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RIOT/cpu/lpc2387/periph/rtc.c 4.99 KB
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  /*
   * Copyright 2008-2010, Freie Universitaet Berlin (FUB). All rights reserved.
   * Copyright 2014 INRIA
   *
   * This file is subject to the terms and conditions of the GNU Lesser
   * General Public License v2.1. See the file LICENSE in the top level
   * directory for more details.
   */
  
   /**
    * @ingroup     cpu_lpc2387
    * @ingroup     drivers_periph_rtc
    * @{
    *
    * @file
    * @brief       Peripheral UART driver implementation
    *
    * @author      Kaspar Schleiser <kaspar@schleiser.de>
    *
    * @}
    */
  
  #include <sys/time.h>
  #include <stdint.h>
  #include <string.h>
  
  #include "kernel_types.h"
  
  /* cpu */
  #include "periph/rtc.h"
  #include "VIC.h"
  #include "lpc2387.h"
  
  #define ENABLE_DEBUG (0)
  #include "debug.h"
  
  /* Alarm callback */
  static rtc_alarm_cb_t _cb;
  
  /* Argument to alarm callback */
  static void *_cb_arg;
  
  /* internal function to set time based on time_t */
  static void _rtc_set(time_t time);
  
  void RTC_IRQHandler(void) __attribute__((interrupt("IRQ")));
  
  void rtc_init(void)
  {
      PCONP |= BIT9;
      RTC_AMR = 0xff;                         /* disable alarm irq */
      RTC_CIIR = 0;                           /* disable increase irq */
      RTC_CISS = 0;                           /* disable subsecond irq */
  
      INTWAKE |= BIT15;                       /* rtc irq wakes up mcu from power down */
  
      RTC_CCR = CCR_CLKSRC;                   /* Clock from external 32 kHz Osc. */
  
      /* initialize clock with valid unix compatible values
       * If RTC_YEAR contains an value larger unix time_t we must reset. */
      if (RTC_YEAR > 2037) {
          _rtc_set(0);
      }
  
      DEBUG("%2lu.%2lu.%4lu  %2lu:%2lu:%2lu\n",
              RTC_DOM, RTC_MONTH, RTC_YEAR, RTC_HOUR, RTC_MIN, RTC_SEC);
  }
  
  /**
   * @brief   Sets the current time in broken down format directly from to RTC
   * @param[in]   localt      Pointer to structure with time to set
   */
  int rtc_set_time(struct tm *localt)
  {
      if (localt == NULL) {
          return -1;
      }
  
      /* set clock */
      RTC_SEC = localt->tm_sec;
      RTC_MIN = localt->tm_min;
      RTC_HOUR = localt->tm_hour;
      RTC_DOM = localt->tm_mday;
      RTC_DOW = localt->tm_wday;
      RTC_DOY = localt->tm_yday;
      RTC_MONTH = localt->tm_mon + 1;
      RTC_YEAR = localt->tm_year;
  
      return 0;
  }
  
  int rtc_get_time(struct tm *localt)
  {
      if (localt != NULL) {
          localt->tm_sec = RTC_SEC;
          localt->tm_min = RTC_MIN;
          localt->tm_hour = RTC_HOUR;
          localt->tm_mday = RTC_DOM;
          localt->tm_wday = RTC_DOW;
          localt->tm_yday = RTC_DOY;
          localt->tm_mon = RTC_MONTH - 1;
          localt->tm_year = RTC_YEAR;
          localt->tm_isdst = -1; /* not available */
          return 0;
      }
      return -1;
  }
  
  
  int rtc_set_alarm(struct tm *localt, rtc_alarm_cb_t cb, void *arg)
  {
      (void) arg;
      if (localt != NULL) {
          RTC_ALSEC = localt->tm_sec;
          RTC_ALMIN = localt->tm_min;
          RTC_ALHOUR = localt->tm_hour;
          RTC_ALDOM = localt->tm_mday;
          RTC_ALDOW = localt->tm_wday;
          RTC_ALDOY = localt->tm_yday;
          RTC_ALMON = localt->tm_mon + 1;
          RTC_ALYEAR = localt->tm_year;
          RTC_AMR = 0;                                            /* set wich alarm fields to check */
          DEBUG("alarm set %2lu.%2lu.%4lu  %2lu:%2lu:%2lu\n",
                RTC_ALDOM, RTC_ALMON, RTC_ALYEAR, RTC_ALHOUR, RTC_ALMIN, RTC_ALSEC);
  
          _cb = cb;
          return 0;
      }
      else if (cb == NULL) {
          return -1;
      }
  
      RTC_AMR = 0xff;
      return -2;
  }
  
  int rtc_get_alarm(struct tm *localt)
  {
      if (localt != NULL) {
          localt->tm_sec = RTC_ALSEC;
          localt->tm_min = RTC_ALMIN;
          localt->tm_hour = RTC_ALHOUR;
          localt->tm_mday = RTC_ALDOM;
          localt->tm_wday = RTC_ALDOW;
          localt->tm_yday = RTC_ALDOY;
          localt->tm_mon = RTC_ALMON - 1;
          localt->tm_year = RTC_ALYEAR;
          localt->tm_isdst = -1; /* not available */
  
          return 0;
      }
  
      return -1;
  }
  
  void rtc_clear_alarm(void)
  {
      RTC_AMR = 0xff;
  }
  
  void rtc_poweron(void)
  {
      PCONP |= BIT9;
      RTC_ILR = (ILR_RTSSF | ILR_RTCCIF | ILR_RTCALF);    /* clear interrupt flags */
      RTC_CCR |= CCR_CLKEN;                               /* enable clock */
      install_irq(RTC_INT, &RTC_IRQHandler, IRQP_RTC);    /* install interrupt handler */
  }
  
  void rtc_poweroff(void)
  {
      RTC_CCR &= ~CCR_CLKEN;  /* disable clock */
      install_irq(RTC_INT, NULL, 0);
      RTC_ILR = 0;
      PCONP &= ~BIT9;
  }
  
  void RTC_IRQHandler(void)
  {
      if (RTC_ILR & ILR_RTSSF) {
          /* sub second interrupt (does not need flag-clearing) */
      }
      else if (RTC_ILR & ILR_RTCCIF) {
          /* counter increase interrupt */
      }
      else if (RTC_ILR & ILR_RTCALF) {
          RTC_ILR |= ILR_RTCALF;
          RTC_AMR = 0xff;                     /* disable alarm irq */
          if (_cb) {
              _cb(_cb_arg);
          }
          DEBUG("Ring\n");
      }
  
      VICVectAddr = 0;                        /* Acknowledge Interrupt */
  }
  
  static void _rtc_set(time_t time)
  {
      struct tm *localt;
      localt = localtime(&time);                      /* convert seconds to broken-down time */
      rtc_set_time(localt);
  }