jitter_drift.c File Reference

#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/tc_util.h>
#include <zephyr/ztest.h>

Functions
static void	timer_period_fn (struct k_timer *t)
static void	collect_timer_period_time_samples (void)
static void	timer_startdelay_fn (struct k_timer *t)
static void	collect_timer_startdelay_time_samples (void)
static uint64_t	periodic_diff (uint64_t later, uint64_t earlier)
static double	cycles_to_us (uint64_t cycles)
static void	do_test_using (void(*sample_collection_fn)(void), const char *mechanism)
	Test a timers jitter and drift over time.
void	test_jitter_drift_timer_period (void)
void	test_jitter_drift_timer_startdelay (void)
	ZTEST_SUITE (timer_jitter_drift, NULL, NULL, NULL, NULL, NULL)

Variables
static uint32_t	periodic_idx
static uint64_t	periodic_data [CONFIG_TIMER_TEST_SAMPLES+1]
static uint64_t	periodic_start
static uint64_t	periodic_end
static struct k_timer	periodic_timer
static struct k_sem	periodic_sem

Function Documentation

collect_timer_period_time_samples()

static void collect_timer_period_time_samples ( void )

static

collect_timer_startdelay_time_samples()

static void collect_timer_startdelay_time_samples ( void )

static

cycles_to_us()

static double cycles_to_us ( uint64_t cycles )

static

do_test_using()

static void do_test_using ( void(* sample_collection_fn )(void), const char * mechanism )

static

Test a timers jitter and drift over time.

periodic_diff()

static uint64_t periodic_diff ( uint64_t later, uint64_t earlier )

static

test_jitter_drift_timer_period()

void test_jitter_drift_timer_period

(

void

)

test_jitter_drift_timer_startdelay()

void test_jitter_drift_timer_startdelay

(

void

)

timer_period_fn()

static void timer_period_fn ( struct k_timer * t )

static

timer_startdelay_fn()

static void timer_startdelay_fn ( struct k_timer * t )

static

ZTEST_SUITE()

ZTEST_SUITE	(	timer_jitter_drift	,
		NULL	,
		NULL	,
		NULL	,
		NULL	,
		NULL	)

Variable Documentation

periodic_data

uint64_t periodic_data[CONFIG_TIMER_TEST_SAMPLES+1]

static

periodic_end

uint64_t periodic_end

static

periodic_idx

uint32_t periodic_idx

static

periodic_sem

struct k_sem periodic_sem

static

periodic_start

uint64_t periodic_start

static

periodic_timer

struct k_timer periodic_timer

static