From c67b06fd6541bbcd59de459e82735974cbdb3d88 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Fri, 3 Dec 2010 11:46:47 -0500
Subject: usrp: move dsp tuning wrap-around into the dsp utils (allows the dsp
 handler to get the full value)

---
 host/lib/usrp/dsp_utils.cpp   | 13 +++++++++----
 host/lib/usrp/tune_helper.cpp |  7 +------
 2 files changed, 10 insertions(+), 10 deletions(-)

(limited to 'host/lib')

diff --git a/host/lib/usrp/dsp_utils.cpp b/host/lib/usrp/dsp_utils.cpp
index 2553e4a25..576c4639f 100644
--- a/host/lib/usrp/dsp_utils.cpp
+++ b/host/lib/usrp/dsp_utils.cpp
@@ -21,6 +21,8 @@
 #include <boost/assign/list_of.hpp>
 #include <boost/tuple/tuple.hpp>
 #include <boost/math/special_functions/round.hpp>
+#include <boost/math/special_functions/sign.hpp>
+#include <algorithm>
 #include <cmath>
 
 using namespace uhd;
@@ -65,13 +67,16 @@ boost::uint32_t dsp_type1::calc_tx_mux_word(subdev_conn_t subdev_conn){
 }
 
 boost::uint32_t dsp_type1::calc_cordic_word_and_update(
-    double &freq,
-    double codec_rate
+    double &freq, double codec_rate
 ){
-    UHD_ASSERT_THROW(std::abs(freq) <= codec_rate/2.0);
-    static const double scale_factor = std::pow(2.0, 32);
+    //correct for outside of rate (wrap around)
+    freq = std::fmod(freq, codec_rate);
+    if (std::abs(freq) > codec_rate/2.0)
+        freq -= boost::math::sign(freq)*codec_rate;
 
     //calculate the freq register word (signed)
+    UHD_ASSERT_THROW(std::abs(freq) <= codec_rate/2.0);
+    static const double scale_factor = std::pow(2.0, 32);
     boost::int32_t freq_word = boost::int32_t(boost::math::round((freq / codec_rate) * scale_factor));
 
     //update the actual frequency
diff --git a/host/lib/usrp/tune_helper.cpp b/host/lib/usrp/tune_helper.cpp
index fa40a8a26..eccee7f4b 100644
--- a/host/lib/usrp/tune_helper.cpp
+++ b/host/lib/usrp/tune_helper.cpp
@@ -20,7 +20,6 @@
 #include <uhd/usrp/dsp_props.hpp>
 #include <uhd/usrp/dboard_iface.hpp> //unit_t
 #include <uhd/utils/algorithm.hpp>
-#include <boost/math/special_functions/sign.hpp>
 #include <cmath>
 
 using namespace uhd;
@@ -37,7 +36,6 @@ static tune_result_t tune_xx_subdev_and_dsp(
     wax::obj subdev_freq_proxy = subdev[SUBDEV_PROP_FREQ];
     std::string freq_name = dsp[DSP_PROP_FREQ_SHIFT_NAMES].as<prop_names_t>().at(chan);
     wax::obj dsp_freq_proxy = dsp[named_prop_t(DSP_PROP_FREQ_SHIFT, freq_name)];
-    double dsp_sample_rate = dsp[DSP_PROP_CODEC_RATE].as<double>();
 
     //------------------------------------------------------------------
     //-- calculate the LO offset, only used with automatic policy
@@ -73,10 +71,7 @@ static tune_result_t tune_xx_subdev_and_dsp(
     //------------------------------------------------------------------
     //-- calculate the dsp freq, only used with automatic policy
     //------------------------------------------------------------------
-    double delta_freq = std::fmod(tune_request.target_freq - actual_inter_freq, dsp_sample_rate);
-    bool outside_of_nyquist = std::abs(delta_freq) > dsp_sample_rate/2.0;
-    double target_dsp_freq = (outside_of_nyquist)?
-        boost::math::sign(delta_freq)*dsp_sample_rate - delta_freq : -delta_freq;
+    double target_dsp_freq = actual_inter_freq - tune_request.target_freq;
 
     //invert the sign on the dsp freq given the following conditions
     if (unit == dboard_iface::UNIT_TX) target_dsp_freq *= -1.0;
-- 
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