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48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
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* SPDX-FileCopyrightText: 2024 ML!PA Consulting GmbH
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* SPDX-License-Identifier: LGPL-2.1-only
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*/
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/**
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* @ingroup tests
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* @{
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*
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* @file
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* @brief Busy Wait loop Test Application
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*
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* This can be used to determine `CPU_CYCLES_PER_LOOP` by
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* comparing the time the busy wait loop took with the
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* actual µsec timer.
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*
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* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
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* @}
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*/
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#include <stdio.h>
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#include "busy_wait.h"
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#include "ztimer/stopwatch.h"
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static inline void _measure_interval(ztimer_stopwatch_t *clock, unsigned usec)
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{
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unsigned usec_real;
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printf("waiting for %u µs…\n", usec);
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ztimer_stopwatch_start(clock);
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busy_wait_us(usec);
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usec_real = ztimer_stopwatch_measure(clock);
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printf("took %u µs (diff: %d µs)\n", usec_real, (int)usec_real - usec);
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}
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int main(void)
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{
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ztimer_stopwatch_t clock;
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ztimer_stopwatch_init(ZTIMER_USEC, &clock);
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_measure_interval(&clock, 10);
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_measure_interval(&clock, 100);
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_measure_interval(&clock, 1000);
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_measure_interval(&clock, 10000);
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return 0;
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}
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