/* * multijoy.c - Multi Joy 8-player joystick adapter emulation. * * Written by * Marco van den Heuvel * * This file is part of VICE, the Versatile Commodore Emulator. * See README for copyright notice. * * 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 "vice.h" #include #include #include #include "joyport.h" #include "joystick.h" #include "multijoy.h" #include "resources.h" #include "snapshot.h" #include "log.h" /* 8 joysticks are wired in parallel with respect to their data lines. The ground of each joystick is hooked up to the output of a 74138 demultiplexer, and the other control port is used to deliver the address to be demultiplexed to the 74138: JOY PIN | 74138 INPUT --------------------- 1 | 1 (A0) 2 | 2 (A1) 3 | 3 (A2) 74138 OUTPUT | JOY GROUND ------------------------- 15 (O0) | JOY1 14 (O1) | JOY2 13 (O2) | JOY3 12 (O3) | JOY4 11 (O4) | JOY5 10 (O5) | JOY6 9 (O6) | JOY7 7 (O7) | JOY8 Note that the +5VDC is not connected to any of the 8 ports, but it is used to power the 74138. Works on: - native joystick ports (x64/x64sc/xscpu64/x128/xcbm5x0) */ static int multijoy_enabled = 0; static uint8_t multijoy_address = 0; /* ------------------------------------------------------------------------- */ static joyport_t joyport_multijoy_joy_device; static joyport_t joyport_multijoy_control_device; static int joyport_enable_in_progres = 0; static int joyport_multijoy_joysticks_set_enabled(int port, int enabled) { int new_state = enabled ? 1 : 0; int otherport = 0; if (new_state == multijoy_enabled) { return 0; } if (new_state) { /* enabled, activate joystick adapter, set amount of joystick adapter ports to 8 */ joystick_adapter_activate(JOYSTICK_ADAPTER_ID_MULTIJOY, joyport_multijoy_joy_device.name); /* enable 8 extra ports, no +5VDC support */ joystick_adapter_set_ports(8, 0); /* set other port to multijoy control device */ if (port == JOYPORT_1) { resources_set_int("JoyPort2Device", JOYPORT_ID_MULTIJOY_CONTROL); } else { resources_set_int("JoyPort1Device", JOYPORT_ID_MULTIJOY_CONTROL); } } else { /* disabled, disable joystick adapter and multijoy control port */ /* this function is called again upon setting the multijoy control port, ignore if this is part of the control enable/disable */ if (!joyport_enable_in_progres) { joyport_enable_in_progres = 1; /* disable multijoy control port */ if (port == JOYPORT_1) { resources_get_int("JoyPort2Device", &otherport); if (otherport == JOYPORT_ID_MULTIJOY_CONTROL) { resources_set_int("JoyPort2Device", JOYPORT_ID_NONE); } } else { resources_get_int("JoyPort1Device", &otherport); if (otherport == JOYPORT_ID_MULTIJOY_CONTROL) { resources_set_int("JoyPort1Device", JOYPORT_ID_NONE); } } } joystick_adapter_deactivate(); joyport_enable_in_progres = 0; } /* set current state */ multijoy_enabled = new_state; return 0; } static int joyport_multijoy_control_set_enabled(int port, int enabled) { int new_state = enabled ? 1 : 0; int otherport = 0; if (!new_state) { if (!joyport_enable_in_progres) { /* if the multijoy control port was disabled by the user, disable main multijoy port as well */ joyport_enable_in_progres = 1; if (port == JOYPORT_1) { resources_get_int("JoyPort2Device", &otherport); if (otherport == JOYPORT_ID_MULTIJOY_JOYSTICKS) { resources_set_int("JoyPort2Device", JOYPORT_ID_NONE); } } else { resources_get_int("JoyPort1Device", &otherport); if (otherport == JOYPORT_ID_MULTIJOY_JOYSTICKS) { resources_set_int("JoyPort1Device", JOYPORT_ID_NONE); } } } joyport_enable_in_progres = 0; } return 0; } static void multijoy_store(int port, uint8_t val) { multijoy_address = val & 7; } static uint8_t multijoy_read(int port) { uint8_t retval = 0; uint8_t joyval; joyval = ~read_joyport_dig(JOYPORT_3 + multijoy_address); retval = (uint8_t)(joyval & 0x1f); return ~(retval); } /* ------------------------------------------------------------------------- */ static int multijoy_write_snapshot(struct snapshot_s *s, int port); static int multijoy_read_snapshot(struct snapshot_s *s, int port); static joyport_t joyport_multijoy_joy_device = { "Joystick Adapter (MultiJoy Joysticks)", /* name of the device */ JOYPORT_RES_ID_NONE, /* device can be used in multiple ports at the same time */ JOYPORT_IS_NOT_LIGHTPEN, /* device is NOT a lightpen */ JOYPORT_POT_OPTIONAL, /* device does NOT use the potentiometer lines */ JOYPORT_5VDC_REQUIRED, /* device NEEDS +5VDC to work */ JOYSTICK_ADAPTER_ID_MULTIJOY, /* device is a joystick adapter */ JOYPORT_DEVICE_JOYSTICK_ADAPTER, /* device is a Joystick adapter */ 0, /* NO output bits */ joyport_multijoy_joysticks_set_enabled, /* device enable/disable function */ multijoy_read, /* digital line read function */ NULL, /* NO digital line store function */ NULL, /* NO pot-x read function */ NULL, /* NO pot-y read function */ NULL, /* NO powerup function */ multijoy_write_snapshot, /* device write snapshot function */ multijoy_read_snapshot, /* device read snapshot function */ NULL, /* NO device hook function */ 0 /* NO device hook function mask */ }; static joyport_t joyport_multijoy_control_device = { "Joystick Adapter (MultiJoy Logic)", /* name of the device */ JOYPORT_RES_ID_NONE, /* device can be used in multiple ports at the same time */ JOYPORT_IS_NOT_LIGHTPEN, /* device is NOT a lightpen */ JOYPORT_POT_OPTIONAL, /* device does NOT use the potentiometer lines */ JOYPORT_5VDC_REQUIRED, /* device NEEDS +5VDC to work */ JOYSTICK_ADAPTER_ID_NONE, /* device is NOT a joystick adapter */ JOYPORT_DEVICE_JOYSTICK_ADAPTER, /* device is a Joystick adapter */ 0x07, /* bits 2, 1 and 0 are output bits */ joyport_multijoy_control_set_enabled, /* device enable/disable function */ NULL, /* NO digital line read function */ multijoy_store, /* digital line store function */ NULL, /* NO pot-x read function */ NULL, /* NO pot-y read function */ NULL, /* NO powerup function */ NULL, /* NO device write snapshot function */ NULL, /* NO device read snapshot function */ NULL, /* NO device hook function */ 0 /* NO device hook function mask */ }; /* ------------------------------------------------------------------------- */ int joyport_multijoy_resources_init(void) { if (joyport_device_register(JOYPORT_ID_MULTIJOY_JOYSTICKS, &joyport_multijoy_joy_device) < 0) { return -1; } return joyport_device_register(JOYPORT_ID_MULTIJOY_CONTROL, &joyport_multijoy_control_device); } /* ------------------------------------------------------------------------- */ /* MULTIJOY snapshot module format: type | name | description ---------------------------------- BYTE | ADDRESS | which joystick is active */ static const char snap_module_name[] = "MULTIJOY"; #define SNAP_MAJOR 0 #define SNAP_MINOR 0 static int multijoy_write_snapshot(struct snapshot_s *s, int p) { snapshot_module_t *m; m = snapshot_module_create(s, snap_module_name, SNAP_MAJOR, SNAP_MINOR); if (m == NULL) { return -1; } if (0 || SMW_B(m, multijoy_address) < 0) { snapshot_module_close(m); return -1; } return snapshot_module_close(m); } static int multijoy_read_snapshot(struct snapshot_s *s, int p) { uint8_t major_version, minor_version; snapshot_module_t *m; m = snapshot_module_open(s, snap_module_name, &major_version, &minor_version); if (m == NULL) { return -1; } /* Do not accept versions higher than current */ if (snapshot_version_is_bigger(major_version, minor_version, SNAP_MAJOR, SNAP_MINOR)) { snapshot_set_error(SNAPSHOT_MODULE_HIGHER_VERSION); goto fail; } if (0 || SMR_B(m, &multijoy_address) < 0) { goto fail; } return snapshot_module_close(m); fail: snapshot_module_close(m); return -1; }