/*
  flowmeter.cpp - Flowmeter control library for Arduino - Version 1
  Copyright (c) 2016 Franco (nextime) Lanza.  All right reserved.

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

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "../../base.h"
#include <Arduino.h>


#if ENABLED(FLOWMETER_SENSOR)

volatile int flowrate_pulsecount;  
float flowrate;
static millis_t flowmeter_timer = 0;
static millis_t lastflow = 0;
void flowrate_pulsecounter();

void flow_init() {

   flowrate = 0;
   flowrate_pulsecount = 0;
   pinMode(FLOWMETER_PIN, INPUT);
   
   attachInterrupt(digitalPinToInterrupt(FLOWMETER_PIN), flowrate_pulsecounter, FALLING);
}

void flowrate_manage() {
   millis_t  now;
   now = millis();
   if(ELAPSED(now, flowmeter_timer)) {
      detachInterrupt(digitalPinToInterrupt(FLOWMETER_PIN));
      flowrate  = (float)(((1000.0 / (float)((float)now - (float)lastflow)) * (float)flowrate_pulsecount) / (float)FLOWMETER_CALIBRATION);
      #if ENABLED(FLOWMETER_DEBUG)
         ECHO_M(" FLOWMETER DEBUG ");
         ECHO_MV(" flowrate:", flowrate);
         ECHO_MV(" flowrate_pulsecount:", flowrate_pulsecount);
         ECHO_MV(" CALIBRATION:", FLOWMETER_CALIBRATION);
         ECHO_E;
      #endif
      flowmeter_timer = now + 1000UL;
      lastflow = now;
      flowrate_pulsecount = 0;
      attachInterrupt(digitalPinToInterrupt(FLOWMETER_PIN), flowrate_pulsecounter, FALLING);

   }

}

float get_flowrate() {
   return flowrate;
}

void flowrate_pulsecounter()
{
  // Increment the pulse counter
  flowrate_pulsecount++;
}

#endif // FLOWMETER_SENSOR

