Question
linked-list GPDMA to SPI TX triggered by timer15 TRGO does not work
/**
* @brief DMA Linked-list yWaveQ configuration
* @PAram None
* @retval None
*/
HAL_StatusTypeDef MX_yWaveQ_Config(void)
{
HAL_StatusTypeDef ret = HAL_OK;
/* DMA node configuration declaration */
DMA_NodeConfTypeDef pNodeConfig;
/* Set node configuration ################################################*/
pNodeConfig.NodeType = DMA_GPDMA_LINEAR_NODE;
pNodeConfig.Init.Request = GPDMA1_REQUEST_SPI3_TX;
pNodeConfig.Init.BlkHWRequest = DMA_BREQ_SINGLE_BURST;
pNodeConfig.Init.Direction = DMA_MEMORY_TO_PERIPH;
pNodeConfig.Init.SrcInc = DMA_SINC_INCREMENTED;
pNodeConfig.Init.DestInc = DMA_DINC_FIXED;
pNodeConfig.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_BYTE;
pNodeConfig.Init.DestDataWidth = DMA_DEST_DATAWIDTH_BYTE;
pNodeConfig.Init.SrcBurstLength = 2;
pNodeConfig.Init.DestBurstLength = 1;
pNodeConfig.Init.TransferAllocatedPort = DMA_SRC_ALLOCATED_PORT0|DMA_DEST_ALLOCATED_PORT1;
pNodeConfig.Init.TransferEventMode = DMA_TCEM_BLOCK_TRANSFER;
pNodeConfig.TriggerConfig.TriggerMode = DMA_TRIGM_SINGLE_BURST_TRANSFER ;
pNodeConfig.TriggerConfig.TriggerPolarity = DMA_TRIG_POLARITY_RISING;
pNodeConfig.TriggerConfig.TriggerSelection = GPDMA1_TRIGGER_TIM15_TRGO;
pNodeConfig.DataHandlingConfig.DataExchange = DMA_EXCHANGE_NONE;
pNodeConfig.DataHandlingConfig.DataAlignment = DMA_DATA_RIGHTALIGN_ZEROPADDED;
pNodeConfig.SrcAddress = (uint32_t)SpiTable[0];
pNodeConfig.DstAddress = (uint32_t)&(SPI3->TXDR);
pNodeConfig.DataSize = 8;
/* Build DMASpi1 Node */
ret |= HAL_DMAEx_List_BuildNode(&pNodeConfig, &DMASpi1);
/* Insert DMASpi1 to Queue */
ret |= HAL_DMAEx_List_InsertNode_Tail(&yWaveQ, &DMASpi1);
/* Set node configuration ################################################*/
pNodeConfig.SrcAddress = (uint32_t)SpiTable[1];
/* Build DMASpi2 Node */
ret |= HAL_DMAEx_List_BuildNode(&pNodeConfig, &DMASpi2);
/* Insert DMASpi2 to Queue */
ret |= HAL_DMAEx_List_InsertNode_Tail(&yWaveQ, &DMASpi2);
ret |= HAL_DMAEx_List_SetCircularModeConfig(&yWaveQ, &DMASpi1);
return ret;
} MX_yWaveQ_Config();
HAL_DMAEx_List_LinkQ(&handle_GPDMA1_Channel2, &yWaveQ);
HAL_DMAEx_List_Start(&handle_GPDMA1_Channel2);
__HAL_SPI_ENABLE(&hspi3);
HAL_TIM_Base_Start(&htim15);There is no output observed at SPI SCK pin.
Any suggestion is welcome.