rtc_time.h

00001 
00002 /** \addtogroup platform */
00003 /** @{*/
00004 /* mbed Microcontroller Library
00005  * Copyright (c) 2006-2013 ARM Limited
00006  *
00007  * Licensed under the Apache License, Version 2.0 (the "License");
00008  * you may not use this file except in compliance with the License.
00009  * You may obtain a copy of the License at
00010  *
00011  *     http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  * Unless required by applicable law or agreed to in writing, software
00014  * distributed under the License is distributed on an "AS IS" BASIS,
00015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016  * See the License for the specific language governing permissions and
00017  * limitations under the License.
00018  */
00019 
00020 #include <time.h>
00021 
00022 #ifdef __cplusplus
00023 extern "C" {
00024 #endif
00025 
00026 /** Implementation of the C time.h functions
00027  *
00028  * Provides mechanisms to set and read the current time, based
00029  * on the microcontroller Real-Time Clock (RTC), plus some
00030  * standard C manipulation and formating functions.
00031  *
00032  * Example:
00033  * @code
00034  * #include "mbed.h"
00035  *
00036  * int main() {
00037  *     set_time(1256729737);  // Set RTC time to Wed, 28 Oct 2009 11:35:37
00038  *
00039  *     while(1) {
00040  *         time_t seconds = time(NULL);
00041  *
00042  *         printf("Time as seconds since January 1, 1970 = %d\n", seconds);
00043  *
00044  *         printf("Time as a basic string = %s", ctime(&seconds));
00045  *
00046  *         char buffer[32];
00047  *         strftime(buffer, 32, "%I:%M %p\n", localtime(&seconds));
00048  *         printf("Time as a custom formatted string = %s", buffer);
00049  *
00050  *         wait(1);
00051  *     }
00052  * }
00053  * @endcode
00054  */
00055 
00056 /** Set the current time
00057  *
00058  * Initialises and sets the time of the microcontroller Real-Time Clock (RTC)
00059  * to the time represented by the number of seconds since January 1, 1970
00060  * (the UNIX timestamp).
00061  *
00062  * @param t Number of seconds since January 1, 1970 (the UNIX timestamp)
00063  *
00064  * @Note Synchronization level: Thread safe
00065  *
00066  * Example:
00067  * @code
00068  * #include "mbed.h"
00069  *
00070  * int main() {
00071  *     set_time(1256729737); // Set time to Wed, 28 Oct 2009 11:35:37
00072  * }
00073  * @endcode
00074  */
00075 void set_time(time_t t);
00076 
00077 /** Attach an external RTC to be used for the C time functions
00078  *
00079  * @Note Synchronization level: Thread safe
00080  *
00081  * @param read_rtc pointer to function which returns current UNIX timestamp
00082  * @param write_rtc pointer to function which sets current UNIX timestamp, can be NULL
00083  * @param init_rtc pointer to funtion which initializes RTC, can be NULL
00084  * @param isenabled_rtc pointer to function wich returns if the rtc is enabled, can be NULL
00085  */
00086 void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void));
00087 
00088 #ifdef __cplusplus
00089 }
00090 #endif
00091 
00092 /** @}*/