File content as of revision 0:1136d6d5aa1c:

/*
    Copyright (c) 2011 Pro-Serv
 
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
 
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
 
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
    
    Usage and assumptions:
        the digital joystick device is directly attached to the used pins as per
        function call, common contact to ground, using the internal pull-up's
        but one can use external pull-up's too or even a small capaitor if device
        shows signs of contact bounce.
        
    Operation modes:
        By default it's using dynamic mode which means that the main program may
        not see the expected pressed joystick contact in it's scan loop as another
        joystick contact may already be active.
        Using the static mode will capture the first joystick contact untill it's
        been read by the getJoyValue function
        
    To do:
        Adding a callable service routine to be used by the main program loop
 */

#ifndef MBED_H
#include "mbed.h"
#endif

#ifndef JOY_DELAY_PERIOD
#define JOY_DELAY_PERIOD 5000
#endif

#ifndef JOY_STATIC
#define JOY_STATIC 0
#endif

#ifndef JOY_CENTER
#define JOY_CENTER 1
#endif

#ifndef JOY_RIGHT
#define JOY_RIGHT 2
#endif

#ifndef JOY_DOWN
#define JOY_DOWN 4
#endif

#ifndef JOY_LEFT
#define JOY_LEFT 8
#endif

#ifndef JOY_UP
#define JOY_UP 16
#endif

namespace JOY {

 
class JoyRead {

protected:
    InterruptIn *_int0;
    InterruptIn *_int1;
    InterruptIn *_int2;
    InterruptIn *_int3;
    InterruptIn *_int4;
    int         _sampleDelay;
    int         _staticMode;
    int         _joy_status;
    
    void init(PinName px0, PinName px1, PinName px2, PinName px3, PinName px4, PinMode m) {
        _sampleDelay             = JOY_DELAY_PERIOD;
        _staticMode              = JOY_STATIC;
        _joy_status = 0;
        _int0 = new InterruptIn( px0 ); 
        _int1 = new InterruptIn( px1 ); 
        _int2 = new InterruptIn( px2 ); 
        _int3 = new InterruptIn( px3 ); 
        _int4 = new InterruptIn( px4 ); 
        _int0->mode( m );
        _int1->mode( m );
        _int2->mode( m );
        _int3->mode( m );
        _int4->mode( m );
        _int0->fall(this, &JoyRead::isr_int0_f);
        _int1->fall(this, &JoyRead::isr_int1_f);
        _int2->fall(this, &JoyRead::isr_int2_f);
        _int3->fall(this, &JoyRead::isr_int3_f);
        _int4->fall(this, &JoyRead::isr_int4_f);
        _int0->rise(this, &JoyRead::isr_int0_r);
        _int1->rise(this, &JoyRead::isr_int1_r);
        _int2->rise(this, &JoyRead::isr_int2_r);
        _int3->rise(this, &JoyRead::isr_int3_r);
        _int4->rise(this, &JoyRead::isr_int4_r);
    }

public:

    /* PinDetect constructor(s) & overloading */
    JoyRead() { error("Provide a valid PinName"); }

    JoyRead(PinName px0, PinName px1, PinName px2, PinName px3, PinName px4) {
        init( px0, px1, px2, px3, px4, PullUp);
    }

    JoyRead(PinName px0, PinName px1, PinName px2, PinName px3, PinName px4, PinMode m) {
        init(  px0, px1, px2, px3, px4, m );
    }

    /* Set the sampling delay time in microseconds. */
    void setDelaySample(int i = JOY_DELAY_PERIOD) { _sampleDelay = i; }
    
    /* Set the sampling delay time in microseconds. */
    void setJoyStatic(int i = JOY_STATIC) { _staticMode = i; }
    
    /* Returns true if any joystick position is active */
    bool getJoyStatus(void) {
        if ((_joy_status & 0x80) == 0x80) {
            return true;
        } else {
            return false;
        }
    }
    
    /* Return true if selected joystick key is active */
    bool getJoyKey(int i) {
        if ((_joy_status & 0x1f) == i) {
            return true;
        } else {
            return false;
        }
    }
    
    /* Return value of all key's active state (may result in upto 3 keys at same time) */
    int getJoyValue(void) {
        int tmp;
        if ((_joy_status & 0x80) == 0x80) {
            /* in _stiticMode = 1 the getJoyValue will reset joy available */
            tmp = _joy_status & 0x1f;
            if (_staticMode == 1) { _joy_status = 0x00;}
            return tmp;
        } else {
            return 0x00;
        }
    }
    
protected:    
    /* The interrupt service routines are: fall and rise */
    void isr_int0_f(void) {
        _joy_status |= 0x81;
    }
    void isr_int1_f(void) {
        _joy_status |= 0x82;
    }
    void isr_int2_f(void) {
        _joy_status |= 0x84;
    }
    void isr_int3_f(void) {
        _joy_status |= 0x88;
    }
    void isr_int4_f(void) {
        _joy_status |= 0x90;
    }
    /* The interrupt service routine for rise is only actively used in case of _staticMode = 0 */
    void isr_int0_r(void) {
        if (_staticMode == 0) {
            _joy_status &= 0x9e;
            if ((_joy_status & 0x1f) == 0x00) {_joy_status = 0x00;}
        }
    }
    void isr_int1_r(void) {
        if (_staticMode == 0) {
            _joy_status &= 0x9d;
            if ((_joy_status & 0x1f) == 0x00) {_joy_status = 0x00;}
        }
    }
    void isr_int2_r(void) {
        if (_staticMode == 0) {
            _joy_status &= 0x9b;
            if ((_joy_status & 0x1f) == 0x00) {_joy_status = 0x00;}
        }
    }
    void isr_int3_r(void) {
        if (_staticMode == 0) {
            _joy_status &= 0x97;
            if ((_joy_status & 0x1f) == 0x00) {_joy_status = 0x00;}
        }
    }
    void isr_int4_r(void) {
        if (_staticMode == 0) {
            _joy_status &= 0x8f;
            if ((_joy_status & 0x1f) == 0x00) {_joy_status = 0x00;}
        }
    }
};

}; // namespace JOY ends.

using namespace JOY;