soapy: support automatic bandwidth param

When the special 0.0 bandwidth setting is used, set the filter bandwidth to rate * 0.75.
Passing automatic 0.0 bandwidth for some devices was problematic.
soapy_support
Josh Blum 7 years ago
parent 164a09fc11
commit e3b6560b04
  1. 5
      lib/soapy/soapy_sink_c.cc
  2. 5
      lib/soapy/soapy_source_c.cc

@ -1,6 +1,6 @@
/* -*- c++ -*- */
/*
* Copyright 2015 Josh Blum <josh@joshknows.com>
* Copyright 2015-2016 Josh Blum <josh@joshknows.com>
* Copyright 2013 Dimitri Stolnikov <horiz0n@gmx.net>
*
* GNU Radio is free software; you can redistribute it and/or modify
@ -272,6 +272,9 @@ void soapy_sink_c::set_iq_balance( const std::complex<double> &balance, size_t c
double soapy_sink_c::set_bandwidth( double bandwidth, size_t chan)
{
if ( bandwidth == 0.0 ) /* bandwidth of 0 means automatic filter selection */
set_bandwidth(get_sample_rate() * 0.75, chan); /* select narrower filters to prevent aliasing */
_device->setBandwidth(SOAPY_SDR_TX, chan, bandwidth);
return this->get_bandwidth(chan);
}

@ -1,6 +1,6 @@
/* -*- c++ -*- */
/*
* Copyright 2015 Josh Blum <josh@joshknows.com>
* Copyright 2015-2016 Josh Blum <josh@joshknows.com>
* Copyright 2013 Dimitri Stolnikov <horiz0n@gmx.net>
*
* GNU Radio is free software; you can redistribute it and/or modify
@ -292,6 +292,9 @@ void soapy_source_c::set_iq_balance( const std::complex<double> &balance, size_t
double soapy_source_c::set_bandwidth( double bandwidth, size_t chan )
{
if ( bandwidth == 0.0 ) /* bandwidth of 0 means automatic filter selection */
set_bandwidth(get_sample_rate() * 0.75, chan); /* select narrower filters to prevent aliasing */
_device->setBandwidth(SOAPY_SDR_RX, chan, bandwidth);
return this->get_bandwidth(chan);
}

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