diff options
Diffstat (limited to 'host/lib/usrp/multi_usrp.cpp')
| -rw-r--r-- | host/lib/usrp/multi_usrp.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/host/lib/usrp/multi_usrp.cpp b/host/lib/usrp/multi_usrp.cpp index 1267da89c..7f61565fc 100644 --- a/host/lib/usrp/multi_usrp.cpp +++ b/host/lib/usrp/multi_usrp.cpp @@ -129,6 +129,9 @@ static tune_result_t tune_xx_subdev_and_dsp( //------------------------------------------------------------------ double lo_offset = 0.0; if (rf_fe_subtree->access<bool>("use_lo_offset").get()){ + //If the frontend has lo_offset value and range properties, trust it for lo_offset + if (rf_fe_subtree->exists("lo_offset/value")) lo_offset = rf_fe_subtree->access<double>("lo_offset/value").get(); + //If the local oscillator will be in the passband, use an offset. //But constrain the LO offset by the width of the filter bandwidth. const double rate = dsp_subtree->access<double>("rate/value").get(); @@ -147,6 +150,14 @@ static tune_result_t tune_xx_subdev_and_dsp( break; case tune_request_t::POLICY_MANUAL: + //If the rf_fe understands lo_offset settings, infer the desired lo_offset and set it + // Side effect: In TVRX2 for example, after setting the lo_offset (if_freq) with a + // POLICY_MANUAL, there is no way for the user to automatically get back to default + // if_freq without deconstruct/reconstruct the rf_fe objects. + if (rf_fe_subtree->exists("lo_offset/value")) { + rf_fe_subtree->access<double>("lo_offset/value").set(tune_request.rf_freq - tune_request.target_freq); + } + target_rf_freq = tune_request.rf_freq; rf_fe_subtree->access<double>("freq/value").set(target_rf_freq); break; |