Ryo Od / Mbed 2 deprecated KIK01_Proto05

KIK 01 Prototype 05

Dependencies:   AverageMCP3008 mbed-rtos mbed mcp3008

Fork of KIK01_Proto03 by Ryo Od

main.cpp@2:8dff77a1ee4d, 2017-06-04 (annotated)

Committer:
ryood
Date:
Sun Jun 04 05:53:01 2017 +0000
Revision:
2:8dff77a1ee4d
Parent:
1:f9b967ae26e4
Child:
3:f89b400cfe57
Ticker wave and envelope generation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ryood 0:2dcec10e9199 1 #include "mbed.h"
ryood 0:2dcec10e9199 2 #include "rtos.h"
ryood 0:2dcec10e9199 3
ryood 0:2dcec10e9199 4 #define TITLE_STR1 ("KIK01 Kick Machine")
ryood 0:2dcec10e9199 5 #define TITLE_STR2 ("20170604")
ryood 0:2dcec10e9199 6
ryood 0:2dcec10e9199 7 #define PI_F (3.1415926f)
ryood 2:8dff77a1ee4d 8 #define SAMPLING_RATE (96000)
ryood 0:2dcec10e9199 9 #define SAMPLING_PERIOD (1.0f/SAMPLING_RATE)
ryood 0:2dcec10e9199 10
ryood 0:2dcec10e9199 11 #define ENVELOPE_PERIOD (500)
ryood 0:2dcec10e9199 12 #define FREQUENCY_ATTACK (5)
ryood 0:2dcec10e9199 13 #define FREQUENCY_RELEASE (300)
ryood 0:2dcec10e9199 14 #define AMPLITUDE_ATTACK (50)
ryood 0:2dcec10e9199 15 #define AMPLITUDE_RELEASE (200)
ryood 0:2dcec10e9199 16
ryood 0:2dcec10e9199 17 AnalogOut Dac1(PA_4);
ryood 0:2dcec10e9199 18
ryood 0:2dcec10e9199 19 class EnvelopeAR {
ryood 0:2dcec10e9199 20 public:
ryood 0:2dcec10e9199 21 EnvelopeAR(int _attack, int _release, float _v0, float _v1, float _v2, float _attackTauRatio=0.36f, float _releaseTauRatio=0.36f) :
ryood 0:2dcec10e9199 22 amplitude(_v0),
ryood 0:2dcec10e9199 23 v0(_v0),
ryood 0:2dcec10e9199 24 v1(_v1),
ryood 0:2dcec10e9199 25 v2(_v2),
ryood 0:2dcec10e9199 26 vLast(_v0),
ryood 0:2dcec10e9199 27 attackTauRatio(_attackTauRatio),
ryood 0:2dcec10e9199 28 releaseTauRatio(_releaseTauRatio)
ryood 0:2dcec10e9199 29 {
ryood 0:2dcec10e9199 30 setAttack(_attack);
ryood 0:2dcec10e9199 31 setRelease(_release);
ryood 0:2dcec10e9199 32 }
ryood 0:2dcec10e9199 33
ryood 0:2dcec10e9199 34 ~EnvelopeAR() {}
ryood 0:2dcec10e9199 35
ryood 0:2dcec10e9199 36 void setAttack(int _attack) {
ryood 0:2dcec10e9199 37 attack = _attack;
ryood 0:2dcec10e9199 38 tau0 = attack * attackTauRatio;
ryood 0:2dcec10e9199 39 }
ryood 0:2dcec10e9199 40 int getAttack() { return attack; }
ryood 0:2dcec10e9199 41
ryood 0:2dcec10e9199 42 void setRelease(int _release) {
ryood 0:2dcec10e9199 43 release = _release;
ryood 0:2dcec10e9199 44 tau1 = release * releaseTauRatio;
ryood 0:2dcec10e9199 45 }
ryood 0:2dcec10e9199 46 int getRelease() { return release; }
ryood 0:2dcec10e9199 47
ryood 0:2dcec10e9199 48 void setAttackTauRatio(float _attackTauRatio) { attackTauRatio = _attackTauRatio; }
ryood 0:2dcec10e9199 49 float getAttackTauRatio() { return attackTauRatio; }
ryood 0:2dcec10e9199 50
ryood 0:2dcec10e9199 51 void setReleaseTauRatio(float _releaseTauRatio) { releaseTauRatio = _releaseTauRatio; }
ryood 0:2dcec10e9199 52 float getReleaseTauRatio() { return releaseTauRatio; }
ryood 0:2dcec10e9199 53
ryood 0:2dcec10e9199 54 void setV0(float _v0) { v0 = _v0; }
ryood 0:2dcec10e9199 55 float getV0() { return v0; }
ryood 0:2dcec10e9199 56 void setV1(float _v1) { v1 = _v1; }
ryood 0:2dcec10e9199 57 float getV1() { return v1; }
ryood 0:2dcec10e9199 58 void setV2(float _v2) { v2 = _v2; }
ryood 0:2dcec10e9199 59 float getV2() { return v2; }
ryood 0:2dcec10e9199 60
ryood 0:2dcec10e9199 61 float getAmplitude() { return amplitude; }
ryood 0:2dcec10e9199 62 float getAmplitude(int tick) {
ryood 0:2dcec10e9199 63 if (tick < attack) {
ryood 0:2dcec10e9199 64 // attackの処理
ryood 0:2dcec10e9199 65 amplitude = v0 + (v1 - v0) * (1 - expf(-(float)tick / tau0));
ryood 0:2dcec10e9199 66 vLast = amplitude;
ryood 0:2dcec10e9199 67 }
ryood 0:2dcec10e9199 68 else {
ryood 0:2dcec10e9199 69 // releaseの処理
ryood 0:2dcec10e9199 70 amplitude = (vLast - v2) * (expf(-(float)(tick - attack) / tau1)) + v2;
ryood 0:2dcec10e9199 71 }
ryood 0:2dcec10e9199 72 return amplitude;
ryood 0:2dcec10e9199 73 }
ryood 0:2dcec10e9199 74
ryood 0:2dcec10e9199 75 private:
ryood 0:2dcec10e9199 76 int attack;
ryood 0:2dcec10e9199 77 int release;
ryood 0:2dcec10e9199 78 float amplitude;
ryood 0:2dcec10e9199 79 float v0;
ryood 0:2dcec10e9199 80 float v1;
ryood 0:2dcec10e9199 81 float v2;
ryood 0:2dcec10e9199 82 float vLast;
ryood 0:2dcec10e9199 83 float tau0;
ryood 0:2dcec10e9199 84 float tau1;
ryood 0:2dcec10e9199 85 float attackTauRatio;
ryood 0:2dcec10e9199 86 float releaseTauRatio;
ryood 0:2dcec10e9199 87 };
ryood 0:2dcec10e9199 88
ryood 0:2dcec10e9199 89 EnvelopeAR envelopeFrequency(
ryood 0:2dcec10e9199 90 FREQUENCY_ATTACK, FREQUENCY_RELEASE, 880.0f, 120.0f, 40.0f, 0.36f, 0.1f);
ryood 0:2dcec10e9199 91 EnvelopeAR envelopeAmplitude(AMPLITUDE_ATTACK, AMPLITUDE_RELEASE, 0.9f, 1.0f, 0.0f);
ryood 0:2dcec10e9199 92
ryood 2:8dff77a1ee4d 93 int ticks;
ryood 2:8dff77a1ee4d 94 int envelopeTicks;
ryood 0:2dcec10e9199 95 float frequency;
ryood 0:2dcec10e9199 96 float phi;
ryood 0:2dcec10e9199 97 float phiDelta;
ryood 0:2dcec10e9199 98 float amplitude;
ryood 0:2dcec10e9199 99
ryood 0:2dcec10e9199 100 void generateWave()
ryood 0:2dcec10e9199 101 {
ryood 0:2dcec10e9199 102 phi += phiDelta;
ryood 0:2dcec10e9199 103 if (phi >= 1.0f) {
ryood 0:2dcec10e9199 104 phi -= 2.0f;
ryood 0:2dcec10e9199 105 }
ryood 0:2dcec10e9199 106 float level = sinf(PI_F * phi) * amplitude;
ryood 1:f9b967ae26e4 107
ryood 0:2dcec10e9199 108 Dac1.write((level + 1.0f) / 2.0f);
ryood 0:2dcec10e9199 109 }
ryood 0:2dcec10e9199 110
ryood 0:2dcec10e9199 111 void generateEnvelope()
ryood 0:2dcec10e9199 112 {
ryood 0:2dcec10e9199 113 // Frequency Envelope
ryood 0:2dcec10e9199 114 frequency = envelopeFrequency.getAmplitude(envelopeTicks);
ryood 0:2dcec10e9199 115 phiDelta = 2.0f * frequency / SAMPLING_RATE;
ryood 0:2dcec10e9199 116
ryood 0:2dcec10e9199 117 // Amplitude Envelope
ryood 0:2dcec10e9199 118 amplitude = envelopeAmplitude.getAmplitude(envelopeTicks);
ryood 0:2dcec10e9199 119
ryood 0:2dcec10e9199 120 envelopeTicks++;
ryood 0:2dcec10e9199 121 if (envelopeTicks == ENVELOPE_PERIOD) {
ryood 0:2dcec10e9199 122 envelopeTicks = 0;
ryood 0:2dcec10e9199 123 }
ryood 0:2dcec10e9199 124 }
ryood 0:2dcec10e9199 125
ryood 2:8dff77a1ee4d 126 void update()
ryood 2:8dff77a1ee4d 127 {
ryood 2:8dff77a1ee4d 128 ticks--;
ryood 2:8dff77a1ee4d 129 if (ticks == 0) {
ryood 2:8dff77a1ee4d 130 ticks = SAMPLING_RATE / 1000;
ryood 2:8dff77a1ee4d 131 generateEnvelope();
ryood 2:8dff77a1ee4d 132 }
ryood 2:8dff77a1ee4d 133 generateWave();
ryood 2:8dff77a1ee4d 134 }
ryood 2:8dff77a1ee4d 135
ryood 0:2dcec10e9199 136 int main()
ryood 0:2dcec10e9199 137 {
ryood 0:2dcec10e9199 138 printf("%s %s\r\n", TITLE_STR1, TITLE_STR2);
ryood 0:2dcec10e9199 139
ryood 0:2dcec10e9199 140 frequency = 1000.0f;
ryood 0:2dcec10e9199 141 phiDelta = 2.0f * frequency / SAMPLING_RATE;
ryood 0:2dcec10e9199 142 amplitude = 1.0f;
ryood 0:2dcec10e9199 143
ryood 2:8dff77a1ee4d 144 ticks = SAMPLING_RATE / 1000;
ryood 2:8dff77a1ee4d 145 envelopeTicks = 0;
ryood 1:f9b967ae26e4 146
ryood 2:8dff77a1ee4d 147 Ticker samplingTicker;
ryood 2:8dff77a1ee4d 148 samplingTicker.attach(&update, SAMPLING_PERIOD);
ryood 2:8dff77a1ee4d 149
ryood 1:f9b967ae26e4 150 for (;;) {}
ryood 0:2dcec10e9199 151 }