Ticker-ESP32.h

/*
    Ticker
    Copyright (C) 2017  Pedro Albuquerque

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

 //
 // This lib mimics the Ticker library from ESP8266 package to make code compatible with ESP32
 // for this library to work properly it should be installed in ESP32 package folder
 //  assuming ESP32 package has been installed a folder named Projects/hardware/espressif/esp32 should exist
 // and a subfolder named Ticker must be created there
 // it will only be available when ESP32 board is selected, but unavailable for other boards
 //
 // This implementation of Ticker, makes use of timer 0 so any other need in your sketch should avoid timer 0
 // and use any other available timer


#ifndef TICKER_H
#define TICKER_H

class Ticker {
public:
  hw_timer_t * timer = NULL;
  void attach(unsigned milis, void  func());
};


void Ticker::attach(unsigned milis, void  func())
{
  // Use 1st timer of 4 (counted from zero).
  // Set 80 divider for prescaler (see ESP32 Technical Reference Manual for more
  // info).
  timer = timerBegin(0, 80, true);

  // Attach onTimer function to our timer.
  timerAttachInterrupt(timer, func, true);

  // Set alarm to call onTimer function every second (value in microseconds).
  // Repeat the alarm (third parameter)
  timerAlarmWrite(timer, milis, true);

  // Start an alarm
  timerAlarmEnable(timer);
}




#endif