Usb => PS/2 & Gameport HAT v1.4

Author: ChrisDeadman

Convert USB devices to PS/2 & Gameport devices with the power of Arduino 🙂

Supported input devices

HID Mouse
HID Keyboard
HID Mouse / Keyboard Combo
HID Joystick / Gamepad*
Xbox 360 Controller**

* Descriptor parsing is a work in progress and may not work for all devices.
** Currently, only the Xbox 360 Wireless Receiver is supported.

Outputs

PS/2 Mouse* port
PS/2 Keyboard** / Mouse combined port
Gameport

* All types are supported, including IntelliMouse (5 Buttons + Scroll wheel).
** Scancode Set 2

Supported Arduino Boards

SparkFun SAMD21 Mini Breakout*

* Other ATSAMD21G18 boards should also work well, provided they have the same pinout.

Usage

Power the board using a USB cable and set the Power select jumper to USB.
Alternative: Set Power select jumper to Gameport. Be aware that the current is limited depending on the host machine.
Use a USB OTG cable to connect your USB device to the Arduino.
Recommendation: Connect a USB hub to the Arduino if you want to use multiple USB devices.

LEDs

LED1 is ON if the host inhibits any PS/2 port.
LED1 is FLASHING if data transfer occurs over any PS/2 port.
LED2 indicates Joy Button press or the highest Axis Value.

Input Mappings

USB -> Gameport

This is how USB Joysticks / Gamepads are mapped to the Gameport:

Joystick 1	Joystick 2	Gameport
X-Axis 1 / D-Pad	-	X-Axis 1
Y-Axis 1 / D-Pad	-	Y-Axis 1
X-Axis 2	X-Axis 1 / D-Pad	X-Axis 2
Y-Axis 2	Y-Axis 2 / D-Pad	Y-Axis 2
Button 1 / A / R2	-	Button 1
Button 2 / B / L2	-	Button 2
Button 3 / X / Select	Button 1 / A / R2	Button 3
Button 4 / Y / Start	Button 2 / B / L2	Button 4

Emulation Mode Mappings

Consult the table below to understand the mapping between various device inputs when an emulation mode is enabled:

Keyboard	Mouse	Joystick	Gameport
Left / Right Arrow	X-Axis	X-Axis 1 / D-Pad	X-Axis 1
Up / Down Arrow	Y-Axis	Y-Axis 1 / D-Pad	Y-Axis 1
A / D	-	X-Axis 2	X-Axis 2
W / S	Scroll wheel	Y-Axis 2	Y-Axis 2
L-Ctrl / R-Ctrl	Button 1	Button 1 / A	Button 1
Space / R-Shift	Button 2	Button 2 / B	Button 2
L-Alt / CapsLock	Button 3	Button 3 / X	Button 3
L-Shift	Button 4	Button 4 / Y	Button 4
Period	Button 5	Button 5 / R1	-
Comma	-	Button 6 / L1	-
Up Arrow	-	Button 7 / R2	-
Down Arrow	-	Button 8 / L2	-
Escape	-	Button 9 / SELECT	-
Tab	-	Button 10 / START	-

Here are a few examples:

Joystick -> Keyboard Emulation Mode:
Moving the joystick along X-Axis 1 (or D-Pad left and right) acts as if you pressed the Left / Right Arrow keys on the keyboard.
Joystick -> Mouse Emulation Mode:
Moving the joystick along X-Axis 1 (or D-Pad left and right) move the mouse cursor along the X-Axis.
Keyboard -> Joystick Emulation Mode:
If L-CTRL or R-CTRL is pressed, it acts as if you pressed Button 1 on the joystick.
Keyboard -> Mouse Emulation Mode:
The Left / Right Arrow keys on your keyboard move the mouse cursor along the X-Axis.
Mouse -> Joystick Emulation Mode:
Moving the mouse left and right corresponds to moving the joystick along the X-Axis 1.

Setup Mode

Enter this mode to enable special features. Note that those settings are reset to default when the device is reset.

Feedback

LED1 blink count indicates the current setting.
LED2 blink count indicates the value of the current setting, blinks only in edit mode.
Keyboard LEDs will also blink accordingly (LED1=CapsLock, LED2=NumLock and ScrollLock).
LEDs of supported controllers (e.g. Xbox 360) will also blink accordingly.

Settings

Setting	LED1 Blinks	Values / LED2 Blinks	Default
Emulation Mode	1	OFF	OFF
		1 Joystick -> Keyboard
		2 Joystick -> Mouse
		3 Keyboard -> Joystick
		4 Keyboard -> Mouse
		5 Mouse -> Joystick
Swap joy axis 3 and 4	2	ON / OFF	OFF
Mouse Emu Speed	3	1 <= n <= 255	2

Key bindings

Keyboard	Joystick / Gamepad	Function
CTRL+SHIFT+WIN	Button 5 / R1 + Button 6 / L1	Hold for ~1s to enter/exit setup mode
Return	Button 1 / A	Edit setting / exit edit mode
Right Arrow	X-Axis 1 / D-PAD Right	Next setting / increase value (edit mode)
Left Arrow	X-Axis 1 / D-PAD Left	Prev. setting / decrease value (edit mode)
ESC	Button 9 / SELECT	Apply Default Settings and exit setup mode
F1	-	Set Emulation Mode #1 and exit setup mode
F2	-	Set Emulation Mode #2 and exit setup mode
F3	-	Set Emulation Mode #3 and exit setup mode
F4	-	Set Emulation Mode #4 and exit setup mode
F5	-	Set Emulation Mode #5 and exit setup mode
F6	-	Toggle Swap joy axis 3 and 4 and exit setup mode
F7	-	Decrease Mouse Emu Speed and exit setup mode
F8	-	Increase Mouse Emu Speed and exit setup mode

Flashing the firmware

Install drivers for you serial adapter
Connect the SAMD21 Mini Breakout to your computer
(either via USB OTG cable or via the Debug Conn. pins using a USB<->Serial converter)
Double-Tap the reset button on the board to enter bootloader mode

Automatically

Download and run latest firmware_flash.bat

Manually

Download latest firmware.bin
Download Bossa
Flash with bossac --port=/dev/ttyUSB0 -U -i --offset=0x2000 -e -w firmware.bin -R

Ensure you change --port to match your system's actual port. The example provided is for Linux systems.

Developer Notes

Diagnostic information is available via Debug Conn. @ 115200 8N1
Sending any character returns sent/received data and device status.
Enable USB Debugging in USB.h (in USB_Host_Library_SAMD) by uncommenting #define DEBUG_USB_HOST 1 and setting #define USB_HOST_SERIAL to SERIAL_PORT_HARDWARE.
You can change pins in include/Config.h.
You can add support for additional USB devices by implementing a JoystickDriverMapper and adding it to joy_mappers in main.cpp.

Schematic

Layout

Upside

Backside

Release notes