Chuck Timber / button

button procedure library

Dependents:   MIDI_CW Gemphet8

button.cpp

Committer:
ChuckTimber
Date:
2014-07-13
Revision:
0:f57033bb0e05
Child:
1:20c8438edaee

File content as of revision 0:f57033bb0e05:

#include "button.h"
#include "mbed.h"

/** class to make sound with a buzzer, based on a PwmOut
 *   The class use a timeout to switch off the sound  - it is not blocking while making noise
 *
 * Example:
 * @code
 * @endcode
 */

using namespace mbed;
 // constructor
 /** Create a Beep object connected to the specified PwmOut pin
  *
  * @param pin PwmOut pin to connect to 
  */

void BTN::sample_btn()
{
    unsigned char a, b;

    a = _Pin;
    
    if (a == FIL) {
        b = STAT;
        STAT = a;
        b = (b ^ a) & a;
        if (b) CMD = b;
    }
    FIL = a;
}

BTN::BTN(PinName pin) : _Pin(pin) {
    CMD = STAT = FIL = 0;
    _Tick.attach(this, &BTN::sample_btn, 0.01);
}