STM32G070的DMA功能，如何实现外部中断触发DMA传输数据到IO口上？

考了H7的示例修改G0的，但没实现功能

代码配置
DMA

static void MX_DMA_Init(void)
{
        
  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  hdma_memtomem_dma1_channel1.Instance = DMA1_Channel1;
  hdma_memtomem_dma1_channel1.Init.Request = DMA_REQUEST_GENERATOR0;
  hdma_memtomem_dma1_channel1.Init.Direction = DMA_MEMORY_TO_PERIPH;
  hdma_memtomem_dma1_channel1.Init.PeriphInc = DMA_PINC_DISABLE;
  hdma_memtomem_dma1_channel1.Init.MemInc = DMA_MINC_ENABLE;
  hdma_memtomem_dma1_channel1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
  hdma_memtomem_dma1_channel1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
  hdma_memtomem_dma1_channel1.Init.Mode = DMA_CIRCULAR;
  hdma_memtomem_dma1_channel1.Init.Priority = DMA_PRIORITY_LOW;
  if (HAL_DMA_Init( hdma_memtomem_dma1_channel1) != HAL_OK)
  {
    Error_Handler();
  }
        
        /* Select Callbacks functions called after Transfer complete and Transfer error */
  //HAL_DMA_RegisterCallback( hdma_memtomem_dma1_channel1, HAL_DMA_XFER_CPLT_CB_ID, TransferComplete);
  HAL_DMA_RegisterCallback( hdma_memtomem_dma1_channel1, HAL_DMA_XFER_ERROR_CB_ID, TransferError);
        
  /* DMA interrupt init */
  /* DMA1_Channel1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 1, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
        
        /*##-3- Configure and enable the DMAMUX Request generator  ####################*/
  dmamux_ReqGenParams.SignalID  = HAL_DMAMUX1_REQ_GEN_EXTI0;    /* External request signal is EXTI0 signal */
  dmamux_ReqGenParams.Polarity  = HAL_DMAMUX_REQ_GEN_FALLING;//HAL_DMAMUX_REQ_GEN_RISING;    /* External request signal edge is falling  */
  dmamux_ReqGenParams.RequestNumber = 1;                        /* 1 requests on each edge of the external request signal  */

  HAL_DMAEx_ConfigMuxRequestGenerator( hdma_memtomem_dma1_channel1,  dmamux_ReqGenParams);

        
  /* NVIC configuration for DMAMUX request generator overrun errors*/
  HAL_NVIC_SetPriority(DMA1_Ch4_7_DMAMUX1_OVR_IRQn, 2, 0);
  HAL_NVIC_EnableIRQ(DMA1_Ch4_7_DMAMUX1_OVR_IRQn);


}



外部中断口PA0配置
static void EXTI_IRQHandler_Config(void)
{
  GPIO_InitTypeDef   GPIO_InitStructure;

  /* Enable GPIOC clock */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /* Configure PA.0 pin as input floating */
  GPIO_InitStructure.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  GPIO_InitStructure.Pin = GPIO_PIN_0;
  HAL_GPIO_Init(GPIOA,  GPIO_InitStructure);

//        HAL_NVIC_SetPriority(EXTI0_1_IRQn, 3, 0);
//  HAL_NVIC_EnableIRQ(EXTI0_1_IRQn);

}



主函数调用
MX_DMA_Init();
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  /* Reset transferErrorDetected to 0, it will be set to 1 if a transfer error is detected */
  transferErrorDetected = 0;
  /* Reset transferCompleteDetected to 0, it will be set to 1 if a transfer is correctly completed */
  transferCompleteDetected = 0;  

HAL_DMAEx_EnableMuxRequestGenerator ( hdma_memtomem_dma1_channel1);
        
  EXTI_IRQHandler_Config();        

  if (HAL_DMA_Start_IT( hdma_memtomem_dma1_channel1, (uint32_t) g_uitemp[0], (uint32_t) LED4_GPIO_PORT->ODR, 2) != HAL_OK)
  {
    /* Transfer Error */
    Error_Handler();
  }
        
  /* Infinite loop */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
    if (transferErrorDetected == 1)
    {
      /* Toggle LED4 with a period of 200 ms */
      //BSP_LED_Toggle(LED4);
      transferErrorDetected = 0;
    }
    if (transferCompleteDetected == 1)
    {
      /* Turn LED4 on*/
      //BSP_LED_On(LED4);
      transferCompleteDetected = 0;
    }
  }
  /* USER CODE END 3 */