129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
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/****************************************************************************
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* boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c
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*
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* Copyright (C) 2019 Alan Carvalho de Assis. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/timers/rtc.h>
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#include <nuttx/timers/ds3231.h>
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#include "stm32.h"
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#include "stm32_i2c.h"
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#include "stm32f4discovery.h"
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#if defined(CONFIG_I2C) && defined(CONFIG_RTC_DS1307)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define DS1307_I2C_ADDR 0x6f /* DS1307 I2C Address */
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#define DS1307_I2C_BUS 1 /* DS1307 is on I2C1 */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_ds1307_init
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*
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* Description:
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* Initialize and configure the DS1307 RTC
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*
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****************************************************************************/
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int stm32_ds1307_init(void)
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{
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FAR struct i2c_master_s *i2c;
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static bool initialized = false;
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int ret;
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/* Have we already initialized? */
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if (!initialized)
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{
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/* No.. Get the I2C bus driver */
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rtcinfo("Initialize I2C%d\n", DS1307_I2C_BUS);
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i2c = stm32_i2cbus_initialize(DS1307_I2C_BUS);
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if (!i2c)
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{
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rtcerr("ERROR: Failed to initialize I2C%d\n", DS1307_I2C_BUS);
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return -ENODEV;
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}
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/* Now bind the I2C interface to the DS1307 RTC driver */
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rtcinfo("Bind the DS1307 RTC driver to I2C%d\n", DS1307_I2C_BUS);
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ret = dsxxxx_rtc_initialize(i2c);
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if (ret < 0)
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{
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rtcerr("ERROR: Failed to bind I2C%d to the DS1307 RTC driver\n",
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DS1307_I2C_BUS);
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return -ENODEV;
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}
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#ifdef CONFIG_I2C_DRIVER
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/* Register the I2C to get the "nsh> i2c bus" command working */
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ret = i2c_register(i2c, DS1307_I2C_BUS);
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if (ret < 0)
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{
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rtcerr("ERROR: Failed to register I2C%d driver: %d\n", bus, ret);
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return -ENODEV;
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}
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#endif
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/* Synchronize the system time to the RTC time */
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clock_synchronize();
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/* Now we are initialized */
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initialized = true;
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}
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return OK;
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}
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#endif /* CONFIG_I2C && CONFIG_RTC_DS1307 */
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