148 lines
5.0 KiB
C++
148 lines
5.0 KiB
C++
/* DaemonBite PC Engine / TurboGrafx-16 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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#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/enable lines?
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#define FRAME_TIME 16667 // The time of one "frame" in µs (used for turbo functionality)
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#define UP 0x01
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#define DOWN 0x04
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#define LEFT 0x08
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#define RIGHT 0x02
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#define UP_SH 0
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#define DOWN_SH 2
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#define LEFT_SH 3
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#define RIGHT_SH 1
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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 = "PC Engine to USB";
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/* -------------------------------------------------------------------------
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PC Engine / TurboGrafx-16 controller wiring
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PC Engine (P1) Arduino Pro Micro
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--------------------------------------
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1 VCC VCC
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2 UP/I 3 PD0
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3 RIGHT/II 2 PD1
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4 DOWN/SELECT RXI PD2
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5 LEFT/START TXO PD3
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6 DSELECT 15 PB1 (Shared with P2)
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7 ENABLE 14 PB3 (Shared with P2)
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8 GND GND
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PC Engine (P2) Arduino Pro Micro
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--------------------------------------
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1 VCC VCC
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2 UP/I A3 PF4
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3 RIGHT/II A2 PF5
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4 DOWN/SELECT A1 PF6
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5 LEFT/START A0 PF7
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6 DSELECT 15 PB1 (Shared with P1)
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7 ENABLE 14 PB3 (Shared with P1)
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8 GND GND
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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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// Turbo timing
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uint32_t microsNow = 0;
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uint32_t microsEnable = 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 B1 and B3 as outputs and set them LOW
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PORTB &= ~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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// Handle clock for turbo functionality
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microsNow = micros();
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if((microsNow-microsEnable) >= FRAME_TIME)
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{
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PORTB |= B00001000; // Set enable pin HIGH to increase clock for turbo
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delayMicroseconds(SELECT_PAUSE); // Wait a while...
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PORTB &= ~B00001000; // Set enable pin LOW again
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microsEnable = microsNow;
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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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PORTB |= B00000010; // Set SELECT pin HIGH
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delayMicroseconds(SELECT_PAUSE); // Wait a while...
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buttons[0][0] = PIND & B00001111; // Read DPAD for controller 1
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if(GAMEPAD_COUNT==2)
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buttons[1][0] = (PINF & B11110000) >> 4; // Read DPAD for controller 2
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PORTB &= ~B00000010; // Set SELECT pin LOW
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delayMicroseconds(SELECT_PAUSE); // Wait a while...
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buttons[0][1] = PIND & B00001111; // Read buttons for controller 1
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if(GAMEPAD_COUNT==2)
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buttons[1][1] = (PINF & B11110000) >> 4; // Read buttons for controller 2
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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];
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Gamepad[gp]._GamepadReport.Y = ((buttons[gp][0] & DOWN) >> DOWN_SH) - ((buttons[gp][0] & UP) >> UP_SH);
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Gamepad[gp]._GamepadReport.X = ((buttons[gp][0] & RIGHT) >> RIGHT_SH) - ((buttons[gp][0] & LEFT) >> LEFT_SH);
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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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}} |