mirror of
https://github.com/mauiaaron/apple2.git
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208 lines
6.1 KiB
C
208 lines
6.1 KiB
C
/*
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* Apple // emulator for Linux: Joystick calibration routines
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*
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* Copyright 1994 Alexander Jean-Claude Bottema
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* Copyright 1995 Stephen Lee
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* Copyright 1997, 1998 Aaron Culliney
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* Copyright 1998, 1999, 2000 Michael Deutschmann
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*
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* This software package is subject to the GNU General Public License
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* version 2 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* THERE ARE NO WARRANTIES WHATSOEVER.
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*
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*/
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#include <linux/joystick.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <values.h>
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#include "interface.h"
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#include "video.h"
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#include "keys.h"
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#include "misc.h"
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#include "prefs.h"
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int js_fd = -1; /* joystick file descriptor */
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struct JS_DATA_TYPE js; /* joystick data struct */
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int js_lowerrange_x,
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js_upperrange_x,
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js_lowerrange_y,
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js_upperrange_y,
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js_offset_x,
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js_offset_y;
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float
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js_adjustlow_x,
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js_adjustlow_y,
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js_adjusthigh_x,
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js_adjusthigh_y;
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/* -------------------------------------------------------------------------
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c_open_joystick() - opens joystick device and sets timelimit value
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------------------------------------------------------------------------- */
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int c_open_joystick() {
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if (js_fd < 0) {
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if ((js_fd = open("/dev/js0", O_RDONLY)) < 0) {
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/* try again with another name */
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if ((js_fd = open("/dev/joystick", O_RDONLY)) < 0)
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return 1;/* problem */
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}
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/* set timelimit value */
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if (ioctl(js_fd, JS_SET_TIMELIMIT, &js_timelimit) == -1)
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return 1;/* problem */
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}
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return 0;/* no problem */
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}
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/* -------------------------------------------------------------------------
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c_close_joystick() - closes joystick device
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------------------------------------------------------------------------- */
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void c_close_joystick() {
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if (js_fd < 0)
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return;
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close(js_fd);
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js_fd = -1;
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}
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/* -------------------------------------------------------------------------
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* c_calculate_joystick_parms() - calculates parameters for joystick
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* device. assumes that device extremes have already been determined.
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* ------------------------------------------------------------------------- */
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void c_calculate_joystick_parms() {
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js_lowerrange_x = js_center_x - js_min_x;
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js_upperrange_x = js_max_x - js_center_x;
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js_lowerrange_y = js_center_y - js_min_y;
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js_upperrange_y = js_max_y - js_center_y;
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js_offset_x = js_min_x;
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js_offset_y = js_min_y;
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js_adjustlow_x = (float)half_joy_range / (float)js_lowerrange_x;
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js_adjustlow_y = (float)half_joy_range / (float)js_lowerrange_y;
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js_adjusthigh_x = (float)half_joy_range / (float)js_upperrange_x;
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js_adjusthigh_y = (float)half_joy_range / (float)js_upperrange_y;
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}
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/* -------------------------------------------------------------------------
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c_calibrate_joystick() - calibrates joystick. determines extreme
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and center coordinates. assumes that it can write to the interface
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screen.
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------------------------------------------------------------------------- */
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void c_calibrate_joystick () {
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int almost_done, done;
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unsigned char x_val, y_val;
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/* reset all the extremes */
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js_max_x = -1;
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js_max_y = -1;
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js_min_x = MAXINT;
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js_min_y = MAXINT;
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/* open joystick device if not open */
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if (js_fd < 0) {
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if (c_open_joystick()) { /* problem opening device */
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c_interface_print(
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1, 21, 0, " " );
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c_interface_print(
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1, 22, 0, " cannot open joystick device. " );
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video_sync(0);
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usleep(1500000);
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c_interface_redo_bottom();
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return;/* problem */
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}
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}
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c_interface_print(
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1, 21, 0, " Move joystick to all extremes then " );
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c_interface_print(
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1, 22, 0, " center it and press a button. " );
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video_sync(0);
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usleep(1500000);
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c_interface_print(
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1, 21, 0, " " );
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c_interface_print(
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1, 22, 0, " " );
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almost_done = done = 0; /* not done calibrating */
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while ((read(js_fd, &js, JS_RETURN) > 0) && (!done))
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{
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sprintf (temp, " x = %04x, y = %04x", js.x, js.y);
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c_interface_print(1, 22, 0, temp);
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video_sync(0);
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if (js_max_x < js.x)
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js_max_x = js.x;
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if (js_max_y < js.y)
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js_max_y = js.y;
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if (js_min_x > js.x)
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js_min_x = js.x;
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if (js_min_y > js.y)
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js_min_y = js.y;
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if (js.buttons != 0x00) /* press */
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almost_done = 1;
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if (almost_done && (js.buttons == 0x00)) /* release */
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done = 1;
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}
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js_center_x = js.x;
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js_center_y = js.y;
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printf("js_min_x = %d\n", js_min_x);
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printf("js_min_y = %d\n", js_min_y);
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printf("js_max_x = %d\n", js_max_x);
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printf("js_max_y = %d\n", js_max_y);
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printf("js_center_x = %d\n", js_center_x);
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printf("js_center_y = %d\n", js_center_y);
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printf("\n");
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c_calculate_joystick_parms(); /* determine the parms */
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printf("js_lowerrange_x = %d\n", js_lowerrange_x);
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printf("js_lowerrange_y = %d\n", js_lowerrange_y);
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printf("js_upperrange_x = %d\n", js_upperrange_x);
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printf("js_upperrange_y = %d\n", js_upperrange_y);
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printf("\n");
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printf("js_offset_x = %d\n", js_offset_x);
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printf("js_offset_y = %d\n", js_offset_y);
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printf("\n");
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printf("js_adjustlow_x = %f\n", js_adjustlow_x);
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printf("js_adjustlow_y = %f\n", js_adjustlow_y);
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printf("js_adjusthigh_x = %f\n", js_adjusthigh_x);
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printf("js_adjusthigh_y = %f\n", js_adjusthigh_y);
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printf("\n");
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c_interface_print(
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1, 21, 0, " Press a button to continue. " );
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video_sync(0);
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/* show the normalized values until user presses button */
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while ((read(js_fd, &js, JS_RETURN) > 0) && js.buttons == 0x00) {
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x_val = (js.x < js_center_x)
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? (js.x - js_offset_x) * js_adjustlow_x
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: (js.x - (js_center_x/*+js_offset_x*/)) * js_adjusthigh_x +
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half_joy_range;
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y_val = (js.y < js_center_y)
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? (js.y - js_offset_y) * js_adjustlow_y
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: (js.y - (js_center_y/*+js_offset_y*/)) * js_adjusthigh_y +
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half_joy_range;
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sprintf(temp, " x = %02x, y = %02x", x_val, y_val);
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c_interface_print(1, 22, 0, temp);
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video_sync(0);
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}
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c_interface_redo_bottom();
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video_sync(0);
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}
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