Initial commit.

Joystick.cpp

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+#include "Joystick.h"
+#include <Arduino.h>
+
+Joystick::Joystick(bool debug) {
+  _debug = debug;
+}
+
+void Joystick::Init() {
+  Serial.begin(115200);
+  delay(100);
+
+  for (uint8_t i=0; i < JOYSTICK_NUM_AXES; i++) {
+    _joyReport.axis[i] = 0;
+  }
+  for (uint8_t i=0; i < JOYSTICK_NUM_BYTES; i++) {
+    _joyReport.button[i] = 0;
+  }
+  
+  if (_debug) Serial.println("DEBUG: Joystick library initialized.");
+}
+
+void Joystick::SetAxis(uint8_t axis, int16_t value) {
+  if (axis >= JOYSTICK_NUM_AXES) return;
+  _joyReport.axis[axis] = value;
+  if (_debug) Serial.println("DEBUG: Axis change recorded.");
+}
+
+void Joystick::PressButton(uint8_t button) {
+  if (button >= JOYSTICK_NUM_BUTTONS) return;
+  uint8_t byte = button / 8;
+  uint8_t bit = button % 8;
+  _joyReport.button[byte] |= 1 << bit;
+  if (_debug) Serial.println("DEBUG: Button press recorded.");
+}
+
+void Joystick::ReleaseButton(uint8_t button) {
+  if (button >= JOYSTICK_NUM_BUTTONS) return;
+  uint8_t byte = button / 8;
+  uint8_t bit = button % 8;
+  _joyReport.button[byte] |= 0 << bit;
+  if (_debug) Serial.println("DEBUG: Button release recorded.");
+}
+
+void Joystick::ReleaseAllButtons() {
+  for (uint8_t i = 0; i < JOYSTICK_NUM_BYTES; i++) {
+    _joyReport.button[i] = 0;
+  }
+  if (_debug) Serial.println("DEBUG: All-button release recorded.");
+}
+
+void Joystick::Write() {
+  Serial.write((uint8_t *)&_joyReport, sizeof(JoyReport));
+  delay(250);
+}

Joystick.h

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+#ifndef _JOYSTICK_H_
+#define _JOYSTICK_H_
+
+#include <Arduino.h>
+
+// If you're using the arduino-big-joystick firmware, these numbers can't be
+// changed. If you're writing your own Report Descriptor, tune these to match.
+// TODO: Pass these in to the constructor, with the same caveats. Shouldn't need
+// to edit the header file to make something work in a library. :(
+#define JOYSTICK_NUM_AXES 8
+#define JOYSTICK_NUM_BUTTONS 40
+#define JOYSTICK_NUM_BYTES (JOYSTICK_NUM_BUTTONS+7)/8
+
+typedef struct JoyReport {
+  int16_t axis[JOYSTICK_NUM_AXES];
+  uint8_t button[JOYSTICK_NUM_BYTES];
+} ;
+
+class Joystick {
+  public:
+    Joystick(bool debug=false);
+    void Init();
+    
+    void SetAxis(uint8_t axis, int16_t value);
+
+    void PressButton(uint8_t button);
+    void ReleaseButton(uint8_t button);
+    void ReleaseAllButtons();
+
+    // This actually sends the commands. You *must* call this for the
+    // joystick to do anything!
+    void Write();
+
+  private:
+    JoyReport _joyReport;
+    bool _debug;
+};
+
+#endif

Readme.md

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+This is a simple library that builds and sends USB HID Joystick reports.
+
+This requires that your Arduino's USB communication chip be programmed
+with the arduino-big-joystick firmware (or similar).
+
+See <https://github.com/harlequin-tech/arduino-usb> for more info.
+