52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#ifndef TIMER_H
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#define TIMER_H
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#include <stdint.h>
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typedef unsigned int tick_t;
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extern volatile tick_t ticks;
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#define HZ 100
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/**
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* getticks - return the current system tick count
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*
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* This inline function returns the current system tick count.
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*/
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static inline tick_t getticks(void) {
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return ticks;
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}
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#define MS_TO_TICKS(x) (x/10)
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/* Adapted from Linux 2.6 include/linux/jiffies.h:
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*
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* These inlines deal with timer wrapping correctly. You are
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* strongly encouraged to use them
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* 1. Because people otherwise forget
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* 2. Because if the timer wrap changes in future you won't have to
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* alter your driver code.
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*
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* time_after(a,b) returns true if the time a is after time b.
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*
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* Do this with "<0" and ">=0" to only test the sign of the result. A
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* good compiler would generate better code (and a really good compiler
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* wouldn't care). Gcc is currently neither.
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* (">=0" refers to the time_after_eq macro which wasn't copied)
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*/
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#define time_after(a,b) \
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((int)(b) - (int)(a) < 0)
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#define time_before(a,b) time_after(b,a)
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void timer_init(void);
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/* delay for "time" microseconds - uses the RIT */
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void delay_us(unsigned int time);
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/* delay for "time" milliseconds - uses the RIT */
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void delay_ms(unsigned int time);
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void sleep_ms(unsigned int time);
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#endif
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