STM32F3如何在Timer上触发ADC转换并使用循环DMA传输

如何解决STM32F3如何在Timer上触发ADC转换并使用循环DMA传输

我使用STM32F303发现板。我想在每次定时器触发时触发一行ADC转换以填充DMA缓冲区。我正在使用HAL，我知道使用裸机可以更轻松地解决此问题。

我已经找到了这篇文章，并且答案对我很有帮助，但是我似乎仍然无法运行它。 How to do a adc conversion every 1us with Nucleo-F303K8?

要么Im使ADC随其采样时间不断转换，要么当Im使用定时器作为触发输入时，我都会得到一次转换。

这是我的ADC和计时器的初始化代码：

void MX_ADC1_Init(void)
{

  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_MultiModeTypeDef multimode = {0};
  ADC_ChannelConfTypeDef sConfig = {0};

  /* USER CODE BEGIN ADC1_Init 1 */

  /* USER CODE END ADC1_Init 1 */
  /** 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 = ENABLE;
  hadc1.Init.discontinuousConvMode = disABLE;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T3_TRGO;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrofConversion = 1;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;
  hadc1.Init.LowPowerAutoWait = disABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
      adcErrorHandler();
  }
  /** Configure the ADC multi-mode
  */
  multimode.Mode = ADC_MODE_INDEPENDENT;
  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1,&multimode) != HAL_OK)
  {
      adcErrorHandler();
  }
  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_2;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.SamplingTime = ADC_SAMPLETIME_61CYCLES_5;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1,&sConfig) != HAL_OK)
  {
      adcErrorHandler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */

  /* USER CODE END ADC1_Init 2 */

}

static void MX_TIM3_Init(void)
{

  /* USER CODE BEGIN TIM3_Init 0 */

  /* USER CODE END TIM3_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  /* USER CODE BEGIN TIM3_Init 1 */

  /* USER CODE END TIM3_Init 1 */
  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 72-1;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 100;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3,&sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_disABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3,&sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM3_Init 2 */

  /* USER CODE END TIM3_Init 2 */

}

我通过以下方式启动计时器和ADC

HAL_TIM_Base_Start(&htim3);
HAL_ADC_Start_DMA(&hadc1,(uint32_t*)adc1SampleBuffer,SAMPLESIZE);

将DMA配置为循环的：

Cube DMA config

然后使用以下回调获取我的示例：

void HAL_ADC_ConvHalfCpltCallback (ADC_HandleTypeDef * hadc)
void HAL_ADC_ConvCpltCallback (ADC_HandleTypeDef * hadc)

解决方法

我自己已经弄清楚了，ContinuousConvMode和DiscontinuousConvMode的设置必须是：

  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.DiscontinuousConvMode = ENABLE;

这样，它的工作原理类似于仅在计时器上触发转换，并且当缓冲区已满或半满时，它将触发回调。