Refactoring

CD32ControllerUSB/CD32ControllerUSB.ino

@@ -0,0 +1,163 @@
+/*  DaemonBite CD32 to USB Adapter
+ *  Author: Mikael Norrgård <mick@daemonbite.com>
+ *
+ *  Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
+ *  
+ *  GNU GENERAL PUBLIC LICENSE
+ *  Version 3, 29 June 2007
+ *  
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU 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 General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *  
+ */
+
+#include "Gamepad.h"
+
+enum Mode
+{
+  TwoButton,
+  CD32
+};
+
+// Controller DB9 pins (looking face-on to the end of the plug):
+//
+// 5 4 3 2 1
+//  9 8 7 6
+//
+// Wire it up according to the following table:
+//
+// DB9    Arduino Pro Micro
+// --------------------------------------
+//  1     TXO PD3
+//  2     RXI PD2
+//  3     3   PD0
+//  4     4   PD4
+//  5     A0  PF7
+//  6     6   PD7
+//  7     VCC
+//  8     GND
+//  9     A1  PF6
+//
+// Connect a slide switch to pins GND,GND and 2 (PD1)
+
+// Set up USB HID gamepad
+Gamepad_ Gamepad;
+bool usbUpdate = false; // Should gamepad data be sent to USB?
+
+// Controller
+uint8_t axes = 0;
+uint8_t axesPrev = 0;
+uint8_t buttons = 0;
+uint8_t buttonsPrev = 0;
+
+Mode mode = CD32;
+Mode modePrev = mode;
+
+void setup()
+{
+  // Setup switch pin (2, PD1)
+  DDRD  &= ~B00000010; // input
+  PORTD |=  B00000010; // high to enable internal pull-up
+
+  // Setup controller pins
+  DDRD  &= ~B10011101; // inputs
+  PORTD |=  B10011101; // high to enable internal pull-up
+  DDRF  &= ~B11000000; // input
+  PORTF |=  B11000000; // high to enable internal pull-up
+}
+
+void loop()
+{
+  // Set mode from switch
+  (PIND & B00000010) ? mode = CD32 : mode = TwoButton;
+
+  // Read X and Y axes
+  axes = ~(PIND & B00011101);
+
+  switch(mode)
+  {
+    // Two button mode
+    case TwoButton:
+      buttons = ~( ((PIND & B10000000) >> 7) | ((PINF & B01000000) >> 5) | B11111100 );
+      break;
+
+    // CD32 button mode
+    case CD32:
+
+      // Set pin 6 (clock, PD7) and pin 5 (latch, PF7) as output low
+      PORTD &= ~B10000000; // low to disable internal pull-up (will become low when set as output)
+      DDRD  |=  B10000000; // output
+      PORTF &= ~B10000000; // low to disable internal pull-up (will become low when set as output)
+      DDRF  |=  B10000000; // output
+      delayMicroseconds(40);
+
+      // Clear buttons
+      buttons = 0;
+
+      // Read buttons
+      (PINF & B01000000) ? buttons &= ~B00000010 : buttons |= B00000010; // Blue (2)
+      sendClock();
+      (PINF & B01000000) ? buttons &= ~B00000001 : buttons |= B00000001; // Red (1)
+      sendClock();
+      (PINF & B01000000) ? buttons &= ~B00001000 : buttons |= B00001000; // Yellow (4)
+      sendClock();
+      (PINF & B01000000) ? buttons &= ~B00000100 : buttons |= B00000100; // Green (3)
+      sendClock();
+      (PINF & B01000000) ? buttons &= ~B00100000 : buttons |= B00100000; // RTrig (6)
+      sendClock();
+      (PINF & B01000000) ? buttons &= ~B00010000 : buttons |= B00010000; // LTrig (5)
+      sendClock();
+      (PINF & B01000000) ? buttons &= ~B01000000 : buttons |= B01000000; // Play (7)
+
+      // Set pin 5 (latch, PF7) and pin 6 (clock, PD7) as input with pull-ups
+      DDRF  &= ~B10000000; // input
+      PORTF |=  B10000000; // high to enable internal pull-up
+      DDRD  &= ~B10000000; // input
+      PORTD |=  B10000000; // high to enable internal pull-up 
+      delayMicroseconds(40);
+
+      break;
+  }
+
+  // Has any buttons changed state?
+  if (buttons != buttonsPrev)
+  {
+    Gamepad._GamepadReport.buttons = buttons;
+    buttonsPrev = buttons;
+    usbUpdate = true;
+  }
+
+  // Has any axes changed state?
+  if (axes != axesPrev)
+  {
+    Gamepad._GamepadReport.Y = ((axes & B00000100) >> 2) - ((axes & B00001000) >> 3);
+    Gamepad._GamepadReport.X = ((axes & B00010000) >> 4) - (axes & B00000001);
+    axesPrev = axes;
+    usbUpdate = true;
+  }
+
+  if(usbUpdate)
+  {
+    Gamepad.send();
+    usbUpdate = false;
+  }
+}
+
+void sendClock()
+{
+  // Send a clock pulse to pin 6 and wait
+  PORTD |=  B10000000;
+  delayMicroseconds(10);
+  PORTD &= ~B10000000;
+  delayMicroseconds(40);
+}

CD32ControllerUSB/Gamepad.cpp

@@ -0,0 +1,145 @@
+/*  Gamepad.cpp
+ *   
+ *  Based on the advanced HID library for Arduino: 
+ *  https://github.com/NicoHood/HID
+ *  Copyright (c) 2014-2015 NicoHood
+ * 
+ *  Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
+ *
+ *  GNU GENERAL PUBLIC LICENSE
+ *  Version 3, 29 June 2007
+ *  
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU 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 General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *  
+ */
+
+#pragma once
+
+#include "Gamepad.h"
+
+static const uint8_t _hidReportDescriptor[] PROGMEM = {
+  0x05, 0x01,                       // USAGE_PAGE (Generic Desktop)
+  0x09, 0x04,                       // USAGE (Joystick) (Maybe change to gamepad? I don't think so but...)
+  0xa1, 0x01,                       // COLLECTION (Application)
+    0xa1, 0x00,                       // COLLECTION (Physical)
+    
+      0x05, 0x09,                       // USAGE_PAGE (Button)
+      0x19, 0x01,                       // USAGE_MINIMUM (Button 1)
+      0x29, 0x08,                       // USAGE_MAXIMUM (Button 8)
+      0x15, 0x00,                       // LOGICAL_MINIMUM (0)
+      0x25, 0x01,                       // LOGICAL_MAXIMUM (1)
+      0x95, 0x08,                       // REPORT_COUNT (8)
+      0x75, 0x01,                       // REPORT_SIZE (1)
+      0x81, 0x02,                       // INPUT (Data,Var,Abs)
+    
+      0x05, 0x01,                       // USAGE_PAGE (Generic Desktop)
+      0x09, 0x01,                       // USAGE (pointer)
+      0xa1, 0x00,                       // COLLECTION (Physical) 
+        0x09, 0x30,                       // USAGE (X)
+        0x09, 0x31,                       // USAGE (Y)
+        0x15, 0xff,                       // LOGICAL_MINIMUM (-1)
+        0x25, 0x01,                       // LOGICAL_MAXIMUM (1)
+        0x95, 0x02,                       // REPORT_COUNT (2)
+        0x75, 0x08,                       // REPORT_SIZE (8)
+        0x81, 0x02,                       // INPUT (Data,Var,Abs)
+      0xc0,                             // END_COLLECTION
+
+    0xc0,                             // END_COLLECTION
+  0xc0,                             // END_COLLECTION 
+};
+
+Gamepad_::Gamepad_(void) : PluggableUSBModule(1, 1, epType), protocol(HID_REPORT_PROTOCOL), idle(1)
+{
+  epType[0] = EP_TYPE_INTERRUPT_IN;
+  PluggableUSB().plug(this);
+}
+
+int Gamepad_::getInterface(uint8_t* interfaceCount)
+{
+  *interfaceCount += 1; // uses 1
+  HIDDescriptor hidInterface = {
+    D_INTERFACE(pluggedInterface, 1, USB_DEVICE_CLASS_HUMAN_INTERFACE, HID_SUBCLASS_NONE, HID_PROTOCOL_NONE),
+    D_HIDREPORT(sizeof(_hidReportDescriptor)),
+    D_ENDPOINT(USB_ENDPOINT_IN(pluggedEndpoint), USB_ENDPOINT_TYPE_INTERRUPT, USB_EP_SIZE, 0x01)
+  };
+  return USB_SendControl(0, &hidInterface, sizeof(hidInterface));
+}
+
+int Gamepad_::getDescriptor(USBSetup& setup)
+{
+  // Check if this is a HID Class Descriptor request
+  if (setup.bmRequestType != REQUEST_DEVICETOHOST_STANDARD_INTERFACE) { return 0; }
+  if (setup.wValueH != HID_REPORT_DESCRIPTOR_TYPE) { return 0; }
+
+  // In a HID Class Descriptor wIndex cointains the interface number
+  if (setup.wIndex != pluggedInterface) { return 0; }
+
+  // Reset the protocol on reenumeration. Normally the host should not assume the state of the protocol
+  // due to the USB specs, but Windows and Linux just assumes its in report mode.
+  protocol = HID_REPORT_PROTOCOL;
+
+  return USB_SendControl(TRANSFER_PGM, _hidReportDescriptor, sizeof(_hidReportDescriptor));
+}
+
+bool Gamepad_::setup(USBSetup& setup)
+{
+  if (pluggedInterface != setup.wIndex) {
+    return false;
+  }
+
+  uint8_t request = setup.bRequest;
+  uint8_t requestType = setup.bmRequestType;
+
+  if (requestType == REQUEST_DEVICETOHOST_CLASS_INTERFACE)
+  {
+    if (request == HID_GET_REPORT) {
+      // TODO: HID_GetReport();
+      return true;
+    }
+    if (request == HID_GET_PROTOCOL) {
+      // TODO: Send8(protocol);
+      return true;
+    }
+  }
+
+  if (requestType == REQUEST_HOSTTODEVICE_CLASS_INTERFACE)
+  {
+    if (request == HID_SET_PROTOCOL) {
+      protocol = setup.wValueL;
+      return true;
+    }
+    if (request == HID_SET_IDLE) {
+      idle = setup.wValueL;
+      return true;
+    }
+    if (request == HID_SET_REPORT)
+    {
+    }
+  }
+
+  return false;
+}
+
+void Gamepad_::reset()
+{
+  _GamepadReport.X = 0;
+  _GamepadReport.Y = 0;
+  _GamepadReport.buttons = 0;
+  this->send();
+}
+
+void Gamepad_::send() 
+{
+  USB_Send(pluggedEndpoint | TRANSFER_RELEASE, &_GamepadReport, sizeof(GamepadReport));
+}

CD32ControllerUSB/Gamepad.h

@@ -0,0 +1,80 @@
+/*  Gamepad.h
+ *   
+ *  Based on the advanced HID library for Arduino: 
+ *  https://github.com/NicoHood/HID
+ *  Copyright (c) 2014-2015 NicoHood
+ * 
+ *  Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
+ *
+ *  GNU GENERAL PUBLIC LICENSE
+ *  Version 3, 29 June 2007
+ *  
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU 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 General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *  
+ */
+
+#pragma once
+
+#include <Arduino.h>
+#include "HID.h"
+
+// NOTE: To make this work on the MiSTer (or possibly other Linux distros), 
+// you need to edit USBDesc.h like follows. Change:
+// #define ISERIAL         3
+// to
+// #define ISERIAL         0
+
+// The numbers after colon are bit fields, meaning how many bits the field uses.
+// Remove those if there are problems
+typedef struct {
+  union 
+  {
+    struct {
+      bool  b0: 1 ;
+      bool  b1: 1 ;
+      bool  b2: 1 ;
+      bool  b3: 1 ;
+      bool  b4: 1 ;
+      bool  b5: 1 ;
+      bool  b6: 1 ;
+      bool  b7: 1 ; 
+    };
+    uint8_t buttons;
+  };
+  int8_t X  ;
+  int8_t Y  ;  
+  
+} GamepadReport;
+
+
+class Gamepad_ : public PluggableUSBModule
+{  
+  private:
+    uint8_t reportId;
+
+  protected:
+    int getInterface(uint8_t* interfaceCount);
+    int getDescriptor(USBSetup& setup);
+    bool setup(USBSetup& setup);
+    
+    uint8_t epType[1];
+    uint8_t protocol;
+    uint8_t idle;
+    
+  public:
+    GamepadReport _GamepadReport;
+    Gamepad_(void);
+    void reset(void);
+    void send();
+};

README.md

@@ -1,31 +1,19 @@
-# DaemonBite Sega Controller To USB Adapter
+# DaemonBite Retro Controllers To USB Adapters
 ## Introduction
-This is a simple to build adapter for connecting Mega Drive (Genesis), Master System (+ Atari and C= controllers) to USB. It supports 3 and 6-button Mega Drive controllers and 1 and 2-button SMS/Atari/C= controllers.
+This is a collection of easy to build adapters for connecting Mega Drive/Genesis (3/6-button), Master System, Atari, Commodore, Amiga (incl. CD32) controllers to USB. Support for more controllers is on the way (NES, SNES, NeoGeo etc.).
 
-The input lag for this adapter is minimal. Here is the result from a test with a 1ms polling rate on a MiSTer:
+The input lag for these adapters is minimal. Here is the result of the Sega controller adapter from a test with a 1ms polling rate on a MiSTer:
 
 | Controller | Samples | Average | Max | Min | Std Dev |
 | ------ | ------ | ------ | ------ | ------ | ------ | 
 | Original 3-Button Mega Drive Controller | 2342 | 0.75ms | 1.28ms | 0.24ms | 0.29ms |
 | 8bitdo M30 Wireless 2.4G | 2348 | 4.54ms | 8.05ms | 2.22ms | 1.31ms |
 
-The Mega Drive gamepad interface is based on this repository : https://github.com/jonthysell/SegaController but almost entirely rewritten and a lot of optimisations have been made.
-
-## Parts you need
-- Arduino Pro Micro (ATMega32U4)
-- Male end of Mega Drive controller extension (or DSUB 9Pin Male connector and some wires)
-- Heat shrink tube (Ø ~20mm)
-- Micro USB cable
-
-## Wiring
-![Assemble1](images/sega-usb-adapter-wiring.png)
-
-## How to assemble (please ignore the switch)
-![Assemble1](images/sega-usb-adapter-1.png)
-![Assemble1](images/sega-usb-adapter-2.png)  
-(The switch goes to pins GND-GND-2 even if the picture above shows it connected to GND-2-3)
-![Assemble1](images/sega-usb-adapter-3.png)
-![Assemble1](images/sega-usb-adapter-4.png)
+## How to build
+See the README files in the subfolders for build instructions. All the adapters are build around the Arduino Pro Micro.
 
 ## License
 This project is licensed under the GNU General Public License v3.0.
+
+## Credits
+The Mega Drive gamepad interface is based on this repository : https://github.com/jonthysell/SegaController but almost entirely rewritten and a lot of optimisations have been made.

SegaControllerUSB/Gamepad.cpp

@@ -1,4 +1,8 @@
 /*  Gamepad.cpp
+ *   
+ *  Based on the advanced HID library for Arduino: 
+ *  https://github.com/NicoHood/HID
+ *  Copyright (c) 2014-2015 NicoHood
  * 
  *  Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
  *
@@ -20,13 +24,14 @@
  *  
  */
 
+#pragma once
+
 #include "Gamepad.h"
 
 static const uint8_t _hidReportDescriptor[] PROGMEM = {
   0x05, 0x01,                       // USAGE_PAGE (Generic Desktop)
-    0x09, 0x04,                       // USAGE (Joystick) (Maybe change to gamepad? I don't think so but...)
-    0xa1, 0x01,                       // COLLECTION (Application)
-    0x85, 0x01,                       // REPORT_ID (1) // change to 3 if using mouse and keyboard on 1&2
+  0x09, 0x04,                       // USAGE (Joystick) (Maybe change to gamepad? I don't think so but...)
+  0xa1, 0x01,                       // COLLECTION (Application)
     0xa1, 0x00,                       // COLLECTION (Physical)
     
       0x05, 0x09,                       // USAGE_PAGE (Button)
@@ -54,22 +59,76 @@ static const uint8_t _hidReportDescriptor[] PROGMEM = {
   0xc0,                             // END_COLLECTION 
 };
 
-
-Gamepad_::Gamepad_(void) 
-{ 
-  reportId=1;
-  static HIDSubDescriptor node(_hidReportDescriptor, sizeof(_hidReportDescriptor));
-  HID().AppendDescriptor(&node);
+Gamepad_::Gamepad_(void) : PluggableUSBModule(1, 1, epType), protocol(HID_REPORT_PROTOCOL), idle(1)
+{
+  epType[0] = EP_TYPE_INTERRUPT_IN;
+  PluggableUSB().plug(this);
 }
 
-void Gamepad_::begin(uint8_t id) 
+int Gamepad_::getInterface(uint8_t* interfaceCount)
 {
-  reportId=id;
+  *interfaceCount += 1; // uses 1
+  HIDDescriptor hidInterface = {
+    D_INTERFACE(pluggedInterface, 1, USB_DEVICE_CLASS_HUMAN_INTERFACE, HID_SUBCLASS_NONE, HID_PROTOCOL_NONE),
+    D_HIDREPORT(sizeof(_hidReportDescriptor)),
+    D_ENDPOINT(USB_ENDPOINT_IN(pluggedEndpoint), USB_ENDPOINT_TYPE_INTERRUPT, USB_EP_SIZE, 0x01)
+  };
+  return USB_SendControl(0, &hidInterface, sizeof(hidInterface));
 }
 
-void Gamepad_::end(void) 
+int Gamepad_::getDescriptor(USBSetup& setup)
 {
-  this->reset();
+  // Check if this is a HID Class Descriptor request
+  if (setup.bmRequestType != REQUEST_DEVICETOHOST_STANDARD_INTERFACE) { return 0; }
+  if (setup.wValueH != HID_REPORT_DESCRIPTOR_TYPE) { return 0; }
+
+  // In a HID Class Descriptor wIndex cointains the interface number
+  if (setup.wIndex != pluggedInterface) { return 0; }
+
+  // Reset the protocol on reenumeration. Normally the host should not assume the state of the protocol
+  // due to the USB specs, but Windows and Linux just assumes its in report mode.
+  protocol = HID_REPORT_PROTOCOL;
+
+  return USB_SendControl(TRANSFER_PGM, _hidReportDescriptor, sizeof(_hidReportDescriptor));
+}
+
+bool Gamepad_::setup(USBSetup& setup)
+{
+  if (pluggedInterface != setup.wIndex) {
+    return false;
+  }
+
+  uint8_t request = setup.bRequest;
+  uint8_t requestType = setup.bmRequestType;
+
+  if (requestType == REQUEST_DEVICETOHOST_CLASS_INTERFACE)
+  {
+    if (request == HID_GET_REPORT) {
+      // TODO: HID_GetReport();
+      return true;
+    }
+    if (request == HID_GET_PROTOCOL) {
+      // TODO: Send8(protocol);
+      return true;
+    }
+  }
+
+  if (requestType == REQUEST_HOSTTODEVICE_CLASS_INTERFACE)
+  {
+    if (request == HID_SET_PROTOCOL) {
+      protocol = setup.wValueL;
+      return true;
+    }
+    if (request == HID_SET_IDLE) {
+      idle = setup.wValueL;
+      return true;
+    }
+    if (request == HID_SET_REPORT)
+    {
+    }
+  }
+
+  return false;
 }
 
 void Gamepad_::reset()
@@ -82,5 +141,5 @@ void Gamepad_::reset()
 
 void Gamepad_::send() 
 {
-  HID().SendReport(reportId,&_GamepadReport,sizeof(GamepadReport));
+  USB_Send(pluggedEndpoint | TRANSFER_RELEASE, &_GamepadReport, sizeof(GamepadReport));
 }

SegaControllerUSB/Gamepad.h

@@ -1,4 +1,8 @@
 /*  Gamepad.h
+ *   
+ *  Based on the advanced HID library for Arduino: 
+ *  https://github.com/NicoHood/HID
+ *  Copyright (c) 2014-2015 NicoHood
  * 
  *  Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
  *
@@ -20,8 +24,17 @@
  *  
  */
 
+#pragma once
+
+#include <Arduino.h>
 #include "HID.h"
 
+// NOTE: To make this work on the MiSTer (or possibly other Linux distros), 
+// you need to edit USBDesc.h like follows. Change:
+// #define ISERIAL         3
+// to
+// #define ISERIAL         0
+
 // The numbers after colon are bit fields, meaning how many bits the field uses.
 // Remove those if there are problems
 typedef struct {
@@ -45,17 +58,23 @@ typedef struct {
 } GamepadReport;
 
 
-class Gamepad_
+class Gamepad_ : public PluggableUSBModule
 {  
   private:
     uint8_t reportId;
+
+  protected:
+    int getInterface(uint8_t* interfaceCount);
+    int getDescriptor(USBSetup& setup);
+    bool setup(USBSetup& setup);
+    
+    uint8_t epType[1];
+    uint8_t protocol;
+    uint8_t idle;
     
   public:
     GamepadReport _GamepadReport;
     Gamepad_(void);
-    void begin(uint8_t id);
-    void end(void);
     void reset(void);
     void send();
 };
-extern Gamepad_ Gamepad;

SegaControllerUSB/README.md

@@ -0,0 +1,32 @@
+# DaemonBite Sega Controller To USB Adapter
+## Introduction
+This is a simple to build adapter for connecting Mega Drive (Genesis), Master System (+ Atari and C= controllers) to USB. It supports 3 and 6-button Mega Drive controllers and 1 and 2-button SMS/Atari/C= controllers.
+
+The input lag for this adapter is minimal. Here is the result from a test with a 1ms polling rate on a MiSTer:
+
+| Controller | Samples | Average | Max | Min | Std Dev |
+| ------ | ------ | ------ | ------ | ------ | ------ | 
+| Original 3-Button Mega Drive Controller | 2342 | 0.75ms | 1.28ms | 0.24ms | 0.29ms |
+| 8bitdo M30 Wireless 2.4G | 2348 | 4.54ms | 8.05ms | 2.22ms | 1.31ms |
+
+## Parts you need
+- Arduino Pro Micro (ATMega32U4)
+- Male end of Mega Drive controller extension (or DSUB 9Pin Male connector and some wires)
+- Heat shrink tube (Ø ~20mm)
+- Micro USB cable
+
+## Wiring
+![Assemble1](images/sega-usb-adapter-wiring.png)
+
+## How to assemble (please ignore the switch)
+![Assemble1](images/sega-usb-adapter-1.png)
+![Assemble1](images/sega-usb-adapter-2.png)  
+(The switch goes to pins GND-GND-2 even if the picture above shows it connected to GND-2-3)
+![Assemble1](images/sega-usb-adapter-3.png)
+![Assemble1](images/sega-usb-adapter-4.png)
+
+## License
+This project is licensed under the GNU General Public License v3.0.
+
+## Credits
+The Mega Drive gamepad interface is based on this repository : https://github.com/jonthysell/SegaController but almost entirely rewritten and a lot of optimisations have been made.

SegaControllerUSB/SegaControllerUSB.ino

@@ -52,8 +52,7 @@ word currentState = 0;
 word lastState = 1;
 
 void setup()
-{
-  Gamepad.begin(1);
+{ 
 }
 
 void loop()