Skool - ARM Hungary
Simple program playing a song using PWM on a speaker.
Dependencies: mbed
Revision 0:b34f133646a8, committed 2015-10-02
- Comitter:
- lvagasi
- Date:
- Fri Oct 02 21:36:39 2015 +0000
- Commit message:
- Simple program to show how PWM can be used to play a simple song on a speaker. Working.
Changed in this revision
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
| wurlitzer.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Oct 02 21:36:39 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/34e6b704fe68 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wurlitzer.cpp Fri Oct 02 21:36:39 2015 +0000
@@ -0,0 +1,41 @@
+#include "mbed.h"
+
+PwmOut speaker(PB_4); // Speaker
+DigitalOut myled(PA_10);
+
+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,
+ 216.0f, 225.0f, 243.0f, 259.2f, 270.0f, 288.0f, 300.0f, 324.0f, 345.6f, 360.0f, 388.8f, 405.0f,
+ 432.0f, 450.0f, 486.0f, 518.4f, 540.0f, 576.0f, 600.0f, 648.0f, 691.2f, 720.0f, 777.6f, 810.0f,
+ 864.0f };
+
+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},
+ {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},
+ {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},
+ {16, 4}, {18, 4}, {20, 4}, {18, 4}, {16, 2}, { 0, 2} };
+
+
+int main() {
+ float tone;
+ int i;
+
+ myled = 1;
+
+ for (i = 0; i < 54; i++) {
+ if (song[i][0] > 0.0f) {
+ tone = float(1.0f/scala[song[i][0]]);
+ speaker.period(tone);
+ speaker = 0.5;
+ } else {
+ speaker = 0;
+ }
+ wait(float(1.0f/song[i][1]));
+ }
+ while (1) {
+ myled = 0; // LED is ON
+ wait(0.2); // 200 ms
+ myled = 1; // LED is OFF
+ wait(1.0); // 1 sec
+ }
+
+}
+
\ No newline at end of file