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7.0 KiB

OpenRetroPad

Adapt various input devices to various output devices.

Currently supported inputs: SNES/NES, Sega Genesis/Megadrive/Atari, Sega Saturn, Playstation (and PS2) Digital and Dual shock, Nintendo 64, Nintendo Gamecube, Nintendo Wii Nunchuck/Wii Classic/SNES+NES Mini

Currently supported outputs: bluetooth-hid gamepad, usb-hid gamepad, nintendo switch usb gamepad, wireless usb-hid gamepad over radio

OpenRetroPad is written and tested on an Arduino Pro Micro and an ESP32, there is also an in-progress custom PCB being developed at OpenRetroPadHW

Build using PlatformIO using pio run or pio run -e $board-$input-$output for a specific target/env.

env's are laid out like $board-$input-$output supported values:

  • $board: micro, esp32
  • $input: snes, genesis, saturn, psx, n64, gc, wii, radio, debug
  • $output: radio, usb, usbradio, switchusb, bt, debug
  • please note not all boards are compatible with all inputs/outputs, for example esp32 can only do bt, micro can only do radio or usb

Pics

My controllers and adapters I used to build+test this (and play with, of course!)

NES, SNES, Genesis 3, Genesis 6 controllers N64, PS2, GameCube, Dreamcast controllers

Wiring

(quick plea: if you are good at drawing diagrams, please help!)

DB-25 Pinout

DB-25 Pins Arduino Pro Micro GPIO ESP32 GPIO Radio SNES PSX N64 Gamecube Genesis Dreamcast Saturn Wii Ext
1 TX 1 19 - LATCH - - - P1-1 P1-DATA1 P1-7 -
2 SDA 2 21 - CLOCK DATA P1-DATA P1-DATA P1-3 P1-DATA5 P1-2 SDA
3 SCL 3 22 - P1-DATA CMD - - P1-4 - P1-3 SCL
4 Analog 4 15 - P2-DATA ATT - - P1-6 - P1-6 -
5 Digital 5 16 - P3-DATA CLK - - P1-7 - PX-5 -
6 Analog 6 2 - P4-DATA - - - P1-9 - PX-4 -
7 Digital 7 17 CE - - - - P2-7* - - -
8 Analog 8 4 CSN - - - - - - - -
9 Analog 9 > 1k Ω 35 > 1k Ω - 330 Ω 100 Ω 220 Ω 680 Ω 470 Ω 820 Ω 1000 Ω 1500 Ω
10 Analog 10 32 - - - - - - - P2-6 -
11 RX 0 18 - - - - - P1-2 - P1-8 -
12 - - - - - - - - - - - -
13 - - - - - - - - - - - -
14 MISO 14 12 MISO - - - - P2-6* - - -
15 SCLK 15 14 SCLK - - - - P2-9* - - -
16 MOSI 16 13 MOSI - - - - - - - -
17 - - - - - - - - - - - -
18 Analog 18 27 - - - - - P2-1 - P2-7 -
19 Analog 19 26 - - - - - P2-2 - P2-8 -
20 Analog 20 25 - - - - - P2-3 - P2-2 -
21 Analog 21 33 - - - - - P2-4 - P2-3 -
22 - - - - - - - - - - - SENSE
23 3.3V VCC - 3.3V VCC 3.3V VCC - - 3.3V VCC 3.3V VCC - - - 3.3V VCC
24 5V VCC 5V VCC OUT 5V VCC 5V VCC 5V VCC 5V VCC - 5V VCC PX-5 5V VCC 5V VCC PX-1 5V VCC -
25 GND GND GND GND GND - GND GND PX-8 GND GND PX-9 GND GND
  • 2nd player Genesis is incompatible with Radio because it uses the same pins, 1 player Genesis is compatible

Ω This is optional and only used for dongle detection. On the microcontroller side, put a 1k resistor between DB-25 pin 9 and VCC (3.3v for ESP32, 5V for Micro). On each controller dongle, put a resistor of the given value between DB-25 pin 9 and GND.

All connected pins can also function as Digital pins.

Code and/or inspiration was (or will be) taken from these places, in no particular order: