[原创] ST NUCLEO-C031C6开发板学习笔记07（RTC实时时钟）

qzc0927 2024-3-5 16:53 楼主

## 10：RTC实时时钟

### 10.1：硬件设计

查看芯片数据手册：

![image-20240305164030046](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305164030046.png)

原理图设计：

![image-20240305164123838](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305164123838.png)

### 10.2：软件设计

1：CubeMX设置

![image-20240305164300057](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305164300057.png)

![image-20240305164336164](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305164336164.png)

2：代码编写

RTC初始化：

```C
RTC_HandleTypeDef hrtc;

/* RTC init function */
void MX_RTC_Init(void)
{

/* USER CODE BEGIN RTC_Init 0 */

/* USER CODE END RTC_Init 0 */

RTC_TimeTypeDef sTime = {0};
RTC_DateTypeDef sDate = {0};

/* USER CODE BEGIN RTC_Init 1 */

/* USER CODE END RTC_Init 1 */

/** Initialize RTC Only
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
hrtc.Init.OutPutPullUp = RTC_OUTPUT_PULLUP_NONE;
if (HAL_RTC_Init(&hrtc) != HAL_OK)
{
  Error_Handler();
}

/* USER CODE BEGIN Check_RTC_BKUP */

/* USER CODE END Check_RTC_BKUP */

/** Initialize RTC and set the Time and Date
*/
sTime.Hours = 0x16;
sTime.Minutes = 0x18;
sTime.Seconds = 0x55;
sTime.SubSeconds = 0x0;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
{
  Error_Handler();
}
sDate.WeekDay = RTC_WEEKDAY_TUESDAY;
sDate.Month = RTC_MONTH_MARCH;
sDate.Date = 0x5;
sDate.Year = 0x0;

if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
{
  Error_Handler();
}
/* USER CODE BEGIN RTC_Init 2 */

/* USER CODE END RTC_Init 2 */

}
```

RTC实时时钟显示函数：

```C
static void RTC_CalendarShow(uint8_t *showtime, uint8_t *showdate)
{
  RTC_DateTypeDef sdatestructureget;
  RTC_TimeTypeDef stimestructureget;

/* Get the RTC current Time */
  HAL_RTC_GetTime(&hrtc, &stimestructureget, RTC_FORMAT_BIN);
  /* Get the RTC current Date */
  HAL_RTC_GetDate(&hrtc, &sdatestructureget, RTC_FORMAT_BIN);
  /* Display time Format : hh:mm:ss */
  sprintf((char *)showtime, "%2d:%2d:%2d", stimestructureget.Hours, stimestructureget.Minutes, stimestructureget.Seconds);
  /* Display date Format : mm-dd-yyyy */
  sprintf((char *)showdate, "%2d-%2d-%2d", sdatestructureget.Month, sdatestructureget.Date, 2024 + sdatestructureget.Year);
    
    DEBUG_LOG("%s %s",showdate,showtime);

}
```

### 10.3：RTC单元测试

打开串口调试助手：

![image-20240305165136508](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305165136508.png)

![image-20240305165216353](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305165216353.png)