Tsuyoshi TSUCHIMOTO / Mbed 2 deprecated Synthesizer

Wave Table Synthesizer(Occilator only). I will make Envelope Generator and MML for play music.

Dependencies:   mbed

Project: Synthesizer. It is using embed to Chip Tune Synthesizer for NXP LPC1768.

At First

Prepare an amplifier with volume wheel. The amplifier wire at pin1 to pin18(D/A converter) from IC Clip or Breedboard.

Play

Check out this project and deploy your mbed. And then push the reset key.

You hear a sound from amplifier.

Modify

First step, you can see main.cpp. This source file plays an occilator with "wait()". Modify frequency at 

#define ADD 0x2000000

on the top of source.

Occilator select 7 waveforms.

  • OCC_NONE,
  • OCC_SQUARE,
  • OCC_SINE,
  • OCC_SAW,
  • OCC_WT,
  • OCC_NOISE,
  • OCC_TRIANGLE,

WT means WaveTable Synthesizer.Use "setWave()" function at first.Wavetable will copy in instance.

Change there for waveform.

    gOccilator[0]=Occilator::getInstance(OCC_SAW,INTERRUPT_TIME_US);

INTERRUPT_TIME_US depends sampling rate. Don't change.

Total volume of D/A converter is setting this place.

        gOccilator[0]->setVolume(volume);

By the way, this sample output 0 to 1V(not3.3V) for deforming distortion.

ToDo

  • Envelope generator and LFO(with delay)
  • MML(Music Macro Language)
  • Sample Song(I will make a Japanese Anime music,perhaps)

Project Goal Date

I will make for Comic Market 90(2016.Aug. in Tokyo).And these thing will be written in a Doujinshi.

Diff: main.cpp

Revision:
2:96affff92e0e
Parent:
1:af7abed0bfb5
Child:
3:32094530d55e
--- a/main.cpp	Thu Jan 21 10:24:33 2016 +0000
+++ b/main.cpp	Fri Jan 22 05:26:04 2016 +0000
@@ -15,29 +15,19 @@
 //static void tick();
 
 int main() {
-//    gTicker.attach_us(tick,22);
-//    myled1=1;
     gChannel[0]=new Channel(INTERRUPT_TIME_US);
     gChannel[0]->setOmega(ADD);
     gChannel[1]=new Channel(INTERRUPT_TIME_US);
     gChannel[1]->setOmega(ADD+0x100000);
+    int volume=0x1000;
     while(1) {
-        wait(1);
+        wait(0.1);
+        gChannel[1]->setVolume(volume);
+        gChannel[0]->setVolume(volume);
+        volume-=0x100;
+        if (volume < 0)
+        {
+            volume=0x1000;
+        }
     }
 }
-/*
-void tick()
-{
-    if (gLEDOn & 0x80000000)
-    {
-        myled = 1;
-        signal = 0xffff0000;
-    }
-    else
-    {
-        myled = 0;
-        signal = 0;
-    }
-    gLEDOn+=ADD;
-}
-*/
\ No newline at end of file