基于STM32F413的实时时钟

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jinglixixi 提问时间：2016-12-18 10:50 /

由于STM32F413（STM32官网）的内部集成有RTC,，这就为实时时钟的制作通过了方便，我们只需在配套的RTC例程基础上为其添加相应的显示器件即可。

从成本及方便性考虑，为它配置一个IIC接口的双色OLED屏是最经济的，下图即为其使用效果。

显示效果图

那OLED屏与STM32F413是如何连接的呢？

你只需找到板上印有AVDD、GND、PA5、PA6的引脚，如何将OLED屏的引脚插到板子上即可，怎么样很简单吧，你不需要进行任何的连线处理。

主程序则应改为如下的内容：

int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure LED2 */
BSP_LED_Init(LED2);
/* Configure the system clock to 100 MHz */
SystemClock_Config();
Lcd_Init();
OLED_ShowString(2,0,"STM32F413-RTC",16);
OLED_ShowString(2,2,"Nucleo-144",16);
OLED_ShowString(2,4,"1.5MB Flash",16);
OLED_ShowString(2,6,"320-KB SRAM",16);
delay_ms(1000);
OLED_Clear();
OLED_ShowString(2,0,"STM32F413-RTC",16);
while(1);
/*##-1- Configure the RTC peripheral #######################################*/
/* Configure RTC prescaler and RTC data registers */
/* RTC configured as follow:
- Hour Format = Format 24
- Asynch Prediv = Value according to source clock
- Synch Prediv = Value according to source clock
- OutPut = Output Disable
- OutPutPolarity = High Polarity
- OutPutType = Open Drain
*/
RtcHandle.Instance = RTC;
RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RtcHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
RtcHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
if(HAL_RTC_Init(&RtcHandle) != HAL_OK)
{
/* Error */
Error_Handler();
}
/*##-2- Check if Data stored in BackUp register0: No Need to reconfigure RTC#*/
/* Read the BackUp Register 0 Data */
if(HAL_RTCEx_BKUPRead(&RtcHandle, RTC_BKP_DR0) != 0x32F2)
{
/* Configure RTC Calendar */
RTC_CalendarConfig();
}
/* Infinite loop */
while (1)
{
/*##-3- Display the updated Time and Date ################################*/
RTC_CalendarShow(aShowTime, aShowDate);
}
}

复制代码

其实还有一个地方是最需要修改的，那就是RTC_CalendarShow（）函数，其修改后的内容如下:

static void RTC_CalendarShow(uint8_t *showtime, uint8_t *showdate)
{
RTC_DateTypeDef sdatestructureget;
RTC_TimeTypeDef stimestructureget;
/* Get the RTC current Time */
HAL_RTC_GetTime(&RtcHandle, &stimestructureget, RTC_FORMAT_BIN);
/* Get the RTC current Date */
HAL_RTC_GetDate(&RtcHandle, &sdatestructureget, RTC_FORMAT_BIN);
OLED_ShowString(2,2," ",16);
OLED_ShowString(2,4," ",16);
OLED_ShowNum(4,2,2000 + sdatestructureget.Year,4,16);
OLED_ShowChar(36,2,':',16);
OLED_ShowNum(44,2,sdatestructureget.Month,2,16);
OLED_ShowChar(60,2,':',16);
OLED_ShowNum(68,2,sdatestructureget.Date,2,16);
OLED_ShowNum(20,4,stimestructureget.Hours,2,16);
OLED_ShowChar(36,4,':',16);
OLED_ShowNum(44,4,stimestructureget.Minutes,2,16);
OLED_ShowChar(60,4,':',16);
OLED_ShowNum(68,4,stimestructureget.Seconds,2,16);
#ifdef DISPLAY_ON_DUBUGGER
/* Display time Format: hh:mm:ss */
sprintf((char*)showtime,"%02d:%02d:%02d",stimestructureget.Hours, stimestructureget.Minutes, stimestructureget.Seconds);
/* Display date Format: mm-dd-yy */
sprintf((char*)showdate,"%02d-%02d-%02d",sdatestructureget.Month, sdatestructureget.Date, 2000 + sdatestructureget.Year);
#endif
}