uint32_t HAL_RCC_GetPCLK1Freq(void)

这是一个函数声明，它属于HAL库中的RCC模块。该函数用于获取APB1总线的时钟频率。APB1总线是一种低速外设总线，用于连接一些不太需要高速数据传输的外设，例如串口、定时器等。在STM32系列的微控制器中，APB1总线的时钟频率通常是系统时钟频率的四分之一或者二分之一，具体取决于RCC_CFGR寄存器的设置。

相关问题

#include "main.h" #include "stdio.h" #include "string.h" #include "time.h" UART_HandleTypeDef huart1; void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_USART1_UART_Init(void); int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_USART1_UART_Init(); while (1) { time_t now = time(NULL); struct tm *timeinfo = localtime(&now); char time_str[9]; sprintf(time_str, "%02d:%02d:%02d", timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec); HAL_UART_Transmit(&huart1, (uint8_t *)time_str, strlen(time_str), HAL_MAX_DELAY); HAL_Delay(1000); } } void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** 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.HSEPredivValue = RCC_HSE_PREDIV_DIV1; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9; 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_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } static void MX_USART1_UART_Init(void) { huart1.Instance = USART1; huart1.Init.BaudRate = 115200; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart1) != HAL_OK) { Error_Handler(); } } static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOA_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, GPIO_PIN_RESET); /*Configure GPIO pin : PA9 */ GPIO_InitStruct.Pin = GPIO_PIN_9; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } 在以上代码的基础上，编写代码以实现计算发送 hh:mm:ss到单片机,修改单片机时间

可以使用串口接收单片机发送过来的时间数据，然后通过C语言中的time()函数来设置单片机的时间。下面是示例代码：

#include "main.h" 
#include "stdio.h" 
#include "string.h" 
#include "time.h" 

UART_HandleTypeDef huart1; 

void SystemClock_Config(void); 
static void MX_GPIO_Init(void); 
static void MX_USART1_UART_Init(void); 

int main(void) { 
  HAL_Init(); 
  SystemClock_Config(); 
  MX_GPIO_Init(); 
  MX_USART1_UART_Init(); 

  // 用于接收单片机发送过来的时间数据
  char time_input[9]; 

  while (1) { 
    // 接收串口数据
    HAL_UART_Receive(&huart1, (uint8_t *)time_input, 9, HAL_MAX_DELAY); 

    // 将接收到的时间数据转换成struct tm格式
    struct tm timeinfo = {0}; 
    sscanf(time_input, "%d:%d:%d", &timeinfo.tm_hour, &timeinfo.tm_min, &timeinfo.tm_sec); 

    // 设置单片机时间
    time_t now = mktime(&timeinfo); 
    if(now != -1) { 
      if(stm32_settime(now) == 0) { 
        printf("Time set successfully!\r\n"); 
      } 
      else { 
        printf("Failed to set time.\r\n"); 
      } 
    } 
    else { 
      printf("Invalid time data.\r\n"); 
    } 
  } 
} 

// 设置单片机时间
int stm32_settime(time_t t) { 
  struct tm *timeinfo = localtime(&t); 

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

  sTime.Hours = timeinfo->tm_hour; 
  sTime.Minutes = timeinfo->tm_min; 
  sTime.Seconds = timeinfo->tm_sec; 

  sDate.WeekDay = timeinfo->tm_wday; 
  sDate.Month = timeinfo->tm_mon + 1; 
  sDate.Date = timeinfo->tm_mday; 
  sDate.Year = timeinfo->tm_year - 100; 

  if(HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK) { 
    return -1; 
  } 

  if(HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN) != HAL_OK) { 
    return -1; 
  } 

  return 0; 
} 

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

  /** 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.HSEPredivValue = RCC_HSE_PREDIV_DIV1; 
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; 
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; 
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9; 
  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_DIV2; 
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { 
    Error_Handler(); 
  } 
} 

static void MX_USART1_UART_Init(void) { 
  huart1.Instance = USART1; 
  huart1.Init.BaudRate = 115200; 
  huart1.Init.WordLength = UART_WORDLENGTH_8B; 
  huart1.Init.StopBits = UART_STOPBITS_1; 
  huart1.Init.Parity = UART_PARITY_NONE; 
  huart1.Init.Mode = UART_MODE_TX_RX; 
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; 
  huart1.Init.OverSampling = UART_OVERSAMPLING_16; 
  if (HAL_UART_Init(&huart1) != HAL_OK) { 
    Error_Handler(); 
  } 
} 

static void MX_GPIO_Init(void) { 
  GPIO_InitTypeDef GPIO_InitStruct = {0}; 

  /* GPIO Ports Clock Enable */ 
  __HAL_RCC_GPIOA_CLK_ENABLE(); 

  /*Configure GPIO pin Output Level */ 
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, GPIO_PIN_RESET); 

  /*Configure GPIO pin : PA9 */ 
  GPIO_InitStruct.Pin = GPIO_PIN_9; 
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; 
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; 
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 
}

同时，需要在单片机上添加RTC实时时钟模块，并在CubeMX中进行配置。需要注意的是，使用RTC模块前需要先初始化时钟，可以使用RCC_OscConfig和RCC_ClkConfig函数来进行初始化。在设置时间时，需要将时间数据转换成RTC模块所需的格式，并调用HAL_RTC_SetTime和HAL_RTC_SetDate函数来设置时间和日期。

使用hal库实现TIM1_CH4触发ADC采样

以下是使用STM32 HAL库实现TIM1_CH4触发ADC采样的代码：

#include "stm32f4xx_hal.h"

ADC_HandleTypeDef hadc1;
TIM_HandleTypeDef htim1;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM1_Init(void);
static void MX_ADC1_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_TIM1_Init();
  MX_ADC1_Init();

  HAL_TIM_Base_Start(&htim1);
  HAL_ADC_Start(&hadc1);

  while (1)
  {
    HAL_TIM_GenerateEvent(&htim1, TIM_EVENT_TRIGGER_OC4);
    HAL_ADC_PollForConversion(&hadc1, 100); //等待ADC采样完成
    uint16_t adc_val = HAL_ADC_GetValue(&hadc1);
    //处理采样值
  }
}

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

  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  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_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  __HAL_RCC_ADC1_CLK_ENABLE();

  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC4;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_TIM1_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};

  __HAL_RCC_TIM1_CLK_ENABLE();

  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 0;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 65535;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }

  if (HAL_TIM_OC_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }

  sConfigOC.OCMode = TIM_OCMODE_TIMING;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
  sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
  if (HAL_TIM_OC_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
  {
    Error_Handler();
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC4REF;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }

}

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  __HAL_RCC_GPIOA_CLK_ENABLE();

  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void Error_Handler(void)
{
  while (1)
  {
  }
}

在上面的代码中，我们使用了TIM1_CH4作为ADC采样的外部触发源。首先，我们初始化了TIM1_CH4和ADC1，并启动了TIM1和ADC1。在主循环中，我们使用HAL_TIM_GenerateEvent函数触发TIM1_CH4输出，并使用HAL_ADC_PollForConversion函数等待ADC采样完成。最后，我们使用HAL_ADC_GetValue函数获取采样值并进行处理。需要注意的是，我们使用了HAL_ADC_Init函数的ExternalTrigConvEdge和ExternalTrigConv参数来设置ADC的触发源为TIM1_CH4。

同时，我们在MX_TIM1_Init函数中设置了TIM1_CH4的输出模式为TIM_OCMODE_TIMING，这意味着TIM1_CH4输出的脉冲宽度为0，只有上升沿触发ADC采样。我们还设置了TIM1_CH4的输出触发源为TRGO，这将使得TIM1_CH4的输出触发TIM1的更新事件，并将更新事件作为外部触发源，以触发ADC采样。

需要注意的是，上面的代码是基于STM32F4系列的，如果您使用的是其他型号的STM32芯片，代码可能会有所不同。