Diff: main.cpp

Revision:

0:5ffec551c755

Child:

1:b6b866a58a87

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 18 05:48:12 2014 +0000
@@ -0,0 +1,88 @@
+#include "mbed.h"
+#include "PinDetect.h"
+#include "rtos.h"
+
+const int BUZZERS = 3;
+const int LETTERS = 27;
+
+Serial pc(USBTX, USBRX);
+PinDetect buttons [3] = {
+    PinDetect(D15),
+    PinDetect(D14),
+    PinDetect(D13)
+};
+
+// Note: there are only THREE PWMs on the board. So this is all we can use
+// for this particular method of sound output.
+PwmOut buzzers [3] = {
+    PwmOut(D0),
+    PwmOut(D2),
+    PwmOut(D3)
+};
+// Periods of notes in microseconds
+int notePeriods [8] = {
+    3818,   // C4
+    3412,   // D4
+    3030,   // E4
+    2895,   // F4
+    2551,   // G4
+    2273,   // A4
+    2024,   // B4
+    10000000 // inaudible pitch
+};
+int chords [LETTERS][BUZZERS] = {
+    {0, 7, 7}, // single notes
+    {1, 7, 7},
+    {2, 7, 7},
+    {3, 7, 7},
+    {4, 7, 7},
+    {5, 7, 7},
+    {6, 7, 7},
+    {0, 2, 7}, // diads
+    {0, 3, 7},
+    {0, 4, 7},
+    {0, 5, 7},
+    {1, 3, 7},
+    {1, 4, 7},
+    {1, 5, 7},
+    {1, 6, 7},
+    {2, 4, 7},
+    {2, 5, 7},
+    {2, 6, 7},
+    {3, 4, 7},
+    {3, 5, 7},
+    {4, 6, 7},
+    {0, 2, 4}, // triads
+    {0, 2, 5},
+    {0, 3, 5},
+    {1, 4, 6},
+    {1, 3, 4},
+    {1, 3, 6}
+};
+
+void playAllChords(void) {
+    for (int i = 0; i < LETTERS; i++) {
+        int *chord = chords[i];
+        for (int j = 0; j < BUZZERS; j++) {
+            int noteIndex = chord[j];
+            if (noteIndex == 7) {
+                buzzers[j] = 0;
+            }
+            else {
+                buzzers[j] = .5f;
+                int period = notePeriods[noteIndex];
+                buzzers[j].period_us(period);
+            }
+        }
+        wait_ms(1000);
+    }
+}
+
+int main() {
+    // Initialize all duty cycles to off, so we hear nothing.
+    for (int i = 0; i < BUZZERS; i++) {
+        buzzers[i] = 0.0f;
+    }
+    pc.printf("%c\n", 97);
+    // playAllChords();
+}
\ No newline at end of file