ほぼ Arduino_EG のままである。LEDを付けただけ。

/*
 * Arduino EG - Envelope Generator with LED Indicators
 *
 * Updated on 2024.05.31
 */

#define UART_TRACE  (0)
#define PIN_CHECK   (0)

#define TITLE_STR1  ("Arduino EG - Envelope Generator")
#define TITLE_STR2  ("20240531")

// Pin definitions
const int ThresholdPin = A0;
const int AttackLevelPin = A1;
const int GateInPin = 3;
const int AttackPin = 5;
const int InvAttackPin = 6;
const int GateOutPin = 7;
const int A_LedPin = 8;
const int D_LedPin = 9;

// Envelope Generator states
enum EG_STATE {
  ST_ATTACK,
  ST_DECAY,
  ST_RELEASE
};

volatile EG_STATE state = ST_RELEASE;
volatile bool isStateChanged = true;
volatile EG_STATEprevState = ST_RELEASE;

// Attack time threshold: (2/3) * 1024
int attackThreshold = 683;

// Variables to store previous pin states
int prevGateInState = LOW;
int prevAttackState = LOW;
int prevInvAttackState = LOW;
int prevGateOutState = LOW;
int prevALedState = LOW;
int prevDLedState = LOW;

void gateIn()
{
  bool isGateOn = digitalRead(GateInPin);

#if (UART_TRACE)
  Serial.println(isGateOn);
#endif

  state = isGateOn ? ST_ATTACK : ST_RELEASE;
  isStateChanged = true;
}

void setup()
{
  pinMode(AttackPin, OUTPUT);
  pinMode(InvAttackPin, OUTPUT);
  pinMode(GateOutPin, OUTPUT);
  pinMode(A_LedPin, OUTPUT);
  pinMode(D_LedPin, OUTPUT);

  pinMode(GateInPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(GateInPin), gateIn, CHANGE);

#if (PIN_CHECK)
  pinMode(10, OUTPUT);
#endif

#if (UART_TRACE)
  Serial.begin(115200);
  Serial.println(TITLE_STR1);
  Serial.println(TITLE_STR2);
  delay(1000);
#endif
}

void updateState()
{
  // Update the state of pins and add comments to show state changes
  switch (state) {
    case ST_ATTACK:
      // Changing state to ST_ATTACK
      digitalWrite(A_LedPin, HIGH);  // Turn on A_LED
      digitalWrite(D_LedPin, LOW);   // Turn off D_LED
      digitalWrite(AttackPin, HIGH); // Turn on Attack
      digitalWrite(InvAttackPin, LOW); // Turn off InvAttack
      digitalWrite(GateOutPin, HIGH);  // Turn on GateOut
      break;
    case ST_DECAY:
      // Changing state to ST_DECAY
      digitalWrite(A_LedPin, LOW);    // Turn off A_LED
      digitalWrite(D_LedPin, HIGH);   // Turn on D_LED
      digitalWrite(AttackPin, LOW);   // Turn off Attack
      digitalWrite(InvAttackPin, HIGH); // Turn on InvAttack
      // GateOutPin remains unchanged
      break;
    case ST_RELEASE:
      // Changing state to ST_RELEASE
      digitalWrite(A_LedPin, LOW);    // Turn off A_LED
      digitalWrite(D_LedPin, LOW);    // Turn off D_LED
      digitalWrite(AttackPin, LOW);   // Turn off Attack
      digitalWrite(InvAttackPin, HIGH); // Turn on InvAttack
      digitalWrite(GateOutPin, LOW);  // Turn off GateOut
      break;
  }
}

void loop()
{
#if (PIN_CHECK)
  digitalWrite(10, HIGH);
#endif

  attackThreshold = analogRead(AttackLevelPin);
  int th = analogRead(ThresholdPin);

  if (state == ST_ATTACK && th > attackThreshold) {
    state = ST_DECAY;
    isStateChanged = true;
  }

#if (UART_TRACE)
  // Check for pin state changes and print if any
  bool pinStateChanged = false;

  int currentGateInState = digitalRead(GateInPin);
  int currentAttackState = digitalRead(AttackPin);
  int currentInvAttackState = digitalRead(InvAttackPin);
  int currentGateOutState = digitalRead(GateOutPin);
  int currentALedState = digitalRead(A_LedPin);
  int currentDLedState = digitalRead(D_LedPin);

  if (currentGateInState != prevGateInState ||
      currentAttackState != prevAttackState ||
      currentInvAttackState != prevInvAttackState ||
      currentGateOutState != prevGateOutState ||
      currentALedState != prevALedState ||
      currentDLedState != prevDLedState) {
    pinStateChanged = true;
  }

  if (pinStateChanged) {
    Serial.print("AtkLvl: ");
    Serial.print(attackThreshold);
    Serial.print("\tTh: ");
    Serial.print(th);
    Serial.print("\t\tGIn: ");
    Serial.print(currentGateInState);
    Serial.print(" Atk: ");
    Serial.print(currentAttackState);
    Serial.print(" InvAtk: ");
    Serial.print(currentInvAttackState);
    Serial.print(" GOut: ");
    Serial.print(currentGateOutState);
    Serial.print(" A_LED: ");
    Serial.print(currentALedState);
    Serial.print(" D_LED: ");
    Serial.print(currentDLedState);
    Serial.print(" State: ");
    Serial.println(state);

    // Update previous states
    prevGateInState = currentGateInState;
    prevAttackState = currentAttackState;
    prevInvAttackState = currentInvAttackState;
    prevGateOutState = currentGateOutState;
    prevALedState = currentALedState;
    prevDLedState = currentDLedState;
  }
#endif

  if (isStateChanged) {
    isStateChanged = false;
    updateState();
  }

#if (PIN_CHECK)
  digitalWrite(10, LOW);
#endif
}
    
    

ADSR特性

ブレッドボードで組んだ試験回路では、ちゃんとADSRの個々の特性が出来上がっていたのに、基板にもってくるとなぜがARになってしまった。