From cbfaef67b2363d0678bcc868cb8985c519001519 Mon Sep 17 00:00:00 2001
From: Pedro de Oliveira <falsovsky@gmail.com>
Date: Sat, 13 Sep 2014 00:43:02 +0100
Subject: [PATCH] My attempt at a SNES controller as a Windoze Joystick

Based on https://github.com/njguibert/NesJoystickArduino/
---
 snes_controller/snes_controller.ino | 153 ++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 snes_controller/snes_controller.ino

diff --git a/snes_controller/snes_controller.ino b/snes_controller/snes_controller.ino
new file mode 100644
index 0000000..054cd9a
--- /dev/null
+++ b/snes_controller/snes_controller.ino
@@ -0,0 +1,153 @@
+static int latch = 12; // set the latch pin
+static int clock = 13; // set the clock pin
+static int datin = 11;// set the data in pin
+
+boolean btn_up    = false;
+boolean btn_down  = false;
+boolean btn_left  = false;
+boolean btn_right = false;
+
+JoyState_t joySt;
+
+/* SETUP */
+void setup() {
+  //Serial.begin(9600);
+  
+  pinMode(latch,OUTPUT);
+  pinMode(clock,OUTPUT);
+  pinMode(datin,INPUT);
+
+  digitalWrite(latch,HIGH);
+  digitalWrite(clock,HIGH);
+
+  // Set joystick initial state
+  joySt.xAxis = 127;
+  joySt.yAxis = 127;
+  joySt.zAxis = 127;
+  joySt.buttons = 0;
+}
+
+/* THIS READS DATA FROM THE CONTROLLER */
+word controllerRead() {
+  word data = 0;
+
+  digitalWrite(latch,LOW);
+  digitalWrite(clock,LOW);
+
+  digitalWrite(latch,HIGH);
+  delayMicroseconds(2);
+  digitalWrite(latch,LOW);
+
+  data = digitalRead(datin);
+
+  for (int i = 1; i <= 15; i ++) {
+    digitalWrite(clock,HIGH);
+    delayMicroseconds(2);
+    data = data << 1;
+    data = data + digitalRead(datin) ;
+    delayMicroseconds(2);
+    digitalWrite(clock,LOW);
+  }
+
+  return data;
+}
+
+void loop() {
+  word controller_data = controllerRead();
+
+  // B - BIT 16
+  if (bitRead(controller_data, 15) == 0)
+    joySt.buttons = joySt.buttons | 1;
+  else
+    joySt.buttons = joySt.buttons & 254;
+
+  // Y - BIT 15
+  if (bitRead(controller_data, 14) == 0)
+    joySt.buttons = joySt.buttons | 2;
+  else
+    joySt.buttons = joySt.buttons & 253;
+
+  // SELECT - BIT 14
+  if (bitRead(controller_data, 13) == 0)
+    joySt.buttons = joySt.buttons | 64;
+  else
+    joySt.buttons = joySt.buttons & 191;
+
+  // START - BIT 13
+  if (bitRead(controller_data, 12) == 0)
+    joySt.buttons = joySt.buttons | 128;
+  else
+    joySt.buttons = joySt.buttons & 127;
+
+  // UP - BIT 12
+  if (bitRead(controller_data, 11) == 0 && !btn_up) {
+    btn_up = true;
+    joySt.yAxis = 0;
+  }
+
+  if (bitRead(controller_data, 11) == 1 && btn_up) {
+    btn_up = false;
+    joySt.yAxis = 127;
+  }
+
+  // DOWN - BIT 11
+  if (bitRead(controller_data, 10) == 0 && !btn_down) {
+    btn_down = true;
+    joySt.yAxis = 255;
+  }
+
+  if (bitRead(controller_data, 10) == 1 && btn_down) {
+    btn_down = false;
+    joySt.yAxis = 127;
+  }
+
+  // LEFT - BIT 10
+  if (bitRead(controller_data, 9) == 0 && !btn_left) {
+    btn_left = true;
+    joySt.xAxis = 0;
+  }
+
+  if (bitRead(controller_data, 9) == 1 && btn_left) {
+    btn_left = false;
+    joySt.xAxis = 127;
+  }
+
+  // RIGHT - BIT 9
+  if (bitRead(controller_data, 8) == 0 && !btn_right) {
+    btn_right = true;
+    joySt.xAxis = 255;
+  }
+
+  if (bitRead(controller_data, 8) == 1 && btn_right) {
+    btn_right = false;
+    joySt.xAxis = 127;
+  }
+
+  // A - BIT 8
+  if (bitRead(controller_data, 7) == 0)
+    joySt.buttons = joySt.buttons | 4;
+  else 
+    joySt.buttons = joySt.buttons & 251;
+
+  // X - BIT 7
+  if (bitRead(controller_data, 6) == 0)
+    joySt.buttons = joySt.buttons | 8;
+  else
+    joySt.buttons = joySt.buttons & 247;
+
+
+  // L - BIT 6
+  if (bitRead(controller_data, 5) == 0)
+    joySt.buttons = joySt.buttons | 16;
+  else
+    joySt.buttons = joySt.buttons & 239;
+
+  // R - BIT 5
+  if (bitRead(controller_data, 4) == 0)
+    joySt.buttons = joySt.buttons | 32;
+  else
+    joySt.buttons = joySt.buttons & 223;
+
+  Joystick.setState(&joySt);
+
+}