drv_rtc.c

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date         Author      Notes
 * 2018-12-04   balanceTWK        change to new framework
 */

#include "board.h"

#ifdef BSP_USING_ONCHIP_RTC

//#define DRV_DEBUG
#define LOG_TAG             "drv.rtc"
#include <drv_log.h>

#define BKUP_REG_DATA 0xA5A5

static struct rt_device rtc;

static RTC_HandleTypeDef RTC_Handler;

static time_t get_rtc_timestamp(void)
{
    RTC_TimeTypeDef RTC_TimeStruct = {0};
    RTC_DateTypeDef RTC_DateStruct = {0};
    struct tm tm_new;

    HAL_RTC_GetTime(&RTC_Handler, &RTC_TimeStruct, RTC_FORMAT_BIN);
    HAL_RTC_GetDate(&RTC_Handler, &RTC_DateStruct, RTC_FORMAT_BIN);

    tm_new.tm_sec  = RTC_TimeStruct.Seconds;
    tm_new.tm_min  = RTC_TimeStruct.Minutes;
    tm_new.tm_hour = RTC_TimeStruct.Hours;
    tm_new.tm_mday = RTC_DateStruct.Date;
    tm_new.tm_mon  = RTC_DateStruct.Month - 1;
    tm_new.tm_year = RTC_DateStruct.Year + 100;

    LOG_D("get rtc time.");
    return mktime(&tm_new);
}

static rt_err_t set_rtc_time_stamp(time_t time_stamp)
{
    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
    RTC_TimeTypeDef RTC_TimeStruct = {0};
    RTC_DateTypeDef RTC_DateStruct = {0};
    struct tm *p_tm;

    HAL_PWR_EnableBkUpAccess();
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);

    p_tm = localtime(&time_stamp);
    if (p_tm->tm_year < 100)
    {
        return -RT_ERROR;
    }

    RTC_TimeStruct.Seconds = p_tm->tm_sec ;
    RTC_TimeStruct.Minutes = p_tm->tm_min ;
    RTC_TimeStruct.Hours   = p_tm->tm_hour;
    RTC_DateStruct.Date    = p_tm->tm_mday;
    RTC_DateStruct.Month   = p_tm->tm_mon + 1 ;
    RTC_DateStruct.Year    = p_tm->tm_year - 100;
    RTC_DateStruct.WeekDay = p_tm->tm_wday + 1;

    if(HAL_RTC_SetTime(&RTC_Handler, &RTC_TimeStruct, RTC_FORMAT_BIN) != HAL_OK)
    {
        return -RT_ERROR;
    }
    if(HAL_RTC_SetDate(&RTC_Handler, &RTC_DateStruct, RTC_FORMAT_BIN) != HAL_OK)
    {
        return -RT_ERROR;
    }

    LOG_D("set rtc time.");
    HAL_RTCEx_BKUPWrite(&RTC_Handler, RTC_BKP_DR1, BKUP_REG_DATA);
    return RT_EOK;
}

static void rt_rtc_init(void)
{
    __HAL_RCC_PWR_CLK_ENABLE();

    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    RCC_OscInitStruct.LSEState = RCC_LSE_ON;
    HAL_RCC_OscConfig(&RCC_OscInitStruct);
}

static rt_err_t rt_rtc_config(struct rt_device *dev)
{
    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};

    HAL_PWR_EnableBkUpAccess();
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);

    RTC_Handler.Instance = RTC;
    if (HAL_RTCEx_BKUPRead(&RTC_Handler, RTC_BKP_DR1) != BKUP_REG_DATA)
    {
        LOG_W("RTC hasn't been configured, please use <date> command to config.");

#if defined(SOC_SERIES_STM32F1)
        RTC_Handler.Init.OutPut = RTC_OUTPUTSOURCE_NONE;
        RTC_Handler.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
#elif defined(SOC_SERIES_STM32F0) || defined(SOC_SERIES_STM32F4) || defined(SOC_SERIES_STM32F7) || defined(SOC_SERIES_STM32L4)
        RTC_Handler.Init.AsynchPrediv = 0X7F;
#ifndef SOC_SERIES_STM32F0
        RTC_Handler.Init.SynchPrediv = 0XFF;
#else
        RTC_Handler.Init.SynchPrediv = 0x0130;
#endif
        RTC_Handler.Init.HourFormat = RTC_HOURFORMAT_24;
        RTC_Handler.Init.OutPut = RTC_OUTPUT_DISABLE;
        RTC_Handler.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
        RTC_Handler.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
#endif
        if (HAL_RTC_Init(&RTC_Handler) != HAL_OK)
        {
            return -RT_ERROR;
        }
    }
    return RT_EOK;
}

static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
{
    rt_err_t result = RT_EOK;
    RT_ASSERT(dev != RT_NULL);
    switch (cmd)
    {
    case RT_DEVICE_CTRL_RTC_GET_TIME:
        *(rt_uint32_t *)args = get_rtc_timestamp();
        LOG_D("RTC: get rtc_time %x\n", *(rt_uint32_t *)args);
        break;

    case RT_DEVICE_CTRL_RTC_SET_TIME:
        if(set_rtc_time_stamp(*(rt_uint32_t *)args))
        {
            result = -RT_ERROR;
        }
        LOG_D("RTC: set rtc_time %x\n", *(rt_uint32_t *)args);
        break;
    }

    return result;
}

#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops rtc_ops = 
{
    RT_NULL,
    RT_NULL,
    RT_NULL,
    RT_NULL,
    RT_NULL,
    rt_rtc_control
};
#endif

static rt_err_t rt_hw_rtc_register(rt_device_t device, const char *name, rt_uint32_t flag)
{
    RT_ASSERT(device != RT_NULL);

    rt_rtc_init();
    if (rt_rtc_config(device) != RT_EOK)
    {
        return -RT_ERROR;
    }
#ifdef RT_USING_DEVICE_OPS
    device->ops         = &rtc_ops;
#else
    device->init        = RT_NULL;
    device->open        = RT_NULL;
    device->close       = RT_NULL;
    device->read        = RT_NULL;
    device->write       = RT_NULL;
    device->control     = rt_rtc_control;
#endif
    device->type        = RT_Device_Class_RTC;
    device->rx_indicate = RT_NULL;
    device->tx_complete = RT_NULL;
    device->user_data   = RT_NULL;

    /* register a character device */
    return rt_device_register(device, name, flag);
}

int rt_hw_rtc_init(void)
{
    rt_err_t result;
    result = rt_hw_rtc_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
    if (result != RT_EOK)
    {
        LOG_E("rtc register err code: %d", result);
        return result;
    }
    LOG_D("rtc init success");
    return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_rtc_init);

#endif /* BSP_USING_ONCHIP_RTC */