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在开发板的例程中，配有RTC计时的程序，将它与前面介绍的OLED屏相配合可轻松实现一个RTC电子时钟。 RTC例程的功能是先读取RTC开始计时，在5秒后再按重新设置的时间来计时，其运行效果如图1和图2所示。 图1 读取RTC时间 图2 设置新时间并计时 图3 OLED屏显示RTC 实现图3所示计时效果的主程序为： - int main(void)
- {
- S_RTC_TIME_DATA_T sInitTime, sReadRTC;
- uint32_t u32Sec;
- uint8_t u8IsNewDateTime = 0;
- /* Init System, peripheral clock and multi-function I/O */
- SYS_Init();
- /* Init UART for printf */
- UART_Init();
- GPIO_SetMode(PB, BIT14, GPIO_MODE_OUTPUT);
- GPIO_SetMode(PC, BIT1, GPIO_MODE_OUTPUT);
- GPIO_SetMode(PC, BIT0, GPIO_MODE_OUTPUT);
- GPIO_SetMode(PH, BIT4, GPIO_MODE_INPUT);
- PB14 = 1;
- OLED_Init();
- OLED_Clear();
- OLED_ShowString(0,0,"M471 RTC",16);
- OLED_ShowString(0,2,"OLED DISPLAY",16);
- TIMER_Delay(TIMER0, 2000000);
- OLED_Clear();
- /* Enable RTC NVIC */
- NVIC_EnableIRQ(RTC_IRQn);
- /* Open RTC and start counting */
- sInitTime.u32Year = 2021;
- sInitTime.u32Month =8;
- sInitTime.u32Day = 13;
- sInitTime.u32Hour = 12;
- sInitTime.u32Minute = 30;
- sInitTime.u32Second = 0;
- sInitTime.u32DayOfWeek = 5;
- sInitTime.u32TimeScale = RTC_CLOCK_24;
- RTC_Open(&sInitTime);
- /* Enable RTC tick interrupt, one RTC tick is 1 second */
- RTC_EnableInt(RTC_INTEN_TICKIEN_Msk);
- RTC_SetTickPeriod(RTC_TICK_1_SEC);
- /* Use PA.2 to check tick period time */
- PA->MODE = (PA->MODE & ~GPIO_MODE_MODE2_Msk) | (GPIO_MODE_OUTPUT << GPIO_MODE_MODE2_Pos);
- PA2 = 1;
- u32Sec = 0;
- g_u32RTCTInt = 0;
- OLED_ShowString(0,0,"00:00:00",16);
- while(1)
- {
- if(g_u32RTCTInt == 1)
- {
- g_u32RTCTInt = 0;
- /* Read current RTC date/time */
- RTC_GetDateAndTime(&sReadRTC);
- OLED_ShowNum(0,0,sReadRTC.u32Hour,2,16);
- OLED_ShowNum(24,0,sReadRTC.u32Minute,2,16);
- OLED_ShowNum(48,0,sReadRTC.u32Second,2,16);
- if(u32Sec == sReadRTC.u32Second)
- {
- while(1) {}
- }
- u32Sec = sReadRTC.u32Second;
- if(u8IsNewDateTime == 0)
- {
- if(u32Sec == (sInitTime.u32Second + 5))
- {
- u8IsNewDateTime = 1;
- RTC_SetDate(2021, 7, 30, RTC_FRIDAY);
- RTC_SetTime(11, 12, 13, RTC_CLOCK_24, RTC_AM);
- }
- }
- }
- }
- }
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