Bhakti Kulkarni / Mbed 2 deprecated Happy_Birthday

Plays the happy birthday song music on the speaker.

Dependencies:   DebounceInterrupts mbed

DebouncedIn.cpp@0:33ad8330e62d, 2014-06-10 (annotated)

Committer:
bhakti08
Date:
Tue Jun 10 21:53:29 2014 +0000
Revision:
0:33ad8330e62d
Happy Birthday Song using mbed;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bhakti08 0:33ad8330e62d 1 #include "DebouncedIn.h"
bhakti08 0:33ad8330e62d 2 #include "mbed.h"
bhakti08 0:33ad8330e62d 3
bhakti08 0:33ad8330e62d 4 /*
bhakti08 0:33ad8330e62d 5 * Constructor
bhakti08 0:33ad8330e62d 6 */
bhakti08 0:33ad8330e62d 7 DebouncedIn::DebouncedIn(PinName in)
bhakti08 0:33ad8330e62d 8 : _in(in) {
bhakti08 0:33ad8330e62d 9
bhakti08 0:33ad8330e62d 10 // reset all the flags and counters
bhakti08 0:33ad8330e62d 11 _samples = 0;
bhakti08 0:33ad8330e62d 12 _output = 0;
bhakti08 0:33ad8330e62d 13 _output_last = 0;
bhakti08 0:33ad8330e62d 14 _rising_flag = 0;
bhakti08 0:33ad8330e62d 15 _falling_flag = 0;
bhakti08 0:33ad8330e62d 16 _state_counter = 0;
bhakti08 0:33ad8330e62d 17
bhakti08 0:33ad8330e62d 18 // Attach ticker
bhakti08 0:33ad8330e62d 19 _ticker.attach(this, &DebouncedIn::_sample, 0.005);
bhakti08 0:33ad8330e62d 20 }
bhakti08 0:33ad8330e62d 21
bhakti08 0:33ad8330e62d 22 void DebouncedIn::_sample() {
bhakti08 0:33ad8330e62d 23
bhakti08 0:33ad8330e62d 24 // take a sample
bhakti08 0:33ad8330e62d 25 _samples = _samples >> 1; // shift left
bhakti08 0:33ad8330e62d 26
bhakti08 0:33ad8330e62d 27 if (_in) {
bhakti08 0:33ad8330e62d 28 _samples |= 0x80;
bhakti08 0:33ad8330e62d 29 }
bhakti08 0:33ad8330e62d 30
bhakti08 0:33ad8330e62d 31 // examine the sample window, look for steady state
bhakti08 0:33ad8330e62d 32 if (_samples == 0x00) {
bhakti08 0:33ad8330e62d 33 _output = 0;
bhakti08 0:33ad8330e62d 34 }
bhakti08 0:33ad8330e62d 35 else if (_samples == 0xFF) {
bhakti08 0:33ad8330e62d 36 _output = 1;
bhakti08 0:33ad8330e62d 37 }
bhakti08 0:33ad8330e62d 38
bhakti08 0:33ad8330e62d 39
bhakti08 0:33ad8330e62d 40 // Rising edge detection
bhakti08 0:33ad8330e62d 41 if ((_output == 1) && (_output_last == 0)) {
bhakti08 0:33ad8330e62d 42 _rising_flag++;
bhakti08 0:33ad8330e62d 43 _state_counter = 0;
bhakti08 0:33ad8330e62d 44 }
bhakti08 0:33ad8330e62d 45
bhakti08 0:33ad8330e62d 46 // Falling edge detection
bhakti08 0:33ad8330e62d 47 else if ((_output == 0) && (_output_last == 1)) {
bhakti08 0:33ad8330e62d 48 _falling_flag++;
bhakti08 0:33ad8330e62d 49 _state_counter = 0;
bhakti08 0:33ad8330e62d 50 }
bhakti08 0:33ad8330e62d 51
bhakti08 0:33ad8330e62d 52 // steady state
bhakti08 0:33ad8330e62d 53 else {
bhakti08 0:33ad8330e62d 54 _state_counter++;
bhakti08 0:33ad8330e62d 55 }
bhakti08 0:33ad8330e62d 56
bhakti08 0:33ad8330e62d 57 // update the output
bhakti08 0:33ad8330e62d 58 _output_last = _output;
bhakti08 0:33ad8330e62d 59
bhakti08 0:33ad8330e62d 60 }
bhakti08 0:33ad8330e62d 61
bhakti08 0:33ad8330e62d 62
bhakti08 0:33ad8330e62d 63
bhakti08 0:33ad8330e62d 64 // return number of rising edges
bhakti08 0:33ad8330e62d 65 int DebouncedIn::rising(void) {
bhakti08 0:33ad8330e62d 66 int return_value = _rising_flag;
bhakti08 0:33ad8330e62d 67 _rising_flag = 0;
bhakti08 0:33ad8330e62d 68 return(return_value);
bhakti08 0:33ad8330e62d 69 }
bhakti08 0:33ad8330e62d 70
bhakti08 0:33ad8330e62d 71 // return number of falling edges
bhakti08 0:33ad8330e62d 72 int DebouncedIn::falling(void) {
bhakti08 0:33ad8330e62d 73 int return_value = _falling_flag;
bhakti08 0:33ad8330e62d 74 _falling_flag = 0;
bhakti08 0:33ad8330e62d 75 return(return_value);
bhakti08 0:33ad8330e62d 76 }
bhakti08 0:33ad8330e62d 77
bhakti08 0:33ad8330e62d 78 // return number of ticsk we've bene steady for
bhakti08 0:33ad8330e62d 79 int DebouncedIn::steady(void) {
bhakti08 0:33ad8330e62d 80 return(_state_counter);
bhakti08 0:33ad8330e62d 81 }
bhakti08 0:33ad8330e62d 82
bhakti08 0:33ad8330e62d 83 // return the debounced status
bhakti08 0:33ad8330e62d 84 int DebouncedIn::read(void) {
bhakti08 0:33ad8330e62d 85 return(_output);
bhakti08 0:33ad8330e62d 86 }
bhakti08 0:33ad8330e62d 87
bhakti08 0:33ad8330e62d 88 // shorthand for read()
bhakti08 0:33ad8330e62d 89 DebouncedIn::operator int() {
bhakti08 0:33ad8330e62d 90 return read();
bhakti08 0:33ad8330e62d 91 }
bhakti08 0:33ad8330e62d 92
bhakti08 0:33ad8330e62d 93