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Dependencies:   GPS_G mbed

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DebouncedIn.cpp@0:b2a6aa7c0c8c, 2015-06-19 (annotated)

Committer:
procesadores_FAC
Date:
Fri Jun 19 17:45:34 2015 +0000
Revision:
0:b2a6aa7c0c8c
Tarea UnalMed;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
procesadores_FAC 0:b2a6aa7c0c8c 1 #include "DebouncedIn.h"
procesadores_FAC 0:b2a6aa7c0c8c 2 #include "mbed.h"
procesadores_FAC 0:b2a6aa7c0c8c 3
procesadores_FAC 0:b2a6aa7c0c8c 4 /*
procesadores_FAC 0:b2a6aa7c0c8c 5 * Constructor
procesadores_FAC 0:b2a6aa7c0c8c 6 */
procesadores_FAC 0:b2a6aa7c0c8c 7 DebouncedIn::DebouncedIn(PinName in)
procesadores_FAC 0:b2a6aa7c0c8c 8 : _in(in) {
procesadores_FAC 0:b2a6aa7c0c8c 9
procesadores_FAC 0:b2a6aa7c0c8c 10 // reset all the flags and counters
procesadores_FAC 0:b2a6aa7c0c8c 11 _samples = 0;
procesadores_FAC 0:b2a6aa7c0c8c 12 _output = 0;
procesadores_FAC 0:b2a6aa7c0c8c 13 _output_last = 0;
procesadores_FAC 0:b2a6aa7c0c8c 14 _rising_flag = 0;
procesadores_FAC 0:b2a6aa7c0c8c 15 _falling_flag = 0;
procesadores_FAC 0:b2a6aa7c0c8c 16 _state_counter = 0;
procesadores_FAC 0:b2a6aa7c0c8c 17
procesadores_FAC 0:b2a6aa7c0c8c 18 // Attach ticker
procesadores_FAC 0:b2a6aa7c0c8c 19 _ticker.attach(this, &DebouncedIn::_sample, 0.005);
procesadores_FAC 0:b2a6aa7c0c8c 20 }
procesadores_FAC 0:b2a6aa7c0c8c 21
procesadores_FAC 0:b2a6aa7c0c8c 22 void DebouncedIn::_sample() {
procesadores_FAC 0:b2a6aa7c0c8c 23
procesadores_FAC 0:b2a6aa7c0c8c 24 // take a sample
procesadores_FAC 0:b2a6aa7c0c8c 25 _samples = _samples >> 1; // shift left
procesadores_FAC 0:b2a6aa7c0c8c 26
procesadores_FAC 0:b2a6aa7c0c8c 27 if (_in) {
procesadores_FAC 0:b2a6aa7c0c8c 28 _samples |= 0x80;
procesadores_FAC 0:b2a6aa7c0c8c 29 }
procesadores_FAC 0:b2a6aa7c0c8c 30
procesadores_FAC 0:b2a6aa7c0c8c 31 // examine the sample window, look for steady state
procesadores_FAC 0:b2a6aa7c0c8c 32 if (_samples == 0x00) {
procesadores_FAC 0:b2a6aa7c0c8c 33 _output = 0;
procesadores_FAC 0:b2a6aa7c0c8c 34 }
procesadores_FAC 0:b2a6aa7c0c8c 35 else if (_samples == 0xFF) {
procesadores_FAC 0:b2a6aa7c0c8c 36 _output = 1;
procesadores_FAC 0:b2a6aa7c0c8c 37 }
procesadores_FAC 0:b2a6aa7c0c8c 38
procesadores_FAC 0:b2a6aa7c0c8c 39
procesadores_FAC 0:b2a6aa7c0c8c 40 // Rising edge detection
procesadores_FAC 0:b2a6aa7c0c8c 41 if ((_output == 1) && (_output_last == 0)) {
procesadores_FAC 0:b2a6aa7c0c8c 42 _rising_flag++;
procesadores_FAC 0:b2a6aa7c0c8c 43 _state_counter = 0;
procesadores_FAC 0:b2a6aa7c0c8c 44 }
procesadores_FAC 0:b2a6aa7c0c8c 45
procesadores_FAC 0:b2a6aa7c0c8c 46 // Falling edge detection
procesadores_FAC 0:b2a6aa7c0c8c 47 else if ((_output == 0) && (_output_last == 1)) {
procesadores_FAC 0:b2a6aa7c0c8c 48 _falling_flag++;
procesadores_FAC 0:b2a6aa7c0c8c 49 _state_counter = 0;
procesadores_FAC 0:b2a6aa7c0c8c 50 }
procesadores_FAC 0:b2a6aa7c0c8c 51
procesadores_FAC 0:b2a6aa7c0c8c 52 // steady state
procesadores_FAC 0:b2a6aa7c0c8c 53 else {
procesadores_FAC 0:b2a6aa7c0c8c 54 _state_counter++;
procesadores_FAC 0:b2a6aa7c0c8c 55 }
procesadores_FAC 0:b2a6aa7c0c8c 56
procesadores_FAC 0:b2a6aa7c0c8c 57 // update the output
procesadores_FAC 0:b2a6aa7c0c8c 58 _output_last = _output;
procesadores_FAC 0:b2a6aa7c0c8c 59
procesadores_FAC 0:b2a6aa7c0c8c 60 }
procesadores_FAC 0:b2a6aa7c0c8c 61
procesadores_FAC 0:b2a6aa7c0c8c 62
procesadores_FAC 0:b2a6aa7c0c8c 63
procesadores_FAC 0:b2a6aa7c0c8c 64 // return number of rising edges
procesadores_FAC 0:b2a6aa7c0c8c 65 int DebouncedIn::rising(void) {
procesadores_FAC 0:b2a6aa7c0c8c 66 int return_value = _rising_flag;
procesadores_FAC 0:b2a6aa7c0c8c 67 _rising_flag = 0;
procesadores_FAC 0:b2a6aa7c0c8c 68 return(return_value);
procesadores_FAC 0:b2a6aa7c0c8c 69 }
procesadores_FAC 0:b2a6aa7c0c8c 70
procesadores_FAC 0:b2a6aa7c0c8c 71 // return number of falling edges
procesadores_FAC 0:b2a6aa7c0c8c 72 int DebouncedIn::falling(void) {
procesadores_FAC 0:b2a6aa7c0c8c 73 int return_value = _falling_flag;
procesadores_FAC 0:b2a6aa7c0c8c 74 _falling_flag = 0;
procesadores_FAC 0:b2a6aa7c0c8c 75 return(return_value);
procesadores_FAC 0:b2a6aa7c0c8c 76 }
procesadores_FAC 0:b2a6aa7c0c8c 77
procesadores_FAC 0:b2a6aa7c0c8c 78 // return number of ticsk we've bene steady for
procesadores_FAC 0:b2a6aa7c0c8c 79 int DebouncedIn::steady(void) {
procesadores_FAC 0:b2a6aa7c0c8c 80 return(_state_counter);
procesadores_FAC 0:b2a6aa7c0c8c 81 }
procesadores_FAC 0:b2a6aa7c0c8c 82
procesadores_FAC 0:b2a6aa7c0c8c 83 // return the debounced status
procesadores_FAC 0:b2a6aa7c0c8c 84 int DebouncedIn::read(void) {
procesadores_FAC 0:b2a6aa7c0c8c 85 return(_output);
procesadores_FAC 0:b2a6aa7c0c8c 86 }
procesadores_FAC 0:b2a6aa7c0c8c 87
procesadores_FAC 0:b2a6aa7c0c8c 88 // shorthand for read()
procesadores_FAC 0:b2a6aa7c0c8c 89 DebouncedIn::operator int() {
procesadores_FAC 0:b2a6aa7c0c8c 90 return read();
procesadores_FAC 0:b2a6aa7c0c8c 91 }
procesadores_FAC 0:b2a6aa7c0c8c 92
procesadores_FAC 0:b2a6aa7c0c8c 93