228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
/*
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* Copyright (c) 2014-2015 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Variables needed needed for system clock
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*
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*
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* Declare variables used by both system timer device driver and kernel
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* components that use timer functionality.
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*/
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#ifndef ZEPHYR_INCLUDE_SYS_CLOCK_H_
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#define ZEPHYR_INCLUDE_SYS_CLOCK_H_
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#include <sys/util.h>
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#include <sys/dlist.h>
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#include <toolchain.h>
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#include <zephyr/types.h>
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#include <sys/time_units.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @addtogroup clock_apis
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* @{
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*/
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/**
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* @brief Tick precision used in timeout APIs
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*
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* This type defines the word size of the timeout values used in
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* k_timeout_t objects, and thus defines an upper bound on maximum
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* timeout length (or equivalently minimum tick duration). Note that
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* this does not affect the size of the system uptime counter, which
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* is always a 64 bit count of ticks.
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*/
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#ifdef CONFIG_TIMEOUT_64BIT
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typedef s64_t k_ticks_t;
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#else
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typedef u32_t k_ticks_t;
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#endif
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#define K_TICKS_FOREVER ((k_ticks_t) -1)
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#ifndef CONFIG_LEGACY_TIMEOUT_API
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/**
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* @brief Kernel timeout type
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*
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* Timeout arguments presented to kernel APIs are stored in this
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* opaque type, which is capable of representing times in various
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* formats and units. It should be constructed from application data
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* using one of the macros defined for this purpose (e.g. `K_MSEC()`,
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* `K_TIMEOUT_ABS_TICKS()`, etc...), or be one of the two constants
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* K_NO_WAIT or K_FOREVER. Applications should not inspect the
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* internal data once constructed. Timeout values may be compared for
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* equality with the `K_TIMEOUT_EQ()` macro.
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*/
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typedef struct {
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k_ticks_t ticks;
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} k_timeout_t;
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/**
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* @brief Compare timeouts for equality
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*
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* The k_timeout_t object is an opaque struct that should not be
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* inspected by application code. This macro exists so that users can
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* test timeout objects for equality with known constants
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* (e.g. K_NO_WAIT and K_FOREVER) when implementing their own APIs in
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* terms of Zephyr timeout constants.
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*
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* @return True if the timeout objects are identical
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*/
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#define K_TIMEOUT_EQ(a, b) ((a).ticks == (b).ticks)
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#define Z_TIMEOUT_NO_WAIT ((k_timeout_t) {})
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#define Z_TIMEOUT_TICKS(t) ((k_timeout_t) { .ticks = (t) })
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#define Z_FOREVER Z_TIMEOUT_TICKS(K_TICKS_FOREVER)
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#define Z_TIMEOUT_MS(t) Z_TIMEOUT_TICKS(k_ms_to_ticks_ceil32(MAX(t, 0)))
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#define Z_TIMEOUT_US(t) Z_TIMEOUT_TICKS(k_us_to_ticks_ceil32(MAX(t, 0)))
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#define Z_TIMEOUT_NS(t) Z_TIMEOUT_TICKS(k_ns_to_ticks_ceil32(MAX(t, 0)))
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#define Z_TIMEOUT_CYC(t) Z_TIMEOUT_TICKS(k_cyc_to_ticks_ceil32(MAX(t, 0)))
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/* Converts between absolute timeout expiration values (packed into
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* the negative space below K_TICKS_FOREVER) and (non-negative) delta
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* timeout values. If the result of Z_TICK_ABS(t) is >= 0, then the
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* value was an absolute timeout with the returend expiration time.
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* Note that this macro is bidirectional: Z_TICK_ABS(Z_TICK_ABS(t)) ==
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* t for all inputs, and that the representation of K_TICKS_FOREVER is
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* the same value in both spaces! Clever, huh?
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*/
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#define Z_TICK_ABS(t) (K_TICKS_FOREVER - 1 - (t))
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#else
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/* Legacy timeout API */
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typedef s32_t k_timeout_t;
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#define K_TIMEOUT_EQ(a, b) ((a) == (b))
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#define Z_TIMEOUT_NO_WAIT 0
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#define Z_TIMEOUT_TICKS(t) k_ticks_to_ms_ceil32(t)
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#define Z_FOREVER K_TICKS_FOREVER
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#define Z_TIMEOUT_MS(t) (t)
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#define Z_TIMEOUT_US(t) ((t) * 1000)
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#define Z_TIMEOUT_NS(t) ((t) * 1000000)
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#define Z_TIMEOUT_CYC(t) k_cyc_to_ms_ceil32(MAX((t), 0))
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#endif
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/** @} */
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#ifdef CONFIG_TICKLESS_KERNEL
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extern int _sys_clock_always_on;
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extern void z_enable_sys_clock(void);
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#endif
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#if defined(CONFIG_SYS_CLOCK_EXISTS) && \
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(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC == 0)
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#error "SYS_CLOCK_HW_CYCLES_PER_SEC must be non-zero!"
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#endif
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/* number of nsec per usec */
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#define NSEC_PER_USEC 1000U
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/* number of microseconds per millisecond */
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#define USEC_PER_MSEC 1000U
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/* number of milliseconds per second */
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#define MSEC_PER_SEC 1000U
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/* number of microseconds per second */
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#define USEC_PER_SEC ((USEC_PER_MSEC) * (MSEC_PER_SEC))
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/* number of nanoseconds per second */
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#define NSEC_PER_SEC ((NSEC_PER_USEC) * (USEC_PER_MSEC) * (MSEC_PER_SEC))
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/* kernel clocks */
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/*
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* We default to using 64-bit intermediates in timescale conversions,
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* but if the HW timer cycles/sec, ticks/sec and ms/sec are all known
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* to be nicely related, then we can cheat with 32 bits instead.
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*/
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) || \
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(MSEC_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC) || \
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(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC)
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#define _NEED_PRECISE_TICK_MS_CONVERSION
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#endif
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#endif
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#define __ticks_to_ms(t) __DEPRECATED_MACRO \
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k_ticks_to_ms_floor64((u64_t)(t))
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#define z_ms_to_ticks(t) \
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((s32_t)k_ms_to_ticks_ceil32((u32_t)(t)))
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#define __ticks_to_us(t) __DEPRECATED_MACRO \
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((s32_t)k_ticks_to_us_floor32((u32_t)(t)))
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#define z_us_to_ticks(t) __DEPRECATED_MACRO \
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((s32_t)k_us_to_ticks_ceil32((u32_t)(t)))
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#define sys_clock_hw_cycles_per_tick() __DEPRECATED_MACRO \
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((int)k_ticks_to_cyc_floor32(1U))
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#define SYS_CLOCK_HW_CYCLES_TO_NS64(t) __DEPRECATED_MACRO \
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k_cyc_to_ns_floor64((u64_t)(t))
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#define SYS_CLOCK_HW_CYCLES_TO_NS(t) __DEPRECATED_MACRO \
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((u32_t)k_cyc_to_ns_floor64(t))
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/* added tick needed to account for tick in progress */
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#define _TICK_ALIGN 1
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/*
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* SYS_CLOCK_HW_CYCLES_TO_NS_AVG converts CPU clock cycles to nanoseconds
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* and calculates the average cycle time
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*/
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#define SYS_CLOCK_HW_CYCLES_TO_NS_AVG(X, NCYCLES) \
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(u32_t)(k_cyc_to_ns_floor64(X) / NCYCLES)
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/**
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* @defgroup clock_apis Kernel Clock APIs
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* @ingroup kernel_apis
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* @{
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*/
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/**
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* @} end defgroup clock_apis
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*/
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/**
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*
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* @brief Return the lower part of the current system tick count
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*
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* @return the current system tick count
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*
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*/
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u32_t z_tick_get_32(void);
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/**
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*
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* @brief Return the current system tick count
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*
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* @return the current system tick count
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*
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*/
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s64_t z_tick_get(void);
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#ifndef CONFIG_SYS_CLOCK_EXISTS
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#define z_tick_get() (0)
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#define z_tick_get_32() (0)
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#endif
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u64_t z_timeout_end_calc(k_timeout_t timeout);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_SYS_CLOCK_H_ */
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