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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 "platform/mbed_critical.h" 00019 #include "platform/mbed_rtc_time.h" 00020 #include "platform/SingletonPtr.h" 00021 #include "platform/PlatformMutex.h" 00022 00023 static SingletonPtr<PlatformMutex> _mutex; 00024 00025 #if DEVICE_RTC 00026 00027 static void (*_rtc_init)(void) = rtc_init; 00028 static int (*_rtc_isenabled)(void) = rtc_isenabled; 00029 static time_t (*_rtc_read)(void) = rtc_read; 00030 static void (*_rtc_write)(time_t t) = rtc_write; 00031 00032 #elif DEVICE_LPTICKER 00033 00034 #include "drivers/LowPowerTimer.h" 00035 00036 static SingletonPtr<mbed::LowPowerTimer> _rtc_lp_timer; 00037 static uint64_t _rtc_lp_base; 00038 static bool _rtc_enabled; 00039 00040 static void _rtc_lpticker_init(void) 00041 { 00042 _rtc_lp_timer->start(); 00043 _rtc_enabled = true; 00044 } 00045 00046 static int _rtc_lpticker_isenabled(void) 00047 { 00048 return (_rtc_enabled == true); 00049 } 00050 00051 static time_t _rtc_lpticker_read(void) 00052 { 00053 return (uint64_t)_rtc_lp_timer->read() + _rtc_lp_base; 00054 } 00055 00056 static void _rtc_lpticker_write(time_t t) 00057 { 00058 _rtc_lp_base = t; 00059 } 00060 00061 static void (*_rtc_init)(void) = _rtc_lpticker_init; 00062 static int (*_rtc_isenabled)(void) = _rtc_lpticker_isenabled; 00063 static time_t (*_rtc_read)(void) = _rtc_lpticker_read; 00064 static void (*_rtc_write)(time_t t) = _rtc_lpticker_write; 00065 00066 #else /* DEVICE_LPTICKER */ 00067 00068 static void (*_rtc_init)(void) = NULL; 00069 static int (*_rtc_isenabled)(void) = NULL; 00070 static time_t (*_rtc_read)(void) = NULL; 00071 static void (*_rtc_write)(time_t t) = NULL; 00072 #endif /* DEVICE_LPTICKER */ 00073 00074 #ifdef __cplusplus 00075 extern "C" { 00076 #endif 00077 #if defined (__ICCARM__) 00078 time_t __time32(time_t *timer) 00079 #else 00080 time_t time(time_t *timer) 00081 #endif 00082 00083 { 00084 _mutex->lock(); 00085 if (_rtc_isenabled != NULL) { 00086 if (!(_rtc_isenabled())) { 00087 set_time(0); 00088 } 00089 } 00090 00091 time_t t = (time_t)-1; 00092 if (_rtc_read != NULL) { 00093 t = _rtc_read(); 00094 } 00095 00096 if (timer != NULL) { 00097 *timer = t; 00098 } 00099 _mutex->unlock(); 00100 return t; 00101 } 00102 00103 void set_time(time_t t) { 00104 _mutex->lock(); 00105 if (_rtc_init != NULL) { 00106 _rtc_init(); 00107 } 00108 if (_rtc_write != NULL) { 00109 _rtc_write(t); 00110 } 00111 _mutex->unlock(); 00112 } 00113 00114 void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void)) { 00115 _mutex->lock(); 00116 _rtc_read = read_rtc; 00117 _rtc_write = write_rtc; 00118 _rtc_init = init_rtc; 00119 _rtc_isenabled = isenabled_rtc; 00120 _mutex->unlock(); 00121 } 00122 00123 00124 00125 #ifdef __cplusplus 00126 } 00127 #endif
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