Revision 1:7e4accb72e06, committed 2016-05-24

Comitter:

janhavi

Date:

Tue May 24 08:57:39 2016 +0000

Parent:

0:672241227e0d

Child:

2:b3d5973afde7

Commit message:

Simple debouncing library for switches

Changed in this revision

--- a/DebouncedIn.cpp	Fri Nov 27 16:05:32 2009 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,93 +0,0 @@
-#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();
-}
-
-

--- a/DebouncedIn.h	Fri Nov 27 16:05:32 2009 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,31 +0,0 @@
-#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

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedIn.lib	Tue May 24 08:57:39 2016 +0000
@@ -0,0 +1,1 @@
+DebouncedIn#e2ba40ab11e8

--- a/main.cpp	Fri Nov 27 16:05:32 2009 +0000
+++ b/main.cpp	Tue May 24 08:57:39 2016 +0000
@@ -3,7 +3,7 @@
 
 
 DigitalOut led(LED1);
-DebouncedIn button(p21);
+DebouncedIn button(PTC9);
 
 int main() {
 

--- a/mbed.bld	Fri Nov 27 16:05:32 2009 +0000
+++ b/mbed.bld	Tue May 24 08:57:39 2016 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/20a79241b4a0
+http://mbed.org/users/mbed_official/code/mbed/builds/7c328cabac7e
\ No newline at end of file