stm32hal rtc

STM32HAL RTC是一种实时时钟，它可以在STM32芯片上提供时间和日期信息。在STM32HAL库中，RTC相关的函数和头文件可以在stm32f4xx_hal_rtc.c和stm32f4xx_hal_rtc.h中找到。其中，可以使用HAL_RTC_Init()函数来初始化RTC，使用HAL_RTC_SetTime()和HAL_RTC_SetDate()函数来设置时间和日期，使用HAL_RTC_GetTime()和HAL_RTC_GetDate()函数来获取时间和日期。此外，还可以使用HAL_RTCEx_BKUPRead()和HAL_RTCEx_BKUPWrite()函数来读取和写入备份寄存器。

以下是一个简单的示例代码，演示如何使用STM32HAL RTC：

#include "stm32f4xx_hal.h"

RTC_HandleTypeDef hrtc;

void SystemClock_Config(void);
static void MX_RTC_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_RTC_Init();

  RTC_TimeTypeDef sTime;
  RTC_DateTypeDef sDate;

  // 设置时间为12:34:56
  sTime.Hours = 12;
  sTime.Minutes = 34;
  sTime.Seconds = 56;
  HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN);

  // 设置日期为2022年3月4日
  sDate.Year = 22;
  sDate.Month = RTC_MONTH_MARCH;
  sDate.Date = 4;
  HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN);

  // 获取当前时间和日期
  HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
  HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);

  // 输出当前时间和日期
  printf("Current time: %02d:%02d:%02d\r\n", sTime.Hours, sTime.Minutes, sTime.Seconds);
  printf("Current date: %02d-%02d-%02d\r\n", sDate.Date, sDate.Month, sDate.Year);

  while (1)
  {
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK |
                                RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_RTC_Init(void)
{
  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.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  if (HAL_RTC_Init(&hrtc) != HAL_OK)
  {
    Error_Handler();
  }
}