Skool - ARM Hungary / Mbed 2 deprecated Skool_Wurlitzer

Simple program playing a song using PWM on a speaker.

Dependencies:   mbed

wurlitzer.cpp@0:b34f133646a8, 2015-10-02 (annotated)

Committer:
lvagasi
Date:
Fri Oct 02 21:36:39 2015 +0000
Revision:
0:b34f133646a8
Simple program to show how PWM can be used to play a simple song on a speaker. Working.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lvagasi 0:b34f133646a8 1 #include "mbed.h"
lvagasi 0:b34f133646a8 2
lvagasi 0:b34f133646a8 3 PwmOut speaker(PB_4); // Speaker
lvagasi 0:b34f133646a8 4 DigitalOut myled(PA_10);
lvagasi 0:b34f133646a8 5
lvagasi 0:b34f133646a8 6 const float scala[38] = { 0.0f, 108.0f, 112.5f, 121.5f, 129.6f, 135.0f, 144.0f, 150.0f, 162.0f, 172.8f, 180.0f, 194.4f, 202.5f,
lvagasi 0:b34f133646a8 7 216.0f, 225.0f, 243.0f, 259.2f, 270.0f, 288.0f, 300.0f, 324.0f, 345.6f, 360.0f, 388.8f, 405.0f,
lvagasi 0:b34f133646a8 8 432.0f, 450.0f, 486.0f, 518.4f, 540.0f, 576.0f, 600.0f, 648.0f, 691.2f, 720.0f, 777.6f, 810.0f,
lvagasi 0:b34f133646a8 9 864.0f };
lvagasi 0:b34f133646a8 10
lvagasi 0:b34f133646a8 11 const uint32_t song[54][2] = { {16, 4}, {18, 4}, {20, 4}, {18, 4}, {16, 2}, { 0, 2}, {16, 4}, {18, 4}, {20, 4}, {18, 4}, {16, 2}, { 0, 2}, {20, 4}, {20, 4}, {21, 4}, {21, 4},
lvagasi 0:b34f133646a8 12 {20, 4}, {20, 4}, {18, 2}, {20, 4}, {20, 4}, {21, 4}, {21, 4}, {20, 4}, {20, 4}, {18, 2}, {20, 4}, {18, 4}, {20, 4}, {21, 4}, {23, 4}, {21, 4},
lvagasi 0:b34f133646a8 13 {20, 4}, {18, 4}, {20, 4}, {18, 4}, {20, 4}, {21, 4}, {23, 4}, {21, 4}, {20, 4}, {18, 4}, {16, 4}, {18, 4}, {20, 4}, {18, 4}, {16, 2}, { 0, 2},
lvagasi 0:b34f133646a8 14 {16, 4}, {18, 4}, {20, 4}, {18, 4}, {16, 2}, { 0, 2} };
lvagasi 0:b34f133646a8 15
lvagasi 0:b34f133646a8 16
lvagasi 0:b34f133646a8 17 int main() {
lvagasi 0:b34f133646a8 18 float tone;
lvagasi 0:b34f133646a8 19 int i;
lvagasi 0:b34f133646a8 20
lvagasi 0:b34f133646a8 21 myled = 1;
lvagasi 0:b34f133646a8 22
lvagasi 0:b34f133646a8 23 for (i = 0; i < 54; i++) {
lvagasi 0:b34f133646a8 24 if (song[i][0] > 0.0f) {
lvagasi 0:b34f133646a8 25 tone = float(1.0f/scala[song[i][0]]);
lvagasi 0:b34f133646a8 26 speaker.period(tone);
lvagasi 0:b34f133646a8 27 speaker = 0.5;
lvagasi 0:b34f133646a8 28 } else {
lvagasi 0:b34f133646a8 29 speaker = 0;
lvagasi 0:b34f133646a8 30 }
lvagasi 0:b34f133646a8 31 wait(float(1.0f/song[i][1]));
lvagasi 0:b34f133646a8 32 }
lvagasi 0:b34f133646a8 33 while (1) {
lvagasi 0:b34f133646a8 34 myled = 0; // LED is ON
lvagasi 0:b34f133646a8 35 wait(0.2); // 200 ms
lvagasi 0:b34f133646a8 36 myled = 1; // LED is OFF
lvagasi 0:b34f133646a8 37 wait(1.0); // 1 sec
lvagasi 0:b34f133646a8 38 }
lvagasi 0:b34f133646a8 39
lvagasi 0:b34f133646a8 40 }
lvagasi 0:b34f133646a8 41