Added LED gate pin

src/AudioEffectSOS.h

@@ -38,6 +38,7 @@ public:
         BYPASS = 0,      ///< controls effect bypass
         GATE_TRIGGER,    ///< begins the gate sequence
         GATE_OPEN_TIME,  ///< controls how long it takes to open the gate
+        //GATE_HOLD_TIME,  ///< controls how long the gate stays open at unity
         GATE_CLOSE_TIME, ///< controls how long it takes to close the gate (release)
         FEEDBACK,        ///< controls the amount of feedback, more gives longer SOS sustain
         VOLUME,          ///< controls the output volume level
@@ -56,6 +57,8 @@ public:
 
     virtual ~AudioEffectSOS(); ///< Destructor
 
+    void setGateLedGpio(int pinId);
+
     // *** PARAMETERS ***
     void gateOpenTime(float milliseconds);
 
@@ -118,6 +121,7 @@ private:
     audio_block_t *m_previousBlock = nullptr;
     audio_block_t *m_blockToRelease  = nullptr;
     size_t m_maxDelaySamples = 0;
+    int m_gateLedPinId = -1;
 
     // Controls
     int m_midiConfig[NUM_CONTROLS][2]; // stores the midi parameter mapping

src/common/AudioDelay.cpp

@@ -97,6 +97,10 @@ audio_block_t* AudioDelay::getBlock(size_t index)
 
 size_t AudioDelay::getMaxDelaySamples()
 {
+    if (m_type == MemType::MEM_EXTERNAL) {
+        // update the max delay sample size
+        m_maxDelaySamples = (m_slot->size() / sizeof(int16_t)) - AUDIO_BLOCK_SAMPLES;
+    }
     return m_maxDelaySamples;
 }
 

src/common/ParameterAutomation.cpp

@@ -29,6 +29,7 @@ namespace BALibrary {
 ///////////////////////////////////////////////////////////////////////////////
 constexpr int LINEAR_SLOPE = 0;
 constexpr float EXPONENTIAL_K = 5.0f;
+constexpr float EXP_EXPONENTIAL_K = expf(EXPONENTIAL_K);
 
 template <class T>
 ParameterAutomation<T>::ParameterAutomation()
@@ -99,11 +100,18 @@ T ParameterAutomation<T>::getNextValue()
 
     m_currentValueX += m_slopeX;
     float value;
+    float returnValue;
 
     switch(m_function) {
     case Function::EXPONENTIAL :
-        // f(x) = exp(-k*x)
+
+        if (m_positiveSlope) {
+            // Growth: f(x) = exp(k*x) / exp(k)
+            value = expf(EXPONENTIAL_K*m_currentValueX) / EXP_EXPONENTIAL_K;
+        } else {
+            // Decay: f(x) = 1 - exp(-k*x)
             value = 1.0f - expf(-EXPONENTIAL_K*m_currentValueX);
+        }
         break;
     case Function::PARABOLIC :
         value = m_currentValueX*m_currentValueX;
@@ -122,7 +130,7 @@ T ParameterAutomation<T>::getNextValue()
         return m_endValue;
     }
 
-    float returnValue;
+
     if (m_positiveSlope) {
         returnValue = m_startValue + (m_scaleY*value);
     } else {
@@ -169,7 +177,7 @@ ParameterAutomationSequence<T>::~ParameterAutomationSequence()
 template <class T>
 void ParameterAutomationSequence<T>::setupParameter(int index, T startValue, T endValue, size_t durationSamples, typename ParameterAutomation<T>::Function function)
 {
-    Serial.println("setupParameter() called");
+    Serial.println(String("setupParameter() called with samples: ") + durationSamples);
     m_paramArray[index]->reconfigure(startValue, endValue, durationSamples, function);
     m_currentIndex = 0;
 }
@@ -177,7 +185,7 @@ void ParameterAutomationSequence<T>::setupParameter(int index, T startValue, T e
 template <class T>
 void ParameterAutomationSequence<T>::setupParameter(int index, T startValue, T endValue, float durationMilliseconds, typename ParameterAutomation<T>::Function function)
 {
-    Serial.println("setupParameter() called");
+    Serial.print(String("setupParameter() called with time: ")); Serial.println(durationMilliseconds, 6);
     m_paramArray[index]->reconfigure(startValue, endValue, durationMilliseconds, function);
     m_currentIndex = 0;
 }
@@ -208,6 +216,7 @@ T ParameterAutomationSequence<T>::getNextValue()
 
             if (m_currentIndex >= m_numStages) {
                 // Last stage already finished
+                Serial.println("Last stage finished");
                 m_running = false;
                 m_currentIndex = 0;
             } else {
@@ -223,15 +232,7 @@ T ParameterAutomationSequence<T>::getNextValue()
 template <class T>
 bool ParameterAutomationSequence<T>::isFinished()
 {
-    bool finished = true;
-    for (int i=0; i<m_numStages; i++) {
-        if (!m_paramArray[i]->isFinished()) {
-            finished = false;
-            break;
-        }
-    }
-    m_running = !finished;
-    return finished;
+    return !m_running;
 }
 
 // Template instantiation

src/effects/AudioEffectSOS.cpp

@@ -51,6 +51,12 @@ AudioEffectSOS::~AudioEffectSOS()
     if (m_memory) delete m_memory;
 }
 
+void AudioEffectSOS::setGateLedGpio(int pinId)
+{
+    m_gateLedPinId = pinId;
+    pinMode(static_cast<uint8_t>(m_gateLedPinId), OUTPUT);
+}
+
 void AudioEffectSOS::enable(void)
 {
     m_enable = true;
@@ -62,7 +68,7 @@ void AudioEffectSOS::enable(void)
     }
     m_delaySamples = m_maxDelaySamples;
     m_inputGateAuto.setupParameter(GATE_OPEN_STAGE, 0.0f, 1.0f, 1000.0f, ParameterAutomation<float>::Function::EXPONENTIAL);
-    m_inputGateAuto.setupParameter(GATE_HOLD_STAGE, 1.0f, 1.0f, 1000.0f, ParameterAutomation<float>::Function::HOLD);
+    m_inputGateAuto.setupParameter(GATE_HOLD_STAGE, 1.0f, 1.0f, m_maxDelaySamples, ParameterAutomation<float>::Function::HOLD);
     m_inputGateAuto.setupParameter(GATE_CLOSE_STAGE, 1.0f, 0.0f, 1000.0f, ParameterAutomation<float>::Function::EXPONENTIAL);
 }
 
@@ -261,6 +267,15 @@ void AudioEffectSOS::m_preProcessing (audio_block_t *out, audio_block_t *input,
     } else if (input) {
         memcpy(out->data, input->data, sizeof(int16_t) * AUDIO_BLOCK_SAMPLES);
     }
+
+    // Update the gate LED
+    if (m_gateLedPinId >= 0) {
+        if (m_inputGateAuto.isFinished()) {
+            digitalWriteFast(m_gateLedPinId, 0x0);
+        } else {
+            digitalWriteFast(m_gateLedPinId, 0x1);
+        }
+    }
 }
 
 void AudioEffectSOS::m_postProcessing(audio_block_t *out, audio_block_t *in)