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【WCH】CH32F203基于内部RTC时钟+SSD1306 OLED显示

• 📌相关篇《STM32F103基于标准库+I2C SSD1306仿数码管RTC时钟显示》

• ✨CH32F203的内部时钟频率：40KHz

• 🔖基于Keil开发环境

• 📜基于SDK中的RTC示例修改为内部时钟源，串口打印：
  

• 🌼I2C SSD1306 OLED显示
  

⛳RTC内部时钟源修改注意事项

1. RTC内部时钟源的频率为40KHz。
   

🛠RTC内部时钟源代码修改

/*********************************************************************
 * @fn      RTC_Init
 *
 * @brief   Initializes RTC collection.
 *
 * @return  1 - Init Fail
 *          0 - Init Success
 */
u8 RTC_Init(void)
{
    u8 temp = 0;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
    PWR_BackupAccessCmd(ENABLE);

    /* Is it the first configuration */

    BKP_DeInit();
	RCC_LSICmd(ENABLE  );//内部时钟使能
//    RCC_LSEConfig(RCC_LSE_ON);//外部时钟
// while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET && temp < 250)//外部
    while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET && temp < 250)//内部
    {
        temp++;
        Delay_Ms(20);
    }
    if(temp >= 250)
    {
        return 1;
    }
     RCC_RTCCLKConfig( RCC_RTCCLKSource_LSI );//选择内部时钟源
     RCC_RTCCLKCmd( ENABLE );
     RTC_WaitForLastTask();
     RTC_WaitForSynchro();
     //		RTC_ITConfig(RTC_IT_ALR, ENABLE);
     RTC_ITConfig( RTC_IT_SEC, ENABLE );
     RTC_WaitForLastTask();
     RTC_EnterConfigMode();
		RTC_SetPrescaler( 40000-1 );//内部40KHz
//     RTC_SetPrescaler( 32767 );//外部32768HZ
     RTC_WaitForLastTask();
     RTC_Set( 2023, 4, 25, 16, 58, 55 );       /* Setup Time */
     RTC_ExitConfigMode();
     BKP_WriteBackupRegister( BKP_DR1, 0XA1A1 );//这里和STM32不一样不是0x5050
    RTC_NVIC_Config();
    RTC_Get();

    return 0;
}

• 🌿RTC.C

#include "RTC.h"
#include "ch32f20x_rtc.h"
#include "ch32f20x_bkp.h"
#include "ch32f20x_pwr.h"


_calendar_obj calendar;

u8 const table_week[12] = {0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5};
const u8 mon_table[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

/* Exported_Functions */


/*********************************************************************
 * @fn      RTC_NVIC_Config
 *
 * @brief   Initializes RTC Int.
 *
 * @return  none
 */
static void RTC_NVIC_Config(void)
{
    NVIC_InitTypeDef NVIC_InitStructure = {0};
    NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

/*********************************************************************
 * @fn      RTC_Init
 *
 * @brief   Initializes RTC collection.
 *
 * @return  1 - Init Fail
 *          0 - Init Success
 */
u8 RTC_Init(void)
{
    u8 temp = 0;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
    PWR_BackupAccessCmd(ENABLE);

    /* Is it the first configuration */

    BKP_DeInit();
	RCC_LSICmd(ENABLE  );
//    RCC_LSEConfig(RCC_LSE_ON);
    while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET && temp < 250)
    {
        temp++;
        Delay_Ms(20);
    }
    if(temp >= 250)
    {
        return 1;
    }
     RCC_RTCCLKConfig( RCC_RTCCLKSource_LSI );//仅修改了此处
     RCC_RTCCLKCmd( ENABLE );
     RTC_WaitForLastTask();
     RTC_WaitForSynchro();
     //		RTC_ITConfig(RTC_IT_ALR, ENABLE);
     RTC_ITConfig( RTC_IT_SEC, ENABLE );
     RTC_WaitForLastTask();
     RTC_EnterConfigMode();
		RTC_SetPrescaler( 40000-1 );//内部40KHz
//     RTC_SetPrescaler( 32767 );//外部32768HZ
     RTC_WaitForLastTask();
     RTC_Set( 2023, 4, 25, 16, 58, 55 );       /* Setup Time */
     RTC_ExitConfigMode();
     BKP_WriteBackupRegister( BKP_DR1, 0XA1A1 );

    RTC_NVIC_Config();
    RTC_Get();

    return 0;
}


/*********************************************************************
 * @fn      Is_Leap_Year
 *
 * @brief   Judging whether it is a leap year.
 *
 * @param   year
 *
 * @return  1 - Yes
 *          0 - No
 */
u8 Is_Leap_Year(u16 year)
{
    if(year % 4 == 0)
    {
        if(year % 100 == 0)
        {
            if(year % 400 == 0)
            {
                return 1;
            }
            else
            {
                return 0;
            }
        }
        else
        {
            return 1;
        }
    }
    else
    {
        return 0;
    }
}

/*********************************************************************
 * @fn      RTC_Set
 *
 * @brief   Set Time.
 *
 * @param   Struct of _calendar_obj
 *
 * @return  1 - error
 *          0 - success
 */
u8 RTC_Set(u16 syear, u8 smon, u8 sday, u8 hour, u8 min, u8 sec)
{
    u16 t;
    u32 seccount = 0;
    if(syear < 1970 || syear > 2099)
    {
        return 1;
    }
    for(t = 1970; t < syear; t++)
    {
        if(Is_Leap_Year(t))
        {
            seccount += 31622400;
        }
        else
        {
            seccount += 31536000;
        }
    }
    smon -= 1;
    for(t = 0; t < smon; t++)
    {
        seccount += (u32)mon_table[t] * 86400;
        if(Is_Leap_Year(syear) && t == 1)
        {
            seccount += 86400;
        }
    }
    seccount += (u32)(sday - 1) * 86400;
    seccount += (u32)hour * 3600;
    seccount += (u32)min * 60;
    seccount += sec;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
    PWR_BackupAccessCmd(ENABLE);
    RTC_SetCounter(seccount);
    RTC_WaitForLastTask();
    return 0;
}

/*********************************************************************
 * @fn      RTC_Alarm_Set
 *
 * @brief   Set Alarm Time.
 *
 * @param   Struct of _calendar_obj
 *
 * @return  1 - error
 *          0 - success
 */
u8 RTC_Alarm_Set(u16 syear, u8 smon, u8 sday, u8 hour, u8 min, u8 sec)
{
    u16 t;
    u32 seccount = 0;
    if(syear < 1970 || syear > 2099)
    {
        return 1;
    }
    for(t = 1970; t < syear; t++)
    {
        if(Is_Leap_Year(t))
        {
            seccount += 31622400;
        }
        else
        {
            seccount += 31536000;
        }
    }
    smon -= 1;
    for(t = 0; t < smon; t++)
    {
        seccount += (u32)mon_table[t] * 86400;
        if(Is_Leap_Year(syear) && t == 1)
        {
            seccount += 86400;
        }
    }
    seccount += (u32)(sday - 1) * 86400;
    seccount += (u32)hour * 3600;
    seccount += (u32)min * 60;
    seccount += sec;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
    PWR_BackupAccessCmd(ENABLE);
    RTC_SetAlarm(seccount);
    RTC_WaitForLastTask();

    return 0;
}

/*********************************************************************
 * @fn      RTC_Get
 *
 * @brief   Get current time.
 *
 * @return  1 - error
 *          0 - success
 */
u8 RTC_Get(void)
{
    static u16 daycnt = 0;
    u32 timecount = 0;
    u32 temp = 0;
    u16 temp1 = 0;
    timecount = RTC_GetCounter();
    temp = timecount / 86400;
    if(daycnt != temp)
    {
        daycnt = temp;
        temp1 = 1970;
        while(temp >= 365)
        {
            if(Is_Leap_Year(temp1))
            {
                if(temp >= 366)
                {
                    temp -= 366;
                }
                else
                {
                    temp1++;
                    break;
                }
            }
            else
            {
                temp -= 365;
            }
            temp1++;
        }
        calendar.w_year = temp1;
        temp1 = 0;
        while(temp >= 28)
        {
            if(Is_Leap_Year(calendar.w_year) && temp1 == 1)
            {
                if(temp >= 29)
                {
                    temp -= 29;
                }
                else
                {
                    break;
                }
            }
            else
            {
                if(temp >= mon_table[temp1])
                {
                    temp -= mon_table[temp1];
                }
                else
                {
                    break;
                }
            }
            temp1++;
        }
        calendar.w_month = temp1 + 1;
        calendar.w_date = temp + 1;
    }
    temp = timecount % 86400;
    calendar.hour = temp / 3600;
    calendar.min = (temp % 3600) / 60;
    calendar.sec = (temp % 3600) % 60;
    calendar.week = RTC_Get_Week(calendar.w_year, calendar.w_month, calendar.w_date);
    return 0;
}


/*********************************************************************
 * @fn      RTC_Get_Week
 *
 * @brief   Get the current day of the week.
 *
 * @param   year/month/day
 *
 * @return  week
 */
u8 RTC_Get_Week(u16 year, u8 month, u8 day)
{
    u16 temp2;
    u8 yearH, yearL;

    yearH = year / 100;
    yearL = year % 100;
    if(yearH > 19)
    {
        yearL += 100;
    }
    temp2 = yearL + yearL / 4;
    temp2 = temp2 % 7;
    temp2 = temp2 + day + table_week[month - 1];
    if(yearL % 4 == 0 && month < 3)
    {
        temp2--;
    }
    return(temp2 % 7);
}
/*********************************************************************
 * @fn      RTC_IRQHandler
 *
 * @brief   This function handles RTC Handler.
 *
 * @return  none
 */
void RTC_IRQHandler( void )
{
    if( RTC_GetITStatus( RTC_IT_SEC ) != RESET ) /* Seconds interrupt */
    {
        RTC_Get();
    }
    if( RTC_GetITStatus( RTC_IT_ALR ) != RESET ) /* Alarm clock interrupt */
    {
        RTC_ClearITPendingBit( RTC_IT_ALR );
        RTC_Get();
    }

    RTC_ClearITPendingBit( RTC_IT_SEC | RTC_IT_OW );
    RTC_WaitForLastTask();
}

• 🌿RTC.H

#ifndef __RTC_H
#define __RTC_H	

#include "debug.h"

typedef struct
{
    vu8 hour;
    vu8 min;
    vu8 sec;

    vu16 w_year;
    vu8  w_month;
    vu8  w_date;
    vu8  week;
} _calendar_obj;

extern _calendar_obj calendar;
extern u8 const mon_table[12];	//月份日期数据表

u8 RTC_Init( void );
u8 Is_Leap_Year( u16 year );
u8 RTC_Alarm_Set( u16 syear, u8 smon, u8 sday, u8 hour, u8 min, u8 sec );
u8 RTC_Get( void );
u8 RTC_Get_Week( u16 year, u8 month, u8 day );
u8 RTC_Set( u16 syear, u8 smon, u8 sday, u8 hour, u8 min, u8 sec );


#endif

• main.c

/********************************** (C) COPYRIGHT *******************************
* File Name          : main.c
* Author             : WCH
* Version            : V1.0.0
* Date               : 2021/08/08
* Description        : Main program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for 
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/

/*
 *@Note
 Calendar routine:
 This routine demonstrates that the initial time is 13:58:55 on October 8, 2019, real-time timing, 
 every 1S through the serial port print the real-time clock value.

*/

#include "debug.h"
#include "RTC.h" 
/* Global define */


/* Global Variable */


/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    NVIC_PriorityGroupConfig( NVIC_PriorityGroup_2 );
    Delay_Init();
    USART_Printf_Init( 115200 );
    printf( "SystemClk:%d
", SystemCoreClock );
    printf( "RTC Test
" );
    if(RTC_Init()==0)
		{
			printf("Init Fail 
");
		}else printf("Init Success 
");

    while( 1 )
    {
        Delay_Ms( 1000 );
        printf( "year/month/day/week/hour/min/sec:
" );
        printf( "%d-%d-%d  %d  %d:%d:%d
", calendar.w_year, calendar.w_month, calendar.w_date,
                calendar.week, calendar.hour, calendar.min, calendar.sec );
    }
}

• 🌿基于内部时钟源,串口打印RTC时间源码

链接: https://pan.baidu.com/s/1affWjahgxh9seB-9bcxF8g
提取码: chiw

• 🌿基于STM32移植到CH32F203TC时钟+I2C SSD1306 OLED显示程序

链接: https://pan.baidu.com/s/1gMHbHdmvWhQqolOjeaLuZg
提取码: w9gc