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.
Occilator.cpp@4:2febde858269, 2016-01-30 (annotated)
- Committer:
- 117Florian
- Date:
- Sat Jan 30 09:52:44 2016 +0000
- Revision:
- 4:2febde858269
- Parent:
- 3:32094530d55e
- Child:
- 5:3a753cf68fac
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Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
117Florian | 3:32094530d55e | 1 | #include "mbed.h" |
117Florian | 3:32094530d55e | 2 | #include "global.h" |
117Florian | 3:32094530d55e | 3 | #include "Occilator.h" |
117Florian | 4:2febde858269 | 4 | #include "Square.h" |
117Florian | 3:32094530d55e | 5 | |
117Florian | 3:32094530d55e | 6 | static long interrupt_us; |
117Florian | 3:32094530d55e | 7 | static int part_num=0; |
117Florian | 3:32094530d55e | 8 | static Occilator* part[OCCILATOR_PART_NUM]; |
117Florian | 3:32094530d55e | 9 | static Ticker sTicker; |
117Florian | 3:32094530d55e | 10 | static long total_value_in_this_span; |
117Florian | 3:32094530d55e | 11 | static AnalogOut sAnalogOut(p18); |
117Florian | 3:32094530d55e | 12 | |
117Florian | 3:32094530d55e | 13 | /* interrupt handler */ |
117Florian | 3:32094530d55e | 14 | /*static void tick(uint32_t id);*/ |
117Florian | 3:32094530d55e | 15 | static void tick(); |
117Florian | 3:32094530d55e | 16 | |
117Florian | 4:2febde858269 | 17 | Occilator* Occilator::getInstance(Occilator_Type type,long interrupt_us) |
117Florian | 4:2febde858269 | 18 | { |
117Florian | 4:2febde858269 | 19 | switch(type) |
117Florian | 4:2febde858269 | 20 | { |
117Florian | 4:2febde858269 | 21 | case OCC_NONE: |
117Florian | 4:2febde858269 | 22 | case OCC_SQUARE: |
117Florian | 4:2febde858269 | 23 | return new Square(interrupt_us); |
117Florian | 4:2febde858269 | 24 | |
117Florian | 4:2febde858269 | 25 | case OCC_SINE: |
117Florian | 4:2febde858269 | 26 | case OCC_WT: |
117Florian | 4:2febde858269 | 27 | case OCC_NOISE: |
117Florian | 4:2febde858269 | 28 | return NULL; |
117Florian | 4:2febde858269 | 29 | } |
117Florian | 4:2febde858269 | 30 | } |
117Florian | 4:2febde858269 | 31 | |
117Florian | 3:32094530d55e | 32 | Occilator::Occilator(long interrupt_us) |
117Florian | 3:32094530d55e | 33 | { |
117Florian | 3:32094530d55e | 34 | myled1=1; |
117Florian | 3:32094530d55e | 35 | ::interrupt_us=interrupt_us; |
117Florian | 3:32094530d55e | 36 | if(part_num==0) |
117Florian | 3:32094530d55e | 37 | { |
117Florian | 3:32094530d55e | 38 | sTicker.attach_us(::tick,interrupt_us); |
117Florian | 3:32094530d55e | 39 | } |
117Florian | 3:32094530d55e | 40 | part_num++; |
117Florian | 3:32094530d55e | 41 | for(int i=0;i<OCCILATOR_PART_NUM;i++) |
117Florian | 3:32094530d55e | 42 | { |
117Florian | 3:32094530d55e | 43 | if(part[i]==NULL) |
117Florian | 3:32094530d55e | 44 | { |
117Florian | 3:32094530d55e | 45 | part[i]=this; |
117Florian | 3:32094530d55e | 46 | break; |
117Florian | 3:32094530d55e | 47 | } |
117Florian | 3:32094530d55e | 48 | } |
117Florian | 3:32094530d55e | 49 | |
117Florian | 3:32094530d55e | 50 | m_Volume=0x10000; |
117Florian | 3:32094530d55e | 51 | } |
117Florian | 3:32094530d55e | 52 | |
117Florian | 3:32094530d55e | 53 | Occilator::~Occilator() |
117Florian | 3:32094530d55e | 54 | { |
117Florian | 3:32094530d55e | 55 | part_num--; |
117Florian | 3:32094530d55e | 56 | for(int i=0;i<OCCILATOR_PART_NUM;i++) |
117Florian | 3:32094530d55e | 57 | { |
117Florian | 3:32094530d55e | 58 | if(part[i]==this) |
117Florian | 3:32094530d55e | 59 | { |
117Florian | 3:32094530d55e | 60 | part[i]=NULL; |
117Florian | 3:32094530d55e | 61 | break; |
117Florian | 3:32094530d55e | 62 | } |
117Florian | 3:32094530d55e | 63 | } |
117Florian | 3:32094530d55e | 64 | if(part_num<=0) |
117Florian | 3:32094530d55e | 65 | { |
117Florian | 3:32094530d55e | 66 | sTicker.detach(); |
117Florian | 3:32094530d55e | 67 | } |
117Florian | 3:32094530d55e | 68 | } |
117Florian | 3:32094530d55e | 69 | |
117Florian | 3:32094530d55e | 70 | void Occilator::setOmega(long speed) |
117Florian | 3:32094530d55e | 71 | { |
117Florian | 3:32094530d55e | 72 | m_Omega=speed; |
117Florian | 3:32094530d55e | 73 | myled2=1; |
117Florian | 3:32094530d55e | 74 | } |
117Florian | 3:32094530d55e | 75 | |
117Florian | 3:32094530d55e | 76 | void Occilator::setVolume(int volume) |
117Florian | 3:32094530d55e | 77 | { |
117Florian | 3:32094530d55e | 78 | m_Volume=volume; |
117Florian | 3:32094530d55e | 79 | } |
117Florian | 3:32094530d55e | 80 | |
117Florian | 3:32094530d55e | 81 | unsigned long Occilator::tick() |
117Florian | 3:32094530d55e | 82 | { |
117Florian | 3:32094530d55e | 83 | m_Angle+=m_Omega; |
117Florian | 3:32094530d55e | 84 | if (m_Angle & 0x80000000) |
117Florian | 3:32094530d55e | 85 | { |
117Florian | 3:32094530d55e | 86 | myled3 = 1; |
117Florian | 3:32094530d55e | 87 | return (0xffff*m_Volume) >> 16; |
117Florian | 3:32094530d55e | 88 | } |
117Florian | 3:32094530d55e | 89 | else |
117Florian | 3:32094530d55e | 90 | { |
117Florian | 3:32094530d55e | 91 | myled3 = 0; |
117Florian | 3:32094530d55e | 92 | return 0; |
117Florian | 3:32094530d55e | 93 | } |
117Florian | 3:32094530d55e | 94 | } |
117Florian | 3:32094530d55e | 95 | |
117Florian | 3:32094530d55e | 96 | void ::tick() |
117Florian | 3:32094530d55e | 97 | { |
117Florian | 3:32094530d55e | 98 | long long value=0; |
117Florian | 3:32094530d55e | 99 | |
117Florian | 3:32094530d55e | 100 | for (int i=0;i<OCCILATOR_PART_NUM;i++) |
117Florian | 3:32094530d55e | 101 | { |
117Florian | 3:32094530d55e | 102 | if (part[i]!=NULL) |
117Florian | 3:32094530d55e | 103 | { |
117Florian | 3:32094530d55e | 104 | value+=total_value_in_this_span + part[i]->tick(); |
117Florian | 3:32094530d55e | 105 | } |
117Florian | 3:32094530d55e | 106 | } |
117Florian | 3:32094530d55e | 107 | value = value>=0x10000 ? 0xffff : value; |
117Florian | 3:32094530d55e | 108 | sAnalogOut.write_u16(value); |
117Florian | 3:32094530d55e | 109 | myled4=value > 0x80000000; |
117Florian | 3:32094530d55e | 110 | } |