Hi,

  I've added a control to the hdsp driver to control the dds register on the 9632. This allows fine tuning of the sample rate as is supported by the windows driver. The feature is implemented as an offset to the current sample rate, since most of the code assumes only discrete sample rates are supported. So the sample rate will always be selected and indicated as one of the standard supported sample rates but may actually be a few % higher or lower. It seems to work very well.

One possible application is to discipline the sample rate from the system clock or a GPS receiver to provide a long term accurate precise frequency source without expensive reference clocks.

The patch is against alsa-driver-1.0.14rc3

Julian