mirror of
https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter
synced 2024-11-14 05:05:01 -05:00
127 lines
2.7 KiB
C++
127 lines
2.7 KiB
C++
/*
|
|
* Simple Atari joystick adapter (keyboard HID) for learning purposes
|
|
* McGurk 6.9.2016
|
|
*/
|
|
|
|
#include <Keyboard.h>;
|
|
// List of special keys: https://www.arduino.cc/en/Reference/KeyboardModifiers
|
|
|
|
// Here we define Arduino pins we use. Along with these we have to connect joystick ground to Arduino GND.
|
|
// Because of Arduino internal pullup resistor off state is 1. Moving joystick switches corresponding pin to ground and then it is 0.
|
|
#define UP 2 // 9-pin D-connector pin 1
|
|
#define DOWN 3 // 9-pin D-connector pin 2
|
|
#define LEFT 4 // 9-pin D-connector pin 3
|
|
#define RIGHT 5 // 9-pin D-connector pin 4
|
|
#define BUTTON 6 // 9-pin D-connector pin 6
|
|
// 9-pin D-connector pin 8 to GND
|
|
|
|
|
|
// We keep record how everything was last time, so we can compare if anything have changed. (1 = off, 0 = on)
|
|
byte lastUP = 1;
|
|
byte lastDOWN = 1;
|
|
byte lastLEFT = 1;
|
|
byte lastRIGHT = 1;
|
|
byte lastBUTTON = 1;
|
|
|
|
byte newUP = 1;
|
|
byte newDOWN = 1;
|
|
byte newLEFT = 1;
|
|
byte newRIGHT = 1;
|
|
byte newBUTTON = 1;
|
|
|
|
|
|
void setup() {
|
|
|
|
pinMode(UP, INPUT_PULLUP);
|
|
pinMode(DOWN, INPUT_PULLUP);
|
|
pinMode(LEFT, INPUT_PULLUP);
|
|
pinMode(RIGHT, INPUT_PULLUP);
|
|
pinMode(BUTTON, INPUT_PULLUP);
|
|
|
|
Keyboard.begin();
|
|
|
|
}
|
|
|
|
// We use this flag to indicate if anything changes.
|
|
byte flag = 0;
|
|
|
|
|
|
void loop()
|
|
{
|
|
|
|
// Read joystick state (1 = off, 0 = on).
|
|
newUP = digitalRead(UP);
|
|
newDOWN = digitalRead(DOWN);
|
|
newLEFT = digitalRead(LEFT);
|
|
newRIGHT = digitalRead(RIGHT);
|
|
newBUTTON = digitalRead(BUTTON);
|
|
|
|
|
|
// Check if anything changed. This way we don't have to send anything to USB, if nothing changes.
|
|
|
|
if (newUP != lastUP) {
|
|
lastUP = newUP;
|
|
flag = 1;
|
|
}
|
|
|
|
if (newDOWN != lastDOWN) {
|
|
lastDOWN = newDOWN;
|
|
flag = 1;
|
|
}
|
|
|
|
if (newLEFT != lastLEFT) {
|
|
lastLEFT = newLEFT;
|
|
flag = 1;
|
|
}
|
|
|
|
if (newRIGHT != lastRIGHT) {
|
|
lastRIGHT = newRIGHT;
|
|
flag = 1;
|
|
}
|
|
|
|
if (newBUTTON != lastBUTTON) {
|
|
lastBUTTON = newBUTTON;
|
|
flag = 1;
|
|
}
|
|
|
|
// If anythings changed, send new state.
|
|
if (flag) {
|
|
|
|
// Press or release keyboard button according what we read earlier.
|
|
// We need exclamation mark in these if-conditions, because swithes are active low (0 = on, 1 = off).
|
|
if (!newUP) {
|
|
Keyboard.press('w');
|
|
} else {
|
|
Keyboard.release('w');
|
|
}
|
|
if (!newDOWN) {
|
|
Keyboard.press('s');
|
|
} else {
|
|
Keyboard.release('s');
|
|
}
|
|
if (!newLEFT) {
|
|
Keyboard.press('a');
|
|
} else {
|
|
Keyboard.release('a');
|
|
}
|
|
if (!newRIGHT) {
|
|
Keyboard.press('d');
|
|
} else {
|
|
Keyboard.release('d');
|
|
}
|
|
if (!newBUTTON) {
|
|
Keyboard.press('e');
|
|
} else {
|
|
Keyboard.release('e');
|
|
}
|
|
|
|
// Remember to clear flag.
|
|
flag = 0;
|
|
|
|
}
|
|
|
|
// Little 1ms breathing break.
|
|
delayMicroseconds(1000);
|
|
|
|
}
|