Revision 0:f1e3ef53cc3c, committed 2016-03-01

Comitter:

eencae

Date:

Tue Mar 01 15:58:55 2016 +0000

Child:

1:7c149b76c057

Commit message:

Changed default melody.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 01 15:58:55 2016 +0000
@@ -0,0 +1,201 @@
+/* Melody
+
+Play a simple melody on the DAC using a look-up table for the sine waveform
+Includes a primitive graphic equalizer on the LEDs
+
+Craig A. Evans
+
+March 2014
+
+*/
+
+#include "mbed.h"
+#include "tone.h" // note definitions
+
+#define PI 3.14159265359
+
+Timer noteTimer;  // timer for note duration
+AnalogOut aout(p18);  // DAC on pin 18
+BusOut leds(LED4,LED3,LED2,LED1);  // LEDs for display
+
+void initArray();  // function to initialise sample array
+void tone(float frequency,float duration);  // play a tone of set frequency for given duration
+void graphicEqualizer(float frequency);  // displays pattern on LEDs depending on the frequency
+
+int n = 32;  // number of samples
+float y[32]; // array to store samples
+float BPM = 73.0;  // beats per minute
+
+// comment one of the blocks out below - need noteArray[] and noteDuration[]
+
+/*
+// secret film melody...
+float noteArray[] = {
+    NOTE_E4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_E4,
+    NOTE_E4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_E4,NOTE_E4,NOTE_E4,
+    NOTE_E4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_E4,
+    NOTE_E4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_E4,NOTE_E4,NOTE_E4,
+    NOTE_DS5,NOTE_D5,NOTE_B4,NOTE_A4,NOTE_B4,NOTE_E4,NOTE_G4,NOTE_DS5,
+    NOTE_D5,NOTE_G4,NOTE_B4,NOTE_B4,NOTE_FS5,NOTE_F5,NOTE_B4,NOTE_D5,
+    NOTE_AS5,NOTE_A5,NOTE_F5,NOTE_A5,NOTE_DS6,NOTE_D6
+};
+
+// durations of the notes
+// 1/8th, 1/16th, 1/4th etc.
+float noteDuration[] = {
+    8,16,16,8,4,8,8,8,
+    8,16,16,8,4,8,8,8,
+    8,16,16,8,4,8,8,8,
+    8,16,16,8,4,8,8,8,
+    8,2,8,8,1,8,4,8,
+    4,8,8,8,8,4,8,4,
+    8,4,8,4,8,3
+};
+*/
+
+
+// secret computer game melody...
+float noteArray[] = {
+    NOTE_E7, NOTE_E7, 0, NOTE_E7,
+    0, NOTE_C7, NOTE_E7, 0,
+    NOTE_G7, 0, 0,  0,
+    NOTE_G6, 0, 0, 0,
+
+    NOTE_C7, 0, 0, NOTE_G6,
+    0, 0, NOTE_E6, 0,
+    0, NOTE_A6, 0, NOTE_B6,
+    0, NOTE_AS6, NOTE_A6, 0,
+
+    NOTE_G6, NOTE_E7, NOTE_G7,
+    NOTE_A7, 0, NOTE_F7, NOTE_G7,
+    0, NOTE_E7, 0,NOTE_C7,
+    NOTE_D7, NOTE_B6, 0, 0,
+
+    NOTE_C7, 0, 0, NOTE_G6,
+    0, 0, NOTE_E6, 0,
+    0, NOTE_A6, 0, NOTE_B6,
+    0, NOTE_AS6, NOTE_A6, 0,
+
+    NOTE_G6, NOTE_E7, NOTE_G7,
+    NOTE_A7, 0, NOTE_F7, NOTE_G7,
+    0, NOTE_E7, 0,NOTE_C7,
+    NOTE_D7, NOTE_B6, 0, 0
+};
+
+// durations of the notes
+// 1/8th, 1/16th, 1/4th etc.
+float noteDuration[] = {
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+
+    9, 9, 9,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+
+    9, 9, 9,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+    12, 12, 12, 12,
+
+};
+
+
+int main()
+{
+    initArray(); // fill array with sine samples
+
+    // calculate number of notes in array
+    //sizeof() returns number of BYTES in array,
+    // so divide by size of a float in BYTES to get number of elements
+    int notes = sizeof(noteArray)/sizeof(float);
+
+    while (1) {
+
+        // loop through notes
+        for(int i=0; i < notes; i++) {
+
+            // play note
+            tone(noteArray[i],60.0/(BPM*noteDuration[i]));
+            // leave a short pause between notes
+            wait(60.0/(BPM*noteDuration[i]));
+        }
+
+        wait(1.0);  // wait a second before repeating
+
+    }
+
+}
+
+void initArray()
+{
+    // create LUT - loop through array and calculate sine wave samples
+    for (int i = 0; i < n ; i++) {
+        y[i] = 0.5 + 0.5*sin(i*2*PI/n);
+    }
+
+}
+
+void tone(float frequency,float duration)
+{
+    graphicEqualizer(frequency);  // equalizer on LEDs
+
+    if (frequency > 0) {  // a frequency of 0 indicates no note played so only play a note if frequency is not 0
+
+        float dt = 1.0/(frequency*n) - (1.34e-6 + 1e-6);  // calculate time step - take into account DAC time and wait() offset
+
+        noteTimer.start(); // start timer
+
+        while(noteTimer.read() < duration) { // keep looping while timer less than duration
+
+            for (int i = 0; i < n ; i++) {  // loop through samples and output analog waveform
+                aout = y[i];
+                wait(dt); // leave appropriate delay for frequency
+            }
+        }
+
+        noteTimer.stop();  // stop the timer
+        noteTimer.reset(); // reset to 0
+
+    } else { // if no note played, have a simple delay
+        wait(duration);
+    }
+
+    leds = 0;   // turn off LEDs
+}
+
+// primitive graphic equalizer on the LEDs
+void graphicEqualizer(float frequency)
+{
+    // these numbers are fairly random and picked to give a
+    // decent effect when the melodies plays.
+    // Will have to change for different melodies 
+    if (frequency < 123) {
+        leds = 0;  // all off
+    } 
+    else if (frequency < 440) {
+        leds = 8;  // LED1
+    } 
+    else if (frequency < 523) {
+        leds = 12; // LED1,LED2
+    } 
+    else if (frequency < 1047) {
+        leds = 14; // LED1,LED2,LED3
+    } 
+    else {
+        leds = 15; // LED1,LED2,LED3,LED4 
+    }
+
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 01 15:58:55 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/8e73be2a2ac1
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tone.h	Tue Mar 01 15:58:55 2016 +0000
@@ -0,0 +1,90 @@
+// Note definitions from Arduino.cc
+#define NOTE_B0  31
+#define NOTE_C1  33
+#define NOTE_CS1 35
+#define NOTE_D1  37
+#define NOTE_DS1 39
+#define NOTE_E1  41
+#define NOTE_F1  44
+#define NOTE_FS1 46
+#define NOTE_G1  49
+#define NOTE_GS1 52
+#define NOTE_A1  55
+#define NOTE_AS1 58
+#define NOTE_B1  62
+#define NOTE_C2  65
+#define NOTE_CS2 69
+#define NOTE_D2  73
+#define NOTE_DS2 78
+#define NOTE_E2  82
+#define NOTE_F2  87
+#define NOTE_FS2 93
+#define NOTE_G2  98
+#define NOTE_GS2 104
+#define NOTE_A2  110
+#define NOTE_AS2 117
+#define NOTE_B2  123
+#define NOTE_C3  131
+#define NOTE_CS3 139
+#define NOTE_D3  147
+#define NOTE_DS3 156
+#define NOTE_E3  165
+#define NOTE_F3  175
+#define NOTE_FS3 185
+#define NOTE_G3  196
+#define NOTE_GS3 208
+#define NOTE_A3  220
+#define NOTE_AS3 233
+#define NOTE_B3  247
+#define NOTE_C4  262
+#define NOTE_CS4 277
+#define NOTE_D4  294
+#define NOTE_DS4 311
+#define NOTE_E4  330
+#define NOTE_F4  349
+#define NOTE_FS4 370
+#define NOTE_G4  392
+#define NOTE_GS4 415
+#define NOTE_A4  440
+#define NOTE_AS4 466
+#define NOTE_B4  494
+#define NOTE_C5  523
+#define NOTE_CS5 554
+#define NOTE_D5  587
+#define NOTE_DS5 622
+#define NOTE_E5  659
+#define NOTE_F5  698
+#define NOTE_FS5 740
+#define NOTE_G5  784
+#define NOTE_GS5 831
+#define NOTE_A5  880
+#define NOTE_AS5 932
+#define NOTE_B5  988
+#define NOTE_C6  1047
+#define NOTE_CS6 1109
+#define NOTE_D6  1175
+#define NOTE_DS6 1245
+#define NOTE_E6  1319
+#define NOTE_F6  1397
+#define NOTE_FS6 1480
+#define NOTE_G6  1568
+#define NOTE_GS6 1661
+#define NOTE_A6  1760
+#define NOTE_AS6 1865
+#define NOTE_B6  1976
+#define NOTE_C7  2093
+#define NOTE_CS7 2217
+#define NOTE_D7  2349
+#define NOTE_DS7 2489
+#define NOTE_E7  2637
+#define NOTE_F7  2794
+#define NOTE_FS7 2960
+#define NOTE_G7  3136
+#define NOTE_GS7 3322
+#define NOTE_A7  3520
+#define NOTE_AS7 3729
+#define NOTE_B7  3951
+#define NOTE_C8  4186
+#define NOTE_CS8 4435
+#define NOTE_D8  4699
+#define NOTE_DS8 4978
\ No newline at end of file