Check analog range calibration for change

Instead of detecting simply if the ADC value changed, this now checks if the changed value is outside of the calibrated range (in the same direction it was previously). If so, the user-facing classes aren't going to care and can safely ignore the update.

This was written specifically to solve an issue with the pedals, which don't need to send constant updates when they're at their resting position.

Author: dmadison

src/SimRacing.cpp

@@ -268,10 +268,33 @@ AnalogInput::AnalogInput(uint8_t p)
 
 bool AnalogInput::read() {
 	bool changed = false;
+
 	if (Pin != NOT_A_PIN) {
-		const int current = this->position;
+		const int previous = this->position;
 		this->position = analogRead(Pin);
-		if (current != this->position) changed = true;
+
+		// check if value is different for 'changed' flag
+		if (previous != this->position) {
+
+			const int rMin = isInverted() ? getMax() : getMin();
+			const int rMax = isInverted() ? getMin() : getMax();
+
+			if (
+				// if the previous value was under the minimum range
+				// and the current value is as well, no change
+				!(previous < rMin && this->position < rMin) && 
+
+				// if the previous value was over the maximum range
+				// and the current value is as well, no change
+				!(previous > rMax && this->position > rMax)
+			)
+			{
+				// otherwise, the current value is either within the
+				// range limits *or* it has changed from one extreme
+				// to the other. Either way, mark it changed!
+				changed = true;
+			}
+		}
 	}
 	return changed;
 }