147 lines
6.2 KiB
C++
147 lines
6.2 KiB
C++
//
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// SegaController32U4.cpp
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//
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// Authors:
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// Jon Thysell <thysell@gmail.com>
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// Mikael Norrgård <mick@daemonbite.com>
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//
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// (Based on the code by Jon Thysell, but the interfacing is almost completely
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// rewritten by Mikael Norrgård)
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//
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// Copyright (c) 2017 Jon Thysell <http://jonthysell.com>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include "Arduino.h"
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#include "SegaController32U4.h"
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SegaController32U4::SegaController32U4(void)
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{
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// Setup select pin as output high (6, PD7)
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DDRD |= B10000000; // output
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PORTD |= B10000000; // high
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// Setup input pins (A0,A1,A2,A3,14,15 or PF7,PF6,PF5,PF4,PB3,PB1)
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DDRF &= ~B11110000; // input
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PORTF |= B11110000; // high to enable internal pull-up
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DDRB &= ~B00001010; // input
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PORTB |= B00001010; // high to enable internal pull-up
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_inputReg1 = 0;
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_inputReg2 = 0;
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_currentState = 0;
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_connected = 0;
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_sixButtonMode = false;
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_ignoreCycles = 0;
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_pinSelect = true;
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}
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word SegaController32U4::getStateMD()
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{
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// "Normal" Six button controller reading routine, done a bit differently in this project
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// Cycle TH out TR in TL in D3 in D2 in D1 in D0 in
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// 0 LO Start A 0 0 Down Up
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// 1 HI C B Right Left Down Up
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// 2 LO Start A 0 0 Down Up (Check connected and read Start and A in this cycle)
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// 3 HI C B Right Left Down Up (Read B, C and directions in this cycle)
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// 4 LO Start A 0 0 0 0 (Check for six button controller in this cycle)
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// 5 HI C B Mode X Y Z (Read X,Y,Z and Mode in this cycle)
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// 6 LO --- --- --- --- --- ---
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// 7 HI --- --- --- --- --- ---
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// Set the select pin low/high
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_pinSelect = !_pinSelect;
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(!_pinSelect) ? PORTD &= ~B10000000 : PORTD |= B10000000; // Set LOW on even cycle, HIGH on uneven cycle
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// Short delay to stabilise outputs in controller
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delayMicroseconds(SC_CYCLE_DELAY);
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// Read input register(s)
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_inputReg1 = PINF;
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_inputReg2 = PINB;
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if(_ignoreCycles <= 0)
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{
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if(_pinSelect) // Select pin is HIGH
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{
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if(_connected)
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{
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// Check if six button mode is active
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if(_sixButtonMode)
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{
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// Read input pins for X, Y, Z, Mode
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(bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) ? _currentState |= SC_BTN_Z : _currentState &= ~SC_BTN_Z;
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(bitRead(_inputReg1, DB9_PIN2_BIT) == LOW) ? _currentState |= SC_BTN_Y : _currentState &= ~SC_BTN_Y;
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(bitRead(_inputReg1, DB9_PIN3_BIT) == LOW) ? _currentState |= SC_BTN_X : _currentState &= ~SC_BTN_X;
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(bitRead(_inputReg1, DB9_PIN4_BIT) == LOW) ? _currentState |= SC_BTN_MODE : _currentState &= ~SC_BTN_MODE;
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_sixButtonMode = false;
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_ignoreCycles = 2; // Ignore the two next cycles (cycles 6 and 7 in table above)
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}
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else
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{
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// Read input pins for Up, Down, Left, Right, B, C
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(bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) ? _currentState |= SC_BTN_UP : _currentState &= ~SC_BTN_UP;
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(bitRead(_inputReg1, DB9_PIN2_BIT) == LOW) ? _currentState |= SC_BTN_DOWN : _currentState &= ~SC_BTN_DOWN;
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(bitRead(_inputReg1, DB9_PIN3_BIT) == LOW) ? _currentState |= SC_BTN_LEFT : _currentState &= ~SC_BTN_LEFT;
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(bitRead(_inputReg1, DB9_PIN4_BIT) == LOW) ? _currentState |= SC_BTN_RIGHT : _currentState &= ~SC_BTN_RIGHT;
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(bitRead(_inputReg2, DB9_PIN6_BIT) == LOW) ? _currentState |= SC_BTN_B : _currentState &= ~SC_BTN_B;
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(bitRead(_inputReg2, DB9_PIN9_BIT) == LOW) ? _currentState |= SC_BTN_C : _currentState &= ~SC_BTN_C;
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}
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}
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else // No Mega Drive controller is connected, use SMS/Atari mode
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{
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// Clear current state
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_currentState = 0;
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// Read input pins for Up, Down, Left, Right, Fire1, Fire2
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if (bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) { _currentState |= SC_BTN_UP; }
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if (bitRead(_inputReg1, DB9_PIN2_BIT) == LOW) { _currentState |= SC_BTN_DOWN; }
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if (bitRead(_inputReg1, DB9_PIN3_BIT) == LOW) { _currentState |= SC_BTN_LEFT; }
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if (bitRead(_inputReg1, DB9_PIN4_BIT) == LOW) { _currentState |= SC_BTN_RIGHT; }
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if (bitRead(_inputReg2, DB9_PIN6_BIT) == LOW) { _currentState |= SC_BTN_A; }
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if (bitRead(_inputReg2, DB9_PIN9_BIT) == LOW) { _currentState |= SC_BTN_B; }
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}
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}
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else // Select pin is LOW
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{
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// Check if a controller is connected
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_connected = (bitRead(_inputReg1, DB9_PIN3_BIT) == LOW && bitRead(_inputReg1, DB9_PIN4_BIT) == LOW);
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// Check for six button mode
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_sixButtonMode = (bitRead(_inputReg1, DB9_PIN1_BIT) == LOW && bitRead(_inputReg1, DB9_PIN2_BIT) == LOW);
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// Read input pins for A and Start
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if(_connected)
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{
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if(!_sixButtonMode)
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{
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(bitRead(_inputReg2, DB9_PIN6_BIT) == LOW) ? _currentState |= SC_BTN_A : _currentState &= ~SC_BTN_A;
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(bitRead(_inputReg2, DB9_PIN9_BIT) == LOW) ? _currentState |= SC_BTN_START : _currentState &= ~SC_BTN_START;
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}
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}
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}
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}
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else
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{
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_ignoreCycles--;
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}
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return _currentState;
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}
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