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Arduino-USB-HID-RetroJoystickAdapter
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//https://www.cs.cmu.edu/~chuck/infopg/segasix.txt
//DB9 (8=GND, 5=VCC): 1 2 3 4 5 6 7 8 9
const uint8_t inputPinsPort1[] = { 2, 3, 4, 5, 6, 7, 8, 0, 9};
const uint8_t inputPinsPort2[] = {10, 16, 14, 15, A0, A1, A2, 0, A3};
// if you use two DB9 connectors solded back to back on your ATmega32u4, you should use this inputs
//const uint8_t inputPinsPort1[] = { 2, 3, 4, 5, 6, 7, 8, 0, 9};
//const uint8_t inputPinsPort2[] = {15, A0, A1, A2, A3, 14, 16, 0, 10};
// yet another version (Images/sega_genesis_adapter.jpg)
//const uint8_t inputPinsPort1[] = { 5, 6, 7, 8, 9, 4, 2, 0, A2};
//const uint8_t inputPinsPort2[] = {10, 16, 14, 15, A0, 3, A3, 0, A1};
//#define DEBUG
inline void translateState(uint8_t *data, uint8_t *state) {
state[0] = ~data[0];
state[1] = 127;
state[2] = 127;
if (!bitRead(data[1], 0)) state[2] = 0; /* up */
if (!bitRead(data[1], 1)) state[2] = 255; /* down */
if (!bitRead(data[1], 2)) state[1] = 0; /* left */
if (!bitRead(data[1], 3)) state[1] = 255; /* right */
}
uint8_t J1BTN6 = 0;
uint8_t J2BTN6 = 0;
uint8_t plugged1 = 0;
uint8_t plugged2 = 0;
#include "HID.h"
#if ARDUINO < 10606
#error The Joystick2 library requires Arduino IDE 1.6.6 or greater. Please update your IDE.
#endif
#if !defined(USBCON)
#error The Joystick2 library can only be used with a USB MCU (e.g. Arduino Leonardo, Arduino Micro, etc.).
#endif
#if !defined(_USING_HID)
#error "legacy HID core (non pluggable)"
#endif
#define JOYSTICK_REPORT_ID 0x04
#define JOYSTICK2_REPORT_ID 0x05
#define JOYSTICK_DATA_SIZE 2
#define JOYSTICK_STATE_SIZE 3
//================================================================================
//================================================================================
// Joystick (Gamepad)
#define HIDDESC_MACRO(REPORT_ID) \
/* Joystick # */ \
0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */ \
0x09, 0x04, /* USAGE (Joystick) */ \
0xa1, 0x01, /* COLLECTION (Application) */ \
0x85, REPORT_ID, /* REPORT_ID */ \
/* 8 Buttons */ \
0x05, 0x09, /* USAGE_PAGE (Button) */ \
0x19, 0x01, /* USAGE_MINIMUM (Button 1) */ \
0x29, 0x08, /* USAGE_MAXIMUM (Button 8) */ \
0x15, 0x00, /* LOGICAL_MINIMUM (0) */ \
0x25, 0x01, /* LOGICAL_MAXIMUM (1) */ \
0x75, 0x01, /* REPORT_SIZE (1) */ \
0x95, 0x08, /* REPORT_COUNT (8) */ \
0x81, 0x02, /* INPUT (Data,Var,Abs) */ \
/* X and Y Axis */ \
0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */ \
0x09, 0x01, /* USAGE (Pointer) */ \
0xA1, 0x00, /* COLLECTION (Physical) */ \
0x09, 0x30, /* USAGE (x) */ \
0x09, 0x31, /* USAGE (y) */ \
0x15, 0x00, /* LOGICAL_MINIMUM (0) */ \
0x26, 0xff, 0x00, /* LOGICAL_MAXIMUM (255) */ \
0x75, 0x08, /* REPORT_SIZE (8) */ \
0x95, 0x02, /* REPORT_COUNT (2) */ \
0x81, 0x02, /* INPUT (Data,Var,Abs) */ \
0xc0, /* END_COLLECTION */ \
0xc0 /* END_COLLECTION */
static const uint8_t hidReportDescriptor[] PROGMEM = {
HIDDESC_MACRO(JOYSTICK_REPORT_ID),
HIDDESC_MACRO(JOYSTICK2_REPORT_ID)
};
class Joystick_ {
private:
uint8_t joystickId;
uint8_t reportId;
uint8_t olddata[JOYSTICK_DATA_SIZE];
uint8_t state[JOYSTICK_STATE_SIZE];
uint8_t flag;
public:
uint8_t type;
uint8_t data[JOYSTICK_DATA_SIZE];
Joystick_(uint8_t initJoystickId, uint8_t initReportId) {
// Setup HID report structure
static bool usbSetup = false;
if (!usbSetup) {
static HIDSubDescriptor node(hidReportDescriptor, sizeof(hidReportDescriptor));
HID().AppendDescriptor(&node);
usbSetup = true;
}
// Initalize State
joystickId = initJoystickId;
reportId = initReportId;
data[0] = 0;
data[1] = 0;
memcpy(olddata, data, JOYSTICK_DATA_SIZE);
translateState(data, state);
sendState(1);
}
void updateState() {
if (memcmp(olddata, data, JOYSTICK_DATA_SIZE)) {
memcpy(olddata, data, JOYSTICK_DATA_SIZE);
translateState(data, state);
flag = 1;
}
}
void sendState(uint8_t force = 0) {
if (flag || force) {
// HID().SendReport(Report number, array of values in same order as HID descriptor, length)
HID().SendReport(reportId, state, JOYSTICK_STATE_SIZE);
flag = 0;
}
}
};
Joystick_ Joystick[2] =
{
Joystick_(0, JOYSTICK_REPORT_ID),
Joystick_(1, JOYSTICK2_REPORT_ID)
};
//================================================================================
//================================================================================
#define MODE_SELECT_PORT1 inputPinsPort1[6]
#define MODE_SELECT_PORT2 inputPinsPort2[6]
#define VCC_PORT1 inputPinsPort1[4]
#define VCC_PORT2 inputPinsPort2[4]
void modeSelect(uint8_t m) {
digitalWrite(MODE_SELECT_PORT1, m);
digitalWrite(MODE_SELECT_PORT2, m);
delayMicroseconds(20);
}
void setup() {
for (uint8_t i = 0; i < 9; i++) {
if (inputPinsPort1[i] != 0 && i != 4 && i != 6)
pinMode(inputPinsPort1[i], INPUT_PULLUP);
if (inputPinsPort2[i] != 0 && i != 4 && i != 6)
pinMode(inputPinsPort2[i], INPUT_PULLUP);
} //without PULLUP every button are read as pressed down if controller is not connected.
pinMode(VCC_PORT1, OUTPUT);
pinMode(VCC_PORT2, OUTPUT);
digitalWrite(VCC_PORT1, HIGH);
digitalWrite(VCC_PORT2, HIGH);
pinMode(MODE_SELECT_PORT1, OUTPUT);
pinMode(MODE_SELECT_PORT2, OUTPUT);
modeSelect(HIGH);
#ifdef DEBUG
Serial.begin(9600);
#endif
}
void loop() {
Joystick[0].data[0] = 0xff;
Joystick[1].data[0] = 0xff;
Joystick[0].data[1] = 0xff;
Joystick[1].data[1] = 0xff;
modeSelect(LOW);
bitWrite(Joystick[0].data[1], 6, digitalRead(inputPinsPort1[2])); //detect1 j1
bitWrite(Joystick[0].data[1], 7, digitalRead(inputPinsPort1[3])); //detect2 j1
bitWrite(Joystick[1].data[1], 6, digitalRead(inputPinsPort2[2])); //detect1 j2
bitWrite(Joystick[1].data[1], 7, digitalRead(inputPinsPort2[3])); //detect2 j2
bitWrite(Joystick[0].data[0], 0, digitalRead(inputPinsPort1[5])); //A1
bitWrite(Joystick[0].data[0], 3, digitalRead(inputPinsPort1[8])); //Start1
bitWrite(Joystick[1].data[0], 0, digitalRead(inputPinsPort2[5])); //A2
bitWrite(Joystick[1].data[0], 3, digitalRead(inputPinsPort2[8])); //Start2
modeSelect(HIGH);
for (uint8_t i = 0; i < 4; i++) {
bitWrite(Joystick[0].data[1], i, digitalRead(inputPinsPort1[i])); //AXES1
bitWrite(Joystick[1].data[1], i, digitalRead(inputPinsPort2[i])); //AXES2
}
bitWrite(Joystick[0].data[0], 1, digitalRead(inputPinsPort1[5])); //B1
bitWrite(Joystick[0].data[0], 2, digitalRead(inputPinsPort1[8])); //C1
bitWrite(Joystick[1].data[0], 1, digitalRead(inputPinsPort2[5])); //B2
bitWrite(Joystick[1].data[0], 2, digitalRead(inputPinsPort2[8])); //C2
//read X,Y,Z,mode
modeSelect(LOW);
modeSelect(HIGH);
modeSelect(LOW);
modeSelect(HIGH);
if (J1BTN6) {
bitWrite(Joystick[0].data[0], 4, digitalRead(inputPinsPort1[2])); //X1
bitWrite(Joystick[0].data[0], 5, digitalRead(inputPinsPort1[1])); //Y1
bitWrite(Joystick[0].data[0], 6, digitalRead(inputPinsPort1[0])); //Z1
bitWrite(Joystick[0].data[0], 7, digitalRead(inputPinsPort1[3])); //mode
}
if (J2BTN6) {
bitWrite(Joystick[1].data[0], 4, digitalRead(inputPinsPort2[2])); //X1
bitWrite(Joystick[1].data[0], 5, digitalRead(inputPinsPort2[1])); //Y1
bitWrite(Joystick[1].data[0], 6, digitalRead(inputPinsPort2[0])); //Z1
bitWrite(Joystick[1].data[0], 7, digitalRead(inputPinsPort2[3])); //mode
}
//detect button mode and detect if controller is unplugged
uint8_t detect1 = !(Joystick[0].data[1] & B11000000);
if (!plugged1 && detect1) {
plugged1 = 1;
digitalWrite(VCC_PORT1, LOW);
delay(100);
digitalWrite(VCC_PORT1, HIGH);
if (!digitalRead(inputPinsPort1[0]) && !digitalRead(inputPinsPort1[1])) J1BTN6 = 1;
}
if (!detect1) {
plugged1 = 0;
J1BTN6 = 0;
}
//detect button mode and detect if controller is unplugged
uint8_t detect2 = !(Joystick[1].data[1] & B11000000);
if (!plugged2 && detect2) {
plugged2 = 1;
digitalWrite(VCC_PORT2, LOW);
delay(100);
digitalWrite(VCC_PORT2, HIGH);
if (!digitalRead(inputPinsPort2[0]) && !digitalRead(inputPinsPort2[1])) J2BTN6 = 1;
}
if (!detect2) {
plugged2 = 0;
J2BTN6 = 0;
}
#ifdef DEBUG
Serial.print(" data0 j1: 0x"); Serial.print(Joystick[0].data[0], HEX);
Serial.print(" data0 j2: 0x"); Serial.print(Joystick[1].data[0], HEX);
Serial.print(" data1 j1: 0x"); Serial.print(Joystick[0].data[1], HEX);
Serial.print(" data1 j2: 0x"); Serial.print(Joystick[1].data[1], HEX);
Serial.print(" 6btn j1: 0x"); Serial.print(J1BTN6, HEX);
Serial.print(" 6btn j2: 0x"); Serial.print(J2BTN6, HEX);
Serial.println();
delay(50);
Serial.flush();
#endif
Joystick[0].updateState();
Joystick[1].updateState();
Joystick[0].sendState();
Joystick[1].sendState();
delayMicroseconds(1000);
}