186 lines
5.6 KiB
C++
186 lines
5.6 KiB
C++
/* DaemonBite Saturn USB Adapter
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* Author: Mikael Norrgård <mick@daemonbite.com>
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*
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* Copyright (c) 2020 Mikael Norrgård <http://daemonbite.com>
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*
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* GNU GENERAL PUBLIC LICENSE
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* Version 3, 29 June 2007
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include "Gamepad.h"
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#define GAMEPAD_COUNT 2 // Set to 1 or 2 depending if you want to make a 1 or 2 port adapter
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#define SELECT_PAUSE 20 // How many microseconds to wait after setting select lines? (2µs is enough according to the Saturn developer's manual)
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// 20µs is a "safe" value that seems to work for original Saturn controllers and Retrobit wired controllers
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//#define RETROBIT_WL // Uncomment to support the Retro Bit 2.4GHz wireless controller (this will increase lag a lot)
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#define UP 0x01
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#define DOWN 0x02
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#define LEFT 0x04
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#define RIGHT 0x08
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// ATT: 20 chars max (including NULL at the end) according to Arduino source code.
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// Additionally serial number is used to differentiate arduino projects to have different button maps!
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const char *gp_serial = "SATURN to USB";
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/* -------------------------------------------------------------------------
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Saturn controller socket (looking face-on at the front of the socket):
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___________________
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/ 1 2 3 4 5 6 7 8 9 \
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|___________________|
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Saturn controller plug (looking face-on at the front of the controller plug):
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___________________
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/ 9 8 7 6 5 4 3 2 1 \
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|___________________|
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Saturn (P1) Arduino Pro Micro
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--------------------------------------
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1 VCC VCC
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2 DATA1 2 PD1
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3 DATA0 3 PD0
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4 SEL1 15 PB1 (Shared with P2)
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5 SEL0 14 PB3 (Shared with P2)
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6 TL (5V) 4 PD4
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7 DATA3 TXO PD3
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8 DATA2 RXI PD2
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9 GND GND
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Saturn (P2) Arduino Pro Micro
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--------------------------------------
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1 VCC VCC
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2 DATA1 A2 PF5
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3 DATA0 A3 PF4
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4 SEL1 15 PB1 (Shared with P1)
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5 SEL0 14 PB3 (Shared with P1)
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6 TL (5V) 6 PD7
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7 DATA3 A0 PF7
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8 DATA2 A1 PF6
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9 GND GND
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NOTE: The receiver of the Retro Bit 2.4GHz controller needs to be plugged
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in after the adapter has been connected to USB and the RETROBIT_WL
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define needs to be uncommented.
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------------------------------------------------------------------------- */
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// Set up USB HID gamepads
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Gamepad_ Gamepad[GAMEPAD_COUNT];
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// Controllers
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uint8_t buttons[2][2] = {{0,0},{0,0}};
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uint8_t buttonsPrev[2][2] = {{0,0},{0,0}};
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uint8_t gp = 0;
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void setup()
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{
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// Set D0-D3 as inputs and enable pull-up resistors (port1 data pins)
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DDRD &= ~B00001111;
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PORTD |= B00001111;
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// Set F4-F7 as inputs and enable pull-up resistors (port2 data pins)
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DDRF &= ~B11110000;
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PORTF |= B11110000;
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// Set D4 and D7 as inputs and enable pull-up resistors (port1/2 TL)
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DDRD &= ~B10010000;
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PORTD |= B10010000;
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// Set B1 and B3 as outputs and set them HIGH (select pins)
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PORTD |= B00001010;
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DDRB |= B00001010;
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// Wait for the controller(s) to settle
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delay(100);
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}
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void loop() { while(1)
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{
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// Clear button data
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buttons[0][0]=0; buttons[0][1]=0;
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buttons[1][0]=0; buttons[1][1]=0;
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// Read all button and axes states
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read3();
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read2();
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read1();
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read4();
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// Invert the readings so a 1 means a pressed button
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buttons[0][0] = ~buttons[0][0]; buttons[0][1] = ~buttons[0][1];
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buttons[1][0] = ~buttons[1][0]; buttons[1][1] = ~buttons[1][1];
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// Send data to USB if values have changed
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for(gp=0; gp<GAMEPAD_COUNT; gp++)
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{
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// Has any buttons changed state?
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if (buttons[gp][0] != buttonsPrev[gp][0] || buttons[gp][1] != buttonsPrev[gp][1] )
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{
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Gamepad[gp]._GamepadReport.buttons = buttons[gp][1] | ((buttons[gp][0] & 0x80)<<1);
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Gamepad[gp]._GamepadReport.Y = ((buttons[gp][0] & DOWN) >> 1) - (buttons[gp][0] & UP);
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Gamepad[gp]._GamepadReport.X = ((buttons[gp][0] & RIGHT) >> 3) - ((buttons[gp][0] & LEFT) >> 2);
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buttonsPrev[gp][0] = buttons[gp][0];
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buttonsPrev[gp][1] = buttons[gp][1];
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Gamepad[gp].send();
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}
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}
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#ifdef RETROBIT_WL
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// This delay is needed for the retro bit 2.4GHz wireless controller, making it more or less useless with this adapter
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delay(17);
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#endif
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}}
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// Read R, X, Y, Z
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void read1()
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{
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PORTB &= ~B00001010; // Set select outputs to 00
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delayMicroseconds(SELECT_PAUSE);
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buttons[0][1] |= (PIND & 0x0f) << 4;
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if(GAMEPAD_COUNT == 2)
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buttons[1][1] |= (PINF & 0xf0);
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}
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// Read ST, A, C, B
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void read2()
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{
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PORTB ^= B00001010; // Toggle select outputs (01->10 or 10->01)
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delayMicroseconds(SELECT_PAUSE);
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buttons[0][1] |= (PIND & 0x0f);
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if(GAMEPAD_COUNT == 2)
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buttons[1][1] |= (PINF & 0xf0)>>4;
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}
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// Read DR, DL, DD, DU
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void read3()
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{
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PORTB ^= B00000010; // Set select outputs to 10 from 11 (toggle)
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delayMicroseconds(SELECT_PAUSE);
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buttons[0][0] |= (PIND & 0x0f);
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if(GAMEPAD_COUNT == 2)
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buttons[1][0] |= (PINF & 0xf0) >> 4;
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}
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// Read L, *, *, *
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void read4()
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{
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PORTB |= B00001010; // Set select outputs to 11
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delayMicroseconds(SELECT_PAUSE);
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buttons[0][0] |= (PIND & 0x0f) << 4;
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if(GAMEPAD_COUNT == 2)
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buttons[1][0] |= (PINF & 0xf0);
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} |