nuttx/boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c

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/****************************************************************************
* boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c
*
* Copyright (C) 2019 Alan Carvalho de Assis. All rights reserved.
* Author: Alan Carvalho de Assis <acassis@gmail.com>
*
* 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 <errno.h>
#include <debug.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/timers/rtc.h>
#include <nuttx/timers/ds3231.h>
#include "stm32.h"
#include "stm32_i2c.h"
#include "stm32f4discovery.h"
#if defined(CONFIG_I2C) && defined(CONFIG_RTC_DS1307)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define DS1307_I2C_ADDR 0x6f /* DS1307 I2C Address */
#define DS1307_I2C_BUS 1 /* DS1307 is on I2C1 */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_ds1307_init
*
* Description:
* Initialize and configure the DS1307 RTC
*
****************************************************************************/
int stm32_ds1307_init(void)
{
FAR struct i2c_master_s *i2c;
static bool initialized = false;
int ret;
/* Have we already initialized? */
if (!initialized)
{
/* No.. Get the I2C bus driver */
rtcinfo("Initialize I2C%d\n", DS1307_I2C_BUS);
i2c = stm32_i2cbus_initialize(DS1307_I2C_BUS);
if (!i2c)
{
rtcerr("ERROR: Failed to initialize I2C%d\n", DS1307_I2C_BUS);
return -ENODEV;
}
/* Now bind the I2C interface to the DS1307 RTC driver */
rtcinfo("Bind the DS1307 RTC driver to I2C%d\n", DS1307_I2C_BUS);
ret = dsxxxx_rtc_initialize(i2c);
if (ret < 0)
{
rtcerr("ERROR: Failed to bind I2C%d to the DS1307 RTC driver\n",
DS1307_I2C_BUS);
return -ENODEV;
}
#ifdef CONFIG_I2C_DRIVER
/* Register the I2C to get the "nsh> i2c bus" command working */
ret = i2c_register(i2c, DS1307_I2C_BUS);
if (ret < 0)
{
rtcerr("ERROR: Failed to register I2C%d driver: %d\n", bus, ret);
return -ENODEV;
}
#endif
/* Synchronize the system time to the RTC time */
clock_synchronize();
/* Now we are initialized */
initialized = true;
}
return OK;
}
#endif /* CONFIG_I2C && CONFIG_RTC_DS1307 */