/* DaemonBite Saturn USB Adapter * Author: Mikael Norrgård * * Copyright (c) 2020 Mikael Norrgård * * GNU GENERAL PUBLIC LICENSE * Version 3, 29 June 2007 * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * */ #include "Gamepad.h" #define GAMEPAD_COUNT 2 // Set to 1 or 2 depending if you want to make a 1 or 2 port adapter #define SELECT_PAUSE 3 // How many microseconds to wait after setting select lines? (2µs is enough according to the Saturn developer's manual) // 20µs is required for Retrobit wired controllers //#define RETROBIT // Uncomment to support the Retro Bit 2.4GHz controller (this will increase lag a lot) #define UP 0x01 #define DOWN 0x02 #define LEFT 0x04 #define RIGHT 0x08 // ATT: 20 chars max (including NULL at the end) according to Arduino source code. // Additionally serial number is used to differentiate arduino projects to have different button maps! const char *gp_serial = "SATURN to USB"; /* ------------------------------------------------------------------------- Saturn controller socket (looking face-on at the front of the socket): ___________________ / 1 2 3 4 5 6 7 8 9 \ |___________________| Saturn controller plug (looking face-on at the front of the controller plug): ___________________ / 9 8 7 6 5 4 3 2 1 \ |___________________| Saturn (P1) Arduino Pro Micro -------------------------------------- 1 VCC VCC 2 DATA1 2 PD1 3 DATA0 3 PD0 4 SEL1 15 PB1 (Shared with P2) 5 SEL0 14 PB3 (Shared with P2) 6 TL (5V) 4 PD4 7 DATA3 TXO PD3 8 DATA2 RXI PD2 9 GND GND Saturn (P2) Arduino Pro Micro -------------------------------------- 1 VCC VCC 2 DATA1 A2 PF5 3 DATA0 A3 PF4 4 SEL1 15 PB1 (Shared with P1) 5 SEL0 14 PB3 (Shared with P1) 6 TL (5V) 6 PD7 7 DATA3 A0 PF7 8 DATA2 A1 PF6 9 GND GND NOTE: The receiver of the Retro Bit 2.4GHz controller needs to be plugged in after the adapter has been connected to USB and the RETROBIT define needs to be uncommented. ------------------------------------------------------------------------- */ // Set up USB HID gamepads Gamepad_ Gamepad[GAMEPAD_COUNT]; // Controllers uint8_t buttons[2][2] = {{0,0},{0,0}}; uint8_t buttonsPrev[2][2] = {{0,0},{0,0}}; uint8_t gp = 0; void setup() { // Set D0-D3 as inputs and enable pull-up resistors (port1 data pins) DDRD &= ~B00001111; PORTD |= B00001111; // Set F4-F7 as inputs and enable pull-up resistors (port2 data pins) DDRF &= ~B11110000; PORTF |= B11110000; // Set D4 and D7 as inputs and enable pull-up resistors (port1/2 TL) DDRD &= ~B10010000; PORTD |= B10010000; // Set B1 and B3 as outputs and set them HIGH (select pins) PORTD |= B00001010; DDRB |= B00001010; // Wait for the controller(s) to settle delay(100); } void loop() { while(1) { // Clear button data buttons[0][0]=0; buttons[0][1]=0; buttons[1][0]=0; buttons[1][1]=0; // Read all button and axes states read3(); read2(); read1(); read4(); // Invert the readings so a 1 means a pressed button buttons[0][0] = ~buttons[0][0]; buttons[0][1] = ~buttons[0][1]; buttons[1][0] = ~buttons[1][0]; buttons[1][1] = ~buttons[1][1]; // Send data to USB if values have changed for(gp=0; gp> 1) - (buttons[gp][0] & UP); Gamepad[gp]._GamepadReport.X = ((buttons[gp][0] & RIGHT) >> 3) - ((buttons[gp][0] & LEFT) >> 2); buttonsPrev[gp][0] = buttons[gp][0]; buttonsPrev[gp][1] = buttons[gp][1]; Gamepad[gp].send(); } } #ifdef RETROBIT // This delay is needed for the retro bit 2.4GHz wireless controller, making it more or less useless with this adapter delay(17); #endif }} // Read R, X, Y, Z void read1() { PORTB &= ~B00001010; // Set select outputs to 00 delayMicroseconds(SELECT_PAUSE); buttons[0][1] |= (PIND & 0x0f) << 4; if(GAMEPAD_COUNT == 2) buttons[1][1] |= (PINF & 0xf0); } // Read ST, A, C, B void read2() { PORTB ^= B00001010; // Toggle select outputs (01->10 or 10->01) delayMicroseconds(SELECT_PAUSE); buttons[0][1] |= (PIND & 0x0f); if(GAMEPAD_COUNT == 2) buttons[1][1] |= (PINF & 0xf0)>>4; } // Read DR, DL, DD, DU void read3() { PORTB ^= B00000010; // Set select outputs to 10 from 11 (toggle) delayMicroseconds(SELECT_PAUSE); buttons[0][0] |= (PIND & 0x0f); if(GAMEPAD_COUNT == 2) buttons[1][0] |= (PINF & 0xf0) >> 4; } // Read L, *, *, * void read4() { PORTB |= B00001010; // Set select outputs to 11 delayMicroseconds(SELECT_PAUSE); buttons[0][0] |= (PIND & 0x0f) << 4; if(GAMEPAD_COUNT == 2) buttons[1][0] |= (PINF & 0xf0); }