tmk_core/tool/mbed/mbed-sdk/libraries/mbed/common/rtc_time.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "rtc_api.h"
  17
  18 #include <time.h>
  19 #include "rtc_time.h"
  20 #include "us_ticker_api.h"
  21
  22 #if DEVICE_RTC
  23 static void (*_rtc_init)(void) = rtc_init;
  24 static int (*_rtc_isenabled)(void) = rtc_isenabled;
  25 static time_t (*_rtc_read)(void) = rtc_read;
  26 static void (*_rtc_write)(time_t t) = rtc_write;
  27 #else
  28 static void (*_rtc_init)(void) = NULL;
  29 static int (*_rtc_isenabled)(void) = NULL;
  30 static time_t (*_rtc_read)(void) = NULL;
  31 static void (*_rtc_write)(time_t t) = NULL;
  32 #endif
  33
  34 #ifdef __cplusplus
  35 extern "C" {
  36 #endif
  37 #if defined (__ICCARM__)
  38 time_t __time32(time_t *timer)
  39 #else
  40 time_t time(time_t *timer)
  41 #endif
  42
  43 {
  44     if (_rtc_isenabled != NULL) {
  45         if (!(_rtc_isenabled())) {
  46             set_time(0);
  47         }
  48     }
  49
  50     time_t t = 0;
  51     if (_rtc_read != NULL) {
  52         t = _rtc_read();
  53     }
  54
  55     if (timer != NULL) {
  56         *timer = t;
  57     }
  58     return t;
  59 }
  60
  61 void set_time(time_t t) {
  62     if (_rtc_init != NULL) {
  63         _rtc_init();
  64     }
  65     if (_rtc_write != NULL) {
  66         _rtc_write(t);
  67     }
  68 }
  69
  70 clock_t clock() {
  71     clock_t t = us_ticker_read();
  72     t /= 1000000 / CLOCKS_PER_SEC; // convert to processor time
  73     return t;
  74 }
  75
  76 void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void)) {
  77     __disable_irq();
  78     _rtc_read = read_rtc;
  79     _rtc_write = write_rtc;
  80     _rtc_init = init_rtc;
  81     _rtc_isenabled = isenabled_rtc;
  82     __enable_irq();
  83 }
  84
  85
  86
  87 #ifdef __cplusplus
  88 }
  89 #endif