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InterruptCounter.cpp
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InterruptCounter.cpp
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/*
Simple library for Arduino implementing a counter using the interrupt pin
for a Geigier counter for example
Copyright (c) 2011, Robin Scheibler aka FakuFaku
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the <organization> nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "InterruptCounter.h"
#include <limits.h>
// Declare variables here
int _interrupt_pin;
unsigned long _start_time;
unsigned long _delay;
unsigned long _count;
// private methods here
void interrupt_routine();
// Constructor
void interruptCounterSetup(int interrupt_pin, unsigned long delay)
{
_interrupt_pin = interrupt_pin;
_delay = delay;
_count = 0;
attachInterrupt(_interrupt_pin, interrupt_routine, RISING);
}
// call this to start the counter
void interruptCounterReset()
{
// set start time
_start_time = millis();
// set count to zero (optional)
_count = 0;
}
// This indicates when the count over the determined period is over
int interruptCounterAvailable()
{
// get current time
unsigned long now = millis();
// do basic check for millis overflow
if (now >= _start_time)
return (now - _start_time >= _delay);
else
return (ULONG_MAX + now - _start_time >= _delay);
}
// return current number of counts
unsigned long interruptCounterCount()
{
return _count;
}
// The interrupt routine, simply increment count on every event
void interrupt_routine()
{
_count++;
}