Add subdevice to UHD configuration

4 files changed, 18 insertions, 3 deletions

diff --git a/doc/example.ini b/doc/example.ini
index 7f4e315..0f5dfe2 100644
--- a/doc/example.ini
+++ b/doc/example.ini
@@ -41,6 +41,11 @@ digital_gain=1.0
 ; Output sample rate
 rate=2048000
 
+; The USRP1 does not have flexible clocking, you will need
+;rate=3200000
+; and
+;dac_clk_rate=128000000
+
 [firfilter]
 enabled=0
 filtertapsfile=simple_taps.txt
@@ -77,9 +82,9 @@ txgain=2
 
 ; For the USRP1
 ;device=type=usrp1
-; you must change the rate in [modulator] ! The USRP1 does not have flexible
-; clocking
-;rate=3200000
+; the usrp1 can have two daughterboards, the subdevice parameter allows you
+; to choose which one to use
+;subdevice=A:0
 
 ; you must specify either frequency or channel
 ;frequency=234208000
diff --git a/src/DabMod.cpp b/src/DabMod.cpp
index 20c5ab6..d8614a7 100644
--- a/src/DabMod.cpp
+++ b/src/DabMod.cpp
@@ -441,6 +441,7 @@ int main(int argc, char* argv[])
         else if (output_selected == "uhd") {
             outputuhd_conf.device = pt.get("uhdoutput.device", "");
             outputuhd_conf.usrpType = pt.get("uhdoutput.type", "");
+            outputuhd_conf.subDevice = pt.get("uhdoutput.subdevice", "");
             outputuhd_conf.masterClockRate = pt.get<long>("uhdoutput.master_clock_rate", 0);
 
             if (outputuhd_conf.device.find("master_clock_rate") != std::string::npos) {
diff --git a/src/OutputUHD.cpp b/src/OutputUHD.cpp
index b0600cd..b44cd3f 100644
--- a/src/OutputUHD.cpp
+++ b/src/OutputUHD.cpp
@@ -108,6 +108,11 @@ OutputUHD::OutputUHD(
     myUsrp->set_clock_source(myConf.refclk_src);
     myUsrp->set_time_source(myConf.pps_src);
 
+    if (myConf.subDevice != "") {
+        myUsrp->set_tx_subdev_spec(uhd::usrp::subdev_spec_t(myConf.subDevice),
+                uhd::usrp::multi_usrp::ALL_MBOARDS);
+    }
+
     std::cerr << "UHD clock source is " <<
         myUsrp->get_clock_source(0) << std::endl;
 
diff --git a/src/OutputUHD.h b/src/OutputUHD.h
index 990822e..69e5b20 100644
--- a/src/OutputUHD.h
+++ b/src/OutputUHD.h
@@ -153,6 +153,10 @@ class UHDWorker {
 struct OutputUHDConfig {
     std::string device;
     std::string usrpType; // e.g. b100, b200, usrp2
+
+    // The USRP1 can accept two daughterboards
+    std::string subDevice; // e.g. A:0
+
     long masterClockRate;
     unsigned sampleRate;
     double frequency;