Manual

www.nexusrobot.com Robot Kits manual

¾ Pin Change Interrupt

¾ PinChangeInt Library

This library was inspired by and derived from the PcInt example by "johnboiles", and written by a

"jbrisbin" (it seems).

While the PCInt example shows with generality how Pin Change interrupts can be done under Arduino, it

is an 'example' effort that sacrifices performance for clarity of implementation.

The PinChangeInt effort runs in the other direction, with clarity sacrificed for the highest performance. To

that end, this implementation can handle a 4.5KHz input signal (with a 1 KHz timer running as well) on an

8 MHzATMega328, with significant code in both the timer and pin change interrupt handlers.

Usage

The PinChangeInt library exposes two functions to to the user and provides macros that make it drop-in

compatible with the PcInt code.

To attach an interrupt use

PCintPort::attachInterrupt(pin, userFunc, mode)

PCattachInterrupt(pin,userFunc,mode)

To detach an interrupt use

PCintPort::detachInterrupt(pin)

PCdetachInterrupt(pin)

See: http://arduino.cc/playground/Main/PinChangeInt

¾ The Code

PinChangeIntConfig.h

See: http://arduino.cc/playground/Main/PinChangeInt

PinChangeInt.h

See : http://arduino.cc/playground/Main/PinChangeInt

PinChangeInt Example

This code counts the number of times pin 15 (aka Analog 1) changes state and prints the count when it

recives a p on the serial port.

1. /*

3. 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.

4. */

5. #include <PinChangeInt.h>

6. #include <PinChangeIntConfig.h>