STM32H5 GPDMA Timer circular buffering interrupt issue
Hi,
I am using linked list mode for circular buffering DMA with Timer1 in burst mode. The expectation is that after 300 transfer from memory to timer 1 CCR register, the DMA should start again with the buffer. To do that I need to use Half Trasfer interrupt and Transfer complete interrupt to elaborate the buffer.
It happen something strange, I receive interrupt for each data transferred from memory to peripheral, instead of the half/complete transfer, so I cannot process the buffer.
Here is my configuration:
//Setting of DMA Burst for Timer
dmacfg.Request = req;
dmacfg.DestAddress = dest;
dmacfg.Direction = LL_DMA_DIRECTION_MEMORY_TO_PERIPH;
dmacfg.BlkHWRequest = LL_DMA_HWREQUEST_BLK;//LL_DMA_HWREQUEST_SINGLEBURST;
dmacfg.DataAlignment = LL_DMA_DATA_ALIGN_ZEROPADD;
dmacfg.SrcBurstLength = srclen;
dmacfg.DestBurstLength = dstlen;
dmacfg.SrcDataWidth = LL_DMA_SRC_DATAWIDTH_HALFWORD;
dmacfg.DestDataWidth = LL_DMA_DEST_DATAWIDTH_HALFWORD;
dmacfg.SrcIncMode = LL_DMA_SRC_INCREMENT;
dmacfg.DestIncMode = LL_DMA_DEST_FIXED;
dmacfg.Priority = LL_DMA_HIGH_PRIORITY;
dmacfg.SrcAllocatedPort = LL_DMA_SRC_ALLOCATED_PORT0;
dmacfg.DestAllocatedPort = LL_DMA_DEST_ALLOCATED_PORT1;
dmacfg.Mode = LL_DMA_NORMAL;//LL_DMA_PFCTRL;
I am using Channel 0 and 1 of GPDMA2. I did some test and I can get it working with Channel 0 and 7.
The linked list is made of only one item for updating the source address.
Have someone already experienced this kind of issue?
Thank you