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81 lines
3.4 KiB
C
81 lines
3.4 KiB
C
/**
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* Copyright (c) 2016 - 2017, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include "app_timer.h"
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#include "es_app_config.h"
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#define TICKS_1_SECOND APP_TIMER_TICKS(1000, APP_TIMER_PRESCALER)
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static uint32_t m_ticks_last_returned_second = 0; //!< Tick count at last second returned from 'es_security_timing_seconds_passed'.
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uint32_t es_security_timing_seconds_passed(void)
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{
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uint32_t ticks_current = app_timer_cnt_get();
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uint32_t ticks_diff;
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uint32_t err_code;
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err_code = app_timer_cnt_diff_compute(ticks_current, m_ticks_last_returned_second, &ticks_diff);
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APP_ERROR_CHECK(err_code);
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if(ticks_diff > TICKS_1_SECOND)
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{
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// Update 'm_ticks_last_returned_second' so it points to the last 'whole second' as it is this point we are referring to when
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// returning the number of seconds passed since last invocation.
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// I.E. if this function is called after 1.5 seconds and 2.0 seconds, 'm_ticks_last_returned_second' must point to 1.0 seconds
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// after the first invocation in order to return '1' upon the second invocation.
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uint32_t current_second_ms = (ticks_current / TICKS_1_SECOND) * 1000;
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m_ticks_last_returned_second = APP_TIMER_TICKS(current_second_ms, APP_TIMER_PRESCALER);
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return ticks_diff / TICKS_1_SECOND;
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}
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return 0;
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}
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void es_security_timing_init(void)
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{
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m_ticks_last_returned_second = 0;
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}
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