tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC15XX/rtc_api.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 #if DEVICE_RTC
  19
  20 void rtc_init(void)
  21 {
  22     // Enables clock for RTC
  23     LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 23);
  24
  25     // Software reset
  26     LPC_RTC->CTRL |= 1;
  27
  28     LPC_RTC->COUNT = 0;
  29
  30     // Enabled RTC
  31     LPC_RTC->CTRL |= (1 << 7);
  32     // clear reset
  33     LPC_RTC->CTRL &= ~1;
  34 }
  35
  36 void rtc_free(void)
  37 {
  38     LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 23);
  39     LPC_RTC->CTRL &= ~(1 << 7);
  40 }
  41
  42 int rtc_isenabled(void)
  43 {
  44     return (((LPC_RTC->CTRL) & 0x80) != 0);
  45 }
  46
  47 time_t rtc_read(void)
  48 {
  49     return (time_t)LPC_RTC->COUNT;
  50 }
  51
  52 void rtc_write(time_t t)
  53 {
  54     // Disabled RTC
  55     LPC_RTC->CTRL &= ~(1 << 7);
  56
  57     // Set count
  58     LPC_RTC->COUNT = t;
  59
  60     //Enabled RTC
  61     LPC_RTC->CTRL |= (1 << 7);
  62 }
  63
  64 #endif