【NuMaker-M471测评】RTC电子时钟

只看该作者 · 2021-8-15 09:16

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：

复制

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);

}

}

}

}

}