1 /* $Id: timer.h,v 1.4 2002-09-04 08:12:37 btb Exp $ */
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12 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
17 * Header for timer functions
20 * Revision 1.8 1994/12/10 12:27:23 john
21 * Added timer_get_approx_seconds.
23 * Revision 1.7 1994/12/10 12:10:25 john
26 * Revision 1.6 1994/12/10 12:07:06 john
27 * Added tick counter variable.
29 * Revision 1.5 1994/11/15 12:04:15 john
30 * Cleaned up timer code a bit... took out unused functions
31 * like timer_get_milliseconds, etc.
33 * Revision 1.4 1994/04/28 23:50:08 john
34 * Changed calling for init_timer. Made the function that the
35 * timer calls be a far function. All of this was done to make
36 * our timer system compatible with the HMI sound stuff.
38 * Revision 1.3 1994/02/17 15:57:12 john
39 * Changed key libary to C.
41 * Revision 1.2 1994/01/18 10:58:34 john
42 * Added timer_get_fixed_seconds
44 * Revision 1.1 1993/07/10 13:10:41 matt
56 //==========================================================================
57 // This installs the timer services and interrupts at the rate specified by
58 // count_val. If 'function' isn't 0, the function pointed to by function will
59 // be called 'freq' times per second. Should be > 19 and anything around
60 // 2-3000 is gonna start slowing down the system. Count_val should be
61 // 1,193,180 divided by your target frequency. Use 0 for the normal 18.2 Hz
64 #define TIMER_FREQUENCY 1193180
69 extern void timer_init();
70 extern void timer_close();
71 extern void timer_set_rate(int count_val);
72 extern void timer_set_function( void _far * function );
74 //==========================================================================
75 // These functions return the time since the timer was initialized in
76 // some various units. The total length of reading time varies for each
77 // one. They will roll around after they read 2^32.
78 // There are milliseconds, milliseconds times 10, milliseconds times 100,
79 // and microseconds. They time out after 1000 hrs, 100 hrs, 10 hrs, and
80 // 1 hr, respectively.
82 extern fix timer_get_fixed_seconds(); // Rolls about every 9 hours...
84 extern fix timer_get_fixed_secondsX(); // Assume interrupts already disabled
85 extern fix timer_get_approx_seconds(); // Returns time since program started... accurate to 1/120th of a second
86 extern void timer_set_joyhandler( void (*joy_handler)() );
88 #define timer_get_fixed_secondsX timer_get_fixed_seconds
89 #define timer_get_approx_seconds timer_get_fixed_seconds
92 //NOT_USED extern unsigned int timer_get_microseconds();
93 //NOT_USED extern unsigned int timer_get_milliseconds100();
94 //NOT_USED extern unsigned int timer_get_milliseconds10();
95 //NOT_USED extern unsigned int timer_get_milliseconds();
96 //NOT_USED extern unsigned int timer_get_millisecondsX(); // Assume interrupts disabled
98 void timer_delay(fix seconds);
100 //==========================================================================
101 // Use to access the BIOS ticker... ie... i = TICKER
103 #define TICKER (timer_get_fixed_seconds())
109 #define TICKER (*(volatile int *)0x46C)
112 #include <sys/farptr.h>
113 #define TICKER _farpeekl(_dos_ds, 0x46c)
115 #define USECS_PER_READING( start, stop, frames ) (((stop-start)*54945)/frames)
119 #define approx_usec_to_fsec(usec) ((usec) >> 4)
120 #define approx_fsec_to_usec(fsec) ((fsec) << 4)
121 #define approx_msec_to_fsec(msec) ((msec) << 6)
122 #define approx_fsec_to_msec(fsec) ((fsec) >> 6)