// // SegaController32U4.cpp // // Authors: // Jon Thysell // Mikael Norrgård // // (Based on the code by Jon Thysell, but the interfacing is almost completely // rewritten by Mikael Norrgård) // // Copyright (c) 2017 Jon Thysell // // 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; }