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kernel: Add new uniform time unit conversion API

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Zephyr has always had an ad hoc collection of time unit macros and
conversion routines in a selection of different units, precisions,
rounding modes and naming conventions.

This adds a single optimized generator to produce any such conversion,
and enumerates it to produce a collection of 48 utilities in all
useful combinations as a single supported kernel API going forward.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2019-06-28 11:16:50 -07:00 • committed by Carles Cufí
commit 370c39516b
2 changed files with 1034 additions and 22 deletions
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24
include/sys_clock.h
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@ -22,6 +22,8 @@
#include <toolchain.h>
#include <zephyr/types.h>
#include <time_units.h>
#ifdef __cplusplus
extern "C" {
#endif
@ -31,26 +33,6 @@ extern int _sys_clock_always_on;
extern void z_enable_sys_clock(void);
#endif
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
__syscall int z_clock_hw_cycles_per_sec_runtime_get(void);
static inline int z_impl_z_clock_hw_cycles_per_sec_runtime_get(void)
{
extern int z_clock_hw_cycles_per_sec;
return z_clock_hw_cycles_per_sec;
}
#endif /* CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME */
static inline int sys_clock_hw_cycles_per_sec(void)
{
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
return z_clock_hw_cycles_per_sec_runtime_get();
#else
return CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
#endif
}
/* Note that some systems with comparatively slow cycle counters
* experience precision loss when doing math like this. In the
* general case it is not correct that "cycles" are much faster than
@ -243,6 +225,4 @@ struct _timeout {
}
#endif
#include <syscalls/sys_clock.h>
#endif /* ZEPHYR_INCLUDE_SYS_CLOCK_H_ */