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The start/stop overhead that might by introduced by ztimer_acquire() and ztimer_release() called during ztimer_set() resp. ztimer_handler() should not be mesured here. It has its own adjustment field. Furthermore, the overhead mesaurement uses ztimer_now(). It is allowed to called it only after the clock has been acquired.
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
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* Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
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* 2020 Freie Universität Berlin
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* 2020 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup sys_ztimer_overhead
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* @{
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*
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* @file
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* @brief ztimer overhead measurement functions
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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*
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* @}
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*/
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#include "ztimer.h"
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#include "ztimer/overhead.h"
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typedef struct {
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ztimer_clock_t *clock;
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volatile uint32_t *val;
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} callback_arg_t;
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static void _callback(void *arg)
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{
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callback_arg_t *callback_arg = (callback_arg_t *)arg;
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*callback_arg->val = ztimer_now(callback_arg->clock);
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}
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int32_t ztimer_overhead_set(ztimer_clock_t *clock, uint32_t base)
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{
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volatile uint32_t after = 0;
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uint32_t pre;
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callback_arg_t arg = { .clock = clock, .val = &after };
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ztimer_t t = { .callback = _callback, .arg = &arg };
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ztimer_acquire(clock);
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pre = ztimer_now(clock);
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ztimer_set(clock, &t, base);
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while (!after) {}
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ztimer_release(clock);
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return after - pre - base;
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}
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int32_t ztimer_overhead_sleep(ztimer_clock_t *clock, uint32_t base)
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{
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ztimer_acquire(clock);
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uint32_t pre = ztimer_now(clock);
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ztimer_sleep(clock, base);
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uint32_t after = ztimer_now(clock);
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ztimer_release(clock);
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return after - pre - base;
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}
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