Nicolas Fernandez Sanz / Mbed 2 deprecated TP1_EJER03_FERNANDEZ_CLERICI

VersionFinal

Dependencies:   mbed tsi_sensor

DebouncedIn.cpp@0:9475a54ade9e, 2019-06-16 (annotated)

Committer:
NIcolasFernandezSanz
Date:
Sun Jun 16 01:19:26 2019 +0000
Revision:
0:9475a54ade9e
FERNANDEZ_CLERICI;

Who changed what in which revision?

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NIcolasFernandezSanz 0:9475a54ade9e 1 #include "DebouncedIn.h"
NIcolasFernandezSanz 0:9475a54ade9e 2 #include "mbed.h"
NIcolasFernandezSanz 0:9475a54ade9e 3
NIcolasFernandezSanz 0:9475a54ade9e 4 /*
NIcolasFernandezSanz 0:9475a54ade9e 5 * Constructor
NIcolasFernandezSanz 0:9475a54ade9e 6 */
NIcolasFernandezSanz 0:9475a54ade9e 7 DebouncedIn::DebouncedIn(PinName in)
NIcolasFernandezSanz 0:9475a54ade9e 8 : _in(in) {
NIcolasFernandezSanz 0:9475a54ade9e 9
NIcolasFernandezSanz 0:9475a54ade9e 10 // reset all the flags and counters
NIcolasFernandezSanz 0:9475a54ade9e 11 _samples = 0;
NIcolasFernandezSanz 0:9475a54ade9e 12 _output = 0;
NIcolasFernandezSanz 0:9475a54ade9e 13 _output_last = 0;
NIcolasFernandezSanz 0:9475a54ade9e 14 _rising_flag = 0;
NIcolasFernandezSanz 0:9475a54ade9e 15 _falling_flag = 0;
NIcolasFernandezSanz 0:9475a54ade9e 16 _state_counter = 0;
NIcolasFernandezSanz 0:9475a54ade9e 17
NIcolasFernandezSanz 0:9475a54ade9e 18 // Attach ticker
NIcolasFernandezSanz 0:9475a54ade9e 19 _ticker.attach(this, &DebouncedIn::_sample, 0.005);
NIcolasFernandezSanz 0:9475a54ade9e 20 }
NIcolasFernandezSanz 0:9475a54ade9e 21
NIcolasFernandezSanz 0:9475a54ade9e 22 void DebouncedIn::_sample() {
NIcolasFernandezSanz 0:9475a54ade9e 23
NIcolasFernandezSanz 0:9475a54ade9e 24 // take a sample
NIcolasFernandezSanz 0:9475a54ade9e 25 _samples = _samples >> 1; // shift left
NIcolasFernandezSanz 0:9475a54ade9e 26
NIcolasFernandezSanz 0:9475a54ade9e 27 if (_in) {
NIcolasFernandezSanz 0:9475a54ade9e 28 _samples |= 0x80;
NIcolasFernandezSanz 0:9475a54ade9e 29 }
NIcolasFernandezSanz 0:9475a54ade9e 30
NIcolasFernandezSanz 0:9475a54ade9e 31 // examine the sample window, look for steady state
NIcolasFernandezSanz 0:9475a54ade9e 32 if (_samples == 0x00) {
NIcolasFernandezSanz 0:9475a54ade9e 33 _output = 0;
NIcolasFernandezSanz 0:9475a54ade9e 34 }
NIcolasFernandezSanz 0:9475a54ade9e 35 else if (_samples == 0xFF) {
NIcolasFernandezSanz 0:9475a54ade9e 36 _output = 1;
NIcolasFernandezSanz 0:9475a54ade9e 37 }
NIcolasFernandezSanz 0:9475a54ade9e 38
NIcolasFernandezSanz 0:9475a54ade9e 39
NIcolasFernandezSanz 0:9475a54ade9e 40 // Rising edge detection
NIcolasFernandezSanz 0:9475a54ade9e 41 if ((_output == 1) && (_output_last == 0)) {
NIcolasFernandezSanz 0:9475a54ade9e 42 _rising_flag++;
NIcolasFernandezSanz 0:9475a54ade9e 43 _state_counter = 0;
NIcolasFernandezSanz 0:9475a54ade9e 44 }
NIcolasFernandezSanz 0:9475a54ade9e 45
NIcolasFernandezSanz 0:9475a54ade9e 46 // Falling edge detection
NIcolasFernandezSanz 0:9475a54ade9e 47 else if ((_output == 0) && (_output_last == 1)) {
NIcolasFernandezSanz 0:9475a54ade9e 48 _falling_flag++;
NIcolasFernandezSanz 0:9475a54ade9e 49 _state_counter = 0;
NIcolasFernandezSanz 0:9475a54ade9e 50 }
NIcolasFernandezSanz 0:9475a54ade9e 51
NIcolasFernandezSanz 0:9475a54ade9e 52 // steady state
NIcolasFernandezSanz 0:9475a54ade9e 53 else {
NIcolasFernandezSanz 0:9475a54ade9e 54 _state_counter++;
NIcolasFernandezSanz 0:9475a54ade9e 55 }
NIcolasFernandezSanz 0:9475a54ade9e 56
NIcolasFernandezSanz 0:9475a54ade9e 57 // update the output
NIcolasFernandezSanz 0:9475a54ade9e 58 _output_last = _output;
NIcolasFernandezSanz 0:9475a54ade9e 59
NIcolasFernandezSanz 0:9475a54ade9e 60 }
NIcolasFernandezSanz 0:9475a54ade9e 61
NIcolasFernandezSanz 0:9475a54ade9e 62
NIcolasFernandezSanz 0:9475a54ade9e 63
NIcolasFernandezSanz 0:9475a54ade9e 64 // return number of rising edges
NIcolasFernandezSanz 0:9475a54ade9e 65 int DebouncedIn::rising(void) {
NIcolasFernandezSanz 0:9475a54ade9e 66 int return_value = _rising_flag;
NIcolasFernandezSanz 0:9475a54ade9e 67 _rising_flag = 0;
NIcolasFernandezSanz 0:9475a54ade9e 68 return(return_value);
NIcolasFernandezSanz 0:9475a54ade9e 69 }
NIcolasFernandezSanz 0:9475a54ade9e 70
NIcolasFernandezSanz 0:9475a54ade9e 71 // return number of falling edges
NIcolasFernandezSanz 0:9475a54ade9e 72 int DebouncedIn::falling(void) {
NIcolasFernandezSanz 0:9475a54ade9e 73 int return_value = _falling_flag;
NIcolasFernandezSanz 0:9475a54ade9e 74 _falling_flag = 0;
NIcolasFernandezSanz 0:9475a54ade9e 75 return(return_value);
NIcolasFernandezSanz 0:9475a54ade9e 76 }
NIcolasFernandezSanz 0:9475a54ade9e 77
NIcolasFernandezSanz 0:9475a54ade9e 78 // return number of ticsk we've bene steady for
NIcolasFernandezSanz 0:9475a54ade9e 79 int DebouncedIn::steady(void) {
NIcolasFernandezSanz 0:9475a54ade9e 80 return(_state_counter);
NIcolasFernandezSanz 0:9475a54ade9e 81 }
NIcolasFernandezSanz 0:9475a54ade9e 82
NIcolasFernandezSanz 0:9475a54ade9e 83 // return the debounced status
NIcolasFernandezSanz 0:9475a54ade9e 84 int DebouncedIn::read(void) {
NIcolasFernandezSanz 0:9475a54ade9e 85 return(_output);
NIcolasFernandezSanz 0:9475a54ade9e 86 }
NIcolasFernandezSanz 0:9475a54ade9e 87
NIcolasFernandezSanz 0:9475a54ade9e 88 // shorthand for read()
NIcolasFernandezSanz 0:9475a54ade9e 89 DebouncedIn::operator int() {
NIcolasFernandezSanz 0:9475a54ade9e 90 return read();
NIcolasFernandezSanz 0:9475a54ade9e 91 }
NIcolasFernandezSanz 0:9475a54ade9e 92
NIcolasFernandezSanz 0:9475a54ade9e 93