Revision 0:471239ea932b, committed 2014-02-22

Comitter:

togayan

Date:

Sat Feb 22 23:55:10 2014 +0000

Commit message:

1st release.

Changed in this revision

diff -r 000000000000 -r 471239ea932b DebouncedEdgeIn.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedEdgeIn.cpp	Sat Feb 22 23:55:10 2014 +0000
@@ -0,0 +1,78 @@
+#include "DebouncedEdgeIn.h"
+#include "mbed.h"
+
+/*
+ * Constructor
+ */
+DebouncedEdgeIn::DebouncedEdgeIn(PinName in)
+    : _in(in),
+      _ticker(),
+      _rise(),
+      _fall(),
+      // reset all the flags and counters
+      _samples(0),
+      _output(0),
+      _output_last(0)
+{
+    // Attach ticker
+    _ticker.attach(this, &DebouncedEdgeIn::_sample, 0.005);
+}
+
+DebouncedEdgeIn::~DebouncedEdgeIn() {
+    _ticker.detach();
+}
+
+void DebouncedEdgeIn::rise(void (*fptr)(void))
+{
+    _rise.attach(fptr);
+}
+
+void DebouncedEdgeIn::fall(void (*fptr)(void))
+{
+    _fall.attach(fptr);
+}
+
+void DebouncedEdgeIn::mode(PinMode pull) {
+    _in.mode(pull);
+}
+
+// return the debounced status
+int DebouncedEdgeIn::read(void)
+{
+    return(_output);
+}
+
+// shorthand for read()
+DebouncedEdgeIn::operator int()
+{
+    return read();
+}
+
+void DebouncedEdgeIn::_sample(void)
+{
+    // take a sample
+    _samples = _samples >> 1; // shift left
+
+    if (_in) {
+        _samples |= 0x80;
+    }
+
+    // examine the sample window, look for steady state
+    if (_samples == 0x00) {
+        _output = 0;
+    } else if (_samples == 0xFF) {
+        _output = 1;
+    }
+
+    // Rising edge detection
+    if ((_output == 1) && (_output_last == 0)) {
+        _rise.call();
+    }
+    // Falling edge detection
+    else if ((_output == 0) && (_output_last == 1)) {
+        _fall.call();
+    }
+
+    // update the output
+    _output_last = _output;
+}

diff -r 000000000000 -r 471239ea932b DebouncedEdgeIn.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedEdgeIn.h	Sat Feb 22 23:55:10 2014 +0000
@@ -0,0 +1,70 @@
+#ifndef DEBAUNCED_EDGE_IN_H
+#define DEBAUNCED_EDGE_IN_H
+
+#include "mbed.h"
+#include "FunctionPointer.h"
+
+class DebouncedEdgeIn
+{
+public:
+    DebouncedEdgeIn(PinName in);
+    virtual ~DebouncedEdgeIn();
+
+    int read (void);
+    operator int();
+
+    /** Attach a function to call when a rising edge occurs on the input
+     *
+     *  @param fptr A pointer to a void function, or 0 to set as none
+     */
+    void rise(void (*fptr)(void));
+
+    /** Attach a member function to call when a rising edge occurs on the input
+     *
+     *  @param tptr pointer to the object to call the member function on
+     *  @param mptr pointer to the member function to be called
+     */
+    template<typename T>
+    void rise(T* tptr, void (T::*mptr)(void)) {
+        _rise.attach(tptr, mptr);
+    }
+
+    /** Attach a function to call when a falling edge occurs on the input
+     *
+     *  @param fptr A pointer to a void function, or 0 to set as none
+     */
+    void fall(void (*fptr)(void));
+
+    /** Attach a member function to call when a falling edge occurs on the input
+     *
+     *  @param tptr pointer to the object to call the member function on
+     *  @param mptr pointer to the member function to be called
+     */
+    template<typename T>
+    void fall(T* tptr, void (T::*mptr)(void)) {
+        _fall.attach(tptr, mptr);
+    }
+
+    /** Set the input pin mode
+     *
+     *  @param mode PullUp, PullDown, PullNone
+     */
+    void mode(PinMode pull);
+    
+private :
+    // objects
+    DigitalIn _in;
+    Ticker _ticker;
+    FunctionPointer _rise;
+    FunctionPointer _fall;
+
+    // function to take a sample, and update flags
+    void _sample(void);
+
+    // counters and flags
+    int _samples;
+    int _output;
+    int _output_last;
+};
+
+#endif // DEBAUNCED_EDGE_IN_H