Genesis-Plus-GX/source/io_ctrl.c
ekeeke31 ab4638144c [Core/VDP]
---------------
* added support for Master System compatibility mode (Z80 ports access mode), incl. Mode 5 rendering.
* added Mode 4 rendering for both Genesis & Master System modes.
* added alternate BG planes rendering functions (should be faster on PPC architectures).

[Core/IO]
---------------
* added support for Master System compatibility mode (Z80 ports access mode).
* added Master System peripherals emulation (Control Pad, Paddle, Sports Pad & Light Phaser).
* added XE-1AP (analog controller) emulation.
* added Activator emulation.

[Core/Extra]
---------------
* added support for all known Master System cartridge mappers.
* added copy-protection hardware emulation for a few MD unlicensed games: fixes 777 Casino (crash when talking to bunny girls).
(NB: most of those unlicensed games seem to have been already patched by ROM dumpers, main purpose is documenting them)
* added support for Top Shooter arcade board controller. (A=Shoot, B=Bet, C/RIGHT=Coins, START=Start, hold UP on startup to enter service mode)
* improved King of Fighters 98 mapper emulation (registers address decoding is now 100% accurate)
* fixed Game Genie when several codes affect same ROM address.
* fixed EEPROM types for Brian Lara Cricket & NBA Jam TE (verified on real cartridges)

[Core/General]
---------------
* added Master System compatibility mode emulation (automatically enabled when loading ROM file with .sms extension).
* improved savestate stability & compatibility (support for old 1.4.x savestates is preserved)
* various code cleanup & comments.

[Gamecube/Wii]
---------------
* fixed cheat codes handling when several codes affect same ROM address.
* improved input controller detection on menu exit.
* improved key remapping dialog box to match emulated device
* changed Menu key for Gamecube controller to allow MODE button mapping
* fixed DVD not being unmounted on swap (memory leak)

[Wii only]
---------------
* added USB mouse support for Sega Mouse emulation
* compiled with latest libogc: improves USB compatibility & fixes stability issues with Wiimotes.
2011-03-31 22:11:05 +00:00

451 lines
10 KiB
C

/***************************************************************************************
* Genesis Plus
* I/O controller (MD & MS compatibility modes)
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
* Eke-Eke (2007-2011), additional code & fixes for the GCN/Wii port
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
****************************************************************************************/
#include "shared.h"
#include "gamepad.h"
#include "lightgun.h"
#include "mouse.h"
#include "activator.h"
#include "xe_a1p.h"
#include "teamplayer.h"
#include "paddle.h"
#include "sportspad.h"
uint8 io_reg[0x10];
uint8 region_code = REGION_USA;
static struct port_t
{
void (*data_w)(unsigned char data, unsigned char mask);
unsigned char (*data_r)(void);
} port[3];
static void dummy_write(unsigned char data, unsigned char mask)
{
}
static unsigned char dummy_read(void)
{
return 0x7F;
}
/*****************************************************************************
* I/O chip functions *
* *
*****************************************************************************/
void io_init(void)
{
/* Initialize connected peripherals */
input_init();
/* Initialize IO Ports handlers & connected peripherals */
switch (input.system[0])
{
case SYSTEM_MS_GAMEPAD:
{
port[0].data_w = dummy_write;
port[0].data_r = gamepad_1_read;
break;
}
case SYSTEM_MD_GAMEPAD:
{
port[0].data_w = gamepad_1_write;
port[0].data_r = gamepad_1_read;
break;
}
case SYSTEM_MOUSE:
{
port[0].data_w = mouse_write;
port[0].data_r = mouse_read;
break;
}
case SYSTEM_ACTIVATOR:
{
port[0].data_w = activator_1_write;
port[0].data_r = activator_1_read;
break;
}
case SYSTEM_XE_A1P:
{
port[0].data_w = xe_a1p_write;
port[0].data_r = xe_a1p_read;
break;
}
case SYSTEM_WAYPLAY:
{
port[0].data_w = wayplay_1_write;
port[0].data_r = wayplay_1_read;
break;
}
case SYSTEM_TEAMPLAYER:
{
port[0].data_w = teamplayer_1_write;
port[0].data_r = teamplayer_1_read;
break;
}
case SYSTEM_LIGHTPHASER:
{
port[0].data_w = dummy_write;
port[0].data_r = phaser_1_read;
break;
}
case SYSTEM_PADDLE:
{
port[0].data_w = paddle_1_write;
port[0].data_r = paddle_1_read;
break;
}
case SYSTEM_SPORTSPAD:
{
port[0].data_w = sportspad_1_write;
port[0].data_r = sportspad_1_read;
break;
}
default:
{
port[0].data_w = dummy_write;
port[0].data_r = dummy_read;
break;
}
}
switch (input.system[1])
{
case SYSTEM_MS_GAMEPAD:
{
port[1].data_w = dummy_write;
port[1].data_r = gamepad_2_read;
break;
}
case SYSTEM_MD_GAMEPAD:
{
port[1].data_w = gamepad_2_write;
port[1].data_r = gamepad_2_read;
break;
}
case SYSTEM_MOUSE:
{
port[1].data_w = mouse_write;
port[1].data_r = mouse_read;
break;
}
case SYSTEM_ACTIVATOR:
{
port[1].data_w = activator_2_write;
port[1].data_r = activator_2_read;
break;
}
case SYSTEM_MENACER:
{
port[1].data_w = dummy_write;
port[1].data_r = menacer_read;
break;
}
case SYSTEM_JUSTIFIER:
{
port[1].data_w = justifier_write;
port[1].data_r = justifier_read;
break;
}
case SYSTEM_WAYPLAY:
{
port[1].data_w = wayplay_2_write;
port[1].data_r = wayplay_2_read;
break;
}
case SYSTEM_TEAMPLAYER:
{
port[1].data_w = teamplayer_2_write;
port[1].data_r = teamplayer_2_read;
break;
}
case SYSTEM_LIGHTPHASER:
{
port[1].data_w = dummy_write;
port[1].data_r = phaser_2_read;
break;
}
case SYSTEM_PADDLE:
{
port[1].data_w = paddle_2_write;
port[1].data_r = paddle_2_read;
break;
}
case SYSTEM_SPORTSPAD:
{
port[1].data_w = sportspad_2_write;
port[1].data_r = sportspad_2_read;
break;
}
default:
{
port[1].data_w = dummy_write;
port[1].data_r = dummy_read;
break;
}
}
/* External Port (unconnected) */
port[2].data_w = dummy_write;
port[2].data_r = dummy_read;
}
void io_reset(void)
{
/* Reset I/O registers */
if (system_hw == SYSTEM_PBC)
{
/* SMS compatibility mode control register */
io_reg[0x00] = 0xFF;
}
else
{
/* Genesis mode registers */
io_reg[0x00] = region_code | 0x20 | (config.tmss & 1);
io_reg[0x01] = 0x00;
io_reg[0x02] = 0x00;
io_reg[0x03] = 0x00;
io_reg[0x04] = 0x00;
io_reg[0x05] = 0x00;
io_reg[0x06] = 0x00;
io_reg[0x07] = 0xFF;
io_reg[0x08] = 0x00;
io_reg[0x09] = 0x00;
io_reg[0x0A] = 0xFF;
io_reg[0x0B] = 0x00;
io_reg[0x0C] = 0x00;
io_reg[0x0D] = 0xFB;
io_reg[0x0E] = 0x00;
io_reg[0x0F] = 0x00;
}
/* Reset connected peripherals */
input_reset();
}
void io_68k_write(unsigned int offset, unsigned int data)
{
switch (offset)
{
case 0x01: /* Port A Data */
case 0x02: /* Port B Data */
case 0x03: /* Port C Data */
{
io_reg[offset] = data;
port[offset-1].data_w(data, io_reg[offset + 3]);
return;
}
case 0x04: /* Port A Ctrl */
case 0x05: /* Port B Ctrl */
case 0x06: /* Port C Ctrl */
{
if (data != io_reg[offset])
{
io_reg[offset] = data;
port[offset-4].data_w(io_reg[offset-3], data);
}
return;
}
case 0x07: /* Port A TxData */
case 0x0A: /* Port B TxData */
case 0x0D: /* Port C TxData */
{
io_reg[offset] = data;
return;
}
case 0x09: /* Port A S-Ctrl */
case 0x0C: /* Port B S-Ctrl */
case 0x0F: /* Port C S-Ctrl */
{
io_reg[offset] = data & 0xF8;
return;
}
default: /* Read-only ports */
{
return;
}
}
}
unsigned int io_68k_read(unsigned int offset)
{
switch(offset)
{
case 0x01: /* Port A Data */
case 0x02: /* Port B Data */
case 0x03: /* Port C Data */
{
unsigned int mask = 0x80 | io_reg[offset + 3];
unsigned int data = port[offset-1].data_r();
return (io_reg[offset] & mask) | (data & ~mask);
}
default: /* return register value */
{
return io_reg[offset];
}
}
}
void io_z80_write(unsigned int data)
{
/* pins can't be configured as output on japanese models */
if (region_code & REGION_USA)
{
/*
Bit Function
--------------
D7 : Port B TH pin output level (1=high, 0=low)
D6 : Port B TR pin output level (1=high, 0=low)
D5 : Port A TH pin output level (1=high, 0=low)
D4 : Port A TR pin output level (1=high, 0=low)
D3 : Port B TH pin direction (1=input, 0=output)
D2 : Port B TR pin direction (1=input, 0=output)
D1 : Port A TH pin direction (1=input, 0=output)
D0 : Port A TR pin direction (1=input, 0=output)
*/
/* Send TR/TH state to connected peripherals */
port[0].data_w((data << 1) & 0x60, (~io_reg[0] << 5) & 0x60);
port[1].data_w((data >> 1) & 0x60, (~io_reg[0] << 3) & 0x60);
/* Check for TH low-to-high transitions on both ports */
if ((!(io_reg[0] & 0x80) && (data & 0x80)) ||
(!(io_reg[0] & 0x20) && (data & 0x20)))
{
/* Latch new HVC */
hvc_latch = hctab[(mcycles_z80 + Z80_CYCLE_OFFSET) % MCYCLES_PER_LINE] | 0x10000;
}
}
else
{
/* outputs return fixed value */
data &= 0x0F;
}
/* Update control register */
io_reg[0] = data;
}
unsigned int io_z80_read(unsigned int offset)
{
/* Read port A & port B input data */
unsigned int data = (port[0].data_r()) | (port[1].data_r() << 8);
/* Read control register value */
unsigned int ctrl = io_reg[0];
/* I/O ports */
if (offset)
{
/*
Bit Function
--------------
D7 : Port B TH pin input
D6 : Port A TH pin input
D5 : Unused (0 on Mega Drive, 1 otherwise)
D4 : RESET button (always 1 on Mega Drive)
D3 : Port B TR pin input
D2 : Port B TL pin input
D1 : Port B Right pin input
D0 : Port B Left pin input
*/
data = ((data >> 10) & 0x0F) | (data & 0x40) | ((data >> 7) & 0x80) | 0x10;
/* Adjust port B TH state if configured as output */
if (!(ctrl & 0x08))
{
data &= ~0x80;
data |= (ctrl & 0x80);
}
/* Adjust port A TH state if configured as output */
if (!(ctrl & 0x02))
{
data &= ~0x40;
data |= ((ctrl & 0x20) << 1);
}
/* Adjust port B TR state if configured as output */
if (!(ctrl & 0x04))
{
data &= ~0x08;
data |= ((ctrl & 0x40) >> 3);
}
}
else
{
/*
Bit Function
--------------
D7 : Port B Down pin input
D6 : Port B Up pin input
D5 : Port A TR pin input
D4 : Port A TL pin input
D3 : Port A Right pin input
D2 : Port A Left pin input
D1 : Port A Down pin input
D0 : Port A Up pin input
*/
data = (data & 0x3F) | ((data >> 2) & 0xC0);
/* Adjust port A TR state if configured as output */
if (!(ctrl & 0x01))
{
data &= ~0x20;
data |= ((ctrl & 0x10) << 1);
}
}
return data;
}