stm32u575 gpdma burst length=1 配置其他数值不工作

fighter 提问时间：2026-1-25 22:08 / 未解决

问答
是否解决:	未解决

stm32u575 gpdma burst length配置为8 定时器update触发fmc操作外部adc芯片ads8588不成功，根本不触发，burst length配置为1能触发但是单次触发

跪求大神指点，感激涕零！我需要burst功能一次timeupdate 触发8次dma操作搬运8路adc数据到内存，谢谢！

配置及其代码如下：

__HAL_RCC_TIM3_CLK_ENABLE();

/* TIM3 DMA Init */
/* GPDMA1_REQUEST_TIM3_UP Init */
handle_GPDMA1_Channel13.Instance = GPDMA1_Channel13;
handle_GPDMA1_Channel13.Init.Request = GPDMA1_REQUEST_TIM3_UP;
handle_GPDMA1_Channel13.Init.BlkHWRequest = DMA_BREQ_SINGLE_BURST;
handle_GPDMA1_Channel13.Init.Direction = DMA_PERIPH_TO_MEMORY;
handle_GPDMA1_Channel13.Init.SrcInc = DMA_SINC_FIXED;
handle_GPDMA1_Channel13.Init.DestInc = DMA_DINC_INCREMENTED;
handle_GPDMA1_Channel13.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_HALFWORD;
handle_GPDMA1_Channel13.Init.DestDataWidth = DMA_DEST_DATAWIDTH_HALFWORD;
handle_GPDMA1_Channel13.Init.Priority = DMA_LOW_PRIORITY_HIGH_WEIGHT;
handle_GPDMA1_Channel13.Init.SrcBurstLength = 8;
handle_GPDMA1_Channel13.Init.DestBurstLength = 8;
handle_GPDMA1_Channel13.Init.TransferAllocatedPort = DMA_SRC_ALLOCATED_PORT0|DMA_DEST_ALLOCATED_PORT0;
handle_GPDMA1_Channel13.Init.TransferEventMode = DMA_TCEM_BLOCK_TRANSFER;
handle_GPDMA1_Channel13.Init.Mode = DMA_NORMAL;
if (HAL_DMA_Init(&handle_GPDMA1_Channel13) != HAL_OK)
{
   Error_Handler();
}

__HAL_LINKDMA(htim_base, hdma[TIM_DMA_ID_UPDATE], handle_GPDMA1_Channel13);

if (HAL_DMA_ConfigChannelAttributes(&handle_GPDMA1_Channel13, DMA_CHANNEL_NPRIV) != HAL_OK)
{
   Error_Handler();
}

/* TIM3 interrupt Init */
HAL_NVIC_SetPriority(TIM3_IRQn, 3, 0);
HAL_NVIC_EnableIRQ(TIM3_IRQn);

void start_ads8588s_convert222(void)
{
      //1、开启pwm convert 开始转换
      __HAL_RCC_GPDMA1_CLK_ENABLE();
      //HAL_TIM_Base_MspDeInit(&htim3);
      tim3_reinit();

      pwm_OutPut(); //PWM输出映射到io


      HAL_TIM_Base_Start_IT(&htim3);

      if (HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_4) != HAL_OK)
      {
            Error_Handler();
      }
      HAL_Delay(2);


      //2、使能DMA传输
      __HAL_DMA_ENABLE_IT(&handle_GPDMA1_Channel13, DMA_IT_TC);
      __HAL_DMA_DISABLE_IT(&handle_GPDMA1_Channel13,DMA_IT_HT);
      /* 使能定时器中断  */
      __HAL_TIM_ENABLE_DMA(&htim3, TIM_DMA_UPDATE);


   __HAL_TIM_CLEAR_FLAG(&htim3, TIM_FLAG_UPDATE);


      //3、开始采集数据操作FMC总线
      HAL_DMA_Start_IT(&handle_GPDMA1_Channel13, (u32)Bank1_BASE1, (u32)g_adcBuf, ADC_BUFSIZE);

}

上图的SrcBurstLength改为1  DestBurstLenth改为1  能单次触发一但改为其他不行

谢谢