2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
3 SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
14 * $Source: /cvs/cvsroot/d2x/include/timer.h,v $
17 * $Date: 2001-10-12 10:03:32 $
19 * Header for timer functions
21 * $Log: not supported by cvs2svn $
22 * Revision 1.1.1.2 2001/01/19 03:34:09 bradleyb
23 * Import of d2x-0.0.9-pre1
25 * Revision 1.1.1.1 1999/06/14 22:02:21 donut
26 * Import of d1x 1.37 source.
28 * Revision 1.8 1994/12/10 12:27:23 john
29 * Added timer_get_approx_seconds.
31 * Revision 1.7 1994/12/10 12:10:25 john
37 * Revision 1.6 1994/12/10 12:07:06 john
38 * Added tick counter variable.
40 * Revision 1.5 1994/11/15 12:04:15 john
41 * Cleaned up timer code a bit... took out unused functions
42 * like timer_get_milliseconds, etc.
44 * Revision 1.4 1994/04/28 23:50:08 john
45 * Changed calling for init_timer. Made the function that the
46 * timer calls be a far function. All of this was done to make
47 * our timer system compatible with the HMI sound stuff.
49 * Revision 1.3 1994/02/17 15:57:12 john
50 * Changed key libary to C.
52 * Revision 1.2 1994/01/18 10:58:34 john
53 * Added timer_get_fixed_seconds
55 * Revision 1.1 1993/07/10 13:10:41 matt
68 //==========================================================================
69 // This installs the timer services and interrupts at the rate specified by
70 // count_val. If 'function' isn't 0, the function pointed to by function will
71 // be called 'freq' times per second. Should be > 19 and anything around
72 // 2-3000 is gonna start slowing down the system. Count_val should be
73 // 1,193,180 divided by your target frequency. Use 0 for the normal 18.2 Hz
76 #define TIMER_FREQUENCY 1193180
81 extern void timer_init();
82 extern void timer_close();
83 extern void timer_set_rate(int count_val);
84 extern void timer_set_function( void _far * function );
86 //==========================================================================
87 // These functions return the time since the timer was initialized in
88 // some various units. The total length of reading time varies for each
89 // one. They will roll around after they read 2^32.
90 // There are milliseconds, milliseconds times 10, milliseconds times 100,
91 // and microseconds. They time out after 1000 hrs, 100 hrs, 10 hrs, and
92 // 1 hr, respectively.
94 extern fix timer_get_fixed_seconds(); // Rolls about every 9 hours...
96 extern fix timer_get_fixed_secondsX(); // Assume interrupts already disabled
97 extern fix timer_get_approx_seconds(); // Returns time since program started... accurate to 1/120th of a second
98 extern void timer_set_joyhandler( void (*joy_handler)() );
100 #define timer_get_fixed_secondsX timer_get_fixed_seconds
101 #define timer_get_approx_seconds timer_get_fixed_seconds
104 //NOT_USED extern unsigned int timer_get_microseconds();
105 //NOT_USED extern unsigned int timer_get_milliseconds100();
106 //NOT_USED extern unsigned int timer_get_milliseconds10();
107 //NOT_USED extern unsigned int timer_get_milliseconds();
108 //NOT_USED extern unsigned int timer_get_millisecondsX(); // Assume interrupts disabled
110 //==========================================================================
111 // Use to access the BIOS ticker... ie... i = TICKER
113 #define TICKER (timer_get_fixed_seconds())
119 #define TICKER (*(volatile int *)0x46C)
122 #include <sys/farptr.h>
123 #define TICKER _farpeekl(_dos_ds, 0x46c)
125 #define USECS_PER_READING( start, stop, frames ) (((stop-start)*54945)/frames)