nuttx/arch/arm/src/stm32/stm32f40xxx_rtc.c

/************************************************************************************
 * arch/arm/src/stm32/stm32f40xxx_rtc.c
 *
 *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ************************************************************************************/

/************************************************************************************
 * Included Files
 ************************************************************************************/

#include <nuttx/config.h>

#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <nuttx/rtc.h>

#include <arch/board/board.h>

#include "up_arch.h"

#include "stm32_rtc.h"

#ifdef CONFIG_RTC

/************************************************************************************
 * Pre-processor Definitions
 ************************************************************************************/
/* Configuration ********************************************************************/
/* This RTC implementation supports only date/time RTC hardware */

#ifndef CONFIG_RTC_DATETIME
#  error "CONFIG_RTC_DATETIME must be set to use this driver"
#endif

#ifndef CONFIG_RTC_HIRES
#  error "CONFIG_RTC_HIRES must NOT be set with this driver"
#endif

/************************************************************************************
 * Private Types
 ************************************************************************************/

/************************************************************************************
 * Private Data
 ************************************************************************************/

/* Callback to use when the alarm expires */

#ifdef CONFIG_RTC_ALARM
static alarmcb_t g_alarmcb;
#endif

/************************************************************************************
 * Public Data
 ************************************************************************************/

/* g_rtc_enabled is set true after the RTC has successfully initialized */

volatile bool g_rtc_enabled = false;

/************************************************************************************
 * Private Functions
 ************************************************************************************/

/************************************************************************************
 * Name: stm32_rtc_interrupt
 *
 * Description:
 *    RTC interrupt service routine
 *
 * Input Parameters:
 *   irq - The IRQ number that generated the interrupt
 *   context - Architecture specific register save information.
 *
 * Returned Value:
 *   Zero (OK) on success; A negated errno value on failure.
 *
 ************************************************************************************/

#if CONFIG_RTC_ALARM
static int stm32_rtc_interrupt(int irq, void *context)
{
#warning "Missing logic"
  return OK;
}
#endif

/************************************************************************************
 * Public Functions
 ************************************************************************************/

/************************************************************************************
 * Name: up_rtcinitialize
 *
 * Description:
 *   Initialize the hardware RTC per the selected configuration.  This function is
 *   called once during the OS initialization sequence
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ************************************************************************************/

int up_rtcinitialize(void)
{
  /* Initialize the RTC */
#warning "Missing logic"

  /* Configure RTC interrupt to catch alarm interrupts. */

#ifdef CONFIG_RTC_ALARM
  irq_attach(STM32_IRQ_RTC, stm32_rtc_interrupt);
  up_enable_irq(STM32_IRQ_RTC);
#endif

  g_rtc_enabled = true;
  return OK;
}

/************************************************************************************
 * Name: up_rtc_getdatetime
 *
 * Description:
 *   Get the current date and time from the date/time RTC.  This interface
 *   is only supported by the date/time RTC hardware implementation.
 *   It is used to replace the system timer.  It is only used by the RTOS during
 *   intialization to set up the system time when CONFIG_RTC and CONFIG_RTC_DATETIME
 *   are selected (and CONFIG_RTC_HIRES is not).
 *
 *   NOTE: Some date/time RTC hardware is capability of sub-second accuracy.  That
 *   sub-second accuracy is lost in this interface.  However, since the system time
 *   is reinitialized on each power-up/reset, there will be no timing inaccuracy in
 *   the long run.
 *
 * Input Parameters:
 *   tp - The location to return the high resolution time value.
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ************************************************************************************/

int up_rtc_getdatetime(FAR const struct tm *tp)
{
#warning "Missing logic"
  return OK;
}

/************************************************************************************
 * Name: up_rtc_settime
 *
 * Description:
 *   Set the RTC to the provided time.  All RTC implementations must be able to
 *   set their time based on a standard timespec.
 *
 * Input Parameters:
 *   tp - the time to use
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ************************************************************************************/

int up_rtc_settime(FAR const struct timespec *tp)
{
  /* Break out the time values */
#warning "Missing logic"

  /* Then write the broken out values to the RTC */
#warning "Missing logic"

  return OK;
}

/************************************************************************************
 * Name: up_rtc_setalarm
 *
 * Description:
 *   Set up an alarm.
 *
 * Input Parameters:
 *   tp - the time to set the alarm
 *   callback - the function to call when the alarm expires.
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ************************************************************************************/

#ifdef CONFIG_RTC_ALARM
int up_rtc_setalarm(FAR const struct timespec *tp, alarmcb_t callback);
{
  irqstate_t flags;
  int ret = -EBUSY;

  /* Is there already something waiting on the ALARM? */

  if (g_alarmcb == NULL)
    {
      /* No.. Save the callback function pointer */

      g_alarmcb = callback;

      /* Break out the time values */
#warning "Missing logic"

      /* The set the alarm */
#warning "Missing logic"

      ret = OK;
    }
  return ret;
}
#endif

#endif /* CONFIG_RTC */