STM32G474RE，DAC3无法通过DMA传输数据

IncoYang 提问时间：2019-11-8 14:17 /

问答
是否解决:

实验平台：Nucleo-STM32G474RE开发板
验证功能：希望利用DMA把数据传到DAC3的DAC_DHR12R1寄存器产生波形，再通过运放的跟随输出到外部管脚
问题描述：DMA没有更新DAC3的DHR12R1寄存器数据，进而无波形产生

DAC3配置：
            static void MX_DAC3_Init(void)
{

  /* USER CODE BEGIN DAC3_Init 0 */

  /* USER CODE END DAC3_Init 0 */

  DAC_ChannelConfTypeDef sConfig = {0};

  /* USER CODE BEGIN DAC3_Init 1 */

  /* USER CODE END DAC3_Init 1 */
  /** DAC Initialization
  */
  hdac3.Instance = DAC3;
  if (HAL_DAC_Init(&hdac3) != HAL_OK)
  {
Error_Handler();
  }
  /** DAC channel OUT1 config
  */
  sConfig.DAC_HighFrequency = DAC_HIGH_FREQUENCY_INTERFACE_MODE_AUTOMATIC;
  sConfig.DAC_DMADoubleDataMode = DISABLE;
  sConfig.DAC_SignedFormat = DISABLE;
  sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
  sConfig.DAC_Trigger = DAC_TRIGGER_T2_TRGO;
  sConfig.DAC_Trigger2 = DAC_TRIGGER_NONE;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
  sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_ENABLE;
  sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
  if (HAL_DAC_ConfigChannel(&hdac3, &sConfig, DAC_CHANNEL_1) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN DAC3_Init 2 */

  /* USER CODE END DAC3_Init 2 */

}

OPAMP1配置
static void MX_OPAMP1_Init(void)
{

  /* USER CODE BEGIN OPAMP1_Init 0 */

  /* USER CODE END OPAMP1_Init 0 */

  /* USER CODE BEGIN OPAMP1_Init 1 */

  /* USER CODE END OPAMP1_Init 1 */
  hopamp1.Instance = OPAMP1;
  hopamp1.Init.PowerMode = OPAMP_POWERMODE_NORMAL;
  hopamp1.Init.Mode = OPAMP_FOLLOWER_MODE;
  hopamp1.Init.NonInvertingInput = OPAMP_NONINVERTINGINPUT_DAC;
  hopamp1.Init.InternalOutput = DISABLE;
  hopamp1.Init.TimerControlledMuxmode = OPAMP_TIMERCONTROLLEDMUXMODE_DISABLE;
  hopamp1.Init.UserTrimming = OPAMP_TRIMMING_FACTORY;
  if (HAL_OPAMP_Init(&hopamp1) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN OPAMP1_Init 2 */

  /* USER CODE END OPAMP1_Init 2 */

}

TIMER2配置：
static void MX_TIM2_Init(void)
{

  /* USER CODE BEGIN TIM2_Init 0 */

  /* USER CODE END TIM2_Init 0 */

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

  /* USER CODE BEGIN TIM2_Init 1 */

  /* USER CODE END TIM2_Init 1 */
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 169;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN TIM2_Init 2 */

  /* USER CODE END TIM2_Init 2 */

}

DMA配置：
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMAMUX1_CLK_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);

}

主程序：
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_DAC3_Init();
  MX_OPAMP1_Init();
  MX_TIM2_Init();
  /* USER CODE BEGIN 2 */
for (i=0;i<NUM;i++)
{
sinetable[i]=(uint16_t)((pow(2,12)-1)*(sin((double)i/NUM*2*Pi)));
}

HAL_OPAMP_Start(&hopamp1);
HAL_TIM_Base_Start(&htim2);
HAL_DAC_Start_DMA(&hdac3,DAC_CHANNEL_1,(uint32_t *)sinetable,NUM,DAC_ALIGN_12B_R);

问题：无波形产生，但是用软件设定值的话，可以观察到输出电压有反应，可以定位于DAC的DMA模式不工作，进而调试发现初始化的时候DMA1的EN可以使能，接着程序跑起来后EN一直就为0，如果强制把EN置1，则过后软件马上把EN清0，同时DMA的ISR寄存器中的TEIF1和GIF1被置1，说明有传输错误。请问是DMA哪里配置有问题，忽视了什么吗？谢谢