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rt-thread-official/bsp/stm32f20x/rtc.c

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/*
* File : rtc.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2009-01-05 Bernard the first version
*/
#include <rtthread.h>
#include <stm32f2xx.h>
#include <time.h>
__IO uint32_t AsynchPrediv = 0, SynchPrediv = 0;
RTC_TimeTypeDef RTC_TimeStructure;
RTC_InitTypeDef RTC_InitStructure;
RTC_AlarmTypeDef RTC_AlarmStructure;
RTC_DateTypeDef RTC_DateStructure;
#define MINUTE 60
#define HOUR (60*MINUTE)
#define DAY (24*HOUR)
#define YEAR (365*DAY)
static int month[12] =
{
0,
DAY*(31),
DAY*(31+29),
DAY*(31+29+31),
DAY*(31+29+31+30),
DAY*(31+29+31+30+31),
DAY*(31+29+31+30+31+30),
DAY*(31+29+31+30+31+30+31),
DAY*(31+29+31+30+31+30+31+31),
DAY*(31+29+31+30+31+30+31+31+30),
DAY*(31+29+31+30+31+30+31+31+30+31),
DAY*(31+29+31+30+31+30+31+31+30+31+30)
};
static struct rt_device rtc;
static time_t rt_mktime(struct tm *tm)
{
long res;
int year;
year = tm->tm_year - 70;
res = YEAR * year + DAY * ((year + 1) / 4);
res += month[tm->tm_mon];
if (tm->tm_mon > 1 && ((year + 2) % 4))
res -= DAY;
res += DAY * (tm->tm_mday - 1);
res += HOUR * tm->tm_hour;
res += MINUTE * tm->tm_min;
res += tm->tm_sec;
return res;
}
static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
{
if (dev->rx_indicate != RT_NULL)
{
/* Open Interrupt */
}
return RT_EOK;
}
static rt_size_t rt_rtc_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
return 0;
}
static rt_err_t rt_rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
time_t *time;
struct tm ti,*to;
RT_ASSERT(dev != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
time = (time_t *)args;
/* read device */
//RTC_GetTimeStamp(RTC_Format_BIN, &RTC_TimeStructure, &RTC_DateStructure);
RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure);
RTC_GetDate(RTC_Format_BIN, &RTC_DateStructure);
ti.tm_sec = RTC_TimeStructure.RTC_Seconds;
ti.tm_min = RTC_TimeStructure.RTC_Minutes;
ti.tm_hour = RTC_TimeStructure.RTC_Hours;
//ti.tm_wday = (RTC_DateStructure.RTC_WeekDay==7)?0:RTC_DateStructure.RTC_WeekDay;
ti.tm_mon = RTC_DateStructure.RTC_Month -1;
ti.tm_mday = RTC_DateStructure.RTC_Date;
ti.tm_year = RTC_DateStructure.RTC_Year + 70;
*time = rt_mktime(&ti);
//*time = RTC_GetCounter();
break;
case RT_DEVICE_CTRL_RTC_SET_TIME:
{
time = (time_t *)args;
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
/* Wait until last write operation on RTC registers has finished */
//RTC_WaitForLastTask();
/* Change the current time */
//RTC_SetCounter(*time);
to = localtime(time);
RTC_TimeStructure.RTC_Seconds = to->tm_sec;
RTC_TimeStructure.RTC_Minutes = to->tm_min;
RTC_TimeStructure.RTC_Hours = to->tm_hour;
//RTC_DateStructure.RTC_WeekDay =(ti->tm_wday==0)?7:ti->tm_wday;
RTC_DateStructure.RTC_Month = to->tm_mon + 1;
RTC_DateStructure.RTC_Date = to->tm_mday;
RTC_DateStructure.RTC_Year = to->tm_year - 70;
RTC_SetTime(RTC_Format_BIN, &RTC_TimeStructure);
RTC_SetDate(RTC_Format_BIN, &RTC_DateStructure);
/* Wait until last write operation on RTC registers has finished */
//RTC_WaitForLastTask();
RTC_WriteBackupRegister(RTC_BKP_DR1, 0xA5A5);
//BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);
}
break;
}
return RT_EOK;
}
/*******************************************************************************
* Function Name : RTC_Configuration
* Description : Configures the RTC.
* Input : None
* Output : None
* Return : 0 reday,-1 error.
*******************************************************************************/
int RTC_Config(void)
{
u32 count=0x200000;
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
RCC_LSEConfig(RCC_LSE_ON);
/* Wait till LSE is ready */
while ( (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) && (--count) );
if ( count == 0 )
{
return -1;
}
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
SynchPrediv = 0xFF;
AsynchPrediv = 0x7F;
/* Enable the RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro();
/* Enable The TimeStamp */
//RTC_TimeStampCmd(RTC_TimeStampEdge_Falling, ENABLE);
return 0;
}
int RTC_Configuration(void)
{
if(RTC_Config() < 0 )
return -1;
/* Set the Time */
RTC_TimeStructure.RTC_Hours = 0;
RTC_TimeStructure.RTC_Minutes = 0;
RTC_TimeStructure.RTC_Seconds = 0;
/* Set the Date */
RTC_DateStructure.RTC_Month = 1;
RTC_DateStructure.RTC_Date = 1;
RTC_DateStructure.RTC_Year = 0;
RTC_DateStructure.RTC_WeekDay = 4;
/* Calendar Configuration */
RTC_InitStructure.RTC_AsynchPrediv = AsynchPrediv;
RTC_InitStructure.RTC_SynchPrediv = SynchPrediv;
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
RTC_Init(&RTC_InitStructure);
/* Set Current Time and Date */
RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
RTC_SetDate(RTC_Format_BCD, &RTC_DateStructure);
if (RTC_Init(&RTC_InitStructure) == ERROR)
return -1;
return 0;
}
void rt_hw_rtc_init(void)
{
rtc.type = RT_Device_Class_RTC;
if (RTC_ReadBackupRegister(RTC_BKP_DR1) != 0xA5A5)
{
rt_kprintf("rtc is not configured\n");
rt_kprintf("please configure with set_date and set_time\n");
if ( RTC_Configuration() != 0)
{
rt_kprintf("rtc configure fail...\r\n");
return ;
}
}
else
{
/* Wait for RTC registers synchronization */
RTC_WaitForSynchro();
}
/* register rtc device */
rtc.init = RT_NULL;
rtc.open = rt_rtc_open;
rtc.close = RT_NULL;
rtc.read = rt_rtc_read;
rtc.write = RT_NULL;
rtc.control = rt_rtc_control;
/* no private */
rtc.user_data = RT_NULL;
rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
return;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
#include <time.h>
time_t time(time_t* t)
{
rt_device_t device;
time_t time;
device = rt_device_find("rtc");
if (device != RT_NULL)
{
rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
if (t != RT_NULL) *t = time;
}
return time;
}
void set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
{
time_t now;
struct tm* ti;
rt_device_t device;
ti = RT_NULL;
/* get current time */
time(&now);
ti = localtime(&now);
if (ti != RT_NULL)
{
ti->tm_year = year - 1900;
ti->tm_mon = month - 1; /* ti->tm_mon = month; */
ti->tm_mday = day;
}
now = mktime(ti);
device = rt_device_find("rtc");
if (device != RT_NULL)
{
rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
}
}
FINSH_FUNCTION_EXPORT(set_date, set date. e.g: set_date(2010,2,28))
void set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
{
time_t now;
struct tm* ti;
rt_device_t device;
ti = RT_NULL;
/* get current time */
time(&now);
ti = localtime(&now);
if (ti != RT_NULL)
{
ti->tm_hour = hour;
ti->tm_min = minute;
ti->tm_sec = second;
}
now = mktime(ti);
device = rt_device_find("rtc");
if (device != RT_NULL)
{
rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
}
}
FINSH_FUNCTION_EXPORT(set_time, set time. e.g: set_time(23,59,59))
void list_date()
{
time_t now;
time(&now);
rt_kprintf("%s\n", ctime(&now));
}
FINSH_FUNCTION_EXPORT(list_date, show date and time.)
#endif
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