HW_Timer

An Arduino library wrapping the use of the 4 ESP32 HW timers into easy to use function calls.

Why did I create this library
When I started to program on the ESP32 there was no Ticker library available as I was used to from ESP8266 and Arduino. So I decided to write some code that makes it easy for me to use the ESP32's hardware timers.

This library is only on for the ESP32.

Change Log:

• 2018-04-22: Created from some code stubs that I used before
  Features

• Easy use of the 4 HW timers
• Keeps track which of the timers are already in use
• User defined callbacks

Functions

hw_timer_t *startTimer (uint64_t usTriggerTime, callback_t callback, bool repeat);
- Allocate and start a timer
- Return NULL if no timer is available, calling code must check the return value - usTriggerTime - time for timer in micro seconds
- callback - pointer to the users callback function
- repeat - true for a repeating timer, false for a single shot timer
- RETURN - hw_timer_t* to the timer (required to stop or repeat the timer) or NULL if no timer was available

hw_timer_t *startTimerMsec (uint64_t msTriggerTime, callback_t callback, bool repeat);
- Allocate and start a timer
- Return NULL if no timer is available, calling code must check the return value - msTriggerTime - time for timer in milli seconds
- callback - pointer to the users callback function
- repeat - true for a repeating timer, false for a single shot timer
- RETURN - hw_timer_t* to the timer (required to stop or repeat the timer) or NULL if no timer was available

hw_timer_t *startTimerSec (uint64_t sTriggerTime, callback_t callback, bool repeat);
- Allocate and start a timer
- Return NULL if no timer is available, calling code must check the return value - sTriggerTime - time for timer in seconds
- callback - pointer to the users callback function
- repeat - true for a repeating timer, false for a single shot timer
- RETURN - hw_timer_t* to the timer (required to stop or repeat the timer) or NULL if no timer was available

void restartTimer(hw_timer_t *timerToRestart);
- Reset a repeating timer and start it again - Restart a single-shot timer - timerToRestart - pointer to timer returned from startTimer()

void stopTimer(hw_timer_t *timerToStop);
- Stop a running timer
- timerToRestart - pointer to timer returned from startTimer()

void stopAllTimers();
- Stops all running timers

Usage

See examples. For more information checkout Using the HW timers of the ESP32.

Installation

Copy hw_timer.h and hw_timer.cpp into your project folder
Include hw_timer.h into your sketch