mirror of https://github.com/ARMmbed/mbed-os.git
131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
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/** \addtogroup platform */
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/** @{*/
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/**
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* \defgroup platform_rtc_time rtc_time functions
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* @{
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*/
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/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <time.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Timeval definition for non GCC_ARM toolchains */
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#if !defined(__GNUC__) || defined(__CC_ARM) || defined(__clang__)
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struct timeval {
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time_t tv_sec;
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int32_t tv_usec;
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};
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#endif
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/** Implementation of the C time.h functions
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*
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* Provides mechanisms to set and read the current time, based
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* on the microcontroller Real-Time Clock (RTC), plus some
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* standard C manipulation and formatting functions.
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*
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* Example:
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* @code
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* #include "mbed.h"
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*
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* int main() {
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* set_time(1256729737); // Set RTC time to Wed, 28 Oct 2009 11:35:37
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*
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* while (true) {
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* time_t seconds = time(NULL);
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*
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* printf("Time as seconds since January 1, 1970 = %u\n", (unsigned int)seconds);
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*
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* printf("Time as a basic string = %s", ctime(&seconds));
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*
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* char buffer[32];
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* strftime(buffer, 32, "%I:%M %p\n", localtime(&seconds));
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* printf("Time as a custom formatted string = %s", buffer);
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*
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* wait(1);
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* }
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* }
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* @endcode
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*/
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/** Set the current time
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*
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* Initializes and sets the time of the microcontroller Real-Time Clock (RTC)
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* to the time represented by the number of seconds since January 1, 1970
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* (the UNIX timestamp).
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*
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* @param t Number of seconds since January 1, 1970 (the UNIX timestamp)
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*
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* @note Synchronization level: Thread safe
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*
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* Example:
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* @code
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* #include "mbed.h"
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*
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* int main() {
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* set_time(1256729737); // Set time to Wed, 28 Oct 2009 11:35:37
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* }
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* @endcode
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*/
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void set_time(time_t t);
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/** Attach an external RTC to be used for the C time functions
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*
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* @note Synchronization level: Thread safe
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*
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* @param read_rtc pointer to function which returns current UNIX timestamp
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* @param write_rtc pointer to function which sets current UNIX timestamp, can be NULL
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* @param init_rtc pointer to function which initializes RTC, can be NULL
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* @param isenabled_rtc pointer to function which returns if the RTC is enabled, can be NULL
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*/
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void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void));
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/** Standard lib retarget, get time since Epoch
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*
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* @param tv Structure containing time_t seconds and useconds_t microseconds. Due to
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* separate target specific RTC implementations only the seconds component is used.
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* @param tz DEPRECATED IN THE STANDARD: This parameter is left in for legacy code. It is
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* not used.
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* @return 0 on success, -1 on a failure.
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* @note Synchronization level: Thread safe
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*
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*/
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int gettimeofday(struct timeval *tv, void *tz);
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/** Standard lib retarget, set time since Epoch
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*
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* @param tv Structure containing time_t seconds and useconds_t microseconds. Due to
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* separate target specific RTC implementations only the seconds component is used.
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* @param tz DEPRECATED IN THE STANDARD: This parameter is left in for legacy code. It is
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* not used.
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* @return Time in seconds on success, -1 on a failure.
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* @note Synchronization level: Thread safe
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*
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*/
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int settimeofday(const struct timeval *tv, const struct timezone *tz);
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#ifdef __cplusplus
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}
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#endif
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/** @}*/
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/** @}*/
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