Diff: noteplayer.cpp

Revision:

0:a6a8578e95af

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/noteplayer.cpp	Tue Jul 30 02:44:30 2019 +0000
@@ -0,0 +1,194 @@
+#include "noteplayer.h"
+
+float *audioDataBuffer = new float[128];
+volatile int bufferPOS = 0;
+Ticker SampleTime;
+
+void placeNewSample()
+{
+    speaker.write(audioDataBuffer[bufferPOS++]); //multiply by POT value for volume.
+    bufferPOS = (bufferPOS+1) & 0x07F;
+}
+
+void loadBuffer()
+{
+    printf("Generating sine...\r\n");
+    for(int i=0; i<128; i++) {
+        audioDataBuffer[i] =((1.0 + sin((double(i)/16.0*6.28318530717959)))/2.0); //formula copied from mbed example
+    }
+}
+
+note makeNote(unsigned char length, pitchname pitch2make)
+{
+    note madenote;
+    madenote.length = length;
+    madenote.pitch = pitch2make;
+    return madenote;
+}
+
+void playNote(note note2play)
+{
+    float SPB = 60.0*4.0/(120.0);
+    int PlayingFreq = pitch2freq(note2play.pitch);
+    if(PlayingFreq == 0) { //rest
+        wait((1/(float)note2play.length)*SPB);
+    } else {
+        int sampleRate = PlayingFreq * 16;
+        speaker.period_us(1); //1MHz
+        float ticker_period = (float) 1/(sampleRate);
+        printf("\r\nTicker Period: %f\tTicker Freq: %f\r\nTarget Freq: %i \r\n\r\n",ticker_period, 1/ticker_period, PlayingFreq);
+
+        SampleTime.attach(&placeNewSample,ticker_period);
+        wait((1/(float)note2play.length)*SPB);
+        SampleTime.detach();
+
+        printf("\033[A\033[A\033[A\033[A");
+    }
+}
+
+int pitch2freq(pitchname pitch2switch)
+{
+    switch(pitch2switch) {
+        case rest:
+            return 0;
+        case D2:
+            return 73;
+        case Ds2:
+            return 78;
+        case E2:
+            return 82;
+        case F2:
+            return 87;
+        case Fs2:
+            return 92;
+        case G2:
+            return 98;
+        case Gs2:
+            return 104;
+        case A2:
+            return 110;
+        case As2:
+            return 117;
+        case B2:
+            return 123;
+        case C3:
+            return 131;
+        case Cs3:
+            return 139;
+        case D3:
+            return 147;
+        case Ds3:
+            return 156;
+        case E3:
+            return 165;
+        case F3:
+            return 175;
+        case Fs3:
+            return 185;
+        case G3:
+            return 196;
+        case Gs3:
+            return 208;
+        case A3:
+            return 220;
+        case As3:
+            return 233;
+        case B3:
+            return 247;
+        case C4:
+            return 262;
+        case Cs4:
+            return 277;
+        case D4:
+            return 294;
+        case Ds4:
+            return 311;
+        case E4:
+            return 330;
+        case F4:
+            return 349;
+        case Fs4:
+            return 370;
+
+        case G4:
+            return 392;
+
+        case Gs4:
+            return 415;
+
+        case A4:
+            return 440;
+
+        case As4:
+            return 466;
+
+        case B4:
+            return 494;
+
+        case C5:
+            return 523;
+
+        case Cs5:
+            return 554;
+
+        case D5:
+            return 587;
+
+        case Ds5:
+            return 622;
+
+        case E5:
+            return 659;
+
+        case F5:
+            return 698;
+
+        case Fs5:
+            return 740;
+
+        case G5:
+            return 784;
+
+        case Gs5:
+            return 831;
+
+        case A5:
+            return 880;
+
+        case As5:
+            return 932;
+
+        case B5:
+            return 988;
+
+        case C6:
+            return 1047;
+
+        case Cs6:
+            return 1109;
+
+        case D6:
+            return 1175;
+
+        case Ds6:
+            return 1245;
+
+        case E6:
+            return 1319;
+
+        case F6:
+            return 1397;
+
+        case Fs6:
+            return 1480;
+
+        case G6:
+            return 1568;
+
+        case Gs6:
+            return 1661;
+
+        case END:
+            return -1;
+    }
+}
\ No newline at end of file