MakingMusicWorkshop / Mbed 2 deprecated 7_waveforms

change tone sounds by altering the waveforms

Dependencies:   mbed

Fork of 5_songs by MakingMusicWorkshop

main.cpp@4:02dc2ab8eabb, 2016-05-16 (annotated)

Committer:
maclobdell
Date:
Mon May 16 18:34:03 2016 +0000
Revision:
4:02dc2ab8eabb
Parent:
3:c04186a77ede
Child:
5:7003c9f6d633
removed rtos.h.  just using baremetal wait_ms for timing.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:0fb17f0d39e7 1 #include "mbed.h" // this tells us to load mbed related functions
maclobdell 1:8922cc02aec7 2 #include "tones.h" // list of all the tones and their frequencies
maclobdell 0:0fb17f0d39e7 3
maclobdell 0:0fb17f0d39e7 4 PwmOut buzzer(D3); // our buzzer is a PWM output (pulse-width modulation)
maclobdell 0:0fb17f0d39e7 5
maclobdell 0:0fb17f0d39e7 6 static int BPM = 120;
maclobdell 0:0fb17f0d39e7 7
maclobdell 0:0fb17f0d39e7 8 static void silence() {
maclobdell 0:0fb17f0d39e7 9 buzzer.write(0.0f); // silence!
maclobdell 0:0fb17f0d39e7 10 }
maclobdell 0:0fb17f0d39e7 11
maclobdell 0:0fb17f0d39e7 12 // this is our function that plays a tone.
maclobdell 0:0fb17f0d39e7 13 // Takes in a tone frequency, and after duration (in ms.) we stop playing again
maclobdell 0:0fb17f0d39e7 14 static void play_tone(int tone) {
maclobdell 2:610196c7b41c 15 buzzer.period_us(1000000/(tone));
maclobdell 0:0fb17f0d39e7 16 buzzer.write(0.10f); // 10% duty cycle, otherwise it's too loud
maclobdell 0:0fb17f0d39e7 17 }
maclobdell 0:0fb17f0d39e7 18
maclobdell 0:0fb17f0d39e7 19 static void play_song(int notes_left, int* melody, int* duration) {
maclobdell 1:8922cc02aec7 20
maclobdell 0:0fb17f0d39e7 21 // YOUR CODE HERE
maclobdell 4:02dc2ab8eabb 22
maclobdell 2:610196c7b41c 23
maclobdell 0:0fb17f0d39e7 24 }
maclobdell 0:0fb17f0d39e7 25
maclobdell 0:0fb17f0d39e7 26 // this code runs when the microcontroller starts up
maclobdell 1:8922cc02aec7 27 int main() {
maclobdell 2:610196c7b41c 28
maclobdell 0:0fb17f0d39e7 29 // declare a melody
maclobdell 0:0fb17f0d39e7 30 int melody[] = {
maclobdell 2:610196c7b41c 31 NOTE_G4, NOTE_G4, NOTE_G4, NOTE_DS3, NOTE_AS4,
maclobdell 2:610196c7b41c 32 NOTE_G4, NOTE_DS3, NOTE_AS4, NOTE_G4,
maclobdell 2:610196c7b41c 33 NOTE_D4, NOTE_D4, NOTE_D4, NOTE_DS4, NOTE_AS4,
maclobdell 2:610196c7b41c 34 NOTE_FS4, NOTE_DS4, NOTE_AS4, NOTE_G4
maclobdell 0:0fb17f0d39e7 35 };
maclobdell 2:610196c7b41c 36
maclobdell 0:0fb17f0d39e7 37 // note durations: 4 = quarter note, 8 = eighth note, etc.:
maclobdell 0:0fb17f0d39e7 38 int duration[] = {
maclobdell 2:610196c7b41c 39 2, 2, 2, 4, 4,
maclobdell 2:610196c7b41c 40 2, 4, 4, 1,
maclobdell 2:610196c7b41c 41 2, 2, 2, 4, 4,
maclobdell 2:610196c7b41c 42 2, 4, 4, 1
maclobdell 2:610196c7b41c 43 };
maclobdell 0:0fb17f0d39e7 44
maclobdell 0:0fb17f0d39e7 45 // melody & duration are on the heap, need to get them on the stack
maclobdell 0:0fb17f0d39e7 46 int *m = new int[sizeof(melody) / sizeof(int)];
maclobdell 0:0fb17f0d39e7 47 memcpy(m, melody, sizeof(melody));
maclobdell 0:0fb17f0d39e7 48 int *d = new int[sizeof(duration) / sizeof(int)];
maclobdell 0:0fb17f0d39e7 49 memcpy(d, duration, sizeof(duration));
maclobdell 0:0fb17f0d39e7 50
maclobdell 0:0fb17f0d39e7 51 if (sizeof(melody) != sizeof(duration)) {
maclobdell 0:0fb17f0d39e7 52 printf("Melody and duration do not have same number of elements! Aborting!\r\n");
maclobdell 2:610196c7b41c 53 return 1;
maclobdell 0:0fb17f0d39e7 54 }
maclobdell 0:0fb17f0d39e7 55
maclobdell 0:0fb17f0d39e7 56 play_song(sizeof(melody) / sizeof(int), m, d);
maclobdell 2:610196c7b41c 57
maclobdell 2:610196c7b41c 58 return 0;
maclobdell 0:0fb17f0d39e7 59 }