genesis example

Author: arpruss

examples/GenesisToXBox360/GenesisToXBox360.ino

@@ -0,0 +1,68 @@
+#include <USBXBox360.h>
+#include <GameControllers.h>
+
+// NB: connect A10 to TX, A9 to RX
+
+GenesisController gen(PA0, PA1, PA2, PA3, PA4, PA5, PA6);
+USBXBox360 XBox360;
+GameControllerData_t data;
+
+#define XBOX_A 13
+#define XBOX_B 14
+#define XBOX_X 15
+#define XBOX_Y 16
+#define XBOX_DUP 1
+#define XBOX_DDOWN 2
+#define XBOX_DLEFT 3
+#define XBOX_DRIGHT 4
+#define XBOX_START 5
+#define XBOX_LSHOULDER 9
+#define XBOX_RSHOULDER 10
+#define XBOX_GUIDE  11
+
+const uint16_t remap_retroarch[16] = {
+  XBOX_B, // A
+  XBOX_A, // B
+  XBOX_X, // C
+  XBOX_LSHOULDER, // X
+
+  XBOX_Y, // Y
+  XBOX_RSHOULDER, // Z
+  XBOX_START, // START
+  XBOX_GUIDE, // MODE
+
+  XBOX_DLEFT, // LEFT
+  XBOX_DRIGHT, // RIGHT
+  XBOX_DDOWN, // DOWN
+  XBOX_DUP, // UP
+
+  0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF
+};
+
+const uint16_t* remap = remap_retroarch;
+
+inline int16_t range10u16s(uint16_t x) {
+  return (((int32_t)(uint32_t)x - 512) * 32767 + 255) / 512;
+}
+
+void setup() {
+  gen.begin();
+  USBComposite.setProductString("GenesisToXBox360");
+  XBox360.begin();
+  XBox360.setManualReportMode(true);
+}
+
+void loop() {
+  if (gen.read(&data)) {
+    XBox360.X(range10u16s(data.joystickX));
+    XBox360.Y(-range10u16s(data.joystickY));
+    uint16_t mask = 1;
+    for (int i = 0; i < 16; i++, mask <<= 1) {
+      uint16_t xb = remap[i];
+      if (xb != 0xFFFF)
+        XBox360.button(xb, 0 != (data.buttons & mask));
+    }
+    XBox360.send();
+  }
+}
+

src/GameControllers.h

@@ -34,11 +34,25 @@ const uint16_t gcmaskDLeft = 0x100;
 const uint16_t gcmaskDRight = 0x200;
 const uint16_t gcmaskDDown = 0x400;
 const uint16_t gcmaskDUp = 0x800;
+const uint16_t gcmaskZ = 0x1000;
+const uint16_t gcmaskR = 0x2000;
+const uint16_t gcmaskL = 0x4000;
+
 const uint16_t gcmaskDPad = 0xF00;
 const uint16_t gcmaskStart = 0x10;
-const uint16_t buttonMaskC = 0x20;
-const uint16_t buttonMaskZ = 0x40;
-const uint16_t buttonMaskMode = 0x80;
+
+const uint16_t segaMaskA = 1;
+const uint16_t segaMaskB = 2;
+const uint16_t segaMaskC = 4;
+const uint16_t segaMaskX = 8;
+const uint16_t segaMaskY = 16;
+const uint16_t segaMaskZ = 32;
+const uint16_t segaMaskStart = 64;
+const uint16_t segaMaskMode = 128;
+const uint16_t segaMaskLeft = gcmaskDLeft;
+const uint16_t segaMaskRight = gcmaskDRight;
+const uint16_t segaMaskDown = gcmaskDDown;
+const uint16_t segaMaskUp = gcmaskDUp;
 
 typedef struct {
   uint16_t buttons;

src/genesis.cpp

@@ -25,14 +25,14 @@ bool GenesisController::read(GameControllerData_t* data) {
     data->cX = 512;
     data->cY = 512;
     if (state & SC_CTL_ON) {
-        data->buttons = ( (state & SC_BTN_A) ? gcmaskA : 0 ) |
-                        ( (state & SC_BTN_B) ? gcmaskB : 0 ) |
-                        ( (state & SC_BTN_C) ? buttonMaskC : 0 ) |
-                        ( (state & SC_BTN_X) ? gcmaskX : 0 ) |
-                        ( (state & SC_BTN_Y) ? gcmaskY : 0 ) |
-                        ( (state & SC_BTN_Z) ? buttonMaskZ : 0 ) |
-                        ( (state & SC_BTN_MODE) ? buttonMaskMode : 0 ) |
-                        ( (state & SC_BTN_START) ? gcmaskStart : 0);
+        data->buttons = ( (state & SC_BTN_A) ? segaMaskA : 0 ) |
+                        ( (state & SC_BTN_B) ? segaMaskB : 0 ) |
+                        ( (state & SC_BTN_C) ? segaMaskC : 0 ) |
+                        ( (state & SC_BTN_X) ? segaMaskX : 0 ) |
+                        ( (state & SC_BTN_Y) ? segaMaskY : 0 ) |
+                        ( (state & SC_BTN_Z) ? segaMaskZ : 0 ) |
+                        ( (state & SC_BTN_MODE) ? segaMaskMode : 0 ) |
+                        ( (state & SC_BTN_START) ? segaMaskStart : 0);
         if (dpadToJoystick) {
             if (state & SC_BTN_LEFT) 
                 data->joystickX = 0;
@@ -45,10 +45,10 @@ bool GenesisController::read(GameControllerData_t* data) {
                 data->joystickY = 1023;
         }
         else {
-            data->buttons |= ( (state & SC_BTN_UP) ? gcmaskDUp : 0 ) |
-                             ( (state & SC_BTN_DOWN) ? gcmaskDUp : 0 ) |
-                             ( (state & SC_BTN_LEFT) ? gcmaskDLeft : 0 ) |
-                             ( (state & SC_BTN_RIGHT) ? gcmaskDRight : 0 );
+            data->buttons |= ( (state & SC_BTN_UP) ? segaMaskUp : 0 ) |
+                             ( (state & SC_BTN_DOWN) ? segaMaskDown : 0 ) |
+                             ( (state & SC_BTN_LEFT) ? segaMaskLeft : 0 ) |
+                             ( (state & SC_BTN_RIGHT) ? segaMaskRight : 0 );
         }
         return true;
     }