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v1.5.0 to fix multiple-definitions linker error
### Releases v1.5.0 1. Fix `multiple-definitions` linker error. Drop `src_cpp` and `src_h` directories 2. Avoid deprecated functions. 3. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project. 4. Optimize library code by using `reference-passing` instead of `value-passing` 5. Update all examples
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‎CONTRIBUTING.md‎

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Please ensure to specify the following:
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* Arduino IDE version (e.g. 1.8.15) or Platform.io version
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* `ESP32` Core Version (e.g. ESP32 core v1.0.6)
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* Arduino IDE version (e.g. 1.8.19) or Platform.io version
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* `ESP32` Core Version (e.g. ESP32 core v2.0.2)
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* `ESP32-S2` Board type (e.g. ESP32S2_DEV Module, ESP32_S2_Saola, etc.)
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* Contextual information (e.g. what you were trying to achieve)
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* Simplest possible steps to reproduce
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### Example
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```
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Arduino IDE version: 1.8.15
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ESP32 Core Version 1.0.6
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Arduino IDE version: 1.8.19
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ESP32 Core Version 2.0.2
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ESP32S2_DEV Module
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OS: Ubuntu 20.04 LTS
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Linux xy-Inspiron-3593 5.4.0-73-generic #82-Ubuntu SMP Wed Apr 14 17:39:42 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
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Linux xy-Inspiron-3593 5.4.0-96-generic #109-Ubuntu SMP Wed Jan 12 16:49:16 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
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Context:
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I encountered a crash while using TimerInterrupt.

‎README.md‎

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‎changelog.md‎

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# ESP32_S2_TimerInterrupt Library
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[![arduino-library-badge](https://www.ardu-badge.com/badge/ESP32_S2_TimerInterrupt.svg?)](https://www.ardu-badge.com/ESP32_S2_TimerInterrupt)
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[![GitHub release](https://img.shields.io/github/release/khoih-prog/ESP32_S2_TimerInterrupt.svg)](https://github.com/khoih-prog/ESP32_S2_TimerInterrupt/releases)
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[![GitHub](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/khoih-prog/ESP32_S2_TimerInterrupt/blob/master/LICENSE)
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[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#Contributing)
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[![GitHub issues](https://img.shields.io/github/issues/khoih-prog/ESP32_S2_TimerInterrupt.svg)](http://github.com/khoih-prog/ESP32_S2_TimerInterrupt/issues)
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---
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---
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## Table of Contents
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* [Changelog](#changelog)
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* [Releases v1.5.0](#releases-v150)
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* [Releases v1.4.0](#releases-v140)
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* [Releases v1.3.0](#releases-v130)
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---
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---
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## Changelog
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### Releases v1.5.0
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1. Fix `multiple-definitions` linker error. Drop `src_cpp` and `src_h` directories
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2. Avoid deprecated functions.
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3. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project.
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4. Optimize library code by using `reference-passing` instead of `value-passing`
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5. Update all examples
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### Releases v1.4.0
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1. Fix compiler errors due to conflict to some libraries.
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2. Add complex examples.
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### Releases v1.3.0
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1. Initial coding to support ESP32-S2
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2. Sync with [ESP32TimerInterrupt library v1.3.0](https://github.com/khoih-prog/ESP32TimerInterrupt)
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‎examples/Argument_None/Argument_None.ino‎

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The accuracy is nearly perfect compared to software timers. The most important feature is they're ISR-based timers
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Therefore, their executions are not blocked by bad-behaving functions / tasks.
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This important feature is absolutely necessary for mission-critical tasks.
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Based on SimpleTimer - A timer library for Arduino.
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Author: mromani@ottotecnica.com
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Copyright (c) 2010 OTTOTECNICA Italy
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Based on BlynkTimer.h
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Author: Volodymyr Shymanskyy
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Version: 1.4.0
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Version Modified By Date Comments
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------- ----------- ---------- -----------
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1.3.0 K Hoang 06/05/2019 Initial coding. Sync with ESP32TimerInterrupt v1.3.0
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1.4.0 K.Hoang 01/06/2021 Add complex examples. Fix compiler errors due to conflict to some libraries.
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*****************************************************************************************************************************/
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/*
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// These define's must be placed at the beginning before #include "TimerInterrupt_Generic.h"
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// _TIMERINTERRUPT_LOGLEVEL_ from 0 to 4
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// Don't define _TIMERINTERRUPT_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
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#define TIMER_INTERRUPT_DEBUG 1
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#define TIMER_INTERRUPT_DEBUG 0
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#define _TIMERINTERRUPT_LOGLEVEL_ 4
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#include "ESP32_S2_TimerInterrupt.h"
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#ifndef LED_BUILTIN
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#define LED_BUILTIN 2 // Pin D2 mapped to pin GPIO2/ADC12 of ESP32, control on-board LED
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#define LED_BUILTIN 2 // Pin D2 mapped to pin GPIO2/ADC12 of ESP32, control on-board LED
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#endif
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#define PIN_D1 1 // Pin D1 mapped to pin GPIO1 of ESP32-S2
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void IRAM_ATTR TimerHandler0(void * timerNo)
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{
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 before processing ISR
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TIMER_ISR_START(timerNo);
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/////////////////////////////////////////////////////////
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bool IRAM_ATTR TimerHandler0(void * timerNo)
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{
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static bool toggle0 = false;
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static bool started = false;
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#if (TIMER_INTERRUPT_DEBUG > 0)
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Serial.print("ITimer0: millis() = "); Serial.println(millis());
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#endif
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//timer interrupt toggles pin LED_BUILTIN
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digitalWrite(LED_BUILTIN, toggle0);
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toggle0 = !toggle0;
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 after processing ISR
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TIMER_ISR_END(timerNo);
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/////////////////////////////////////////////////////////
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return true;
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}
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void IRAM_ATTR TimerHandler1(void * timerNo)
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bool IRAM_ATTR TimerHandler1(void * timerNo)
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{
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 before processing ISR
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TIMER_ISR_START(timerNo);
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/////////////////////////////////////////////////////////
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static bool toggle1 = false;
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static bool started = false;
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#if (TIMER_INTERRUPT_DEBUG > 0)
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Serial.print("ITimer1: millis() = "); Serial.println(millis());
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#endif
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//timer interrupt toggles outputPin
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digitalWrite(PIN_D1, toggle1);
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toggle1 = !toggle1;
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 after processing ISR
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TIMER_ISR_END(timerNo);
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/////////////////////////////////////////////////////////
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return true;
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}
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#define TIMER0_INTERVAL_MS 1000

‎examples/Change_Interval/Change_Interval.ino‎

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The accuracy is nearly perfect compared to software timers. The most important feature is they're ISR-based timers
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Therefore, their executions are not blocked by bad-behaving functions / tasks.
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This important feature is absolutely necessary for mission-critical tasks.
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Based on SimpleTimer - A timer library for Arduino.
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Author: mromani@ottotecnica.com
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Copyright (c) 2010 OTTOTECNICA Italy
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Based on BlynkTimer.h
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Author: Volodymyr Shymanskyy
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Version: 1.4.0
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Version Modified By Date Comments
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------- ----------- ---------- -----------
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1.3.0 K Hoang 06/05/2019 Initial coding. Sync with ESP32TimerInterrupt v1.3.0
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1.4.0 K.Hoang 01/06/2021 Add complex examples. Fix compiler errors due to conflict to some libraries.
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*****************************************************************************************************************************/
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/*
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// These define's must be placed at the beginning before #include "TimerInterrupt_Generic.h"
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// _TIMERINTERRUPT_LOGLEVEL_ from 0 to 4
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// Don't define _TIMERINTERRUPT_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
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#define TIMER_INTERRUPT_DEBUG 1
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#define TIMER_INTERRUPT_DEBUG 0
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#define _TIMERINTERRUPT_LOGLEVEL_ 4
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#include "ESP32_S2_TimerInterrupt.h"
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volatile uint32_t Timer0Count = 0;
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volatile uint32_t Timer1Count = 0;
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void IRAM_ATTR TimerHandler0(void * timerNo)
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{
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 before processing ISR
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TIMER_ISR_START(timerNo);
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/////////////////////////////////////////////////////////
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bool IRAM_ATTR TimerHandler0(void * timerNo)
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{
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static bool toggle0 = false;
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// Flag for checking to be sure ISR is working as Serial.print is not OK here in ISR
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Timer0Count++;
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#if (TIMER_INTERRUPT_DEBUG > 0)
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Serial.print("ITimer0: millis() = "); Serial.println(millis());
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#endif
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//timer interrupt toggles pin LED_BUILTIN
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digitalWrite(LED_BUILTIN, toggle0);
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toggle0 = !toggle0;
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 after processing ISR
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TIMER_ISR_END(timerNo);
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/////////////////////////////////////////////////////////
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return true;
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}
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void IRAM_ATTR TimerHandler1(void * timerNo)
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bool IRAM_ATTR TimerHandler1(void * timerNo)
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{
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 before processing ISR
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TIMER_ISR_START(timerNo);
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/////////////////////////////////////////////////////////
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static bool toggle1 = false;
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// Flag for checking to be sure ISR is working as Serial.print is not OK here in ISR
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Timer1Count++;
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#if (TIMER_INTERRUPT_DEBUG > 0)
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Serial.print("ITimer1: millis() = "); Serial.println(millis());
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#endif
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//timer interrupt toggles PIN_D1
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digitalWrite(PIN_D1, toggle1);
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toggle1 = !toggle1;
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/////////////////////////////////////////////////////////
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// Always call this for ESP32-S2 after processing ISR
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TIMER_ISR_END(timerNo);
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/////////////////////////////////////////////////////////
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return true;
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}
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void printResult(uint32_t currTime)

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