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//
// SegaController32U4.cpp
//
// Authors:
// Jon Thysell <thysell@gmail.com>
// Mikael Norrgård <mick@daemonbite.com>
//
// (Based on the code by Jon Thysell, but the interfacing is almost completely
// rewritten by Mikael Norrgård)
//
// Copyright (c) 2017 Jon Thysell <http://jonthysell.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "Arduino.h"
#include "SegaController32U4.h"
SegaController32U4::SegaController32U4(void)
{
// Setup select pin as output high (7, PE6)
DDR_SELECT |= MASK_SELECT; // output
PORT_SELECT |= MASK_SELECT; // high
// Setup input pins (A0,A1,A2,A3,14,15 or PF7,PF6,PF5,PF4,PB3,PB1)
DDRF &= ~B11110000; // input
PORTF |= B11110000; // high to enable internal pull-up
DDRB &= ~B00001010; // input
PORTB |= B00001010; // high to enable internal pull-up
_inputReg1 = 0;
_inputReg2 = 0;
_currentState = 0;
_connected = 0;
_sixButtonMode = false;
_ignoreCycles = 0;
_pinSelect = true;
}
word SegaController32U4::getStateMD()
{
// "Normal" Six button controller reading routine, done a bit differently in this project
// Cycle TH out TR in TL in D3 in D2 in D1 in D0 in
// 0 LO Start A 0 0 Down Up
// 1 HI C B Right Left Down Up
// 2 LO Start A 0 0 Down Up (Check connected and read Start and A in this cycle)
// 3 HI C B Right Left Down Up (Read B, C and directions in this cycle)
// 4 LO Start A 0 0 0 0 (Check for six button controller in this cycle)
// 5 HI C B Mode X Y Z (Read X,Y,Z and Mode in this cycle)
// 6 LO --- --- --- --- --- Home (Home only for 8bitdo wireless gamepads)
// 7 HI --- --- --- --- --- ---
// Set the select pin low/high
_pinSelect = !_pinSelect;
(!_pinSelect) ? PORT_SELECT &= ~MASK_SELECT : PORT_SELECT |= MASK_SELECT; // Set LOW on even cycle, HIGH on uneven cycle
// Short delay to stabilise outputs in controller
delayMicroseconds(SC_CYCLE_DELAY);
// Read input register(s)
_inputReg1 = PINF;
_inputReg2 = PINB;
if(_ignoreCycles <= 0)
{
if(_pinSelect) // Select pin is HIGH
{
if(_connected)
{
// Check if six button mode is active
if(_sixButtonMode)
{
// Read input pins for X, Y, Z, Mode
(bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) ? _currentState |= SC_BTN_Z : _currentState &= ~SC_BTN_Z;
(bitRead(_inputReg1, DB9_PIN2_BIT) == LOW) ? _currentState |= SC_BTN_Y : _currentState &= ~SC_BTN_Y;
(bitRead(_inputReg1, DB9_PIN3_BIT) == LOW) ? _currentState |= SC_BTN_X : _currentState &= ~SC_BTN_X;
(bitRead(_inputReg1, DB9_PIN4_BIT) == LOW) ? _currentState |= SC_BTN_MODE : _currentState &= ~SC_BTN_MODE;
_sixButtonMode = false;
_ignoreCycles = 2; // Ignore the two next cycles (cycles 6 and 7 in table above)
}
else
{
// Read input pins for Up, Down, Left, Right, B, C
(bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) ? _currentState |= SC_BTN_UP : _currentState &= ~SC_BTN_UP;
(bitRead(_inputReg1, DB9_PIN2_BIT) == LOW) ? _currentState |= SC_BTN_DOWN : _currentState &= ~SC_BTN_DOWN;
(bitRead(_inputReg1, DB9_PIN3_BIT) == LOW) ? _currentState |= SC_BTN_LEFT : _currentState &= ~SC_BTN_LEFT;
(bitRead(_inputReg1, DB9_PIN4_BIT) == LOW) ? _currentState |= SC_BTN_RIGHT : _currentState &= ~SC_BTN_RIGHT;
(bitRead(_inputReg2, DB9_PIN6_BIT) == LOW) ? _currentState |= SC_BTN_B : _currentState &= ~SC_BTN_B;
(bitRead(_inputReg2, DB9_PIN9_BIT) == LOW) ? _currentState |= SC_BTN_C : _currentState &= ~SC_BTN_C;
}
}
else // No Mega Drive controller is connected, use SMS/Atari mode
{
// Clear current state
_currentState = 0;
// Read input pins for Up, Down, Left, Right, Fire1, Fire2
if (bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) { _currentState |= SC_BTN_UP; }
if (bitRead(_inputReg1, DB9_PIN2_BIT) == LOW) { _currentState |= SC_BTN_DOWN; }
if (bitRead(_inputReg1, DB9_PIN3_BIT) == LOW) { _currentState |= SC_BTN_LEFT; }
if (bitRead(_inputReg1, DB9_PIN4_BIT) == LOW) { _currentState |= SC_BTN_RIGHT; }
if (bitRead(_inputReg2, DB9_PIN6_BIT) == LOW) { _currentState |= SC_BTN_A; }
if (bitRead(_inputReg2, DB9_PIN9_BIT) == LOW) { _currentState |= SC_BTN_B; }
}
}
else // Select pin is LOW
{
// Check if a controller is connected
_connected = (bitRead(_inputReg1, DB9_PIN3_BIT) == LOW && bitRead(_inputReg1, DB9_PIN4_BIT) == LOW);
// Check for six button mode
_sixButtonMode = (bitRead(_inputReg1, DB9_PIN1_BIT) == LOW && bitRead(_inputReg1, DB9_PIN2_BIT) == LOW);
// Read input pins for A and Start
if(_connected)
{
if(!_sixButtonMode)
{
(bitRead(_inputReg2, DB9_PIN6_BIT) == LOW) ? _currentState |= SC_BTN_A : _currentState &= ~SC_BTN_A;
(bitRead(_inputReg2, DB9_PIN9_BIT) == LOW) ? _currentState |= SC_BTN_START : _currentState &= ~SC_BTN_START;
}
}
}
}
else
{
if(_ignoreCycles-- == 2) // Decrease the ignore cycles counter and read 8bitdo home in first "ignored" cycle, this cycle is unused on normal 6-button controllers
{
(bitRead(_inputReg1, DB9_PIN1_BIT) == LOW) ? _currentState |= SC_BTN_HOME : _currentState &= ~SC_BTN_HOME;
}
}
return _currentState;
}