System Timer

Utility functions for measuring time and busy-waiting short amounts of time. More...

Macros
#define	ST_NOW   ((st_time_t)HW.ST.CLO)
	Return current system timer timestamp. It measures time independent of clock scaling.
#define	ST_1s   ((st_delta_t)1000000)
	System timer frequency in Hz (== timer ticks in 1 s)
#define	ST_1ms   (ST_1s/1000)
	System timer ticks in 1 ms.
#define	ST_1us   (ST_1s/1000000)
	System timer ticks in 1 µs.

Typedefs
typedef uint32_t	st_time_t
	Type for system timer time stamps.
typedef uint32_t	st_delta_t
	Type for system timer time stamp differences.

Functions
static int	st_elapsed (st_time_t before, st_time_t after, st_delta_t diff)
	Return true if after is at least diff ticks after before.
static void	st_delay (st_delta_t delay)
	Busy-wait for the given delay.

Detailed Description

Utility functions for measuring time and busy-waiting short amounts of time.

Declared in raspi/hw.h.