mirror of
https://github.com/MickGyver/DaemonBite-Retro-Controllers-USB
synced 2024-11-14 05:15:24 -05:00
150 lines
4.2 KiB
C++
150 lines
4.2 KiB
C++
/* DaemonBite (S)NES Controllers to 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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// 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 = "NES/SNES to USB";
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#define GAMEPAD_COUNT 2 // NOTE: No more than TWO gamepads are possible at the moment due to a USB HID issue.
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#define BUTTON_READ_DELAY 300 // Button read delay in µs
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// Wire it all up according to the following table:
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//
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// NES SNES Arduino Pro Micro
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// --------------------------------------
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// VCC VCC (All gamepads)
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// GND GND (All gamepads)
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// OUT0 (LATCH) 2 (PD1, All gamepads)
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// CUP (CLOCK) 3 (PD0, All gamepads)
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// D1 (GP1: DATA) A0 (PF7, Gamepad 1)
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// D1 (GP2: DATA) A1 (PF6, Gamepad 2)
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// D1 (GP3: DATA) A2 (PF5, Gamepad 3)
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// D1 (GP4: DATA) A3 (PF4, Gamepad 4)
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const byte LATCH = 2;
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const byte CLOCK = 3;
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const byte DIN[4] = {A0,A1,A2,A3};
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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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uint32_t buttons[4] = {0,0,0,0};
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uint32_t buttons_old[4] = {0,0,0,0};
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uint8_t gp = 0;
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// Timing
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unsigned long microsButtons = 0;
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void setup()
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{
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for(gp=0; gp<4; gp++) pinMode(DIN[gp], INPUT_PULLUP);
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pinMode(LATCH, OUTPUT);
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pinMode(CLOCK, OUTPUT);
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digitalWrite(LATCH, LOW);
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digitalWrite(CLOCK, LOW);
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for(gp=0; gp<GAMEPAD_COUNT; gp++) Gamepad[gp].reset();
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}
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void loop()
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{
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// See if enough time has passed since last button read
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if((micros()-microsButtons) > BUTTON_READ_DELAY)
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{
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sendLatch();
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for(int i=0; i<32; i++)
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{
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for(gp=0; gp<4; gp++) buttons[gp] = (buttons[gp]>>1) | (((uint32_t)~digitalRead(DIN[gp]))<<31);
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sendClock();
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}
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microsButtons = micros();
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for(gp=0; gp<4; gp++)
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{
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if((buttons[gp] & 0xFF00) == 0xFF00) buttons[gp] &= 0xFF; // NES pad
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else if((buttons[gp] & 0xF000) == 0x2000) buttons[gp] = (buttons[gp] & 0xFFF) | ((buttons[gp]>>4) & 0xFFFF000); // SNES NTT;
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else buttons[gp] &= 0xFFF; // SNES generic
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}
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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] != buttons_old[gp])
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{
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buttons_old[gp] = buttons[gp];
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Gamepad[gp]._GamepadReport.buttons = (buttons[gp] & 0xF) | ((buttons[gp]>>4) & ~0xF);
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Gamepad[gp]._GamepadReport.hat = dpad2hat(buttons[gp]);
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Gamepad[gp].send();
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}
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}
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}
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}
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void sendLatch()
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{
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// Send a latch pulse to (S)NES controller(s)
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digitalWrite(LATCH, HIGH);
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delayMicroseconds(12);
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digitalWrite(LATCH, LOW);
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delayMicroseconds(6);
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}
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void sendClock()
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{
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// Send a clock pulse to (S)NES controller(s)
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digitalWrite(CLOCK, HIGH);
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delayMicroseconds(6);
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digitalWrite(CLOCK, LOW);
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delayMicroseconds(6);
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}
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#define UP 0x10
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#define DOWN 0x20
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#define LEFT 0x40
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#define RIGHT 0x80
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uint8_t dpad2hat(uint8_t dpad)
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{
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switch(dpad & (UP|DOWN|LEFT|RIGHT))
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{
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case UP: return 0;
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case UP|RIGHT: return 1;
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case RIGHT: return 2;
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case DOWN|RIGHT: return 3;
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case DOWN: return 4;
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case DOWN|LEFT: return 5;
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case LEFT: return 6;
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case UP|LEFT: return 7;
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}
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return 15;
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}
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