Feature/update physical controls (#4)

* Added intepolated delay capability to AudioDelay class

* renamed testing verision of AudioEffectAnalogDelay.cpp

* Updates to the internal functions in BAPhyscontrols for better switch/pot support

src/BAPhysicalControls.h

@@ -58,9 +58,11 @@ class DigitalInput : public Bounce {
 public:
 	/// Create an input where digital low is return true. Most switches ground when pressed.
 	DigitalInput() : m_isPolarityInverted(true) {}
+
 	/// Create an input and specify if input polarity is inverted.
 	/// @param isPolarityInverted when false, a high voltage on the pin returns true, 0V returns false.
 	DigitalInput(bool isPolarityInverted) : m_isPolarityInverted(isPolarityInverted) {}
+
 	/// Read the state of the pin according to the polarity
 	/// @returns true when the input should be interpreted as the switch is closed, else false.
 	bool read() { return Bounce::read() != m_isPolarityInverted; } // logical XOR to conditionally invert polarity
@@ -69,8 +71,26 @@ public:
 	/// @param polarity when true, a low voltage on the pin is considered true by read(), else false.
 	void setPolarityInverted(bool polarity) { m_isPolarityInverted = polarity; }
 
+	/// Check if input has toggled from low to high to low by looking for falling edges
+	/// @returns true if the switch has toggled
+	bool hasInputToggled();
+
+	/// Check if the input is asserted
+	/// @returns true if the switch is held
+	bool isInputAssert();
+
+	/// Get the raw input value (ignores polarity inversion)
+	/// @returns returns true is physical pin is high, else false
+	bool getPinInputValue();
+
+	/// Store the current switch state and return true if it has changed.
+	/// @param switchState variable to store switch state in
+	/// @returns true when switch stage has changed since last check
+	bool hasInputChanged(bool &switchState);
+
 private:
 	bool m_isPolarityInverted;
+	bool m_isPushed;
 };
 
 /// Convenience class for handling an analog pot as a control. When calibrated,
@@ -93,8 +113,7 @@ public:
 	/// @param minCalibration See Potentiometer::calibrate()
 	/// @param maxCalibration See Potentiometer::calibrate()
 	/// @param swapDirection Optional param. See Potentiometer::calibrate()
-	Potentiometer(uint8_t analogPin, unsigned minCalibration, unsigned maxCalibration, bool swapDirection = false)
-        : m_pin(analogPin), m_swapDirection(swapDirection), m_minCalibration(minCalibration), m_maxCalibration(maxCalibration) {}
+	Potentiometer(uint8_t analogPin, unsigned minCalibration, unsigned maxCalibration, bool swapDirection = false);
 
 	/// Get new value from the pot.
 	/// @param value reference to a float, the new value will be written here. Value is between 0.0 and 1.0f.
@@ -117,6 +136,8 @@ public:
 	/// @param filterValue typical values are 0.80f to 0.95f
 	void setFeedbackFitlerValue(float fitlerValue);
 
+	void setCalibrationValues(unsigned min, unsigned max, bool swapDirection);
+
 	/// Call this static function before creating the object to obtain calibration data. The sequence
 	/// involves prompts over the Serial port.
 	/// @details E.g. call Potentiometer::calibrate(PIN). See BAExpansionCalibrate.ino in the library examples.
@@ -131,6 +152,10 @@ private:
 	unsigned m_maxCalibration;          ///< stores the max pot value
 	unsigned m_lastValue = 0;           ///< stores previous value
 	float m_feedbackFitlerValue = 0.9f; ///< feedback value for POT filter
+	float m_thresholdFactor = 0.05f;    ///< threshold factor causes values pot to saturate faster at the limits, default is 5%
+    unsigned m_minCalibrationThresholded; ///< stores the min pot value after thresholding
+    unsigned m_maxCalibrationThresholded; ///< stores the max pot value after thresholding
+    unsigned m_rangeThresholded;          ///< stores the range of max - min after thresholding
 };
 
 /// Convenience class for rotary (quadrature) encoders. Uses Arduino Encoder under the hood.
@@ -241,6 +266,18 @@ public:
 	/// @returns true if the pot value has changed since previous check, otherwise false
 	bool checkPotValue(unsigned handle, float &value);
 
+	/// Get the raw uncalibrated value from the pot
+	/// @returns uncalibrated pot value
+	int getPotRawValue(unsigned handle);
+
+	/// Override the calibration values with new values
+	/// @param handle handle the handle that was provided previously by calling addPot()
+	/// @param min the min raw value for the pot
+	/// @param max the max raw value for the pot
+	/// @param swapDirection when true, max raw value will mean min control value
+	/// @returns false when handle is out of range
+	bool setCalibrationValues(unsigned handle, unsigned min, unsigned max, bool swapDirection);
+
 	/// Check if the switch has been toggled since last call
 	/// @param handle the handle that was provided previously by calling addSwitch()
 	/// @returns true if the switch changed state, otherwise false
@@ -254,7 +291,13 @@ public:
     /// Get the value of the switch
 	/// @param handle the handle that was provided previously by calling addSwitch()
     /// @returns the value at the switch pin, either 0 or 1.
-    int getSwitchValue(unsigned handle);
+    bool getSwitchValue(unsigned handle);
+
+    /// Determine if a switch has changed value
+    /// @param handle the handle that was provided previously by calling addSwitch()
+    /// @param switchValue a boolean to store the new switch value
+    /// @returns true if the switch has changed
+    bool hasSwitchChanged(unsigned handle, bool &switchValue);
 
 private:
   std::vector<Potentiometer> m_pots;     ///< a vector of all added pots

src/peripherals/BAPhysicalControls.cpp

@@ -117,15 +117,24 @@ bool BAPhysicalControls::checkPotValue(unsigned handle, float &value) {
 	return m_pots[handle].getValue(value);
 }
 
+int BAPhysicalControls::getPotRawValue(unsigned handle)
+{
+    if (handle >= m_pots.size()) { return false;} // handle is greater than number of pots
+    return m_pots[handle].getRawValue();
+}
+
+bool BAPhysicalControls::setCalibrationValues(unsigned handle, unsigned min, unsigned max, bool swapDirection)
+{
+    if (handle >= m_pots.size()) { return false;} // handle is greater than number of pots
+    m_pots[handle].setCalibrationValues(min, max, swapDirection);
+    return true;
+}
+
 bool BAPhysicalControls::isSwitchToggled(unsigned handle) {
 	if (handle >= m_switches.size()) { return 0; } // handle is greater than number of switches
 	DigitalInput &sw = m_switches[handle];
 
-	if (sw.update() && sw.fallingEdge()) {
-	  return true;
-	} else {
-	  return false;
-	}
+	return sw.hasInputToggled();
 }
 
 bool BAPhysicalControls::isSwitchHeld(unsigned handle)
@@ -133,15 +142,10 @@ bool BAPhysicalControls::isSwitchHeld(unsigned handle)
 	if (handle >= m_switches.size()) { return 0; } // handle is greater than number of switches
 	DigitalInput &sw = m_switches[handle];
 
-	sw.update();
-	if (sw.read()) {
-		return true;
-	} else {
-		return false;
-	}
+	return sw.isInputAssert();
 }
 
-int BAPhysicalControls::getSwitchValue(unsigned handle)
+bool BAPhysicalControls::getSwitchValue(unsigned handle)
 {
 	if (handle >= m_switches.size()) { return 0; } // handle is greater than number of switches
 	DigitalInput &sw = m_switches[handle];
@@ -149,8 +153,66 @@ int BAPhysicalControls::getSwitchValue(unsigned handle)
 	return sw.read();
 }
 
+bool BAPhysicalControls::hasSwitchChanged(unsigned handle, bool &switchValue)
+{
+    if (handle >= m_switches.size()) { return 0; } // handle is greater than number of switches
+    DigitalInput &sw = m_switches[handle];
+
+    return sw.hasInputChanged(switchValue);
+}
+
+///////////////////////////
+// DigitalInput
 ///////////////////////////
+bool DigitalInput::hasInputToggled() {
+
+    update();
+    if (fell() && (m_isPolarityInverted == false)) {
+        // switch fell and polarity is not inverted
+        return true;
+    } else if (rose() && (m_isPolarityInverted == true)) {
+        // switch rose and polarity is inveretd
+        return true;
+    } else {
+        return false;
+    }
+}
 
+bool DigitalInput::isInputAssert()
+{
+    update();
+    // if polarity is inverted, return the opposite state
+    bool retValue = Bounce::read() ^ m_isPolarityInverted;
+    return retValue;
+}
+
+bool DigitalInput::getPinInputValue()
+{
+    update();
+    return Bounce::read();
+}
+
+bool DigitalInput::hasInputChanged(bool &switchState)
+{
+    update();
+    if (rose()) {
+        // return true if not inverted
+        switchState = m_isPolarityInverted ? false : true;
+        return true;
+    } else if (fell()) {
+        // return false if not inverted
+        switchState = m_isPolarityInverted ? true : false;
+        return true;
+    } else {
+        // return current value
+        switchState = Bounce::read() != m_isPolarityInverted;
+        return false;
+    }
+}
+
+///////////////////////////
+// DigitalOutput
+///////////////////////////
 void DigitalOutput::set(int val) {
 	m_val = val;
 	digitalWriteFast(m_pin, m_val);
@@ -161,6 +223,16 @@ void DigitalOutput::toggle(void) {
 	digitalWriteFast(m_pin, m_val);
 }
 
+///////////////////////////
+// Potentiometer
+///////////////////////////
+Potentiometer::Potentiometer(uint8_t analogPin, unsigned minCalibration, unsigned maxCalibration, bool swapDirection)
+        : m_pin(analogPin), m_swapDirection(swapDirection), m_minCalibration(minCalibration), m_maxCalibration(maxCalibration)
+{
+    adjustCalibrationThreshold(m_thresholdFactor); // Calculate the thresholded values
+}
+
+
 void Potentiometer::setFeedbackFitlerValue(float fitlerValue)
 {
 	m_feedbackFitlerValue = fitlerValue;
@@ -171,17 +243,25 @@ bool Potentiometer::getValue(float &value) {
     bool newValue = true;
 
     unsigned val = analogRead(m_pin); // read the raw value
-	// Use an IIR filter to smooth out the noise in the pot readings
-	unsigned valFilter = ( (1.0f - m_feedbackFitlerValue)*val + m_feedbackFitlerValue*m_lastValue);
 
     // constrain it within the calibration values, them map it to the desired range.
-	valFilter = constrain(valFilter, m_minCalibration, m_maxCalibration);
+    val = constrain(val, m_minCalibration, m_maxCalibration);
+
+    // Use an IIR filter to smooth out the noise in the pot readings
+    unsigned valFilter = static_cast<unsigned>( (1.0f - m_feedbackFitlerValue)*val + (m_feedbackFitlerValue*m_lastValue));
+
     if (valFilter == m_lastValue) {
         newValue = false;
     }
     m_lastValue = valFilter;
 
-	value = static_cast<float>(valFilter - m_minCalibration) / static_cast<float>(m_maxCalibration);
+    //
+    if      (valFilter < m_minCalibrationThresholded)      { value = 0.0f; }
+    else if (valFilter > m_maxCalibrationThresholded) { value = 1.0f; }
+    else {
+        value = static_cast<float>(valFilter - m_minCalibrationThresholded) / static_cast<float>(m_rangeThresholded);
+    }
+
     if (m_swapDirection) {
         value = 1.0f - value;
     }
@@ -192,11 +272,25 @@ int Potentiometer::getRawValue() {
 	return analogRead(m_pin);
 }
 
+// Recalculate thresholded limits based on thresholdFactor
 void Potentiometer::adjustCalibrationThreshold(float thresholdFactor)
 {
-	float threshold = m_maxCalibration * thresholdFactor;
-	m_maxCalibration -= static_cast<unsigned>(threshold);
-	m_minCalibration += static_cast<unsigned>(threshold);
+    m_thresholdFactor = thresholdFactor;
+    // the threshold is specificed as a fraction of the min/max range.
+	unsigned threshold = static_cast<unsigned>((m_maxCalibration - m_minCalibration) * thresholdFactor);
+
+	// Update the thresholded values
+	m_minCalibrationThresholded = m_minCalibration + threshold;
+	m_maxCalibrationThresholded = m_maxCalibration - threshold;
+	m_rangeThresholded = m_maxCalibrationThresholded - m_minCalibrationThresholded;
+}
+
+void Potentiometer::setCalibrationValues(unsigned min, unsigned max, bool swapDirection)
+{
+    m_minCalibration = min;
+    m_maxCalibration = max;
+    m_swapDirection = swapDirection;
+    adjustCalibrationThreshold(m_thresholdFactor);
 }
 
 Potentiometer::Calib Potentiometer::calibrate(uint8_t pin) {