PS2Keyboard.h
/*
PS2Keyboard.h - PS2Keyboard library
Copyright (c) 2007 Free Software Foundation. All right reserved.
Written by Christian Weichel <info@32leaves.net>
** Modified for use with Arduino 13 by L. Abraham Smith, <n3bah@microcompdesign.com> *
** Modified to include: shift, alt, caps_lock and caps_lock light by Bill Oldfield *
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 2.1 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
*/
#ifndef PS2Keyboard_h
#define PS2Keyboard_h
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
/*
* PS2 keyboard "make" codes to check for certain keys.
*/
// Give these codes that aren't used by anything else
// Making all the control key codes above 0x80 makes it simple to check for
// printable characters at the calling level.
#define PS2_KC_BKSP 0x80
#define PS2_KC_UP 0x81
#define PS2_KC_DOWN 0x82
#define PS2_KC_LEFT 0x83
#define PS2_KC_RIGHT 0x84
#define PS2_KC_PGDN 0x85
#define PS2_KC_PGUP 0x86
#define PS2_KC_END 0x87
#define PS2_KC_HOME 0x88
#define PS2_KC_INS 0x89
#define PS2_KC_DEL 0x8A
#define PS2_KC_ESC 0x8B
#define PS2_KC_CLON 0x8C // caps_lock on
#define PS2_KC_CLOFF 0x8D // caps_lock off
#include "binary.h"
typedef uint8_t boolean;
typedef uint8_t byte;
/*
* This PIN is hardcoded in the init routine later on. If you change this
* make sure you change the interrupt initialization as well.
*/
#define PS2_INT_PIN 3
/**
* Purpose: Provides an easy access to PS2 keyboards
* Author: Christian Weichel
*/
class PS2Keyboard {
private:
int m_dataPin;
byte m_charBuffer;
public:
/**
* This constructor does basically nothing. Please call the begin(int)
* method before using any other method of this class.
*/
PS2Keyboard();
/**
* Starts the keyboard "service" by registering the external interrupt.
* setting the pin modes correctly and driving those needed to high.
* The propably best place to call this method is in the setup routine.
*/
void begin(int dataPin);
/**
* Returns true if there is a char to be read, false if not.
*/
bool available();
/**
* Sends a reset command to the keyboard and re-initialises all the control
* variables within the PS2Keybaord code.
*/
void reset();
/**
* Returns the char last read from the keyboard. If the user has pressed two
* keys between calls to this method, only the later one will be availble. Once
* the char has been read, the buffer will be cleared.
* If there is no char availble, 0 is returned.
*/
byte read();
/**
* Returns the status of the <ctrl> key, the <alt> key, the <shift> key and the
* caps_lock state. Note that shift and caps_lock are handled within the
* Ps2Keyboard code (and the return value from read() is already modified), but
* being able to read them here may be useful.
* This routine is optional BUT MUST ONLY be read after available() has returned
* true and BEFORE read() is called to retrieve the character. Reading it after
* the call to read() will return unpredictable values.
*/
byte read_extra();
};
#endif