GD32 RTC

1万 · 2021-6-3 16:11

部分GD32RTC只有一个存储寄存器，官方例程也只能存储时分秒，故此特别编写UTC时间，兼容上年月日周时分秒

---------------------------------------------------------------------------------------C---------------------------------------------------------------------------------------

#include "my_rtc.h"

const unsigned int NonleapYearMonth[12] = { 31, 31 + 28, 31 + 28 + 31, 31 + 28 + 31 + 30, 31 + 28 + 31 + 30 + 31, 31 + 28 + 31 + 30 + 31 + 30, 31 + 28 + 31 + 30 + 31 + 30 + 31, 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31, 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30, 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30, 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 };
const unsigned int LeapYearMonth[12] = { 31, 31 + 29, 31 + 29 + 31, 31 + 29 + 31 + 30, 31 + 29 + 31 + 30 + 31, 31 + 29 + 31 + 30 + 31 + 30, 31 + 29 + 31 + 30 + 31 + 30 + 31, 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31, 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30, 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30, 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 };

uint8_t my_rtc_cf(void)
{
if(bkp_data_read(BKP_DATA_0) != 0xA5A5)
return 0;
else
return 1;
}

1万 · 2021-6-3 16:11

void my_rtc_sync(void)
{
rcu_periph_clock_enable(RCU_BKPI);
rcu_periph_clock_enable(RCU_PMU);
pmu_backup_write_enable();

rtc_register_sync_wait();
rtc_lwoff_wait();
rcu_all_reset_flag_clear();
}

1万 · 2021-6-3 16:12

static unsigned char alg_IsLeapYear(unsigned int year)
{
if((year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0))) //能被4整除,不能被百整除,能被400整除。
{
return 1; //闰年
}
else
{
return 0; //平年
}
}

1万 · 2021-6-3 16:12

my_timejg alg_Utc2LocalTime(unsigned int UtcVal, char TimeZone)
{
unsigned int i = 0;
my_timejg LocalTime;
unsigned int Hour,Days,Year;

LocalTime.my_seconds = UtcVal%60;                      //得到秒余数
LocalTime.my_minutes = (UtcVal/60)%60;             //得到整数分钟数

Hour = (UtcVal/60)/60;                                     //得到整数小时数
LocalTime.my_hour = Hour%24+TimeZone;          //得到小时余数+时区
if(LocalTime.my_hour>23)
{
      LocalTime.my_hour-=24;
      Days=Hour/24+1;
}
else
{
      Days=Hour/24;
}
LocalTime.my_week=(Days+4)%7;                         //计算星期,0-表示星期天       注：1970-1-1 是星期4

                                                //注：400年=146097天,100年=36524天,4年=1461天
Year = 1970;                                                          //utc时间从1970开始
Year += (Days/146097)*400;

Days %= 146097;                                                       //计算400年内的剩余天数
Year += (Days/36525)*100;

Days %= 36525;
Year += (Days/1461)*4;

Days %= 1461;                                                          //计算4年内剩余天数,1970平1972闰年
while( Days > 365)
{
      if(alg_IsLeapYear(Year))
      {
         Days--;
      }
      Days -= 365;
      Year++;
}
if (!alg_IsLeapYear(Year) && (Days == 365) )
{
      Year++;
      LocalTime.my_day =1;
      LocalTime.my_month =1;
      LocalTime.my_years =Year;
      return LocalTime;
}
LocalTime.my_years =Year;
LocalTime.my_month=0;
LocalTime.my_day=0;
if (alg_IsLeapYear(Year))                                  //本年是闰年
{
      for (i = 0; i < 12; i++)
      {
         if (Days < LeapYearMonth[i])
         {
            LocalTime.my_month = i + 1;
            if (i == 0)
            {
                  LocalTime.my_day = Days;
            }
            else
            {
                  LocalTime.my_day = Days - LeapYearMonth[i - 1];
            }
            LocalTime.my_day++;
            return LocalTime;
         }
      }
}
else                                                                         //本年是平年
{
      for (i = 0; i < 12; i++)
      {
         if (Days < NonleapYearMonth[i])
         {
            LocalTime.my_month  = i + 1;
            if (i == 0)
            {
                  LocalTime.my_day = Days;
            }
            else
            {
                  LocalTime.my_day = Days - NonleapYearMonth[i - 1];
            }
            LocalTime.my_day++;
            return LocalTime;
         }
      }
}
return LocalTime;
}

1万 · 2021-6-3 16:12

unsigned int  alg_LocalTime2Utc(my_timejg LocalTime, char TimeZone)
{
unsigned int y = LocalTime.my_years -1970;                         //看一下有几个400年,几个100年,几个4年
unsigned int dy = (y / 400);
unsigned int days = dy *  (400 * 365 + 97);                      //400年的天数

dy = (y % 400) / 100;
days += dy * (100 * 365 + 25);                                     //100年的天数

dy = (y % 100) / 4;
days += dy * (4 * 365 + 1);                                              //4年的天数

dy = y % 4;                                                                               //注意:这里1972是闰年,与1970只差2年
days += dy * 365 ;

if(dy == 3)                                                                               //这个4年里,有没有闰年就差1天
{
      days++; //只有这个是要手动加天数的,因为1973年计算时前面的天数按365天算,1972少算了一天
}

if (LocalTime.my_month != 1)
{
      if(alg_IsLeapYear(LocalTime.my_years))                                              //看看今年是闰年还是平年
      {
         days += LeapYearMonth[(LocalTime.my_month - 1) - 1];
      }
      else
      {
         days += NonleapYearMonth[(LocalTime.my_month  - 1) - 1];       //如果给定的月份数为x则,只有x-1个整数月
      }
}
days += LocalTime.my_day - 1;

return (days * 24 * 3600 + ((unsigned int)LocalTime.my_hour - TimeZone)* 3600 + (unsigned int)LocalTime.my_minutes * 60 + (unsigned int)LocalTime.my_seconds);
}

1万 · 2021-6-3 16:13

void my_time_adjust(my_timejg time)
{
rtc_lwoff_wait();
rtc_counter_set(alg_LocalTime2Utc(time,8));
rtc_lwoff_wait();

      //PMU 时钟打开
      rcu_periph_clock_enable(RCU_BKPI);
      rcu_periph_clock_enable(RCU_PMU);
      //备份域写使能
      pmu_backup_write_enable();
      //向备份域写入标记
      bkp_data_write(BKP_DATA_0, 0xA5A5);
      //备份域写失能
      pmu_backup_write_disable();
}

1万 · 2021-6-3 16:13

void my_time_read(my_timejg *time)
{
*time=alg_Utc2LocalTime(rtc_counter_get(),8);
}

1万 · 2021-6-3 16:13

//重置备份域
static void bkp_deinit(void)
{
/* reset BKP domain register*/
rcu_bkp_reset_enable();
rcu_bkp_reset_disable();
}

1万 · 2021-6-3 16:13

void my_rtc_init(void)
{
//PMU 时钟打开
rcu_periph_clock_enable(RCU_BKPI);
rcu_periph_clock_enable(RCU_PMU);
//备份域写使能和重置
pmu_backup_write_enable();
bkp_deinit();
//使能外部32.768晶振
rcu_osci_on(RCU_LXTAL);
//等待外部时钟稳定
rcu_osci_stab_wait(RCU_LXTAL);
//选择外部32.768时钟给RTC供给
rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);
//使能RTC时钟
rcu_periph_clock_enable(RCU_RTC);
//等待RTC注册同步
rtc_register_sync_wait();
//等待RTC写完数据
rtc_lwoff_wait();
//设置RTC分频器:设置RTC周期为1秒
rtc_prescaler_set(32767);
//等待RTC写完数据
rtc_lwoff_wait();
}

1万 · 2021-6-3 16:14

---------------------------------------------------------------------------------------H---------------------------------------------------------------------------------------

#ifndef __MY_RTC__
#define __MY_RTC__

#include "gd32f20x_rtc.h"
#include "gd32f20x_bkp.h"
#include "gd32f20x_rcu.h"
#include "gd32f20x_pmu.h"
#include "stdint.h"

//时间信息结构体
typedef struct
{
unsigned char    my_seconds;
unsigned char    my_minutes;
unsigned char    my_hour;
unsigned char    my_day;
unsigned char    my_month;
  unsigned char    my_week;
unsigned int    my_years;
}my_timejg;

//设置时间
void my_time_adjust(my_timejg time);
//获取时间
void my_time_read(my_timejg *time);
//UTC时间转换
my_timejg alg_Utc2LocalTime(unsigned int UtcVal, char TimeZone);
//转换为UTC时间
unsigned int  alg_LocalTime2Utc(my_timejg LocalTime, char TimeZone);
//同步时间
void my_rtc_sync(void);
//查询是否设置过时间
uint8_t my_rtc_cf(void);

#endif