forked from xuos/xiuos
wgz-code
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/****************************************************************************
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* boards/arm/stm32/aiit-arm32-board/src/stm32_ds1307.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 "aiit-arm32-board.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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