Add function to control G25/G27 power LED

Author: dmadison

keywords.txt

@@ -149,6 +149,8 @@ getButton	KEYWORD2
 getButtonChanged	KEYWORD2
 getDpadAngle	KEYWORD2
 buttonsChanged	KEYWORD2
+setPowerLED	KEYWORD2
+getPowerLED	KEYWORD2
 
 #######################################
 # LogitechShifterG25 Methods and Functions (KEYWORD2)

src/SimRacing.cpp

@@ -1157,6 +1157,7 @@ LogitechShifterG27::LogitechShifterG27(
 	pinLed(sanitizePin(pinLed))
 {
 	this->pinModesSet = false;
+	this->setPowerLED(1);  // power LED on by default
 	this->buttonStates = this->previousButtons = 0x0000;  // zero all button data
 
 	// using the calibration values from my own G27 shifter
@@ -1197,10 +1198,10 @@ void LogitechShifterG27::setPinModes(bool enabled) {
 		digitalWrite(this->pinClock, LOW);
 		pinMode(this->pinClock, OUTPUT);
 
-		// if we have an LED pin, set it to output and turn
-		// the LED on (active low)
+		// if we have an LED pin, set it to output and write the
+		// commanded state (inverted, as the LED is active-low)
 		if (this->pinLed != UnusedPin) {
-			digitalWrite(this->pinLed, LOW);
+			digitalWrite(this->pinLed, !(this->ledState));
 			pinMode(this->pinLed, OUTPUT);
 		}
 	}
@@ -1229,6 +1230,10 @@ void LogitechShifterG27::setPinModes(bool enabled) {
 	this->pinModesSet = enabled;
 }
 
+void LogitechShifterG27::setPowerLED(bool state) {
+	this->ledState = state;
+}
+
 uint16_t LogitechShifterG27::readShiftRegisters() {
 	// if the pin outputs are not set, quit (none pressed)
 	if (!this->pinModesSet) return 0x0000;
@@ -1293,6 +1298,10 @@ bool LogitechShifterG27::updateState(bool connected) {
 			this->setPinModes(1);
 		}
 
+		if (this->pinLed != UnusedPin) {
+			digitalWrite(this->pinLed, !(this->ledState));  // active low
+		}
+
 		const uint16_t data = this->readShiftRegisters();
 		this->cacheButtons(data);
 		changed |= this->buttonsChanged();

src/SimRacing.h

@@ -1024,6 +1024,29 @@ namespace SimRacing {
 		*/
 		bool buttonsChanged() const;
 
+		/**
+		* Sets the state of the shifter's power LED
+		*
+		* If the shifter is currently connected, this function will turn the
+		* power LED on and off. If the shifter is not connected, this will
+		* buffer the commanded state and set the LED when the shifter is next
+		* connected.
+		*
+		* @note The update() function must be called in order to push the
+		*       commanded state to the shifter.
+		*
+		* @param state the state to set: 1 = on, 0 = off
+		*/
+		void setPowerLED(bool state);
+
+		/**
+		* Gets the commanded state of the shifter's power LED
+		* 
+		* @returns 'true' if the power LED is commanded to be on, 'false'
+		*          if it's commanded to be off.
+		*/
+		bool getPowerLED() const { return this->ledState; }
+
 	protected:
 		/** @copydoc Peripheral::updateState(bool) */
 		virtual bool updateState(bool connected);
@@ -1079,6 +1102,7 @@ namespace SimRacing {
 
 		// I/O state
 		bool pinModesSet;            ///< Flag for whether the output pins are enabled / driven
+		bool ledState;               ///< Commanded state of the power LED output, DE-9 pin 5
 
 		// Button states
 		uint16_t buttonStates;       ///< the state of the buttons, as a packed word (where 0 = unpressed and 1 = pressed)