
[PWMDAC_Synth - PWM DAC synthesizer library for Arduino]

ver.20150916

Arduinoœ삷ȈՃVZTCUCułB

https://osdn.jp/users/kamide/pf/PWMDAC_Synth/wiki/FrontPage

 CAmiDion

  http://www.yk.rim.or.jp/~kamide/music/chordhelper/hardware/

̂Q@ȍ~ŎCûłB


ArduinoŊy낤ƂāAȖɂԂƂ͂܂񂩁H

EoȂ tone() 葁ǁAaoȂc

EanalogWrite()  PWM o͂ĂApXg̎g490Hz
  Ⴗ邩A1kHzỎȂď悹ȂAǂ悤c

ȖAAVR̃vXP[ij̐ݒς
pXg̎gőɂΈCɉB

̃CúAKő̎Ŕ^C}[荞݂ŁA
̏uԂ̔g̍ɉAPWM̃pX𖈉񃊃A^C
fXV邱ƂɂA`głȂFXȔg`̉o͂܂B

O`bvȂ Arduino {̂̂̂
VZTCỦƂɊpĂB


CXg[

WJ PWMDAC_Synth tH_L̃tH_
uŃCXg[ł܂B

	}ChLg\Arduino\libraries\

uAArduino IDE ̃j[ [t@C]  [XPb`̗] 
PWMDAC_Synth 邱ƂmFĂB


g

	// KvɉAPWMDAC_Synth.h CN[hO #define ŉLwł܂B
	#define PWMDAC_OUTPUT_PIN  3 // PWMo̓sԍiȗFLQƁj
	#define PWMDAC_POLYPHONY   6 // iȗFftHg6daj
	#define PWMDAC_NOTE_A_FREQUENCY 440  // Ã`[jOgiȗFftHg440Hzj

	#include <PWMDAC_Synth.h>
	PWMDAC_INSTANCE; // CX^XiK{j

	setup() {
		PWMDACSynth::setup(); // iK{j
	}

	loop() {
		PWMDACSynth::update(); // ԍXViK{j
	}


PWMDACSynth::update() ́AȂǂADSRGx[v`
݈ʒui߂AW[Vɂĕω鎞ԂƂ
gXV邽߂̊֐łBĂяopx͎ŃJE^
pӂȂǂ̕@ŃRg[ĂB

t̃TvXPb`iexamples/*.inojɎႪ܂B
dqy CAmiDion ȂǁAۂ PWMDAC_Synth gĂXPb`
QlɂĂB

̑Ag֐ɂĂ PWMDAC_Synth.h QƂĂB


o̓s(PWM)

	PWMo͗pƂĎwłsԍ 3,9,10,11 ̂ꂩłB
	ftHg̃sԍ 3 łB

	3,11 Iꍇ TIMER2A9,10 Iꍇ TIMER1 g܂B

	ȂA5,6  PWM [qłĂwł܂B
	 TIMER0 p ISR()  Arduino  millis() Ȃǂ̂߂ɎgĂ
	Ē`łȂ߂łB

	PWM o̓śÂ܂ PC  LINE IN ȂǂɂȂłꉞ͕܂A
	[pXtB^ŉgʂ悤ɂƁA蕷₷Ȃ܂B


MIDI`l

	PWM_SYNTH ̃\bhŁA

		MIDI`lԍ(1`16)  MIDI`lւ̃|C^

	𑊌ݕϊł܂B

	MidiChannel *getChannel(char channel)
	char getChannel(MidiChannel *cp)

	MIDI`lւ̃|C^́Aɔg`Gx[vp[^
	Aȍ~̉oȍ~ɔfp[^̐ݒɎg܂B

	NOTE OFFANOTE ONAsb`xh́AA^Cv̂
	PWMDACSynth ĂяoĂB

	Ƀsb`xh́AMidiChannel::setPitchBend() Őݒ肵ł
	oĂ鉹ɃA^Cɔf܂B
	PWMDACSynth::pitchBend() g΃A^Cɔf܂B


MIDI֐

	PWM_SYNTH ÓIIuWFNgɂ́AMIDICu MIDI.setHandleXxxx() 
	ڎwł悤Ȁ^킹֐pӂĂ܂B

	AڑMIDIfoCXɂẮANOTE OFF ̑
	velocity=0  NOTE ON 𑗂Ă邱Ƃ̂ŁȀꍇ
	NOTE OFF ĂяoƂHvKvɂȂ܂B

	MIDI`lԍ́AMIDICuɍ킹 1`16 ͈̔͂
	w肷悤ɍĂ܂B


FύX
	vO`FWɂ͑ΉĂ܂B
	ɂɃGx[vp[^Ɣg`w肵ĉFύX܂B
	iMidiChannel NX wavetable  env_param Ŏw肵܂j

	Gx[vp[^ EnvelopeParam \̂čs܂B

	Eattack_speed - A^bNxiقǃA^bN^Cj
	Edecay_time - fBPCԁi傫قǃm[gǏj
	Esustain_level - TXeBxi~܂ƈێ鉹ʁj
	Erelease_time - [Xԁi傫قǃm[gIťj

	ȂA̎Ԃ loop()  update() Ăяopxɂĕς܂B

	g`́APROGMEM zivf256byte^Ɍjw肵čs܂B

	aɂĉdȂƂAx 255 𒴂
	̌ɂȂ܂BiftHgFUdaj
	߂̒lŔg`悤ɂĂB
	ȂAPWMDACSynth:: ɂgݍ݂̔g`z񂪂̂
	w肷ƊȒPłB

	EsineWavetable[]	g
	EsquareWavetable[]	`g
	EtriangleWavetable[]	Opg
	EsawtoothWavetable[]	̂g
	EshepardToneSineWavetable[]	g̖KiVFp[hg[j

[eBeB
	byte musicalMod7(char x)
	byte musicalMod12(char x)
		ꂼ7Ŋ]A12Ŋ]Ԃ܂B
		% ZqƈႢA^ĂŕԂ܂B
		Iɂ̓rbgZƉZōɌvZ܂B
		ǨvZɕ֗łB

	byte log2(unsigned int x)
		QƂΐA_ȉ؎̂ĂŕԂ܂B
		y = log2(x)  x = 1 << y ͋t֐̊֌WɂȂ܂B

	int musicalConstrain12(int note, int min_note, int max_note)
		Arduino  constrain() KpɎ֐B
		note  min_note ` max_note ̉ɂ
		note ̂܂ܕԂ܂B͂ݏoĂꍇA
		KςɃIN^[uʒuς邱ƂɂA
		͈͂Ɏ܂悤܂B


ҁF悵 - Akiyoshi Kamide
	http://www.yk.rim.or.jp/~kamide/
