hackrf: fix bandwidth setting
The T/R switching code added in ae2253c516
fails to set custom filter bandwidths because it sets bandwidth and
sample rate in the wrong order. As noted in the documentation for
hackrf_set_sample_rate: "If you want to override the baseband filter
selection, you must do so after setting the sample rate."
To solve this problem I moved the set_bandwidth call after
set_sample_rate. It was also necessary to skip the call if a custom
bandwidth was not requested.
Signed-off-by: Eric Wild <ewild@sysmocom.de>
This commit is contained in:
parent
9b386707d8
commit
bc629b03fe
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@ -37,6 +37,7 @@ hackrf_common::hackrf_common(const std::string &args) :
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_center_freq(0),
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_freq_corr(0),
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_auto_gain(false),
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_requested_bandwidth(0),
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_bandwidth(0),
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_bias(false),
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_started(false)
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@ -339,6 +340,7 @@ double hackrf_common::set_bandwidth( double bandwidth, size_t chan )
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int ret;
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// osmosdr::freq_range_t bandwidths = get_bandwidth_range( chan );
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_requested_bandwidth = bandwidth;
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if ( bandwidth == 0.0 ) /* bandwidth of 0 means automatic filter selection */
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bandwidth = _sample_rate * 0.75; /* select narrower filters to prevent aliasing */
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@ -411,9 +413,10 @@ bool hackrf_common::get_bias()
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void hackrf_common::start()
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{
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_started = true;
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set_bandwidth(get_bandwidth());
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set_center_freq(get_center_freq());
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set_sample_rate(get_sample_rate());
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if (_requested_bandwidth != 0)
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set_bandwidth(get_bandwidth());
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set_gain(get_gain());
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set_bias(get_bias());
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}
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@ -104,6 +104,7 @@ private:
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double _freq_corr;
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bool _auto_gain;
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double _amp_gain;
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double _requested_bandwidth;
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double _bandwidth;
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bool _bias;
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bool _started;
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