blob: deffd165b686979ee51cdb4a7cef6d90bcc98f0b [file] [log] [blame]
/*
* Copyright (c) 2021 Friedt Professional Engineering Services, Inc
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/ztest.h>
#include <zephyr/kernel.h>
static void swap64(uint64_t *a, uint64_t *b)
{
uint64_t t = *a;
*a = *b;
*b = t;
}
static void msg(uint64_t c64)
{
int64_t ms = k_uptime_get();
int s = ms / 1000;
int m = s / 60;
int h = m / 60;
int d = h / 24;
h %= 24;
m %= 60;
s %= 60;
ms %= 1000;
printk("[%03d:%02d:%02d:%02d.%03d]: cycle: %016" PRIx64 "\n", d, h, m, s, (int)ms, c64);
}
uint32_t timeout(uint64_t prev, uint64_t now)
{
uint64_t next = prev + BIT64(32) - now;
next &= UINT32_MAX;
if (next == 0) {
next = UINT32_MAX;
}
return (uint32_t)next;
}
ZTEST(cycle64_tests, test_32bit_wrap_around)
{
enum {
CURR,
PREV,
};
int i;
uint64_t now;
uint64_t c64[2];
printk("32-bit wrap-around should occur every %us\n",
(uint32_t)(BIT64(32) / (uint32_t)sys_clock_hw_cycles_per_sec()));
printk("[ddd:hh:mm:ss.0ms]\n");
c64[CURR] = k_cycle_get_64();
msg(c64[CURR]);
for (i = 0; i < 2; ++i) {
k_sleep(Z_TIMEOUT_CYC(timeout(c64[CURR], k_cycle_get_64())));
now = k_cycle_get_64();
swap64(&c64[PREV], &c64[CURR]);
c64[CURR] = now;
msg(c64[CURR]);
zassert_equal(((c64[CURR] - c64[PREV]) >> 32), 1,
"The 64-bit cycle counter did not increment by 2^32");
}
}
ZTEST_SUITE(cycle64_tests, NULL, NULL, NULL, NULL, NULL);