genesis2usb/controller_firmware.ino

#define SELECT 8
#define IN_SC 7
#define IN_AB 6
#define IN_LEFT 5
#define IN_RIGHT 4
#define IN_UP 3
#define IN_DOWN 2
#define STATUS 13
#define GETSTATE(pin,bitpos,buttons) digitalRead(pin) ? (buttons | (1<<bitpos) ) : (buttons & (buttons ^ (1<<bitpos)))
byte buttons = 0;
byte buttons_prev = 0;
byte buttons_other = 240;
byte buttons_other_prev = 0;
bool rmode = 1;
long int count = 0;
void setup() {
  Serial.begin(9600);
  digitalWrite(SELECT,HIGH);
  pinMode(SELECT, OUTPUT);
  pinMode(IN_SC, INPUT);
  pinMode(IN_AB, INPUT);
  pinMode(IN_LEFT, INPUT);
  pinMode(IN_RIGHT, INPUT);
  pinMode(IN_UP, INPUT);
  pinMode(IN_DOWN, INPUT);
  pinMode(STATUS, OUTPUT);
}
void loop() {
  rmode != rmode;
  count++;
  digitalWrite(SELECT,HIGH); //Pulse 1
  delay(5);
  buttons = GETSTATE(IN_AB,2,buttons); //B
  buttons = GETSTATE(IN_SC,3,buttons); //C
  buttons = GETSTATE(IN_LEFT,4,buttons); //Left
  buttons = GETSTATE(IN_RIGHT,5,buttons); //Right
  buttons = GETSTATE(IN_DOWN,6,buttons); //Down
  buttons = GETSTATE(IN_UP,7,buttons); //Up
  digitalWrite(SELECT,LOW);
  buttons = GETSTATE(IN_SC,0,buttons); //Start
  buttons = GETSTATE(IN_AB,1,buttons); //A
  digitalWrite(SELECT,HIGH); //Pulse 2
  digitalWrite(SELECT,LOW);
  digitalWrite(SELECT,HIGH); //Pulse 3
  digitalWrite(SELECT,LOW); //Pulse 4 (XYZ)
  digitalWrite(SELECT,HIGH); //XYZ Mode
  buttons_other = GETSTATE(IN_RIGHT,0,buttons_other); //Mode
  buttons_other = GETSTATE(IN_LEFT,1,buttons_other); //X
  buttons_other = GETSTATE(IN_DOWN,2,buttons_other); //Y
  buttons_other = GETSTATE(IN_UP,3,buttons_other); //Z
  digitalWrite(SELECT,LOW); //snussy mode
  //output only on change
  if (rmode && ((buttons_prev != buttons) || (buttons_other_prev != buttons_other))) {
    Serial.write(buttons);
    Serial.write(buttons_other);
    //Serial.println(buttons | buttons_other<<8,BIN);
    //Serial.println(,BIN);
  }
  buttons_other_prev = buttons_other;
  buttons_prev = buttons;      
}