mbed_rtc_time.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "hal/rtc_api.h"
00017 
00018 #include <time.h>
00019 #include "platform/mbed_critical.h"
00020 #include "platform/mbed_rtc_time.h"
00021 #include "hal/us_ticker_api.h"
00022 #include "platform/SingletonPtr.h"
00023 #include "platform/PlatformMutex.h"
00024 
00025 static SingletonPtr<PlatformMutex>  _mutex;
00026 
00027 #if DEVICE_RTC
00028 static void (*_rtc_init)(void) = rtc_init;
00029 static int (*_rtc_isenabled)(void) = rtc_isenabled;
00030 static time_t (*_rtc_read)(void) = rtc_read;
00031 static void (*_rtc_write)(time_t t) = rtc_write;
00032 #else
00033 static void (*_rtc_init)(void) = NULL;
00034 static int (*_rtc_isenabled)(void) = NULL;
00035 static time_t (*_rtc_read)(void) = NULL;
00036 static void (*_rtc_write)(time_t t) = NULL;
00037 #endif
00038 
00039 #ifdef __cplusplus
00040 extern "C" {
00041 #endif
00042 #if defined (__ICCARM__)
00043 time_t __time32(time_t *timer)
00044 #else
00045 time_t time(time_t *timer)
00046 #endif
00047 
00048 {
00049     _mutex->lock();
00050     if (_rtc_isenabled != NULL) {
00051         if (!(_rtc_isenabled())) {
00052             set_time(0);
00053         }
00054     }
00055     
00056     time_t t = 0;
00057     if (_rtc_read != NULL) {
00058         t = _rtc_read();
00059     }
00060 
00061     if (timer != NULL) {
00062         *timer = t;
00063     }
00064     _mutex->unlock();
00065     return t;
00066 }
00067 
00068 void set_time(time_t t) {
00069     _mutex->lock();
00070     if (_rtc_init != NULL) {
00071         _rtc_init();
00072     }
00073     if (_rtc_write != NULL) {
00074         _rtc_write(t);
00075     }
00076     _mutex->unlock();
00077 }
00078 
00079 clock_t clock() {
00080     _mutex->lock();
00081     clock_t t = us_ticker_read();
00082     t /= 1000000 / CLOCKS_PER_SEC; // convert to processor time
00083     _mutex->unlock();
00084     return t;
00085 }
00086 
00087 void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void)) {
00088     _mutex->lock();
00089     _rtc_read = read_rtc;
00090     _rtc_write = write_rtc;
00091     _rtc_init = init_rtc;
00092     _rtc_isenabled = isenabled_rtc;
00093     _mutex->unlock();
00094 }
00095 
00096 
00097 
00098 #ifdef __cplusplus
00099 }
00100 #endif
00101