SNES Control

Using Arduino Programming Questions
#1

Hello.
I’m trying to make an adapter using Arduino Uno, to connect my SNES Control at my USB port. I’m having some troubles with Serial.print inside the if().
Here’s my code:

#define CLOCK 3
#define STROBE 2
#define DATA 4

#define SNES_B       0b0000000000000001
#define SNES_Y       0b0000000000000010
#define SNES_SELECT  0b0000000000000100
#define SNES_START   0b0000000000001000
#define SNES_UP      0b0000000000010000
#define SNES_DOWN    0b0000000000100000
#define SNES_LEFT    0b0000000001000000
#define SNES_RIGHT   0b0000000010000000
#define SNES_A       0b0000000100000000
#define SNES_X       0b0000001000000000
#define SNES_L       0b0000010000000000
#define SNES_R       0b0000100000000000

int x;

unsigned int getSNESbuttons(int clock, int strobe, int data) {
  /*
    Mapping from http://www.gamesx.com/controldata/snesdat.htm
    | B | Y | Select | Start | Up | Down | Left | Right | A | X | L | R | N/A | N/A | N/A | N/A |
  */
  unsigned int fromController = 0b0000000000000000, i;
  

  //Do the strobe to start reading button values
  digitalWrite(strobe, HIGH);
  delayMicroseconds(12);
  digitalWrite(strobe, LOW);

  delayMicroseconds(6); //Wait for controller to start sending the button values 
  for (i = 0; i < 16; i++) {
    fromController |= digitalRead(data) << i; //read the value, shift it and store it as a bit on fromController

    //More one cycle on the clock pin...
    digitalWrite(clock, HIGH);
    delayMicroseconds(6);
    digitalWrite(clock, LOW);
    delayMicroseconds(6);
  }

  //return the read bits (16)
  return ~fromController;
}

void setup() {
  pinMode(CLOCK, OUTPUT);
  pinMode(STROBE, OUTPUT);
  pinMode(DATA, INPUT);
  Serial.begin(9600);
}

unsigned int buttonsPressed;
void loop() {
  buttonsPressed = getSNESbuttons(CLOCK, STROBE, DATA);
  if (buttonsPressed & SNES_UP) {
    Serial.print ("w");
  }
  else if (buttonsPressed & SNES_DOWN) {
    Serial.print ("s");
  }
  /* and continues.. */
  else {
  }

  if (buttonsPressed & SNES_A) {
    
  }
  else {
  }

}

If anyone could help me, I’ll aprecciate.

Thanks.

#2

What problem with the prints?

Mark

#3

I'm having some troubles

but I'm not telling what they are

Edit: is it perhaps that you don't really want all those "else"s?

#4

The prints isn't working. Inside the serial monitor is all blank when I press the buttons.

#5

You probably don't want the if-else at all, unless you never want to detect multiple button presses.

Add a print statement after the pulseIn() to see what value you are getting for buttonsPressed.

#6