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load filter to fmcomms5

Hi there,

Is the filter function on GRC FMCOMMS5 block working? I've tried to load a filter I designed using Matlab but the waveforms received seem unchanged with or without the filter. The IIO scope doesn't allow me to load any filter.

Also how to load filter to FMCOMMS5? I followed steps listed here and used cat ~/filter.txt > filter_fir_config (I couldn't save the filter to sys folders so I left it to the root folder).  However I couldn't use echo 1 > in_voltage_filter_fir_en to enable the filter, it gave the echo:write error: Invalid argument error.