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.

#include "mbed.h"
#define MAIN
#include "global.h"

#define ADD 0x2000000
/*#define ADD 0x200000*/

/*static unsigned int gLEDOn=0x0;*/
static Occilator* gOccilator[2];

DigitalOut myled1(LED1);
DigitalOut myled2(LED2);
DigitalOut myled3(LED3);
DigitalOut myled4(LED4);
//static void tick();

int main() {
/*    gOccilator[0]=new Occilator(INTERRUPT_TIME_US);*/
/*    gOccilator[0]=Occilator::getInstance(OCC_SQUARE,INTERRUPT_TIME_US);*/
    gOccilator[0]=Occilator::getInstance(OCC_TRIANGLE,INTERRUPT_TIME_US);
    gOccilator[0]->setOmega(ADD);
/*    gOccilator[1]=new Occilator(INTERRUPT_TIME_US);*/
//    gOccilator[1]=Occilator::getInstance(OCC_SQUARE,INTERRUPT_TIME_US);
//    gOccilator[1]->setOmega(ADD+0x10000);
    int volume=0x10000;
    while(1) {
        wait(0.1);
 //       gOccilator[1]->setVolume(volume);
        gOccilator[0]->setVolume(volume);
        volume-=0x1000;
        if (volume < 0)
        {
            volume=0x10000;
        }
    }
}