CC3200 UART DMA Demo sets UDMA_ATTR_USEBURST

Hello

I experimented a while with this CC3200 UART_DMA Demo from CC3200 SDK V1.0.0. There is a function in dma_if.c "SetupTransfer" which always sets UDMA_ATTR_USEBURST. See below.

void SetupTransfer(unsigned long ulChannel,
                   unsigned long ulMode,
                   unsigned long ulItemCount,
                   unsigned long ulItemSize,
                   unsigned long ulArbSize,
                   void *pvSrcBuf,
                   unsigned long ulSrcInc,
                   void *pvDstBuf,
                   unsigned long ulDstInc)
{

    MAP_uDMAChannelControlSet(ulChannel,
                              ulItemSize | ulSrcInc | ulDstInc | ulArbSize);
    MAP_uDMAChannelAttributeEnable(ulChannel,UDMA_ATTR_USEBURST);
    MAP_uDMAChannelTransferSet(ulChannel, ulMode,
                               pvSrcBuf, pvDstBuf, ulItemCount);
    MAP_uDMAChannelEnable(ulChannel);

}

DMA has two modes. if only one character is received (only one character is in fifo), a "single_data_transfer_request" is sent to the DMA. If this is not serviced, and further characters are received and the RX-Fifo-Threshold is exceeded, a "burst_transfer_request" is sent to the DMA.

In case of a uart_reception, it is good to have a response on single characters. But in this DMA Example, the attribute UDMA_ATTR_USEBURST exactly inhibits that!

"Single data transfer requests" are ignored and only Burst Transfer requests are serviced. In this example, only if at least two characters are in the fifo, a DMA-Transfer is invoked.

In TecRefManual_swru367b chapter 4.2.7.1 it says:
"we recommend against the use of this configuration since it could cause the tail end of transmissions to stick in the FIFO."

From my point of view, this line "MAP_uDMAChannelAttributeEnable(ulChannel,UDMA_ATTR_USEBURST);" need to be deleted or changed to AttributeDisable

Johannes