Wave Table Synthesizer(Occilator only). I will make Envelope Generator and MML for play music.
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.
Square.cpp@10:40bed7449a81, 2016-02-10 (annotated)
- Committer:
- 117Florian
- Date:
- Wed Feb 10 10:55:08 2016 +0000
- Revision:
- 10:40bed7449a81
- Parent:
- 5:3a753cf68fac
Adjust volume saw.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
117Florian | 4:2febde858269 | 1 | #include <mbed.h> |
117Florian | 4:2febde858269 | 2 | #include <Square.h> |
117Florian | 4:2febde858269 | 3 | |
117Florian | 4:2febde858269 | 4 | |
117Florian | 4:2febde858269 | 5 | Square::Square(long interrupt_us) : Occilator(interrupt_us) |
117Florian | 4:2febde858269 | 6 | { |
117Florian | 5:3a753cf68fac | 7 | } |
117Florian | 5:3a753cf68fac | 8 | |
117Florian | 5:3a753cf68fac | 9 | unsigned long Square::tick() |
117Florian | 5:3a753cf68fac | 10 | { |
117Florian | 5:3a753cf68fac | 11 | Occilator::tick(); |
117Florian | 5:3a753cf68fac | 12 | if (m_Angle & 0x80000000) |
117Florian | 5:3a753cf68fac | 13 | { |
117Florian | 5:3a753cf68fac | 14 | return (0xffff*m_Volume) >> 16; |
117Florian | 5:3a753cf68fac | 15 | } |
117Florian | 5:3a753cf68fac | 16 | else |
117Florian | 5:3a753cf68fac | 17 | { |
117Florian | 5:3a753cf68fac | 18 | return 0; |
117Florian | 5:3a753cf68fac | 19 | } |
117Florian | 4:2febde858269 | 20 | } |