Add files for shifter, fix was to enable sending analog axis in example

Logitec-G920-USB-Shifter/.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

Logitec-G920-USB-Shifter/.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

Logitec-G920-USB-Shifter/include/README

@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

Logitec-G920-USB-Shifter/lib/README

@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

Logitec-G920-USB-Shifter/platformio.ini

@@ -0,0 +1,17 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:sparkfun_promicro8]
+platform = atmelavr
+board = sparkfun_promicro8
+framework = arduino
+lib_deps = 
+	dmadison/Sim Racing Library@^2.0.2
+	mheironimus/Joystick@^2.1.1

Logitec-G920-USB-Shifter/src/main.cpp

@@ -0,0 +1,18 @@
+#include <Arduino.h>
+
+// put function declarations here:
+int myFunction(int, int);
+
+void setup() {
+  // put your setup code here, to run once:
+  int result = myFunction(2, 3);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+}
+
+// put function definitions here:
+int myFunction(int x, int y) {
+  return x + y;
+}

Logitec-G920-USB-Shifter/test/README

@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html

LogitechShifter_Joystick/LogitechShifter_Joystick.ino

@@ -0,0 +1,124 @@
+/*
+ *  Project     Sim Racing Library for Arduino
+ *  @author     David Madison
+ *  @link       github.com/dmadison/Sim-Racing-Arduino
+ *  @license    LGPLv3 - Copyright (c) 2022 David Madison
+ *
+ *  This file is part of the Sim Racing Library for Arduino.
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+ /**
+ * @details Emulates the Logitech Driving Force shifter (included with
+ *          the G923 / G920 / G29 wheels) as a joystick over USB.
+ * @example LogitechShifter_Joystick.ino
+ */
+
+// This example requires the Arduino Joystick Library
+// Download Here: https://github.com/MHeironimus/ArduinoJoystickLibrary
+
+#include <SimRacing.h>
+#include <Joystick.h>
+
+// Set this option to 'true' to send the shifter's X/Y position
+// as a joystick. This is not needed for most games.
+const bool SendAnalogAxis = true;
+
+// Set this option to 'true' to send the raw state of the reverse
+// trigger as its own button. This is not needed for any racing
+// games, but can be useful for custom controller purposes.
+const bool SendReverseRaw = false;
+
+//  Power (VCC): DE-9 pin 9
+// Ground (GND): DE-9 pin 6
+// Note: DE-9 pin 3 (CS) needs to be pulled-up to VCC!
+const int Pin_ShifterX   = A0;  // DE-9 pin 4
+const int Pin_ShifterY   = A2;  // DE-9 pin 8
+const int Pin_ShifterRev = 2;   // DE-9 pin 2
+
+// This pin requires an extra resistor! If you have made the proper
+// connections, change the pin number to the one you're using
+const int Pin_ShifterDetect = SimRacing::UnusedPin;  // DE-9 pin 7, requires pull-down resistor
+
+SimRacing::LogitechShifter shifter(
+	Pin_ShifterX, Pin_ShifterY,
+	Pin_ShifterRev,
+	Pin_ShifterDetect
+);
+//SimRacing::LogitechShifter shifter = SimRacing::CreateShieldObject<SimRacing::LogitechShifter, 2>();
+
+const int Gears[] = { 1, 2, 3, 4, 5, 6, -1 };
+const int NumGears = sizeof(Gears) / sizeof(Gears[0]);
+
+const int ADC_Max = 1023;  // 10-bit on AVR
+
+Joystick_ Joystick(
+	JOYSTICK_DEFAULT_REPORT_ID,      // default report (no additional pages)
+	JOYSTICK_TYPE_JOYSTICK,          // so that this shows up in Windows joystick manager
+	NumGears + SendReverseRaw,       // number of buttons (7 gears: reverse and 1-6)
+	0,                               // number of hat switches (none)
+	SendAnalogAxis, SendAnalogAxis,  // include X and Y axes for analog output, if set above
+	false, false, false, false, false, false, false, false, false);  // no other axes
+
+void updateJoystick();  // forward-declared function for non-Arduino environments
+
+
+void setup() {
+	shifter.begin();
+
+	// if you have one, your calibration line should go here
+	
+	Joystick.begin(false);  // 'false' to disable auto-send
+	Joystick.setXAxisRange(0, ADC_Max);
+	Joystick.setYAxisRange(ADC_Max, 0);  // invert axis so 'up' is up
+
+	updateJoystick();  // send initial state
+}
+
+void loop() {
+	shifter.update();
+
+	if (SendAnalogAxis == true || shifter.gearChanged()) {
+		updateJoystick();
+	}
+}
+
+void updateJoystick() {
+	// set the buttons corresponding to the gears
+	for (int i = 0; i < NumGears; i++) {
+		if (shifter.getGear() == Gears[i]) {
+			Joystick.pressButton(i);
+		}
+		else {
+			Joystick.releaseButton(i);
+		}
+	}
+
+	// set the analog axes (if the option is set)
+	if (SendAnalogAxis == true) {
+		int x = shifter.getPosition(SimRacing::X, 0, ADC_Max);
+		int y = shifter.getPosition(SimRacing::Y, 0, ADC_Max);
+		Joystick.setXAxis(x);
+		Joystick.setYAxis(y);
+	}
+
+	// set the reverse button (if the option is set)
+	if (SendReverseRaw == true) {
+		bool reverseState = shifter.getReverseButton();
+		Joystick.setButton(NumGears, reverseState);  // "NumGears" is the 0-indexed max gear + 1
+	}
+
+	Joystick.sendState();
+}