282 lines
8.1 KiB
C
282 lines
8.1 KiB
C
/*
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* VARCem Virtual ARchaeological Computer EMulator.
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* An emulator of (mostly) x86-based PC systems and devices,
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* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
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* spanning the era between 1981 and 1995.
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*
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* This file is part of the VARCem Project.
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*
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* Implementation of a Side Winder GamePad.
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*
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* Notes: - Write to 0x201 starts packet transfer (5*N or 15*N bits)
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* - Currently alternates between Mode A and Mode B (is there
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* any way of actually controlling which is used?)
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* - Windows 9x drivers require Mode B when more than 1 pad
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* connected
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* - Packet preceeded by high data (currently 50us), and
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* followed by low data (currently 160us) - timings are
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* probably wrong, but good enough for everything I've tried
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* - Analog inputs are only used to time ID packet request.
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* If A0 timing out is followed after ~64us by another 0x201
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* write then an ID packet is triggered
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* - Sidewinder game pad ID is 'H0003'
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* - ID is sent in Mode A (1 bit per clock), but data bit 2
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* must change during ID packet transfer, or Windows 9x
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* drivers won't use Mode B. I don't know if it oscillates,
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* mirrors the data transfer, or something else - the drivers
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* only check that it changes at least 10 times during the
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* transfer
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* - Some DOS stuff will write to 0x201 while a packet is
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* being transferred. This seems to be ignored.
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*
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*
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*
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* Authors: Miran Grca, <mgrca8@gmail.com>
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* Sarah Walker, <tommowalker@tommowalker.co.uk>
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*
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* Copyright 2016-2018 Miran Grca.
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* Copyright 2008-2018 Sarah Walker.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the:
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*
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* Free Software Foundation, Inc.
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* 59 Temple Place - Suite 330
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* Boston, MA 02111-1307
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* USA.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/device.h>
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#include <86box/timer.h>
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#include <86box/gameport.h>
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#include <86box/joystick_sw_pad.h>
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typedef struct
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{
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pc_timer_t poll_timer;
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int poll_left;
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int poll_clock;
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uint64_t poll_data;
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int poll_mode;
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pc_timer_t trigger_timer;
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int data_mode;
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} sw_data;
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static void sw_timer_over(void *p)
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{
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sw_data *sw = (sw_data *)p;
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sw->poll_clock = !sw->poll_clock;
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if (sw->poll_clock)
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{
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sw->poll_data >>= (sw->poll_mode ? 3 : 1);
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sw->poll_left--;
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}
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if (sw->poll_left == 1 && !sw->poll_clock)
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timer_advance_u64(&sw->poll_timer, TIMER_USEC * 160);
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else if (sw->poll_left)
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timer_advance_u64(&sw->poll_timer, TIMER_USEC * 5);
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else
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timer_disable(&sw->poll_timer);
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}
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static void sw_trigger_timer_over(void *p)
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{
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sw_data *sw = (sw_data *)p;
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timer_disable(&sw->trigger_timer);
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}
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static int sw_parity(uint16_t data)
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{
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int bits_set = 0;
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while (data)
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{
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bits_set++;
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data &= (data - 1);
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}
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return bits_set & 1;
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}
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static void *sw_init(void)
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{
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sw_data *sw = (sw_data *)malloc(sizeof(sw_data));
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memset(sw, 0, sizeof(sw_data));
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timer_add(&sw->poll_timer, sw_timer_over, sw, 0);
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timer_add(&sw->trigger_timer, sw_trigger_timer_over, sw, 0);
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return sw;
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}
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static void sw_close(void *p)
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{
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sw_data *sw = (sw_data *)p;
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free(sw);
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}
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static uint8_t sw_read(void *p)
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{
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sw_data *sw = (sw_data *)p;
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uint8_t temp = 0;
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if (!JOYSTICK_PRESENT(0))
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return 0xff;
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if (timer_is_enabled(&sw->poll_timer))
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{
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if (sw->poll_clock)
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temp |= 0x10;
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if (sw->poll_mode)
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temp |= (sw->poll_data & 7) << 5;
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else
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{
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temp |= ((sw->poll_data & 1) << 5) | 0xc0;
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if (sw->poll_left > 31 && !(sw->poll_left & 1))
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temp &= ~0x80;
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}
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}
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else
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temp |= 0xf0;
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return temp;
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}
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static void sw_write(void *p)
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{
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sw_data *sw = (sw_data *)p;
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int64_t time_since_last = timer_get_remaining_us(&sw->trigger_timer);
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if (!JOYSTICK_PRESENT(0))
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return;
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timer_process();
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if (!sw->poll_left)
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{
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sw->poll_clock = 1;
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timer_set_delay_u64(&sw->poll_timer, TIMER_USEC * 50);
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if (time_since_last > 9900 && time_since_last < 9940)
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{
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sw->poll_mode = 0;
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sw->poll_left = 49;
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sw->poll_data = 0x2400ull | (0x1830ull << 15) | (0x19b0ull << 30);
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}
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else
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{
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int c;
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sw->poll_mode = sw->data_mode;
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sw->data_mode = !sw->data_mode;
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if (sw->poll_mode)
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{
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sw->poll_left = 1;
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sw->poll_data = 7;
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}
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else
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{
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sw->poll_left = 1;
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sw->poll_data = 1;
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}
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for (c = 0; c < 4; c++)
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{
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uint16_t data = 0x3fff;
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int b;
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if (!JOYSTICK_PRESENT(c))
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break;
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if (joystick_state[c].axis[1] < -16383)
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data &= ~1;
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if (joystick_state[c].axis[1] > 16383)
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data &= ~2;
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if (joystick_state[c].axis[0] > 16383)
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data &= ~4;
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if (joystick_state[c].axis[0] < -16383)
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data &= ~8;
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for (b = 0; b < 10; b++)
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{
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if (joystick_state[c].button[b])
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data &= ~(1 << (b + 4));
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}
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if (sw_parity(data))
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data |= 0x4000;
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if (sw->poll_mode)
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{
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sw->poll_left += 5;
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sw->poll_data |= (data << (c*15 + 3));
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}
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else
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{
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sw->poll_left += 15;
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sw->poll_data |= (data << (c*15 + 1));
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}
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}
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}
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}
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timer_disable(&sw->trigger_timer);
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}
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static int sw_read_axis(void *p, int axis)
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{
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if (!JOYSTICK_PRESENT(0))
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return AXIS_NOT_PRESENT;
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return 0; /*No analogue support on Sidewinder game pad*/
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}
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static void sw_a0_over(void *p)
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{
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sw_data *sw = (sw_data *)p;
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timer_set_delay_u64(&sw->trigger_timer, TIMER_USEC * 10000);
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}
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const joystick_if_t joystick_sw_pad =
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{
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"Microsoft SideWinder Pad",
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"sidewinder_pad",
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sw_init,
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sw_close,
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sw_read,
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sw_write,
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sw_read_axis,
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sw_a0_over,
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2,
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10,
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0,
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4,
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{"X axis", "Y axis"},
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{"A", "B", "C", "X", "Y", "Z", "L", "R", "Start", "M"}
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};
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