Diff: Drivers/Tone/tone.cpp

Revision:

1:1da89c13dfa1

Child:

4:81b0de07841f

diff -r 43331220df0d -r 1da89c13dfa1 Drivers/Tone/tone.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Drivers/Tone/tone.cpp	Sat Oct 11 03:53:27 2014 +0000
@@ -0,0 +1,50 @@
+#include "tone.h"
+
+DigitalOut speakerOut(buzz);   // Set up speaker on digital pin 7
+
+// MELODIES and TIMING //
+//  melody[] is an array of notes, accompanied by beats[],
+//  which sets each note's relative length (higher #, longer note)
+
+// Melody 1: Star Wars Imperial March
+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};
+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};
+
+// Melody 2: Star Wars Theme
+int melody2[] = {  f4,  f4, f4,  a4s,   f5,  d5s,  d5,  c5, a5s, f5, d5s,  d5,  c5, a5s, f5, d5s, d5, d5s,   c5};
+int beats2[]  = {  21,  21, 21,  128,  128,   21,  21,  21, 128, 64,  21,  21,  21, 128, 64,  21, 21,  21, 128 };
+
+int MAX_COUNT = sizeof(melody1) / 2; // Melody length, for looping.
+long tempo = 10000; // Set overall tempo
+int pause = 1000; // Set length of pause between notes
+int rest_count = 1; // Loop variable to increase Rest length (BLETCHEROUS HACK; See NOTES)
+// Initialize core variables
+int toneM = 0;
+int beat = 0;
+long duration  = 0;
+// PLAY TONE  //
+// Pulse the speaker to play a tone for a particular duration
+void imperial_march()
+{
+    for (int i=0; i<MAX_COUNT; i++) {
+        toneM = melody1[i];
+        beat = beats1[i];
+        duration = beat * tempo; // Set up timing
+        long elapsed_time = 0;
+        if (toneM > 0) { // if this isn't a Rest beat, while the tone has
+            //  played less long than 'duration', pulse speaker HIGH and LOW
+            while (elapsed_time < duration) {
+                speakerOut=1;
+                wait_us(toneM / 2);
+                speakerOut=0;
+                wait_us(toneM / 2);
+                elapsed_time += (toneM);
+            }
+        } else { // Rest beat; loop times delay
+            for (int j = 0; j < rest_count; j++) { // See NOTE on rest_count
+                wait_us(duration);
+            }
+        }
+    }
+}
+