tone.cpp

00001 #include "tone.h"
00002 
00003 DigitalOut speakerOut(buzz);   // Set up speaker on digital pin 7
00004 
00005 // MELODIES and TIMING //
00006 //  melody[] is an array of notes, accompanied by beats[],
00007 //  which sets each note's relative length (higher #, longer note)
00008 
00009 // Melody 1: Star Wars Imperial March
00010 int melody1[] = {  a4, R,  a4, R,  a4, R,  f4, R, c5, R,  a4, R,  f4, R, c5, R, a4, R,  e5, R,  e5, R,  e5, R,  f5, R, c5, R,  g5, R,  f5, R,  c5, R, a4, R};
00011 int beats1[]  = {  50, 20, 50, 20, 50, 20, 40, 5, 20, 5,  60, 10, 40, 5, 20, 5, 60, 80, 50, 20, 50, 20, 50, 20, 40, 5, 20, 5,  60, 10, 40, 5,  20, 5, 60, 40};
00012 
00013 // Melody 2: Star Wars Theme
00014 int melody2[] = {  f4,  f4, f4,  a4s,   f5,  d5s,  d5,  c5, a5s, f5, d5s,  d5,  c5, a5s, f5, d5s, d5, d5s,   c5};
00015 int beats2[]  = {  21,  21, 21,  128,  128,   21,  21,  21, 128, 64,  21,  21,  21, 128, 64,  21, 21,  21, 128 };
00016 
00017 int MAX_COUNT = sizeof(melody1) / 2; // Melody length, for looping.
00018 long tempo = 10000; // Set overall tempo
00019 int pause = 1000; // Set length of pause between notes
00020 int rest_count = 1; // Loop variable to increase Rest length (BLETCHEROUS HACK; See NOTES)
00021 // Initialize core variables
00022 int toneM = 0;
00023 int beat = 0;
00024 long duration  = 0;
00025 // PLAY TONE  //
00026 // Pulse the speaker to play a tone for a particular duration
00027 void imperial_march()
00028 {
00029     for (int i=0; i<36; i++) {
00030         toneM = melody1[i];
00031         beat = beats1[i];
00032         duration = beat * tempo; // Set up timing
00033         long elapsed_time = 0;
00034         if (toneM > 0) { // if this isn't a Rest beat, while the tone has
00035             //  played less long than 'duration', pulse speaker HIGH and LOW
00036             while (elapsed_time < duration) {
00037                 speakerOut=1;
00038                 wait_us(toneM / 2);
00039                 speakerOut=0;
00040                 wait_us(toneM / 2);
00041                 elapsed_time += (toneM);
00042             }
00043         } else { // Rest beat; loop times delay
00044             for (int j = 0; j < rest_count; j++) { // See NOTE on rest_count
00045                 wait_us(duration);
00046             }
00047         }
00048     }
00049 }
00050