[Xiaohua HC32F448 Review] +RTC electronic clock

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[Xiaohua HC32F448 Review] +RTC electronic clock [Copy link]

 

The HC32F448 is equipped with an RTC timer. This is a standard RTC, not some chips launched by manufacturers that claim to have RTC but are fake. It can only be called a quasi-RTC and the calendar function must be implemented through software.

Therefore, the function of an electronic clock can be easily realized by using the RTC on the chip. The effect of testing with the serial port is shown in Figure 1.

Figure 1 RTC test results

The function to set the RTC is:

static void RTC_CalendarConfig(void)
{
    stc_rtc_date_tstcRtcDate;
    stc_rtc_time_tstcRtcTime;
    stcRtcDate.u8Year    = 23U;
    stcRtcDate.u8Month   = RTC_MONTH_JULY;
    stcRtcDate.u8Day     = 28U;
    stcRtcDate.u8Weekday = RTC_WEEKDAY_WEDNESDAY;
    stcRtcTime.u8Hour   = 23U;
    stcRtcTime.u8Minute = 59U;
    stcRtcTime.u8Second = 55U;
    stcRtcTime.u8AmPm   = RTC_HOUR_12H_AM;
    if (LL_OK != RTC_SetDate(RTC_DATA_FMT_DEC, &stcRtcDate)) {
         DDL_Printf("Set Date failed!\r\n");
    }
    if (LL_OK != RTC_SetTime(RTC_DATA_FMT_DEC, &stcRtcTime)) {
         DDL_Printf("Set Time failed!\r\n");
    }
}

By cooperating with the OLED screen introduced above, the function of electronic clock can be realized. The main program is:

int32_t main(void)
{
    stc_rtc_date_tstcCurrentDate;
    stc_rtc_time_tstcCurrentTime;
    LL_PERIPH_WE(EXAMPLE_PERIPH_WE);
    BSP_CLK_Init();
    BSP_IO_Init();
    BSP_LED_Init();
	LED_Init();
    OLED_Init();
	OLED_Clear();
	OLED_ShowString(20,0,"HC32F448",16);
	OLED_ShowString(20,2,"RTC & OLED",16);
	OLED_ShowString(20,4,"  :  :",16);
	OLED_ShowString(20,6,"  -  -",16);
    DDL_PrintfInit(BSP_PRINTF_DEVICE, BSP_PRINTF_BAUDRATE, BSP_PRINTF_Preinit);
    RTC_Config();
    LL_PERIPH_WP(EXAMPLE_PERIPH_WP);
    for (;;)
    {
        if (1U == u8SecIntFlag) 
        {
             u8SecIntFlag = 0U;
             BSP_LED_Toggle(LED_RED);
             if (LL_OK == RTC_GetDate(RTC_DATA_FMT_DEC, &stcCurrentDate)) 
             {
                 if (LL_OK == RTC_GetTime(RTC_DATA_FMT_DEC, &stcCurrentTime)) 
                 {
					OLED_ShowNum(20,4,stcCurrentTime.u8Hour,2,16);
					OLED_ShowNum(44,4,stcCurrentTime.u8Minute,2,16);
					OLED_ShowNum(68,4,stcCurrentTime.u8Second,2,16);
					OLED_ShowNum(20,6,stcCurrentDate.u8Year,2,16);
					OLED_ShowNum(44,6,stcCurrentDate.u8Month,2,16);
					OLED_ShowNum(68,6,stcCurrentDate.u8Day,2,16);
                 } else {
                     DDL_Printf("Get time failed!\r\n");
                 }
              } else {
                     DDL_Printf("Get date failed!\r\n");
              }
        }
    }
}

After the program is compiled and downloaded, the test results are shown in Figure 2, indicating that the function is correct.

Figure 2 Electronic clock effect