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/*
* File : stm32f4_rtc.c
* This file is stm32f4 rtc driver 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
* 2015-09-29 FlyM the first version.
*/
#include <time.h>
#include <rtthread.h>
#include <stm32f4xx.h>
#include "stm32f4_rtc.h"
static int get_week(int year, int month, int day)
{
if (month==1||month==2)
{
year -=1;
month +=12;
}
return (day+1+2*month+3*(month+1)/5+year+(year/4)-year/100+year/400)%7;
}
static struct rt_device rtc;
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, int cmd, void *args)
{
rt_time_t *time;
RT_ASSERT(dev != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
{
struct tm ct;
RTC_TimeTypeDef t;
RTC_DateTypeDef d;
rt_memset(&ct,0,sizeof(struct tm));
time = (rt_time_t *)args;
/* read device */
RTC_GetDate(RTC_Format_BIN,&d);
RTC_GetTime(RTC_Format_BIN,&t);
ct.tm_year = d.RTC_Year + 100;
ct.tm_mon = d.RTC_Month - 1;
ct.tm_mday = d.RTC_Date;
ct.tm_wday = d.RTC_WeekDay;
ct.tm_hour = t.RTC_Hours;
ct.tm_min = t.RTC_Minutes;
ct.tm_sec = t.RTC_Seconds;
*time = mktime(&ct);
}
break;
case RT_DEVICE_CTRL_RTC_SET_TIME:
{
struct tm *ct;
struct tm tm_new;
time_t *time;
RTC_TimeTypeDef RTC_TimeStructure;
RTC_InitTypeDef RTC_InitStructure;
RTC_DateTypeDef RTC_DateStructure;
time = (time_t *)args;
/* lock scheduler. */
rt_enter_critical();
/* converts calendar time time into local time. */
ct = localtime(time);
/* copy the statically located variable */
rt_memcpy(&tm_new, ct, sizeof(struct tm));
/* unlock scheduler. */
rt_exit_critical();
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
/* ck_spre(1Hz) = RTCCLK(LSI) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)*/
//uwSynchPrediv = 0xFF;
//uwAsynchPrediv = 0x7F;
/* Configure the RTC data register and RTC prescaler */
RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
RTC_InitStructure.RTC_SynchPrediv = 0xFF;
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
RTC_Init(&RTC_InitStructure);
/* Set the date */
RTC_DateStructure.RTC_Year = tm_new.tm_year - 100;
RTC_DateStructure.RTC_Month = tm_new.tm_mon + 1;
RTC_DateStructure.RTC_Date = tm_new.tm_mday;
RTC_DateStructure.RTC_WeekDay = get_week(tm_new.tm_year+1900,tm_new.tm_mon+1,tm_new.tm_mday);
RTC_SetDate(RTC_Format_BIN, &RTC_DateStructure);
/* Set the time*/
if (tm_new.tm_hour > 11)
{
RTC_TimeStructure.RTC_H12 = RTC_H12_PM;
}
else
{
RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
}
RTC_TimeStructure.RTC_Hours = tm_new.tm_hour;
RTC_TimeStructure.RTC_Minutes = tm_new.tm_min;
RTC_TimeStructure.RTC_Seconds = tm_new.tm_sec;
RTC_SetTime(RTC_Format_BIN, &RTC_TimeStructure);
/* Indicator for the RTC configuration */
RTC_WriteBackupRegister(RTC_BKP_DR0, 0x32F2);
}
break;
}
return RT_EOK;
}
/*******************************************************************************
* Function Name : RTC_Configuration
* Description : Configures the RTC.
* Input : None
* Output : None
* Return : 0 reday,-1 error.
*******************************************************************************/
int RTC_Configuration(void)
{
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
#if defined (RTC_CLOCK_SOURCE_LSI) /* LSI used as RTC source clock*/
/* The RTC Clock may varies due to LSI frequency dispersion */
/* Enable the LSI OSC */
RCC_LSICmd(ENABLE);
/* Wait till LSI is ready */
while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
{
}
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
/* ck_spre(1Hz) = RTCCLK(LSI) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)*/
//uwSynchPrediv = 0xFF;
//uwAsynchPrediv = 0x7F;
#elif defined (RTC_CLOCK_SOURCE_LSE) /* LSE used as RTC source clock */
/* Enable the LSE OSC */
RCC_LSEConfig(RCC_LSE_ON);
/* Wait till LSE is ready */
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{
}
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
#else
#error Please select the RTC Clock source inside the main.c file
#endif /* RTC_CLOCK_SOURCE_LSI */
/* Enable the RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro();
return 0;
}
void rt_hw_rtc_init(void)
{
rtc.type = RT_Device_Class_RTC;
if (RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x32F2)
{
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"
void show_time(void)
{
RTC_TimeTypeDef t;
RTC_DateTypeDef d;
/* Get the current Date */
RTC_GetDate(RTC_Format_BIN,&d);
/* Get the current Time */
RTC_GetTime(RTC_Format_BIN, &t);
/* Display time Format : hh:mm:ss */
rt_kprintf("Now Time = 20%02d %02d %02d[%02d]-%0.2d:%0.2d:%0.2d \r\n", \
d.RTC_Year,d.RTC_Month,d.RTC_Date,d.RTC_WeekDay,t.RTC_Hours, t.RTC_Minutes, t.RTC_Seconds);
}
FINSH_FUNCTION_EXPORT(show_time, show current time.)
#endif
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