mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2024 ML!PA Consulting GmbH
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU Lesser
|
|
* General Public License v2.1. See the file LICENSE in the top level
|
|
* directory for more details.
|
|
*/
|
|
|
|
/**
|
|
* @ingroup tests
|
|
* @{
|
|
*
|
|
* @file
|
|
* @brief Busy Wait loop Test Application
|
|
*
|
|
* This can be used to determine `CPU_CYCLES_PER_LOOP` by
|
|
* comparing the time the busy wait loop took with the
|
|
* actual µsec timer.
|
|
*
|
|
* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
|
|
* @}
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "busy_wait.h"
|
|
#include "ztimer/stopwatch.h"
|
|
|
|
static inline void _measure_interval(ztimer_stopwatch_t *clock, unsigned usec)
|
|
{
|
|
unsigned usec_real;
|
|
|
|
printf("waiting for %u µs…\n", usec);
|
|
ztimer_stopwatch_start(clock);
|
|
busy_wait_us(usec);
|
|
usec_real = ztimer_stopwatch_measure(clock);
|
|
printf("took %u µs (diff: %d µs)\n", usec_real, (int)usec_real - usec);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
ztimer_stopwatch_t clock;
|
|
ztimer_stopwatch_init(ZTIMER_USEC, &clock);
|
|
|
|
_measure_interval(&clock, 10);
|
|
_measure_interval(&clock, 100);
|
|
_measure_interval(&clock, 1000);
|
|
_measure_interval(&clock, 10000);
|
|
|
|
return 0;
|
|
}
|