Small change to Sega two controller adapter wiring.

Small change to Sega two controller adapter wiring. Wiring diagrams added for Sega two controller adapter and NES/SNES adapters.

.gitignore

@@ -0,0 +1,3 @@
+# Ignore VS Code folders
+.vscode
+.build

CD32ControllerUSB/CD32ControllerUSB.ino

@@ -47,8 +47,8 @@
 // (Second controller port for future reference)
 //  1     15  PB1
 //  2     14  PB3
-//  3     16  PB2
-//  4     10  PB6
+//  3      2  PD1
+//  4      5  PC6
 //  5     A2  PF5
 //  6      7  PE6 (Important: Connect this pin via a 220Ω resistor!)
 //  7     VCC

SNESControllersUSB/README.md

@@ -9,7 +9,7 @@ With this simple to build  adapter you can connect NES gamepads to a PC, Raspber
 - Micro USB cable
 
 ## Wiring
-![Assemble1](images/nes-usb-adapter-wiring.png)
+![Assemble1](images/snes-usb-adapter-wiring.png)
 
 ## License
 This project is licensed under the GNU General Public License v3.0.

SegaTwoControllersUSB/README.md

@@ -0,0 +1,25 @@
+# DaemonBite Sega Controllers To USB Adapter
+## Introduction
+This is a simple to build adapter for connecting two 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 (one port version):
+
+| 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)
+- 2x Male end of Mega Drive controller extension (or DSUB 9Pin Male connectors and some wires)
+- Heat shrink tube (Ø ~20mm)
+- Micro USB cable
+
+## Wiring
+![Assemble1](images/sega-usb-2x-adapter-wiring.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.

SegaTwoControllersUSB/SegaControllers32U4.cpp

@@ -33,25 +33,28 @@
 
 SegaControllers32U4::SegaControllers32U4(void)
 {
-    // Setup select pin as output high (16, PB2)
-    DDRB  |= B00000100; // output
-    PORTB |= B00000100; // high
+    // Setup select pin as output high (6, PD7)
+    DDRD  |= B10000000; // output
+    PORTD |= B10000000; // high
     // Setup select pin as output high (5, PC6)
     DDRC  |= B01000000; // output
     PORTC |= B01000000; // high
 
-    // Setup input pins (A0,A1,A2,A3,14,15,16 or PF7,PF6,PF5,PF4,PB3,PB1,PB2)
+    // Setup input pins (A0,A1,A2,A3,14,15 or PF7,PF6,PF5,PF4,PB3,PB1)
     DDRF  &= ~B11110000; // input
     PORTF |=  B11110000; // high to enable internal pull-up
     DDRB  &= ~B00001010; // input
     PORTB |=  B00001010; // high to enable internal pull-up
-    // Setup input pins (TXO,RXI,2,3,4,6 or PD3,PD2,PD1,PD0,PD4,PD7)
-    DDRD  &= ~B10011111; // input
-    PORTD |=  B10011111; // high to enable internal pull-up
+    // Setup input pins (TXO,RXI,2,3,4,6 or PD3,PD2,PD1,PD0,PD4,PE6)
+    DDRD  &= ~B00011111; // input
+    PORTD |=  B00011111; // high to enable internal pull-up
+    DDRE  &= ~B01000000; // input
+    PORTE |=  B01000000; // high to enable internal pull-up
     
     _inputReg1 = 0;
     _inputReg2 = 0;
     _inputReg3 = 0;
+    _inputReg4 = 0;
     for(byte i=0; i<=1; i++)
     {
       _currentState[i] = 0;
@@ -77,7 +80,7 @@ word SegaControllers32U4::getStateMD1()
 
   // Set the select pin low/high
   _pinSelect[0] = !_pinSelect[0];
-  (!_pinSelect[0]) ? PORTB &= ~B00000100 : PORTB |= B00000100; // Set LOW on even cycle, HIGH on uneven cycle
+  (!_pinSelect[0]) ? PORTD &= ~B10000000 : PORTD |= B10000000; // Set LOW on even cycle, HIGH on uneven cycle
 
   // Short delay to stabilise outputs in controller
   delayMicroseconds(SC_CYCLE_DELAY);
@@ -166,6 +169,7 @@ word SegaControllers32U4::getStateMD2()
 
   // Read input register(s)
   _inputReg3 = PIND;
+  _inputReg4 = PINE;
 
   if(_ignoreCycles[1] <= 0)
   {
@@ -192,7 +196,7 @@ word SegaControllers32U4::getStateMD2()
           (bitRead(_inputReg3, DB9_PIN3_BIT2) == LOW) ? _currentState[1] |= SC_BTN_LEFT : _currentState[1] &= ~SC_BTN_LEFT;
           (bitRead(_inputReg3, DB9_PIN4_BIT2) == LOW) ? _currentState[1] |= SC_BTN_RIGHT : _currentState[1] &= ~SC_BTN_RIGHT;
           (bitRead(_inputReg3, DB9_PIN6_BIT2) == LOW) ? _currentState[1] |= SC_BTN_B : _currentState[1] &= ~SC_BTN_B;
-          (bitRead(_inputReg3, DB9_PIN9_BIT2) == LOW) ? _currentState[1] |= SC_BTN_C : _currentState[1] &= ~SC_BTN_C;
+          (bitRead(_inputReg4, DB9_PIN9_BIT2) == LOW) ? _currentState[1] |= SC_BTN_C : _currentState[1] &= ~SC_BTN_C;
         }
       }
       else // No Mega Drive controller is connected, use SMS/Atari mode
@@ -206,7 +210,7 @@ word SegaControllers32U4::getStateMD2()
         if (bitRead(_inputReg3, DB9_PIN3_BIT2) == LOW) { _currentState[1] |= SC_BTN_LEFT; }
         if (bitRead(_inputReg3, DB9_PIN4_BIT2) == LOW) { _currentState[1] |= SC_BTN_RIGHT; }
         if (bitRead(_inputReg3, DB9_PIN6_BIT2) == LOW) { _currentState[1] |= SC_BTN_A; }
-        if (bitRead(_inputReg3, DB9_PIN9_BIT2) == LOW) { _currentState[1] |= SC_BTN_B; }
+        if (bitRead(_inputReg4, DB9_PIN9_BIT2) == LOW) { _currentState[1] |= SC_BTN_B; }
       }
     }
     else // Select pin is LOW
@@ -223,7 +227,7 @@ word SegaControllers32U4::getStateMD2()
         if(!_sixButtonMode[1])
         {
           (bitRead(_inputReg3, DB9_PIN6_BIT2) == LOW) ? _currentState[1] |= SC_BTN_A : _currentState[1] &= ~SC_BTN_A;
-          (bitRead(_inputReg3, DB9_PIN9_BIT2) == LOW) ? _currentState[1] |= SC_BTN_START : _currentState[1] &= ~SC_BTN_START; 
+          (bitRead(_inputReg4, DB9_PIN9_BIT2) == LOW) ? _currentState[1] |= SC_BTN_START : _currentState[1] &= ~SC_BTN_START; 
         }
       }
     }

SegaTwoControllersUSB/SegaControllers32U4.h

@@ -56,7 +56,7 @@ enum
   DB9_PIN3_BIT2 = 1,
   DB9_PIN4_BIT2 = 0,
   DB9_PIN6_BIT2 = 4,
-  DB9_PIN9_BIT2 = 7
+  DB9_PIN9_BIT2 = 6
 };
 
 const byte SC_INPUT_PINS = 6;
@@ -83,6 +83,7 @@ class SegaControllers32U4 {
     byte _inputReg1;
     byte _inputReg2;
     byte _inputReg3;
+    byte _inputReg4;
 };
 
 #endif

SegaTwoControllersUSB/SegaTwoControllersUSB.ino

@@ -38,7 +38,7 @@
 //  3     A2  PF5
 //  4     A3  PF4
 //  6     14  PB3
-//  7     16  PB2 (6  PD7)
+//  7      6  PD7
 //  9     15  PB1
 
 //  1     TXO PD3
@@ -47,7 +47,7 @@
 //  4      3  PD0
 //  6      4  PD4
 //  7      5  PC6
-//  9      6  PD7
+//  9      7  PE6
 
 SegaControllers32U4 controllers;