SpiStartStream Parameter - ulFlags

ulFlags (ULONG) - input

Contains none or some of the following flags:

SPI_START_STREAM

Start master stream only. This is the default setting.
SPI_START_SLAVES
Start master stream and any slave streams in the same sync group. If this flag is set, the hstream must be the stream handle of a master stream.
SPI_START_PREROLL
Preroll the stream; that is, fill all the stream buffers with data. Once this is done, the stream is in a prerolled state, which enables the stream to be started more quickly. This is an asynchronous function.

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