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Modify Decimation/Interpolation Factor in UHD Cpp/C API for B205mini stock FPGA image

Using a B205mini USRP.

Up this point I have been utilizing this unit with the Matlab "SDRuReceiver"/"SDRuTransmitter" system object which allows you to set the decimation/interpolation factor in the DDC step (going from IF to baseband).  However, I do not see an option to set the decimation factor in the UHD c API outside of RfNOC blocks (which is not supported in the B205).  Is there a "User Register" (accessed via uhd::multi_usrp::set_user_register() ) in the stock FPGA image that needs to be set for this?  I see references to a Decimation register in the old USRP1 firmware source, but not in the most recent source.  Any help would be appreciated.  Thanks!

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