1 /* $Id: timer.h,v 1.6 2004-08-28 23:17:45 schaffner Exp $ */
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12 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
17 * Header for timer functions
28 //==========================================================================
29 // This installs the timer services and interrupts at the rate specified by
30 // count_val. If 'function' isn't 0, the function pointed to by function will
31 // be called 'freq' times per second. Should be > 19 and anything around
32 // 2-3000 is gonna start slowing down the system. Count_val should be
33 // 1,193,180 divided by your target frequency. Use 0 for the normal 18.2 Hz
36 #define TIMER_FREQUENCY 1193180
41 extern void timer_init();
42 extern void timer_close();
43 extern void timer_set_rate(int count_val);
44 extern void timer_set_function( void _far * function );
46 //==========================================================================
47 // These functions return the time since the timer was initialized in
48 // some various units. The total length of reading time varies for each
49 // one. They will roll around after they read 2^32.
50 // There are milliseconds, milliseconds times 10, milliseconds times 100,
51 // and microseconds. They time out after 1000 hrs, 100 hrs, 10 hrs, and
52 // 1 hr, respectively.
54 extern fix timer_get_fixed_seconds(); // Rolls about every 9 hours...
56 extern fix timer_get_fixed_secondsX(); // Assume interrupts already disabled
57 extern fix timer_get_approx_seconds(); // Returns time since program started... accurate to 1/120th of a second
58 extern void timer_set_joyhandler( void (*joy_handler)() );
60 #define timer_get_fixed_secondsX timer_get_fixed_seconds
61 //#define timer_get_approx_seconds timer_get_fixed_seconds
62 extern fix timer_get_approx_seconds();
65 //NOT_USED extern unsigned int timer_get_microseconds();
66 //NOT_USED extern unsigned int timer_get_milliseconds100();
67 //NOT_USED extern unsigned int timer_get_milliseconds10();
68 //NOT_USED extern unsigned int timer_get_milliseconds();
69 //NOT_USED extern unsigned int timer_get_millisecondsX(); // Assume interrupts disabled
71 void timer_delay(fix seconds);
73 //==========================================================================
74 // Use to access the BIOS ticker... ie... i = TICKER
76 #define TICKER (timer_get_fixed_seconds())
82 #define TICKER (*(volatile int *)0x46C)
85 #include <sys/farptr.h>
86 #define TICKER _farpeekl(_dos_ds, 0x46c)
88 #define USECS_PER_READING( start, stop, frames ) (((stop-start)*54945)/frames)
92 #define approx_usec_to_fsec(usec) ((usec) >> 4)
93 #define approx_fsec_to_usec(fsec) ((fsec) << 4)
94 #define approx_msec_to_fsec(msec) ((msec) << 6)
95 #define approx_fsec_to_msec(fsec) ((fsec) >> 6)