libreria para el manejo de entradas

Dependents:   Prueba_Ascensor Ascensor NewAscensor

Files at this revision

API Documentation at this revision

Comitter:
jclondonol
Date:
Tue Jun 06 15:24:02 2017 +0000
Commit message:
listo

Changed in this revision

DebouncedIn.cpp Show annotated file Show diff for this revision Revisions of this file
DebouncedIn.h Show annotated file Show diff for this revision Revisions of this file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedIn.cpp	Tue Jun 06 15:24:02 2017 +0000
@@ -0,0 +1,91 @@
+#include "DebouncedIn.h"
+#include "mbed.h"
+ 
+/*
+ * Constructor
+ */
+DebouncedIn::DebouncedIn(PinName in) 
+    : _in(in) {    
+        
+    // reset all the flags and counters    
+    _samples = 0;
+    _output = 0;
+    _output_last = 0;
+    _rising_flag = 0;
+    _falling_flag = 0;
+    _state_counter = 0;
+    
+    // Attach ticker
+    _ticker.attach(this, &DebouncedIn::_sample, 0.005);     
+}
+  
+void DebouncedIn::_sample() {
+ 
+    // 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)) {
+        _rising_flag++;
+        _state_counter = 0;
+    }
+ 
+    // Falling edge detection
+    else if ((_output == 0) && (_output_last == 1)) {
+        _falling_flag++;
+        _state_counter = 0;
+    }
+    
+    // steady state
+    else {
+        _state_counter++;
+    }
+    
+   // update the output
+    _output_last = _output;
+    
+}
+ 
+ 
+ 
+// return number of rising edges
+int DebouncedIn::rising(void) {
+    int return_value = _rising_flag; 
+    _rising_flag = 0;
+    return(return_value);
+}
+ 
+// return number of falling edges
+int DebouncedIn::falling(void) {
+    int return_value = _falling_flag; 
+    _falling_flag = 0;
+    return(return_value);
+}
+ 
+// return number of ticsk we've bene steady for
+int DebouncedIn::steady(void) {
+return(_state_counter);
+}
+ 
+// return the debounced status
+int DebouncedIn::read(void) {
+    return(_output);
+}
+ 
+// shorthand for read()
+DebouncedIn::operator int() {
+    return read();
+}
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedIn.h	Tue Jun 06 15:24:02 2017 +0000
@@ -0,0 +1,30 @@
+#include "mbed.h"
+ 
+    class DebouncedIn {
+        public:      
+             DebouncedIn(PinName in);
+ 
+             int read (void);
+             operator int();
+              
+             int rising(void);
+             int falling(void);
+             int steady(void);
+              
+        private :    
+               // objects
+               DigitalIn _in;    
+               Ticker _ticker;
+ 
+               // function to take a sample, and update flags
+               void _sample(void);
+ 
+               // counters and flags
+               int _samples;
+               int _output;
+               int _output_last;
+               int _rising_flag;
+               int _falling_flag;
+               int _state_counter;
+ 
+    };
\ No newline at end of file