如何使用Nucleo-F303K8每1us进行adc转换？

如何解决如何使用Nucleo-F303K8每1us进行adc转换？

我正在使用STM32 Cube IDE。我现在尝试的是在TIM2中启用MSM，并在通道1上启用output_compare_no_output，然后选择“重置”作为触发事件。然后，我进入ADC1并启用Regular_Conversion_Mode，将Number_Of_Conversions设置为1，并将External_Trigger_Conversion_Source设置为Timer 2 Trigger Out事件。之后，我以循环模式设置了DMA，将半字压入RAM缓冲区。为了进行测试，我将计时器的频率设置得低得多（10Hz），并在ConvHalfCoplt和ConvCoplt完整回调中通过UART从缓冲区发送一些ADC读数。但是目前它不起作用。您能考虑我的做法中的任何错误吗？

#include "main.h"

#include <stdio.h>
#include <string.h>

#define ADC_BUF_LEN 4096
ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;

DAC_HandleTypeDef hdac1;
DMA_HandleTypeDef hdma_dac1_ch1;

TIM_HandleTypeDef htim2;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

uint8_t adc_buf[ADC_BUF_LEN];
char msg[16];

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_ADC1_Init(void);
static void MX_DAC1_Init(void);
static void MX_TIM2_Init(void);

/* Private user code ---------------------------------------------------------*/

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals,Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART2_UART_Init();
  MX_ADC1_Init();
  MX_DAC1_Init();
  MX_TIM2_Init();
  /* USER CODE BEGIN 2 */

  HAL_TIM_Base_Start(&htim2);
  HAL_ADC_Start_DMA(&hadc1,(uint32_t*) adc_buf,ADC_BUF_LEN);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  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.PLLMUL = RCC_PLL_MUL4;
  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_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct,FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC12;
  PeriphClkInit.Adc12ClockSelection = RCC_ADC12PLLCLK_DIV16;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief ADC1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_ADC1_Init(void)
{
  ADC_MultiModeTypeDef multimode = {0};
  ADC_ChannelConfTypeDef sConfig = {0};

  /** Common config
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = ADC_SCAN_disABLE;
  hadc1.Init.ContinuousConvMode = disABLE;
  hadc1.Init.discontinuousConvMode = disABLE;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_TRGO;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrofConversion = 1;
  hadc1.Init.DMAContinuousRequests = disABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = disABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the ADC multi-mode
  */
  multimode.Mode = ADC_MODE_INDEPENDENT;
  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1,&multimode) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1,&sConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief DAC1 Initialization Function
  * @param None
  * @retval None
  */

/**
  * @brief TIM2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM2_Init(void)
{

  /* USER CODE BEGIN TIM2_Init 0 */

  /* USER CODE END TIM2_Init 0 */

  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};

  /* USER CODE BEGIN TIM2_Init 1 */

  /* USER CODE END TIM2_Init 1 */
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 800 - 1;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 1000 - 1;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_disABLE;
  if (HAL_TIM_OC_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2,&sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_TIMING;
  sConfigOC.pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_disABLE;
  if (HAL_TIM_OC_ConfigChannel(&htim2,&sConfigOC,TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM2_Init 2 */

  /* USER CODE END TIM2_Init 2 */

}

/**
  * @brief USART2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.Baudrate = 38400;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_disABLE;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_Init 2 */

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn,0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
  /* DMA1_Channel3_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel3_IRQn,0);
  HAL_NVIC_EnableIRQ(DMA1_Channel3_IRQn);

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

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

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB,GPIO_PIN_3,GPIO_PIN_RESET);

  /*Configure GPIO pin : PB3 */
  GPIO_InitStruct.Pin = GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_nopULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB,&GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

// Called when first half of buffer is filled
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc){
  HAL_GPIO_WritePin(GPIOB,GPIO_PIN_SET);
  sprintf(msg,"%ho\r\n",adc_buf[0]);
  HAL_UART_Transmit(&huart2,(uint8_t*) msg,strlen(msg),HAL_MAX_DELAY);
}
// Called when buffer is completely filled
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc){
  HAL_GPIO_WritePin(GPIOB,GPIO_PIN_RESET);
  sprintf(msg,adc_buf[ADC_BUF_LEN / 2]);
  HAL_UART_Transmit(&huart2,HAL_MAX_DELAY);
}

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */

  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_Failed(uint8_t *file,uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,tex: printf("Wrong parameters value: file %s on line %d\r\n",file,line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

############################################# ############################## 旧： ############################################### ############################

到目前为止，我尝试将TIM2配置为每微秒重置一次并在interupt回调中启动转换：

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
  // Check which timer triggered this callback
  if (htim == &htim2){
    HAL_ADC_Start(&hadc1);
    HAL_ADC_PollForConversion(&hadc1,HAL_MAX_DELAY);
    adc_val = HAL_ADC_GetValue(&hadc1);
  }
}

但是据我所知PollForConversion可能需要一些时间。

创建缓冲区并使用DMA不断将数据从ADC传输到缓冲区并每微秒从那里读取一个值是否更好？我不会这样读取“旧”数据吗？

解决方法

每1us运行一次ADC转换是一项艰巨的任务，因为STM32F3 MCU内核的最大运行速度为。 72MHz“仅”。因此，您应该仅使用硬件功能来解决此任务：

设置一个计时器，以每1us创建一次触发输出事件（请参见《参考手册》的 TIM控制寄存器中的主模式选择说明）。定时器可以在更新事件上生成触发输出，而不是生成中断：

MSM

TIM2_SMCR位应保持为0
将ADC设置为在由计时器生成的外部触发器触发时运行转换（请参见《参考手册》 ADC章节中的外部触发器的转换）：
- 在EXTEN中将01设置为ADC1_CFGR（在上升沿触发硬件）
- 在EXTSEL中将1011设置为ADC1_CFGR（TIM2_TRGO事件）
将ADC设置为在每次转换后生成DMA请求（请参见《参考手册》 ADC章节中的使用DMA管理转换）
设置DMA，以将从ADC读取的数据存储到RAM缓冲区中（请参阅参考手册中有关DMA控制器的章节）。我建议在较大的RAM缓冲区上以循环模式运行DMA通道。这样避免了在运行时重新配置DMA的任何必要。

使用此设置，您可以在此设置中使用所有MCU时钟周期来处理ADC生成的大量数据（1 MByte / s）。您可以轮询DMA控制器以检查是否有新数据，也可以使用DMA标志 Half Transfer Complete 和 Transfer Complete 在每次缓冲区一半被填充时通知IRQ。新数据。

要使此设置正常运行，您将需要大量研究ADC，Timer和DMA的文档-但值得付出努力，因为它可以巧妙地解决您的任务！

如何使用Nucleo-F303K8每1us进行adc转换？

如何解决如何使用Nucleo-F303K8每1us进行adc转换？

解决方法

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