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123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* Copyright (C) 2022 SSV Software Systems GmbH
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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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 Benchmarks ztimer_acquire() and ztimer_release()
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*
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* @author Juergen Fitschen <me@jue.yt>
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*
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* @}
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#include "ztimer.h"
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#include "ztimer/config.h"
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#include "periph/timer.h"
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#include "periph_conf.h"
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#if IS_ACTIVE(MODULE_ZTIMER_SEC)
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# define CLOCK ZTIMER_SEC
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#elif IS_ACTIVE(MODULE_ZTIMER_MSEC)
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# define CLOCK ZTIMER_MSEC
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#elif IS_ACTIVE(MODULE_ZTIMER_USEC)
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# define CLOCK ZTIMER_USEC
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# define CLOCK_IS_ZTIMER_USEC
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#else
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# error "No ztimer clock selected!"
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#endif
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#ifndef COMPARE_TIMER_DEV
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# if IS_ACTIVE(MODULE_ZTIMER_PERIPH_TIMER)
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# if CONFIG_ZTIMER_USEC_DEV == TIMER_DEV(0)
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# define COMPARE_TIMER_DEV TIMER_DEV(1)
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# else
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# define COMPARE_TIMER_DEV TIMER_DEV(0)
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# endif
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# else
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# define COMPARE_TIMER_DEV TIMER_DEV(0)
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# endif
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#endif
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#ifndef COMPARE_TIMER_FREQ
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# define COMPARE_TIMER_FREQ 1000000U
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#endif
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static inline uint32_t bench_start(uint32_t adjust)
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{
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return timer_read(COMPARE_TIMER_DEV) + adjust;
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}
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static inline uint32_t bench_finish(const char *name, uint32_t start)
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{
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uint32_t stop = timer_read(COMPARE_TIMER_DEV);
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uint32_t diff = stop - start;
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if (name) {
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printf(" - %s took %"PRIu32" ticks\n", name, diff);
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}
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return diff;
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}
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static inline uint32_t bench_overhead(void) {
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uint32_t start = bench_start(0);
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uint32_t diff = bench_finish(NULL, start);
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return diff;
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}
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int main(void)
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{
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uint32_t start, adjust;
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uint32_t first_acquire, second_acquire;
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uint32_t poweron_diff;
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timer_init(COMPARE_TIMER_DEV, COMPARE_TIMER_FREQ, NULL, NULL);
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adjust = bench_overhead();
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printf("Compare timer frequency: %"PRIu32"Hz\n", (uint32_t) COMPARE_TIMER_FREQ);
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printf("Compare timer overhead: %"PRIu32" ticks (will be taken into account)\n", adjust);
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puts("---");
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puts("Benchmarking:");
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start = bench_start(adjust);
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ztimer_acquire(CLOCK);
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first_acquire = bench_finish("ztimer_acquire() on inactive clock", start);
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start = bench_start(adjust);
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ztimer_acquire(CLOCK);
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second_acquire = bench_finish("ztimer_acquire() on active clock", start);
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start = bench_start(adjust);
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ztimer_release(CLOCK);
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bench_finish("ztimer_release() with users left", start);
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start = bench_start(adjust);
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ztimer_release(CLOCK);
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bench_finish("ztimer_release() with no users left", start);
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puts("---");
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poweron_diff = first_acquire - second_acquire;
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#if defined(CLOCK_IS_ZTIMER_USEC) && COMPARE_TIMER_FREQ == 1000000U
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printf("Add this to you board.h:\n");
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printf(" #define CONFIG_ZTIMER_USEC_ADJUST_CLOCK_START %"PRIu32"\n", poweron_diff);
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#else
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printf("If the ztimer clock runs with with a frequency of %"PRIu32"Hz, set\n",
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(uint32_t) COMPARE_TIMER_FREQ);
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printf(" clock->adjust_clock_start = %"PRIu32"\n", poweron_diff);
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#endif
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return 0;
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}
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