mirror of
https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter
synced 2024-11-24 10:02:18 -05:00
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/*
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* Simple Atari joystick adapter (joystick HID) for learning purposes
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* McGurk 6.9.2016
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*/
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#include "Joystick2.h"
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// Here we define Arduino pins we use. Along with these we have to connect joystick ground to Arduino GND.
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// Because of Arduino internal pullup resistor off state is 1. Moving joystick switches corresponding pin to ground and then it is 0.
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#define UP 2 // 9-pin D-connector pin 1
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#define DOWN 3 // 9-pin D-connector pin 2
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#define LEFT 4 // 9-pin D-connector pin 3
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#define RIGHT 5 // 9-pin D-connector pin 4
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#define BUTTON 6 // 9-pin D-connector pin 6
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// 9-pin D-connector pin 8 to GND
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// We keep record how everything was last time, so we can compare if anything have changed. (1 = off, 0 = on)
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byte lastUP = 1;
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byte lastDOWN = 1;
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byte lastLEFT = 1;
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byte lastRIGHT = 1;
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byte lastBUTTON = 1;
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byte newUP = 1;
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byte newDOWN = 1;
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byte newLEFT = 1;
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byte newRIGHT = 1;
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byte newBUTTON = 1;
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void setup() {
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pinMode(UP, INPUT_PULLUP);
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pinMode(DOWN, INPUT_PULLUP);
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pinMode(LEFT, INPUT_PULLUP);
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pinMode(RIGHT, INPUT_PULLUP);
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pinMode(BUTTON, INPUT_PULLUP);
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Joystick[0].begin(false);
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}
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// We use this flag to indicate if anything changes.
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byte flag = 0;
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void loop()
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{
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// Read joystick state (1 = off, 0 = on).
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newUP = digitalRead(UP);
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newDOWN = digitalRead(DOWN);
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newLEFT = digitalRead(LEFT);
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newRIGHT = digitalRead(RIGHT);
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newBUTTON = digitalRead(BUTTON);
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// Check if anything changed. This way we don't have to send anything to USB if nothing happened after last time.
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if (newUP != lastUP) {
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lastUP = newUP;
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flag = 1;
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}
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if (newDOWN != lastDOWN) {
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lastDOWN = newDOWN;
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flag = 1;
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}
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if (newLEFT != lastLEFT) {
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lastLEFT = newLEFT;
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flag = 1;
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}
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if (newRIGHT != lastRIGHT) {
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lastRIGHT = newRIGHT;
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flag = 1;
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}
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if (newBUTTON != lastBUTTON) {
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lastBUTTON = newBUTTON;
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flag = 1;
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}
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// If anythings changed, build and send new state.
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if (flag) {
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// Clear directions and buttons before start building new state.
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Joystick[0].setYAxis(0);
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Joystick[0].setXAxis(0);
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Joystick[0].setButton(0, 0);
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// Build new state according what we read earlier.
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// We need exclamation mark in these if-conditions, because swithes are active low (0 = on, 1 = off).
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if (!newUP) {
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Joystick[0].setYAxis(-127); //UP
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}
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if (!newDOWN) {
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Joystick[0].setYAxis(127); //DOWN
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}
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if (!newLEFT) {
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Joystick[0].setXAxis(-127); //LEFT
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}
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if (!newRIGHT) {
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Joystick[0].setXAxis(127); //RIGHT
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}
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if (!newBUTTON) {
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Joystick[0].setButton(0, 1); //BUTTON
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}
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// Everything is ready. Send state. Before this point, we haven't send any joystick directions to USB.
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Joystick[0].sendState();
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// Remember to clear flag.
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flag = 0;
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}
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// Little 1ms breathing break.
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delayMicroseconds(1000);
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}
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