FAST HID Joystick converter for 2 digital joysticks

Hi,
if you want to connect some oldshool digital joysticks like the competition pro to your pc, ps3, raspberry pi or whatever here's a simple and fast solution. It's also perfect to build your retro commodore amiga/c64/atari/sega...

This code transforms the arduino leonardo board into a HID joystick converter for two digital joysticks.

put this into your HID.cpp to create 2 HID Gamepads:

Code:

// Commodore / Atari Joystick 1

   0x05, 0x01, // USAGE_PAGE (Generic Desktop)
   0x09, 0x05, // USAGE (Game Pad)
   0xa1, 0x01, // COLLECTION (Application)
   0x85, 0x03, // REPORT_ID (3)
   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, 0x02, // REPORT_SIZE (2) ; two bits to represent each axis
   0x81, 0x02, // INPUT (Data,Var,Abs)
   0xc0, // END_COLLECTION
   0x05, 0x09, // USAGE_PAGE (Button)
   0x19, 0x01, // USAGE_MINIMUM (Button 1)
   0x29, 0x01, // USAGE_MAXIMUM (Button 1)
   0x15, 0x00, // LOGICAL_MINIMUM (0)
   0x25, 0x01, // LOGICAL_MAXIMUM (1)
   0x95, 0x01, // REPORT_COUNT (1) ; 1 button
   0x75, 0x01, // REPORT_SIZE (1)
   0x81, 0x02, // INPUT (Data,Var,Abs)
   0x95, 0x02, // REPORT_COUNT (2) ; to pad out the bits into a number divisible by 8
   0x81, 0x03, // INPUT (Const,Var,Abs)
   0x05, 0x09, // USAGE_PAGE (Button)
   0x19, 0x02, // USAGE_MINIMUM (Button 2)
   0x29, 0x02, // USAGE_MAXIMUM (Button 2)
   0x15, 0x00, // LOGICAL_MINIMUM (0)
   0x25, 0x01, // LOGICAL_MAXIMUM (1)
   0x95, 0x01, // REPORT_COUNT (1) ; 1 button
   0x75, 0x01, // REPORT_SIZE (1)
   0x81, 0x02, // INPUT (Data,Var,Abs)
   0xc0, // END_COLLECTION

// Commodore / Atari Joystick 2

   0x05, 0x01, // USAGE_PAGE (Generic Desktop)
   0x09, 0x05, // USAGE (Game Pad)
   0xa1, 0x01, // COLLECTION (Application)
   0x85, 0x04, // REPORT_ID (4)
   0xa1, 0x00, // COLLECTION (Physical)
   0x05, 0x09, // USAGE_PAGE (Button)
   0x19, 0x01, // USAGE_MINIMUM (Button 1)
   0x29, 0x02, // USAGE_MAXIMUM (Button 2)
   0x15, 0x00, // LOGICAL_MINIMUM (0)
   0x25, 0x01, // LOGICAL_MAXIMUM (1)
   0x95, 0x02, // REPORT_COUNT (2) ; 2 buttons
   0x75, 0x01, // REPORT_SIZE (1)
   0x81, 0x02, // INPUT (Data,Var,Abs)
   0x95, 0x02, // REPORT_COUNT (2) ; to pad out the bits into a number divisible by 8
   0x81, 0x03, // INPUT (Const,Var,Abs)
   0x05, 0x01, // USAGE_PAGE (Generic Desktop)
   0x09, 0x30, // USAGE (X)
   0x09, 0x31, // USAGE (Y)
   0x15, 0xff, // LOGICAL_MINIMUM (-1)
   0x25, 0x01, // LOGICAL_MAXIMUM (1)
   0x95, 0x02, // REPORT_COUNT (2)
   0x75, 0x02, // REPORT_SIZE (2) ; two bits to represent each axis
   0x81, 0x02, // INPUT (Data,Var,Abs)
   0xc0, // END_COLLECTION
   0xc0 // END_COLLECTION

merge this into your existing sketch or use it as a standalone solution:

Code:

   uint8_t Joy;
   uint8_t MemoJoy1 ;
   uint8_t MemoJoy2 ;

   void setup() {

   // Joystick 1
   pinMode(0, INPUT_PULLUP); // configure as DigIn with pull up
   pinMode(1, INPUT_PULLUP);
   pinMode(2, INPUT_PULLUP);
   pinMode(3, INPUT_PULLUP);
   pinMode(4, INPUT_PULLUP);
   pinMode(5, INPUT_PULLUP);

   // Joystick 2
   pinMode(A0, INPUT_PULLUP);
   pinMode(A1, INPUT_PULLUP);
   pinMode(A2, INPUT_PULLUP);
   pinMode(A3, INPUT_PULLUP);
   pinMode(A4, INPUT_PULLUP);
   pinMode(A5, INPUT_PULLUP);

   }

   void loop()
   { // Joystick 1
   Joy = ~PIND & 0b10011111; // read Port D, invert logic, mask relevant bits
   if (Joy != MemoJoy1) { // state changed?
   HID_SendReport(3, &Joy, 1); // send HID report
   MemoJoy1 = Joy; // save last state
   }
   // Joystick 2
   Joy = ~PINF & 0b11110011;
   if (Joy != MemoJoy2) {
   HID_SendReport(4, &Joy, 1);
   MemoJoy2 = Joy;
   }
   }

Joystick 1 must be hooked up to digital inputs 0...5, joystck 2 to analog inputs A0...A5.
This is the pin assignment:

Code:

Joystick 1

   IO DB9 Function

   1 1 Forward
   0 2 Back
   2 3 Left
   3 4 Right
   5 not connected
   4 6 Button1
   5V 7 +5V ( only needed if the joystick contains circuits like autofire,.. )
   GND 8 Ground
   6 9 Button2 (optional)

   Joystick 2

   IO DB9 Function

   A0 1 Forward
   A1 2 Back
   A2 3 Left
   A3 4 Right
   5 not connected
   A5 6 Button1
   5V 7 +5V
   GND 8 Ground
   A4 9 Button2 (optional)

Together with the arduino keyboard interface http://www.raspberrypi.org/phpBB3/viewtopic.php?f=40&t=10990
made by thradtke you have the complete keyrah functionality.

Olaf

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