123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051 |
- #ifndef TIMER_H
- #define TIMER_H
- #include <stdint.h>
- typedef unsigned int tick_t;
- extern volatile tick_t ticks;
- #define HZ 100
- /**
- * getticks - return the current system tick count
- *
- * This inline function returns the current system tick count.
- */
- static inline tick_t getticks(void) {
- return ticks;
- }
- #define MS_TO_TICKS(x) (x/10)
- /* Adapted from Linux 2.6 include/linux/jiffies.h:
- *
- * These inlines deal with timer wrapping correctly. You are
- * strongly encouraged to use them
- * 1. Because people otherwise forget
- * 2. Because if the timer wrap changes in future you won't have to
- * alter your driver code.
- *
- * time_after(a,b) returns true if the time a is after time b.
- *
- * Do this with "<0" and ">=0" to only test the sign of the result. A
- * good compiler would generate better code (and a really good compiler
- * wouldn't care). Gcc is currently neither.
- * (">=0" refers to the time_after_eq macro which wasn't copied)
- */
- #define time_after(a,b) \
- ((int)(b) - (int)(a) < 0)
- #define time_before(a,b) time_after(b,a)
- void timer_init(void);
- /* delay for "time" microseconds - uses the RIT */
- void delay_us(unsigned int time);
- /* delay for "time" milliseconds - uses the RIT */
- void delay_ms(unsigned int time);
- void sleep_ms(unsigned int time);
- #endif
|