mirror of
https://github.com/MickGyver/DaemonBite-Retro-Controllers-USB
synced 2024-10-31 15:45:07 -04:00
176 lines
5.1 KiB
C++
176 lines
5.1 KiB
C++
/* DaemonBite CD32 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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#define BUTTON_READ_DELAY 300 // Button read delay in µs
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// Controller DB9 pins (looking face-on to the end of the plug):
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//
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// 5 4 3 2 1
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// 9 8 7 6
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//
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// Wire it up according to the following table:
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//
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// DB9 Arduino Pro Micro
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// --------------------------------------
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// 1 TXO PD3
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// 2 RXI PD2
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// 3 3 PD0
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// 4 4 PD4
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// 5 A0 PF7
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// 6 6 PD7 (Important: Connect this pin via a 220Ω resistor!)
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// 7 VCC
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// 8 GND
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// 9 A1 PF6
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// -----------------
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// (Second controller port for future reference)
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// 1 15 PB1
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// 2 14 PB3
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// 3 16 PB2
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// 4 10 PB6
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// 5 A2 PF5
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// 6 7 PE6 (Important: Connect this pin via a 220Ω resistor!)
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// 7 VCC
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// 8 GND
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// 9 A3 PF4
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// Set up USB HID gamepad
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Gamepad_ Gamepad;
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bool usbUpdate = false; // Should gamepad data be sent to USB?
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// Controller
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uint8_t axes = 0;
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uint8_t axesPrev = 0;
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uint8_t buttons = 0;
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uint8_t buttonsPrev = 0;
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// Timing
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long microsNow = 0;
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long microsButtons = 0;
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// CD32 controller detection
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uint8_t detection = 0;
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void setup()
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{
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// Setup switch pin (2, PD1)
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DDRD &= ~B00000010; // input
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PORTD |= B00000010; // high to enable internal pull-up
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// Setup controller pins
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DDRD &= ~B10011101; // inputs
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PORTD |= B10011101; // high to enable internal pull-up
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DDRF &= ~B11000000; // input
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PORTF |= B11000000; // high to enable internal pull-up
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}
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void loop()
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{
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// Get current time
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microsNow = micros();
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// Read X and Y axes
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axes = ~(PIND & B00011101);
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// See if enough time has passed since last button read
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if(microsNow > microsButtons+BUTTON_READ_DELAY)
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{
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// Set pin 6 (clock, PD7) and pin 5 (latch, PF7) as output low
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PORTD &= ~B10000000; // low to disable internal pull-up (will become low when set as output)
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DDRD |= B10000000; // output
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PORTF &= ~B10000000; // low to disable internal pull-up (will become low when set as output)
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DDRF |= B10000000; // output
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delayMicroseconds(40);
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// Clear buttons
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buttons = 0;
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// Read buttons
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(PINF & B01000000) ? buttons &= ~B00000010 : buttons |= B00000010; // Blue (2)
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sendClock();
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(PINF & B01000000) ? buttons &= ~B00000001 : buttons |= B00000001; // Red (1)
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sendClock();
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(PINF & B01000000) ? buttons &= ~B00001000 : buttons |= B00001000; // Yellow (4)
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sendClock();
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(PINF & B01000000) ? buttons &= ~B00000100 : buttons |= B00000100; // Green (3)
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sendClock();
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(PINF & B01000000) ? buttons &= ~B00100000 : buttons |= B00100000; // RTrig (6)
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sendClock();
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(PINF & B01000000) ? buttons &= ~B00010000 : buttons |= B00010000; // LTrig (5)
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sendClock();
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(PINF & B01000000) ? buttons &= ~B01000000 : buttons |= B01000000; // Play (7)
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sendClock();
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(PINF & B01000000) ? detection |= B00000001 : detection &= ~B00000001; // First detection bit (should be 1)
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sendClock();
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(PINF & B01000000) ? detection |= B00000010 : detection &= ~B00000010; // Second detection bit (should be 0)
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// Set pin 5 (latch, PF7) and pin 6 (clock, PD7) as input with pull-ups
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DDRF &= ~B10000000; // input
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PORTF |= B10000000; // high to enable internal pull-up
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DDRD &= ~B10000000; // input
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PORTD |= B10000000; // high to enable internal pull-up
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delayMicroseconds(40);
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// Was a CD32 gamepad detected? If not, read button 1 and 2 "normally".
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if(detection != B0000001)
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buttons = ~( ((PIND & B10000000) >> 7) | ((PINF & B01000000) >> 5) | B11111100 );
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microsButtons = microsNow+400;
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}
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// Has any buttons changed state?
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if (buttons != buttonsPrev)
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{
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Gamepad._GamepadReport.buttons = buttons;
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buttonsPrev = buttons;
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usbUpdate = true;
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}
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// Has any axes changed state?
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if (axes != axesPrev)
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{
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Gamepad._GamepadReport.Y = ((axes & B00000100) >> 2) - ((axes & B00001000) >> 3);
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Gamepad._GamepadReport.X = ((axes & B00010000) >> 4) - (axes & B00000001);
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axesPrev = axes;
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usbUpdate = true;
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}
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// Update USB data if necessary
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if(usbUpdate)
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{
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Gamepad.send();
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usbUpdate = false;
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}
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}
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void sendClock()
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{
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// Send a clock pulse to pin 6 and wait
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PORTD |= B10000000; // Enable pull-up
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delayMicroseconds(10);
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PORTD &= ~B10000000; // Disable pull-up
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delayMicroseconds(40);
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}
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