM1_COMPB_vect
# endif
#else
# if defined(TIMER1_COMPA_vect)
#define TIMER_INTR_NAME TIMER1_COMPA_vect
# elif defined(TIM1_COMPA_vect)
#define TIMER_INTR_NAME TIM1_COMPA_vect
# endif
# endif
void timerConfigForReceive() {
TCCR1A = 0;
TCCR1B = _BV(WGM12) | _BV(CS10); // CTC mode, no prescaling
OCR1A = (F_CPU * MICROS_PER_TICK) / MICROS_IN_ONE_SECOND; // 16 * 50 = 800
TCNT1 = 0;
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(CORE_OC1A_PIN)
#define IR_SEND_PIN CORE_OC1A_PIN // Teensy
# elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define IR_SEND_PIN 11 // Arduino Mega
// MightyCore, MegaCore, MajorCore
# elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) \
|| defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) \
|| defined(__AVR_ATmega324P__) || defined(__AVR_ATmega324A__) \
|| defined(__AVR_ATmega324PA__) || defined(__AVR_ATmega164A__) \
|| defined(__AVR_ATmega164P__) || defined(__AVR_ATmega32__) \
|| defined(__AVR_ATmega16__) || defined(__AVR_ATmega8535__) \
|| defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__) \
|| defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__) \
|| defined(__AVR_ATmega8515__) || defined(__AVR_ATmega162__)
#define IR_SEND_PIN 13
# elif defined(__AVR_ATtiny84__)
#define IR_SEND_PIN 6
# elif defined(__AVR_ATtiny88__)
#define IR_SEND_PIN 8
# elif defined(__AVR_ATtiny87__) || defined(__AVR_ATtiny167__)
/*
* !!! IR_SEND_PIN value must correspond to ENABLE_SEND_PWM_BY_TIMER below !!!
*/
# if defined(USE_TIMER_CHANNEL_B)
#define IR_SEND_PIN PIN_PB1 // OC1BU / PB1 / Pin9 at ATTinyCore
//#define IR_SEND_PIN PIN_PB3 // OC1BV / PB3 / Pin11 at ATTinyCore
//#define IR_SEND_PIN PIN_PB5 // OC1BW / PB5 / Pin13 at ATTinyCore
//#define IR_SEND_PIN PIN_PB7 // OC1BX / PB7 / Pin15 at ATTinyCore
# else
#define IR_SEND_PIN PIN_PB0 // OC1AU / PB1 / Pin8 at ATTinyCore
//#define IR_SEND_PIN PIN_PB2 // OC1AV / PB3 / Pin10 at ATTinyCore
//#define IR_SEND_PIN PIN_PB4 // OC1AW / PB5 / Pin12 at ATTinyCore
//#define IR_SEND_PIN PIN_PB6 // OC1AX / PB6 / Pin14 at ATTinyCore
# endif
# else
#define IR_SEND_PIN 9 // OC1A Arduino Duemilanove, Diecimila, LilyPad, Sparkfun Pro Micro, Leonardo, MH-ET Tiny88 etc.
# endif // defined(CORE_OC1A_PIN)
# if defined(__AVR_ATtiny87__) || defined(__AVR_ATtiny167__)
// Clear OC1A/OC1B on Compare Match when up-counting. Set OC1A/OC1B on Compare Match when down counting.
# if defined(USE_TIMER_CHANNEL_B)
void enableSendPWMByTimer() {
TCNT1 = 0;
TCCR1A |= _BV(COM1B1);
TCCR1D |= _BV(OC1BU); // + enable OC1BU as output
//TCNT1 = 0; TCCR1A |= _BV(COM1B1); TCCR1D |= _BV(OC1BV); // + enable OC1BV as output
//TCNT1 = 0; TCCR1A |= _BV(COM1B1); TCCR1D |= _BV(OC1BW); // + enable OC1BW as output
//TCNT1 = 0; TCCR1A |= _BV(COM1B1); TCCR1D |= _BV(OC1BX); // + enable OC1BX as output
}
# else
void disableSendPWMByTimer() {
TCNT1 = 0;
TCCR1A |= _BV(COM1A1);
TCCR1D |= _BV(OC1AU); // + enable OC1BU as output
//TCNT1 = 0; TCCR1A |= _BV(COM1A1); TCCR1D |= _BV(OC1AV); // + enable OC1BV as output
//TCNT1 = 0; TCCR1A |= _BV(COM1A1); TCCR1D |= _BV(OC1AW); // + enable OC1BW as output
//TCNT1 = 0; TCCR1A |= _BV(COM1A1); TCCR1D |= _BV(OC1AX); // + enable OC1BX as output
}
# endif
void disableSendPWMByTimer() {
TCCR1D = 0;
}
# else
# if defined(USE_TIMER_CHANNEL_B)
void enableSendPWMByTimer() {
TCNT1 = 0; (TCCR1A |= _BV(COM1B1)) // Clear OC1A/OC1B on Compare Match when up-counting. Set OC1A/OC1B on Compare Match when downcounting.
}
void disableSendPWMByTimer() {
TCCR1A &= ~(_BV(COM1B1));
}
# else
void enableSendPWMByTimer() {
TCNT1 = 0;
TCCR1A |= _BV(COM1A1); // Clear OC1A/OC1B on Compare Match when up-counting. Set OC1A/OC1B on Compare Match when downcounting.
}
void disableSendPWMByTimer() {
TCCR1A &= ~(_BV(COM1A1));
}
# endif
# endif
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
timerDisableReceiveInterrupt();
# if (((F_CPU / 2000) / 38) < 256)
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz); // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of Phase Correct PWM
TCCR1A = _BV(WGM11); // PWM, Phase Correct, Top is ICR1
TCCR1B = _BV(WGM13) | _BV(CS10); // CS10 -> no prescaling
ICR1 = tPWMWrapValue - 1;
# if defined(USE_TIMER_CHANNEL_B)
OCR1B = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
# else
OCR1A = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
# endif
TCNT1 = 0; // not really required, since we have an 8 bit counter, but makes the signal more reproducible
# else
const uint16_t tPWMWrapValue = ((F_CPU / 8) / 2000) / (aFrequencyKHz); // 2000 instead of 1000 because of Phase Correct PWM
TCCR1A = _BV(WGM11);// PWM, Phase Correct, Top is ICR1
TCCR1B = _BV(WGM13) | _BV(CS11);// CS11 -> Prescaling by 8
ICR1 = tPWMWrapValue - 1;
# if defined(USE_TIMER_CHANNEL_B)
OCR1A = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
# else
OCR1A = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
# endif
TCNT1 = 0; // not really required, since we have an 8 bit counter, but makes the signal more reproducible
# endif
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer2 (8 bits) // Tone timer on UNO
*/
#elif defined(IR_USE_AVR_TIMER2)
void timerEnableReceiveInterrupt() {
TIMSK2 = _BV(OCIE2B); // Output Compare Match A Interrupt Enable
}
void timerDisableReceiveInterrupt() {
TIMSK2 = 0;
}
#define TIMER_INTR_NAME TIMER2_COMPB_vect // We use TIMER2_COMPB_vect to be compatible with tone() library
#define TIMER_COUNT_TOP (F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND)
void timerConfigForReceive() {
# if (TIMER_COUNT_TOP < 256)
TCCR2A = _BV(WGM21);
TCCR2B = _BV(CS20);
OCR2A = TIMER_COUNT_TOP;
OCR2B = TIMER_COUNT_TOP;
TCNT2 = 0;
# else
TCCR2A = _BV(WGM21);
TCCR2B = _BV(CS21);
OCR2A = TIMER_COUNT_TOP / 8;
OCR2B = TIMER_COUNT_TOP / 8;
TCNT2 = 0;
# endif
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(CORE_OC2B_PIN)
#define IR_SEND_PIN CORE_OC2B_PIN // Teensy
# elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define IR_SEND_PIN 9 // Arduino Mega
# elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) \
|| defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) \
|| defined(__AVR_ATmega324P__) || defined(__AVR_ATmega324A__) \
|| defined(__AVR_ATmega324PA__) || defined(__AVR_ATmega164A__) \
|| defined(__AVR_ATmega164P__)
#define IR_SEND_PIN 14 // MightyCore, MegaCore
# else
#define IR_SEND_PIN 3 // Arduino Duemilanove, Diecimila, LilyPad, etc
# endif // defined(CORE_OC2B_PIN)
void enableSendPWMByTimer() {
TCNT2 = 0;
TCCR2A |= _BV(COM2B1); // Clear OC2B on Compare Match
}
void disableSendPWMByTimer() {
TCCR2A &= ~(_BV(COM2B1)); // Normal port operation, OC2B disconnected.
}
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
timerDisableReceiveInterrupt();
# if (((F_CPU / 2000) / 38) < 256)
/*
* tPWMWrapValue is 210.52 for 38 kHz, 17.58 for 455 kHz @16 MHz clock.
* 210 -> 38.095 kHz, 17 -> 470.588 kHz @16 MHz clock.
* We use 2000 instead of 1000 in the formula, because of Phase Correct PWM.
*/
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz);
TCCR2A = _BV(WGM20); // PWM, Phase Correct, Top is OCR2A
TCCR2B = _BV(WGM22) | _BV(CS20); // CS20 -> no prescaling
OCR2A = tPWMWrapValue - 1; // The top value for the timer. The modulation frequency will be F_CPU / 2 / (OCR2A + 1).
OCR2B = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT2 = 0; // not really required, since we have an 8 bit counter, but makes the signal more reproducible
# else
const uint16_t tPWMWrapValue = ((F_CPU / 8) / 2000) / (aFrequencyKHz); // 2000 instead of 1000 because of Phase Correct PWM
TCCR2A = _BV(WGM20);// PWM, Phase Correct, Top is OCR2A
TCCR2B = _BV(WGM22) | _BV(CS21);// CS21 -> Prescaling by 8
OCR2A = tPWMWrapValue - 1;
OCR2B = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT2 = 0;// not really required, since we have an 8 bit counter, but makes the signal more reproducible
# endif
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer3 (16 bits)
*/
#elif defined(IR_USE_AVR_TIMER3)
void timerEnableReceiveInterrupt() {
TIMSK3 = _BV(OCIE3B);
}
void timerDisableReceiveInterrupt() {
TIMSK3 = 0;
}
#define TIMER_INTR_NAME TIMER3_COMPB_vect
void timerConfigForReceive() {
TCCR3A = 0;
TCCR3B = _BV(WGM32) | _BV(CS30);
OCR3A = F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND;
OCR3B = F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND;
TCNT3 = 0;
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(CORE_OC3A_PIN)
#define IR_SEND_PIN CORE_OC3A_PIN // Teensy
# elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) \
|| defined(__AVR_ATmega32U4__) || defined(ARDUINO_AVR_PROMICRO)
#define IR_SEND_PIN 5 // Arduino Mega, Arduino Leonardo, Sparkfun Pro Micro
# elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__)
#define IR_SEND_PIN 6 // MightyCore, MegaCore
# else
#error Please add OC3A pin number here
# endif
void enableSendPWMByTimer() {
TCNT3 = 0;
TCCR3A |= _BV(COM3A1);
}
void disableSendPWMByTimer() {
TCCR3A &= ~(_BV(COM3A1));
}
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
#if F_CPU > 16000000
#error "Creating timer PWM with timer 3 is not supported for F_CPU > 16 MHz"
#endif
timerDisableReceiveInterrupt();
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz); // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of Phase Correct PWM
TCCR3A = _BV(WGM31);
TCCR3B = _BV(WGM33) | _BV(CS30); // PWM, Phase Correct, ICRn as TOP, complete period is double of tPWMWrapValue
ICR3 = tPWMWrapValue - 1;
OCR3A = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT3 = 0; // required, since we have an 16 bit counter
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer4 (16 bits)
*/
#elif defined(IR_USE_AVR_TIMER4)
void timerEnableReceiveInterrupt() {
TIMSK4 = _BV(OCIE4A);
}
void timerDisableReceiveInterrupt() {
TIMSK4 = 0;
}
#define TIMER_INTR_NAME TIMER4_COMPA_vect
void timerConfigForReceive() {
TCCR4A = 0;
TCCR4B = _BV(WGM42) | _BV(CS40);
OCR4A = F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND;
TCNT4 = 0;
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(CORE_OC4A_PIN)
#define IR_SEND_PIN CORE_OC4A_PIN
# elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define IR_SEND_PIN 6 // Arduino Mega
# else
#error Please add OC4A pin number here
# endif
void enableSendPWMByTimer() {
TCNT4 = 0;
TCCR4A |= _BV(COM4A1);
}
void disableSendPWMByTimer() {
TCCR4A &= ~(_BV(COM4A1));
}
void timerConfigForSend(uint16_t aFrequencyKHz) {
#if F_CPU > 16000000
#error "Creating timer PWM with timer 4 is not supported for F_CPU > 16 MHz"
#endif
timerDisableReceiveInterrupt();
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz); // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of Phase Correct PWM
TCCR4A = _BV(WGM41);
TCCR4B = _BV(WGM43) | _BV(CS40);
ICR4 = tPWMWrapValue - 1;
OCR4A = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT4 = 0; // required, since we have an 16 bit counter
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer4 (10 bits, high speed option)
*/
#elif defined(IR_USE_AVR_TIMER4_HS)
void timerEnableReceiveInterrupt() {
TIMSK4 = _BV(TOIE4);
}
void timerDisableReceiveInterrupt() {
TIMSK4 = 0;
}
#define TIMER_INTR_NAME TIMER4_OVF_vect
void timerConfigForReceive() {
TCCR4A = 0;
TCCR4B = _BV(CS40);
TCCR4C = 0;
TCCR4D = 0;
TCCR4E = 0;
TC4H = (F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND) >> 8;
OCR4C = (F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND) & 255;
TC4H = 0;
TCNT4 = 0;
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(CORE_OC4A_PIN)
#define IR_SEND_PIN CORE_OC4A_PIN // Teensy 2.0
# elif defined(ARDUINO_AVR_PROMICRO)
#define IR_SEND_PIN 5 // Sparkfun Pro Micro
# elif defined(__AVR_ATmega32U4__)
#define IR_SEND_PIN 13 // Leonardo
# else
#error Please add OC4A pin number here
# endif
# if defined(ARDUINO_AVR_PROMICRO) // Sparkfun Pro Micro
void enableSendPWMByTimer() { TCNT4 = 0; (TCCR4A |= _BV(COM4A0)) // Use complementary OC4A output on pin 5
void disableSendPWMByTimer() { (TCCR4A &= ~(_BV(COM4A0))) // (Pro Micro does not map PC7 (32/ICP3/CLK0/OC4A)
// of ATmega32U4 )
# else
void enableSendPWMByTimer() {
TCNT4 = 0;
TCCR4A |= _BV(COM4A1);
DDRC |= 1 << 7;
}
void disableSendPWMByTimer() {
TCCR4A &= ~(_BV(COM4A1));
}
# endif
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
#if F_CPU > 16000000
#error "Creating timer PWM with timer 4 HS is not supported for F_CPU > 16 MHz"
#endif
timerDisableReceiveInterrupt();
const uint16_t tPWMWrapValue = ((F_CPU / 2000) / (aFrequencyKHz)) - 1; // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of Phase Correct PWM
TCCR4A = (1 << PWM4A);
TCCR4B = _BV(CS40);
TCCR4C = 0;
TCCR4D = (1 << WGM40);
TCCR4E = 0;
TC4H = tPWMWrapValue >> 8;
OCR4C = tPWMWrapValue;
TC4H = (tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT / 100) >> 8;
OCR4A = (tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT / 100) & 255;
TCNT4 = 0; // not really required, since we have an 8 bit counter, but makes the signal more reproducible
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer5 (16 bits)
*/
#elif defined(IR_USE_AVR_TIMER5)
void timerEnableReceiveInterrupt() {
TIMSK5 = _BV(OCIE5A);
}
void timerDisableReceiveInterrupt() {
TIMSK5 = 0;
}
#define TIMER_INTR_NAME TIMER5_COMPA_vect
void timerConfigForReceive() {
TCCR5A = 0;
TCCR5B = _BV(WGM52) | _BV(CS50);
OCR5A = F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND;
TCNT5 = 0;
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(CORE_OC5A_PIN)
#define IR_SEND_PIN CORE_OC5A_PIN
# elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define IR_SEND_PIN 46 // Arduino Mega
# else
#error Please add OC5A pin number here
# endif
void enableSendPWMByTimer() {
TCNT5 = 0;
TCCR5A |= _BV(COM5A1);
}
void disableSendPWMByTimer() {
TCCR5A &= ~(_BV(COM5A1));
}
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
#if F_CPU > 16000000
#error "Creating timer PWM with timer 5 is not supported for F_CPU > 16 MHz"
#endif
timerDisableReceiveInterrupt();
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz); // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of Phase Correct PWM
TCCR5A = _BV(WGM51);
TCCR5B = _BV(WGM53) | _BV(CS50);
ICR5 = tPWMWrapValue - 1;
OCR5A = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT5 = 0; // required, since we have an 16 bit counter
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer0 for ATtinies (8 bits)
*/
#elif defined(IR_USE_AVR_TIMER_TINY0)
void timerEnableReceiveInterrupt() {
TIMSK |= _BV(OCIE0A);
}
void timerDisableReceiveInterrupt() {
TIMSK &= ~(_BV(OCIE0A));
}
#define TIMER_INTR_NAME TIMER0_COMPA_vect
#define TIMER_COUNT_TOP (F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND)
void timerConfigForReceive() {
# if (TIMER_COUNT_TOP < 256)
TCCR0A = _BV(WGM01); // CTC, Top is OCR0A
TCCR0B = _BV(CS00);// No prescaling
OCR0A = TIMER_COUNT_TOP;
TCNT0 = 0;
# else
TCCR0A = _BV(WGM01);
TCCR0B = _BV(CS01); // prescaling by 8
OCR0A = TIMER_COUNT_TOP / 8;
TCNT0 = 0;
# endif
}
# if defined(SEND_PWM_BY_TIMER)
#define IR_SEND_PIN 1
void enableSendPWMByTimer() {
TCNT0 = 0;
TCCR0A |= _BV(COM0B1);
}
void disableSendPWMByTimer() {
TCCR0A &= ~(_BV(COM0B1));
}
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
#if F_CPU > 16000000
#error "Creating timer PWM with timer TINY0 is not supported for F_CPU > 16 MHz"
#endif
timerDisableReceiveInterrupt();
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz); // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of Phase Correct PWM
TCCR0A = _BV(WGM00); // PWM, Phase Correct, Top is OCR0A
TCCR0B = _BV(WGM02) | _BV(CS00); // CS00 -> no prescaling
OCR0A = tPWMWrapValue - 1;
OCR0B = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT0 = 0; // not really required, since we have an 8 bit counter, but makes the signal more reproducible
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR Timer1 for ATtinies (8 bits)
*/
#elif defined(IR_USE_AVR_TIMER_TINY1)
void timerEnableReceiveInterrupt() {
TIMSK |= _BV(OCIE1B);
}
void timerDisableReceiveInterrupt() {
TIMSK &= ~(_BV(OCIE1B));
}
#define TIMER_INTR_NAME TIMER1_COMPB_vect
#define TIMER_COUNT_TOP (F_CPU * MICROS_PER_TICK / MICROS_IN_ONE_SECOND)
void timerConfigForReceive() {
# if (TIMER_COUNT_TOP < 256)
TCCR1 = _BV(CTC1) | _BV(CS10); // Clear Timer/Counter on Compare Match, Top is OCR1C, No prescaling
GTCCR = 0;// normal, non-PWM mode
OCR1C = TIMER_COUNT_TOP;
TCNT1 = 0;
# else
TCCR1 = _BV(CTC1) | _BV(CS12); // Clear Timer/Counter on Compare Match, Top is OCR1C, prescaling by 8
GTCCR = 0; // normal, non-PWM mode
OCR1C = TIMER_COUNT_TOP / 8;
TCNT1 = 0;
# endif
}
# if defined(SEND_PWM_BY_TIMER)
#define IR_SEND_PIN 4
void enableSendPWMByTimer() {
TCNT1 = 0;
GTCCR |= _BV(PWM1B) | _BV(COM1B0); // Enable pin 4 PWM output (PB4 - Arduino D4)
}
void disableSendPWMByTimer() {
GTCCR &= ~(_BV(PWM1B) | _BV(COM1B0));
}
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
timerDisableReceiveInterrupt();
# if (((F_CPU / 1000) / 38) < 256)
const uint16_t tPWMWrapValue = (F_CPU / 1000) / (aFrequencyKHz); // 421 @16 MHz, 26 @1 MHz and 38 kHz
TCCR1 = _BV(CTC1) | _BV(CS10);// CTC1 = 1: TOP value set to OCR1C, CS10 No Prescaling
OCR1C = tPWMWrapValue - 1;
OCR1B = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT1 = 0;// not really required, since we have an 8 bit counter, but makes the signal more reproducible
GTCCR = _BV(PWM1B) | _BV(COM1B0);// PWM1B = 1: Enable PWM for OCR1B, COM1B0 Clear on compare match
# else
const uint16_t tPWMWrapValue = ((F_CPU / 2) / 1000) / (aFrequencyKHz); // 210 for 16 MHz and 38 kHz
TCCR1 = _BV(CTC1) | _BV(CS11); // CTC1 = 1: TOP value set to OCR1C, CS11 Prescaling by 2
OCR1C = tPWMWrapValue - 1;
OCR1B = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1;
TCNT1 = 0; // not really required, since we have an 8 bit counter, but makes the signal more reproducible
GTCCR = _BV(PWM1B) | _BV(COM1B0); // PWM1B = 1: Enable PWM for OCR1B, COM1B0 Clear on compare match
# endif
}
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR TimerA for TinyCore 32 (16 bits)
*/
#elif defined(IR_USE_AVR_TIMER_A)
#define TIMER_REQUIRES_RESET_INTR_PENDING
void timerResetInterruptPending() {
TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm;
}
void timerEnableReceiveInterrupt() {
TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm;
}
void timerDisableReceiveInterrupt() {
TCA0.SINGLE.INTCTRL &= ~(TCA_SINGLE_OVF_bm);
}
#define TIMER_INTR_NAME TCA0_OVF_vect
// For MegaTinyCore:
// TCB1 is used by Tone()
// TCB2 is used by Servo, but we cannot hijack the ISR, so we must use a dedicated timer for the 20 ms interrupt
// TCB3 is used by millis()
// Must use TCA0, since TCBx have only prescaler %2. Use single (16bit) mode, because it seems to be easier :-)
void timerConfigForReceive() {
TCA0.SINGLE.CTRLD = 0; // Single mode - required at least for MegaTinyCore
TCA0.SINGLE.CTRLB = TCA_SINGLE_WGMODE_NORMAL_gc; // Normal mode, top = PER
TCA0.SINGLE.PER = (F_CPU / MICROS_IN_ONE_SECOND) * MICROS_PER_TICK; // 800 at 16 MHz
TCA0.SINGLE.CTRLA = TCA_SINGLE_CLKSEL_DIV1_gc | TCA_SINGLE_ENABLE_bm; // set prescaler to 1 and enable timer
}
# if defined(SEND_PWM_BY_TIMER)
#error "No support for hardware PWM generation for ATtiny3216/17 etc."
# endif // defined(SEND_PWM_BY_TIMER)
/*
* AVR TimerB (8 bits) for ATmega4809 (Nano Every, Uno WiFi Rev2)
*/
#elif defined(IR_USE_AVR_TIMER_B)
// ATmega4809 TCB0
#define TIMER_REQUIRES_RESET_INTR_PENDING
void timerResetInterruptPending() {
TCB0.INTFLAGS = TCB_CAPT_bm;
}
void timerEnableReceiveInterrupt() {
TCB0.INTCTRL = TCB_CAPT_bm;
}
void timerDisableReceiveInterrupt() {
TCB0.INTCTRL &= ~(TCB_CAPT_bm);
}
#define TIMER_INTR_NAME TCB0_INT_vect
void timerConfigForReceive() {
TCB0.CTRLB = (TCB_CNTMODE_INT_gc); // Periodic interrupt mode
TCB0.CCMP = ((F_CPU * MICROS_PER_TICK) / MICROS_IN_ONE_SECOND);
TCB0.INTFLAGS = TCB_CAPT_bm; // reset interrupt flags
TCB0.CTRLA = (TCB_CLKSEL_CLKDIV1_gc) | (TCB_ENABLE_bm);
}
# if defined(SEND_PWM_BY_TIMER)
# if defined(__AVR_ATmega4808__) || defined(__AVR_ATmega4809__)
#define IR_SEND_PIN 6 // PF4 on ATmega4809 / Nano Every (see pins_arduino.h digital_pin_to_timer)
# else
#error SEND_PWM_BY_TIMER not yet supported for this CPU
# endif
void enableSendPWMByTimer() {
TCB0.CNT = 0;
TCB0.CTRLB |= TCB_CCMPEN_bm; // set Compare/Capture Output Enable
}
void disableSendPWMByTimer() {
TCB0.CTRLB &= ~(TCB_CCMPEN_bm);
}
/*
* timerConfigForSend() is used exclusively by IRsend::enableIROut()
* Set output pin mode and disable receive interrupt if it uses the same resource
*/
void timerConfigForSend(uint16_t aFrequencyKHz) {
#if F_CPU > 16000000
// we have only prescaler 2 or must take clock of timer A (which is non deterministic)
#error "Creating timer PWM with timer TCB0 is not possible for F_CPU > 16 MHz"
#endif
timerDisableReceiveInterrupt();
const uint16_t tPWMWrapValue = (F_CPU / 2000) / (aFrequencyKHz); // 210,52 for 38 kHz @16 MHz clock, 2000 instead of 1000 because of using CLK / 2
TCB0.CTRLB = TCB_CNTMODE_PWM8_gc; // 8 bit PWM mode
TCB0.CCMPL = tPWMWrapValue - 1; // Period of 8 bit PWM
TCB0.CCMPH = ((tPWMWrapValue * IR_SEND_DUTY_CYCLE_PERCENT) / 100) - 1; // Duty cycle of waveform of 8 bit PWM
TCB0.CTRLA = (TCB_CLKSEL_CLKDIV2_gc) | (TCB_ENABLE_bm); // use CLK / 2