Ryo Od
Nucleo F446 Envelope Generator
Revision 0:c5e94349541f, committed 2018-06-30
- Comitter:
- ryood
- Date:
- Sat Jun 30 08:51:09 2018 +0000
- Commit message:
- first commit
Changed in this revision
diff -r 000000000000 -r c5e94349541f EnvelopeADSR.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/EnvelopeADSR.h Sat Jun 30 08:51:09 2018 +0000
@@ -0,0 +1,141 @@
+/*
+ * ADSR Type Envelope Class
+ *
+ * 2018.06.28
+ *
+ */
+
+#ifndef _ENVELOPE_ADSR_H_
+#define _ENVELOPE_ADSR_H_
+
+class EnvelopeADSR
+{
+private:
+ enum EnvelopeState {
+ ST_ATTACK,
+ ST_DECAY,
+ ST_SUSTAIN,
+ ST_RELEASE
+ };
+
+public:
+ EnvelopeADSR()
+ {
+ count = 0;
+ amplitude = 0;
+ setADSR(0, 0, 0.0f, 0);
+ }
+
+ void setADSR(int _attack, int _decay, float _sustain, int _release)
+ {
+ attack = _attack;
+ decay = _decay;
+ sustain = _sustain;
+ release = _release;
+
+ if (attack != 0) {
+ attackRatio = 1.0f / attack;
+ }
+ else {
+ attackRatio = 0.0f;
+ }
+ if (decay != 0) {
+ decayRatio = -(1.0f - sustain) / decay;
+ }
+ else {
+ decayRatio = 0.0f;
+ }
+ if (release != 0) {
+ releaseRatio = -sustain / release;
+ }
+ else {
+ releaseRatio = 0.0f;
+ }
+ }
+
+ void gateOn()
+ {
+ isGateOn = true;
+ count = 0;
+ amplitude = 0.0f;
+ state = ST_ATTACK;
+ }
+
+ void gateOff()
+ {
+ isGateOn = false;
+ state = ST_RELEASE;
+ }
+
+ float getAmplitude()
+ {
+ return amplitude;
+ }
+
+ long getCount()
+ {
+ return count;
+ }
+
+ int getState()
+ {
+ return state;
+ }
+
+ float tick()
+ {
+ float currentAmplitude = amplitude;
+
+ switch (state) {
+ case ST_ATTACK:
+ amplitude += attackRatio;
+ break;
+ case ST_DECAY:
+ amplitude += decayRatio;
+ break;
+ case ST_SUSTAIN:
+ // do nothing
+ break;
+ case ST_RELEASE:
+ amplitude += releaseRatio;
+ break;
+ }
+
+ // Limiter
+ if (amplitude < 0.0f) {
+ amplitude = 0.0f;
+ }
+ else if (amplitude > 1.0f) {
+ amplitude = 1.0f;
+ }
+
+ count++;
+ if (count < attack) {
+ state = ST_ATTACK;
+ } else if (count < attack + decay) {
+ state = ST_DECAY;
+ } else if (isGateOn) {
+ state = ST_SUSTAIN;
+ }
+
+ return currentAmplitude;
+ }
+
+private:
+ int attack;
+ int decay;
+ float sustain;
+ int release;
+
+ float attackRatio;
+ float decayRatio;
+ float releaseRatio;
+
+ long count;
+ bool isGateOn;
+ EnvelopeState state;
+
+ float amplitude;
+};
+
+#endif //_ENVELOPE_ADSR_H_
diff -r 000000000000 -r c5e94349541f main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Jun 30 08:51:09 2018 +0000
@@ -0,0 +1,69 @@
+#include "mbed.h"
+#include "EnvelopeADSR.h"
+
+#define TITLE_STR1 ("Nucleo F446 EG")
+#define TITLE_STR2 ("2018.06.28")
+
+// Internal DAC
+AnalogOut Aout0(PA_4);
+
+// ADSR POT
+AnalogIn Ain0(PC_2);
+AnalogIn Ain1(PC_3);
+AnalogIn Ain2(PC_1);
+AnalogIn Ain3(PC_0);
+AnalogIn Ain4(PB_0);
+AnalogIn Ain5(PA_1);
+AnalogIn Ain6(PA_0);
+AnalogIn Ain7(PC_4);
+
+// Envelope
+EnvelopeADSR envelope;
+const int sampleMagnify = 10000; // POTの読み取り値が1.0fの場合のA/D/Rの値
+
+// Gate
+InterruptIn gateIn(USER_BUTTON);
+
+void gateInterruptRise() {
+ envelope.gateOff();
+}
+
+void gateInterruptFall() {
+ envelope.gateOn();
+}
+
+int main()
+{
+ printf("\r\n%s %s \r\n", TITLE_STR1, TITLE_STR2);
+
+ gateIn.rise(&gateInterruptRise);
+ gateIn.fall(&gateInterruptFall);
+
+ while(1) {
+ float a0 = Ain0.read();
+ float a1 = Ain1.read();
+ float a2 = Ain2.read();
+ float a3 = Ain3.read();
+ float a4 = Ain4.read();
+ float a5 = Ain5.read();
+ float a6 = Ain6.read();
+ float a7 = Ain7.read();
+
+ // Envelope 1
+ int a = a0 * sampleMagnify;
+ int d = a1 * sampleMagnify;
+ float s = a2;
+ int r = a3 * sampleMagnify;
+
+ envelope.setADSR(a, d, s, r);
+ float amplitude = envelope.tick();
+
+ Aout0.write(amplitude);
+
+ /*
+ printf("%.4f\t%.2f\t%.2f\t%.2f\t%.2f\t\r\n",
+ amplitude, a0, a1, a2, a3);
+ */
+
+ }
+}
diff -r 000000000000 -r c5e94349541f mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Jun 30 08:51:09 2018 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/a7c7b631e539 \ No newline at end of file