nuttx/arch/arm/src/stm32/stm32_rtc.h

/****************************************************************************
 * arch/arm/src/stm32/stm32_rtc.h
 *
 *   Copyright (C) 2011 Uros Platise. All rights reserved.
 *   Copyright (C) 2011-2013, 2015-2017 Gregory Nutt. All rights reserved.
 *   Author: Uros Platise <uros.platise@isotel.eu> (Original for the F1)
 *           Gregory Nutt <gnutt@nuttx.org> (On-going support and development)
 *
 * 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
 ****************************************************************************/

#ifndef __ARCH_ARM_SRC_STM32_STM32_RTC_H
#define __ARCH_ARM_SRC_STM32_STM32_RTC_H

#include <nuttx/config.h>

#include "chip.h"

/* The STM32 F1 has a simple battery-backed counter for its RTC and has a separate
 * block for the BKP registers.
 */

#if defined(CONFIG_STM32_STM32F10XX)
#  include "chip/stm32_rtc.h"
#  include "chip/stm32_bkp.h"

/* The other families use a more traditional Realtime Clock/Calendar (RTCC) with
 * broken-out data/time in BCD format.  The backup registers are integrated into
 * the RTCC in these families.
 */

#elif defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F20XX) || \
      defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F4XXX)
#  include "chip/stm32_rtcc.h"
#endif

/* Alarm function differs from part to part */

#if defined(CONFIG_STM32_STM32F4XXX)
#  include "stm32f40xxx_alarm.h"
#elif defined(CONFIG_STM32_STM32L15XX)
#  include "stm32l15xxx_alarm.h"
#else
#  include "stm32_alarm.h"
#endif

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#define STM32_RTC_PRESCALER_SECOND 32767    /* Default prescaler to get a
                                             * second base */
#define STM32_RTC_PRESCALER_MIN    1        /* Maximum speed of 16384 Hz */

#if defined(CONFIG_STM32_STM32F10XX)
/* RTC is only a counter, store RTC data in backup domain register DR1 (if
 * CONFIG_RTC_HIRES) and DR2 (state).
 */

#if !defined(CONFIG_RTC_MAGIC)
#  define CONFIG_RTC_MAGIC         (0xface) /* only 16 bit */
#endif

#define RTC_MAGIC_REG              STM32_BKP_DR2

#else /* !CONFIG_STM32_STM32F10XX */

#if !defined(CONFIG_RTC_MAGIC)
#  define CONFIG_RTC_MAGIC         (0xfacefeed)
#endif

#if !defined(CONFIG_RTC_MAGIC_REG)
#  define CONFIG_RTC_MAGIC_REG     (0)
#endif

#define RTC_MAGIC_REG              STM32_RTC_BKR(CONFIG_RTC_MAGIC_REG)

#endif /* CONFIG_STM32_STM32F10XX */

#define RTC_MAGIC                  CONFIG_RTC_MAGIC
#define RTC_MAGIC_TIME_SET         CONFIG_RTC_MAGIC_TIME_SET

#if !defined(CONFIG_RTC_MAGIC_TIME_SET)
#  define CONFIG_RTC_MAGIC_TIME_SET (CONFIG_RTC_MAGIC + 1)
#endif

/****************************************************************************
 * Public Types
 ****************************************************************************/

#ifndef __ASSEMBLY__

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

#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

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

/****************************************************************************
 * Name: stm32_rtc_irqinitialize
 *
 * Description:
 *   Initialize IRQs for RTC, not possible during up_rtc_initialize because
 *   up_irqinitialize is called later.
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ****************************************************************************/

int stm32_rtc_irqinitialize(void);

/****************************************************************************
 * Name: stm32_rtc_getdatetime_with_subseconds
 *
 * 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 initialization 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.
 *   Thatsub-second accuracy is returned through 'nsec'.
 *
 * Input Parameters:
 *   tp - The location to return the high resolution time value.
 *   nsec - The location to return the subsecond time value.
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ****************************************************************************/

#ifdef CONFIG_STM32_HAVE_RTC_SUBSECONDS
int stm32_rtc_getdatetime_with_subseconds(FAR struct tm *tp, FAR long *nsec);
#endif

/****************************************************************************
 * Name: stm32_rtc_setdatetime
 *
 * Description:
 *   Set the RTC to the provided time. RTC implementations which provide
 *   up_rtc_getdatetime() (CONFIG_RTC_DATETIME is selected) should provide
 *   this function.
 *
 * Input Parameters:
 *   tp - the time to use
 *
 * Returned Value:
 *   Zero (OK) on success; a negated errno on failure
 *
 ****************************************************************************/

#ifdef CONFIG_RTC_DATETIME
struct tm;
int stm32_rtc_setdatetime(FAR const struct tm *tp);
#endif

/****************************************************************************
 * Name: stm32_rtc_lowerhalf
 *
 * Description:
 *   Instantiate the RTC lower half driver for the STM32.  General usage:
 *
 *     #include <nuttx/timers/rtc.h>
 *     #include "stm32_rtc.h"
 *
 *     struct rtc_lowerhalf_s *lower;
 *     lower = stm32_rtc_lowerhalf();
 *     rtc_initialize(0, lower);
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   On success, a non-NULL RTC lower interface is returned.  NULL is
 *   returned on any failure.
 *
 ****************************************************************************/

#ifdef CONFIG_RTC_DRIVER
struct rtc_lowerhalf_s;
FAR struct rtc_lowerhalf_s *stm32_rtc_lowerhalf(void);
#endif

#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_STM32_STM32_RTC_H */