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/*
* Copyright (C) 2018 Shanghai Eastsoft Microelectronics Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-10-23 yuzrain the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <string.h>
#include "board.h"
#include "drv_rtc.h"
#ifdef RT_USING_RTC
/**
* @brief Time structure
*/
typedef struct
{
uint8_t hour; /**< Hours */
uint8_t minute; /**< Minutes */
uint8_t second; /**< Seconds */
uint16_t sub_sec; /**< Sub-seconds */
} rtc_time_t;
/**
* @brief Date structure
*/
typedef struct
{
uint8_t week; /**< Weeks */
uint8_t day; /**< days */
uint8_t month; /**< months */
uint8_t year; /**< years */
} rtc_date_t;
static rt_uint32_t bcd_to_dec(rt_uint32_t bcd)
{
return ((bcd & 0xF) + ((bcd >> 4) & 0xF) * 10);
}
static void rtc_get_time(rtc_time_t *time)
{
rt_uint32_t tmp = RTC->TIME;
time->second = bcd_to_dec(tmp & 0x7F);
time->minute = bcd_to_dec((tmp >> 8) & 0x7F);
time->hour = bcd_to_dec((tmp >> 16) & 0x7F);
return;
}
static void rtc_get_date(rtc_date_t *date)
{
uint32_t tmp = RTC->CAL;
date->day = bcd_to_dec(tmp & 0x3F);
date->month = bcd_to_dec((tmp >> 8) & 0x1F);
date->year = bcd_to_dec((tmp >> 16) & 0xFF);
date->week = bcd_to_dec((RTC->TIME >> 24) & 0x7);
return;
}
static rt_err_t es32f0_rtc_control(rt_device_t dev, int cmd, void *args)
{
rt_err_t result = RT_EOK;
struct tm time_temp;
struct tm *pNow;
rt_uint16_t timout = 0xFFF;
rtc_time_t *time = rt_malloc(sizeof(rtc_time_t));
rtc_date_t *date = rt_malloc(sizeof(rtc_date_t));
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
{
/* Wait RTC data ready then read */
while ((--timout)&&((RTC->STAT & RTC_STAT_SYNDONE_MSK) != RTC_STAT_SYNDONE_MSK));
if (timout == 0)
result = RT_ERROR;
/* Read */
rtc_get_time(time);
rtc_get_date(date);
time_temp.tm_sec = time->second;
time_temp.tm_min = time->minute;
time_temp.tm_hour = time->hour;
time_temp.tm_wday = date->week - 1;
time_temp.tm_mday = date->day;
time_temp.tm_mon = date->month - 1;
time_temp.tm_year = date->year - 1900 + 2000;
*((time_t *)args) = mktime(&time_temp);
break;
}
case RT_DEVICE_CTRL_RTC_SET_TIME:
{
rt_enter_critical();
/* converts calendar time time into local time. */
pNow = localtime((const time_t *)args);
/* copy the statically located variable */
memcpy(&time_temp, pNow, sizeof(struct tm));
/* unlock scheduler. */
rt_exit_critical();
time->hour = time_temp.tm_hour;
time->minute = time_temp.tm_min;
time->second = time_temp.tm_sec;
date->year = time_temp.tm_year + 1900 - 2000;
date->month = time_temp.tm_mon + 1;
date->day = time_temp.tm_mday;
/* Stop RTC */
CLEAR_BIT(RTC->CON, RTC_CON_RTCEN_MSK);
WRITE_REG(RTC->TIME, ((time->hour/10)<<RTC_TIME_HOUR_T_POSS) /* hour */
|((time->hour%10)<<RTC_TIME_HOUR_U_POSS)
|((time->minute/10)<<RTC_TIME_MIN_T_POSS) /* minute */
|((time->minute%10)<<RTC_TIME_MIN_U_POSS)
|((time->second/10)<<RTC_TIME_SEC_T_POSS) /* second */
|((time->second%10)<<RTC_TIME_SEC_U_POSS));
WRITE_REG(RTC->CAL, ((date->year/10)<<RTC_CAL_YEAR_T_POSS) /* year */
|((date->year%10)<<RTC_CAL_YEAR_U_POSS)
|((date->month/10)<<RTC_CAL_MON_T_POS) /* month */
|((date->month%10)<<RTC_CAL_MON_U_POSS)
|((date->day/10)<<RTC_CAL_DATE_T_POSS) /* date */
|((date->day%10)<<RTC_CAL_DATE_U_POSS));
/* start RTC */
SET_BIT(RTC->CON, RTC_CON_RTCEN_MSK);
break;
}
case RT_DEVICE_CTRL_RTC_GET_ALARM:
break;
case RT_DEVICE_CTRL_RTC_SET_ALARM:
break;
default:
break;
}
rt_free(time);
rt_free(date);
return result;
}
#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops es32f0_rtc_ops =
{
RT_NULL,
RT_NULL,
RT_NULL,
RT_NULL,
RT_NULL,
es32f0_rtc_control
};
#endif
static struct rt_device rtc_dev;
#define RTC_SOURCE_LOSC 0x1
#define RTC_SOURCE_LRC 0x2
int rt_hw_rtc_init(void)
{
rt_err_t ret = RT_EOK;
rt_uint16_t timout = 0xFFFF;
rt_uint32_t rtc_clk = 32768-1;
rt_uint8_t rtc_src = RTC_SOURCE_LOSC;
/*
* Config RTC clock
* We config the external 32.768K crystal as RTC clock source for the first
* choice. If external 32.768K crystal is not ready, we will choose LRC.
*/
/* Enable LOSC then wait it ready */
if ((RCU->CON & RCU_CON_LOSCON_MSK) != RCU_CON_LOSCON_MSK)
SET_BIT(RCU->CON, RCU_CON_LOSCON_MSK);
/* Wait external 32.768K crystal ready */
while (((RCU->CON & RCU_CON_LOSCRDY_MSK) != RCU_CON_LOSCRDY_MSK)&&(--timout));
if (timout == 0)
{
/* We use LRC if external 32.768K crystal is not ready */
if ((RCU->CON & RCU_CON_LRCON_MSK) != RCU_CON_LRCON_MSK)
SET_BIT(RCU->CON, RCU_CON_LRCON_MSK);
/* Wait LRC ready */
timout = 0xFF;
while (((RCU->CON & RCU_CON_LRCRDY_MSK) != RCU_CON_LRCRDY_MSK)&&(--timout));
rtc_clk = 32000-1;
rtc_src = RTC_SOURCE_LRC;
}
/* Open RTC clock */
SET_BIT(RCU->AHBEN, RCU_AHBEN_RTCEN_MSK);
/* Reset RTC */
SET_BIT(RCU->AHBRST, RCU_AHBRST_RTCEN_MSK);
CLEAR_BIT(RCU->AHBRST, RCU_AHBRST_RTCEN_MSK);
CLEAR_BIT(RTC->CON, RTC_CON_RTCEN_MSK);
/* Config RTC clock source */
MODIFY_REG(RTC->CON, RTC_CON_CKSEL_MSK, rtc_src<<RTC_CON_CKSEL_POSS);
MODIFY_REG(RTC->CON, RTC_CON_PSCALE_MSK|RTC_CON_SCALE_MSK,
((rtc_clk&0x7F)<<RTC_CON_PSCALE_POSS)|
(((rtc_clk>>7)&0xFF)<<RTC_CON_SCALE_POSS));
/* Set default time - Wed Oct 30 08:00:00 2019 */
WRITE_REG(RTC->TIME, (0x3<<RTC_TIME_WEEK_POSS) /* week */
|(0x0<<RTC_TIME_HOUR_T_POSS) /* hour */
|(0x8<<RTC_TIME_HOUR_U_POSS)
|(0x0<<RTC_TIME_MIN_T_POSS) /* minute */
|(0x0<<RTC_TIME_MIN_U_POSS)
|(0x0<<RTC_TIME_SEC_T_POSS) /* second */
|(0x0<<RTC_TIME_SEC_U_POSS));
WRITE_REG(RTC->CAL, (0x1<<RTC_CAL_YEAR_T_POSS) /* year */
|(0x9<<RTC_CAL_YEAR_U_POSS)
|(0x1<<RTC_CAL_MON_T_POS) /* month */
|(0x0<<RTC_CAL_MON_U_POSS)
|(0x3<<RTC_CAL_DATE_T_POSS) /* date */
|(0x0<<RTC_CAL_DATE_U_POSS));
/* RTC start */
SET_BIT(RTC->CON, RTC_CON_RTCEN_MSK);
rtc_dev.type = RT_Device_Class_RTC;
rtc_dev.rx_indicate = RT_NULL;
rtc_dev.tx_complete = RT_NULL;
#ifdef RT_USING_DEVICE_OPS
rtc_dev.ops = &es32f0_rtc_ops;
#else
rtc_dev.init = RT_NULL;
rtc_dev.open = RT_NULL;
rtc_dev.close = RT_NULL;
rtc_dev.read = RT_NULL;
rtc_dev.write = RT_NULL;
rtc_dev.control = es32f0_rtc_control;
#endif
rtc_dev.user_data = RTC;
ret = rt_device_register(&rtc_dev, "rtc", RT_DEVICE_FLAG_RDWR);
return ret;
}
INIT_DEVICE_EXPORT(rt_hw_rtc_init);
#endif
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