STM32L0 ADC使用DMA转换多个通道时出现问题

Question

我正在尝试使用DMA转换3个ADC通道。但是当我在调试器中观察它们时，变量似乎没有改变。我知道转换完成回调是因为我打破了它。因此，这表明DMA传输未执行且缓冲区未被填充。我正在使用stm32cube来初始化我的项目。我已经修剪了生成的代码。谢谢。

ADC_HandleTypeDef hadc;
DMA_HandleTypeDef hdma_adc;

uint32_t uwADC8ConvertedValue = 0;
uint32_t uwADC10ConvertedValue = 0;
uint32_t uwADC11ConvertedValue = 0;
uint32_t adcBuffer[3];

/* USER CODE BEGIN 0 */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *AdcHandle) {
    uwADC8ConvertedValue = adcBuffer[0];
    uwADC10ConvertedValue = adcBuffer[1];
    uwADC11ConvertedValue = adcBuffer[2];
}
/* USER CODE END 0 */

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_RTC_Init();
  MX_ADC_Init();
  MX_USART2_UART_Init();
  MX_USART5_UART_Init();
  MX_TIM2_Init();

  /* USER CODE BEGIN 2 */
    HAL_TIM_Base_Start_IT(&htim2);
  HAL_ADC_Start_IT(&hadc);
    HAL_ADC_Start_DMA(&hadc, adcBuffer, 3);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
    HAL_UART_Transmit(&huart2, TxBuffer, 15, 5000);
  GPIO_PinState userPBstate = OFF;

    while (1)
  {

  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
        HAL_GPIO_TogglePin(MODEM_PW_GPIO_Port, MODEM_PW_Pin);
        HAL_GPIO_TogglePin(CAM1_LD_GPIO_Port, CAM1_LD_Pin);
        HAL_GPIO_TogglePin(CAM1_PW_GPIO_Port, CAM1_PW_Pin);
        HAL_Delay(100);

        userPBstate = HAL_GPIO_ReadPin(USER_PB_GPIO_Port, USER_PB_Pin);
        if (userPBstate == ON) {
            HAL_UART_Transmit(&huart2, (uint8_t *)"User button pressed!\n\r", 22, 5000);
        }
        else {
            HAL_UART_Transmit(&huart2, (uint8_t *)"User button NOT pressed!\n\r", 26, 5000);
        }

    }       
  /* USER CODE END 3 */

}

/* ADC init function */
static void MX_ADC_Init(void)
{

  ADC_ChannelConfTypeDef sConfig;

    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) 
    */
  hadc.Instance = ADC1;
  hadc.Init.OversamplingMode = DISABLE;
  hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION_12B;
  hadc.Init.SamplingTime = ADC_SAMPLETIME_160CYCLES_5;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ContinuousConvMode = ENABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc.Init.DMAContinuousRequests = ENABLE;
  hadc.Init.EOCSelection = ADC_EOC_SEQ_CONV;
  hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerFrequencyMode = DISABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  if (HAL_ADC_Init(&hadc) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure for the selected ADC regular channel to be converted. 
    */
  sConfig.Channel = ADC_CHANNEL_8;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure for the selected ADC regular channel to be converted. 
    */
  sConfig.Channel = ADC_CHANNEL_10;
  if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure for the selected ADC regular channel to be converted. 
    */
  sConfig.Channel = ADC_CHANNEL_11;
  if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

}

/** 
  * 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, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

}

Answer 1

用户自定义代码：

 /* USER CODE BEGIN 2 */
    HAL_TIM_Base_Start_IT(&htim2);
  HAL_ADC_Start_IT(&hadc);
    HAL_ADC_Start_DMA(&hadc, adcBuffer, 3);
  /* USER CODE END 2 */

应该：

 /* USER CODE BEGIN 2 */
    HAL_TIM_Base_Start_IT(&htim2);
    HAL_ADC_Start_DMA(&hadc, adcBuffer, 3);
  /* USER CODE END 2 */

如果要使用DMA模式，则不要使用中断模式。