Merge branch 'maint'

14 files changed, 125 insertions, 49 deletions

diff --git a/host/examples/tx_samples_c.c b/host/examples/tx_samples_c.c
index e10d585ce..3c3fcc8fe 100644
--- a/host/examples/tx_samples_c.c
+++ b/host/examples/tx_samples_c.c
@@ -196,7 +196,7 @@ int main(int argc, char* argv[]){
     buffs_ptr = (const void**)&buff;
     size_t i = 0;
     for(i = 0; i < (samps_per_buff*2); i+=2){
-        buff[i] = 0.1;
+        buff[i]   = 0.1f;
         buff[i+1] = 0;
     }
 
diff --git a/host/lib/convert/convert_impl.cpp b/host/lib/convert/convert_impl.cpp
index d90bb9c94..7dfbb33fd 100644
--- a/host/lib/convert/convert_impl.cpp
+++ b/host/lib/convert/convert_impl.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011 Ettus Research LLC
+// Copyright 2011,2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -162,7 +162,6 @@ UHD_STATIC_BLOCK(convert_register_item_sizes){
     convert::register_bytes_per_item("sc64", sizeof(std::complex<boost::int64_t>));
     convert::register_bytes_per_item("sc32", sizeof(std::complex<boost::int32_t>));
     convert::register_bytes_per_item("sc16", sizeof(std::complex<boost::int16_t>));
-    convert::register_bytes_per_item("sc12", 3 * sizeof(std::complex<boost::int8_t>));
     convert::register_bytes_per_item("sc8", sizeof(std::complex<boost::int8_t>));
 
     //register standard real types
diff --git a/host/lib/usrp_clock/octoclock/common.h b/host/lib/usrp_clock/octoclock/common.h
index 89fec9ce5..191b93d36 100644
--- a/host/lib/usrp_clock/octoclock/common.h
+++ b/host/lib/usrp_clock/octoclock/common.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2015 Ettus Research LLC
+ * Copyright 2014-2016 Ettus Research LLC
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -46,7 +46,8 @@ extern "C" {
 
 // These values are placed in the octoclock_packet_t.proto_ver field
 #define OCTOCLOCK_BOOTLOADER_PROTO_VER 1234
-#define OCTOCLOCK_FW_COMPAT_NUM           3
+#define OCTOCLOCK_FW_MIN_COMPAT_NUM       2
+#define OCTOCLOCK_FW_COMPAT_NUM           4
 
 // UDP ports assigned for different tasks
 #define OCTOCLOCK_UDP_CTRL_PORT   50000
diff --git a/host/lib/usrp_clock/octoclock/octoclock_eeprom.cpp b/host/lib/usrp_clock/octoclock/octoclock_eeprom.cpp
index 49d1a0442..8ac38011d 100644
--- a/host/lib/usrp_clock/octoclock/octoclock_eeprom.cpp
+++ b/host/lib/usrp_clock/octoclock/octoclock_eeprom.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2014-2015 Ettus Research LLC
+// Copyright 2014-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -46,7 +46,8 @@ void octoclock_eeprom_t::_load(){
     const octoclock_fw_eeprom_t *eeprom_in = reinterpret_cast<const octoclock_fw_eeprom_t*>(pkt_in->data);
 
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = uhd::htonx<boost::uint32_t>(std::rand());
+    // To avoid replicating sequence numbers between sessions
+    pkt_out.sequence = boost::uint32_t(std::rand());
     size_t len = 0;
 
     UHD_OCTOCLOCK_SEND_AND_RECV(xport, SEND_EEPROM_CMD, pkt_out, len, octoclock_data);
@@ -94,7 +95,8 @@ void octoclock_eeprom_t::_store() const {
     const octoclock_packet_t *pkt_in = reinterpret_cast<const octoclock_packet_t *>(octoclock_data);
 
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = uhd::htonx<boost::uint32_t>(std::rand());
+    // To avoid replicating sequence numbers between sessions
+    pkt_out.sequence = boost::uint32_t(std::rand());
     pkt_out.len = sizeof(octoclock_fw_eeprom_t);
     size_t len = 0;
 
diff --git a/host/lib/usrp_clock/octoclock/octoclock_image_loader.cpp b/host/lib/usrp_clock/octoclock/octoclock_image_loader.cpp
index fdb254024..e12256c15 100644
--- a/host/lib/usrp_clock/octoclock/octoclock_image_loader.cpp
+++ b/host/lib/usrp_clock/octoclock/octoclock_image_loader.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2015 Ettus Research LLC
+// Copyright 2015-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -59,9 +59,11 @@ typedef struct {
     std::string                 image_filepath;
     boost::uint16_t             crc;
     boost::uint16_t             num_blocks;
+    boost::uint32_t             sequence;
     udp_simple::sptr            ctrl_xport;
     udp_simple::sptr            fw_xport;
     boost::uint8_t              data_in[udp_simple::mtu];
+    boost::uint32_t             starting_firmware_version;
     std::vector<boost::uint8_t> image;
 } octoclock_session_t;
 
@@ -169,6 +171,19 @@ static void octoclock_setup_session(octoclock_session_t &session,
                                                     BOOST_STRINGIZE(OCTOCLOCK_UDP_CTRL_PORT));
     session.fw_xport   = udp_simple::make_connected(session.dev_addr["addr"],
                                                     BOOST_STRINGIZE(OCTOCLOCK_UDP_FW_PORT));
+    // To avoid replicating sequence numbers between sessions
+    session.sequence   = boost::uint32_t(std::rand());
+
+    // Query OctoClock again to get compat number
+    octoclock_packet_t pkt_out;
+    const octoclock_packet_t* pkt_in = reinterpret_cast<const octoclock_packet_t*>(session.data_in);
+    size_t len = 0;
+    UHD_OCTOCLOCK_SEND_AND_RECV(session.ctrl_xport, OCTOCLOCK_QUERY_CMD, pkt_out, len, session.data_in);
+    if(UHD_OCTOCLOCK_PACKET_MATCHES(OCTOCLOCK_QUERY_ACK, pkt_out, pkt_in, len)){
+        session.starting_firmware_version = uhd::htonx<boost::uint32_t>(pkt_in->proto_ver);
+    } else {
+        throw uhd::runtime_error("Failed to communicate with OctoClock.");
+    }
 }
 
 static void octoclock_reset_into_bootloader(octoclock_session_t &session){
@@ -177,15 +192,18 @@ static void octoclock_reset_into_bootloader(octoclock_session_t &session){
     if(session.dev_addr["type"] == "octoclock-bootloader")
         return;
 
+    // Force compat num to device's current, works around old firmware bug
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = uhd::htonx<boost::uint32_t>(std::rand());
-    const octoclock_packet_t* pkt_in = reinterpret_cast<const octoclock_packet_t*>(session.data_in);
-    size_t len;
+    pkt_out.sequence = uhd::htonx<boost::uint32_t>(++session.sequence);
+    pkt_out.proto_ver = uhd::htonx<boost::uint32_t>(session.starting_firmware_version);
+    pkt_out.code = RESET_CMD;
 
     std::cout << " -- Resetting into bootloader..." << std::flush;
-    UHD_OCTOCLOCK_SEND_AND_RECV(session.ctrl_xport, RESET_CMD, pkt_out, len, session.data_in);
-    if(UHD_OCTOCLOCK_PACKET_MATCHES(RESET_ACK, pkt_out, pkt_in, len)){
+    session.ctrl_xport->send(boost::asio::buffer(&pkt_out, sizeof(octoclock_packet_t))); \
+    size_t len = session.ctrl_xport->recv(boost::asio::buffer(session.data_in), 2);\
+    const octoclock_packet_t* pkt_in = reinterpret_cast<const octoclock_packet_t*>(session.data_in);
 
+    if(UHD_OCTOCLOCK_PACKET_MATCHES(RESET_ACK, pkt_out, pkt_in, len)){
         // Make sure this device is now in its bootloader
         boost::this_thread::sleep(boost::posix_time::milliseconds(500));
         uhd::device_addrs_t octoclocks = uhd::device::find(
@@ -217,7 +235,7 @@ static void octoclock_burn(octoclock_session_t &session){
     octoclock_reset_into_bootloader(session);
 
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = htonx<boost::uint32_t>(std::rand());
+    pkt_out.sequence = uhd::htonx<boost::uint32_t>(++session.sequence);
     const octoclock_packet_t* pkt_in = reinterpret_cast<const octoclock_packet_t*>(session.data_in);
 
     // Tell OctoClock to prepare for burn
@@ -237,7 +255,7 @@ static void octoclock_burn(octoclock_session_t &session){
 
     // Start burning
     for(size_t i = 0; i < session.num_blocks; i++){
-        pkt_out.sequence++;
+        pkt_out.sequence = uhd::htonx<boost::uint32_t>(++session.sequence);
         pkt_out.addr = i * OCTOCLOCK_BLOCK_SIZE;
 
         std::cout << str(boost::format("\r -- Loading firmware: %d%% (%d/%d blocks)")
@@ -260,16 +278,16 @@ static void octoclock_burn(octoclock_session_t &session){
 }
 
 static void octoclock_verify(octoclock_session_t &session){
-    
+
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = htonx<boost::uint32_t>(std::rand());
+    pkt_out.sequence = uhd::htonx<boost::uint32_t>(++session.sequence);
     const octoclock_packet_t* pkt_in = reinterpret_cast<const octoclock_packet_t*>(session.data_in);
     size_t len = 0;
 
     boost::uint8_t image_part[OCTOCLOCK_BLOCK_SIZE];
     boost::uint16_t cmp_len = 0;
     for(size_t i = 0; i < session.num_blocks; i++){
-        pkt_out.sequence++;
+        pkt_out.sequence = uhd::htonx<boost::uint32_t>(++session.sequence);
         pkt_out.addr = i * OCTOCLOCK_BLOCK_SIZE;
 
         std::cout << str(boost::format("\r -- Verifying firmware load: %d%% (%d/%d blocks)")
@@ -302,7 +320,7 @@ static void octoclock_verify(octoclock_session_t &session){
 static void octoclock_finalize(octoclock_session_t &session){
 
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = htonx<boost::uint32_t>(std::rand());
+    pkt_out.sequence = uhd::htonx<boost::uint32_t>(++session.sequence);
     const octoclock_packet_t* pkt_in = reinterpret_cast<const octoclock_packet_t*>(session.data_in);
     size_t len = 0;
 
diff --git a/host/lib/usrp_clock/octoclock/octoclock_impl.cpp b/host/lib/usrp_clock/octoclock/octoclock_impl.cpp
index 94e8b05d8..7ca83ddb1 100644
--- a/host/lib/usrp_clock/octoclock/octoclock_impl.cpp
+++ b/host/lib/usrp_clock/octoclock/octoclock_impl.cpp
@@ -110,7 +110,8 @@ device_addrs_t octoclock_find(const device_addr_t &hint){
     //Send a query packet
     octoclock_packet_t pkt_out;
     pkt_out.proto_ver = OCTOCLOCK_FW_COMPAT_NUM;
-    pkt_out.sequence = uhd::htonx<boost::uint32_t>(std::rand());
+    // To avoid replicating sequence numbers between sessions
+    pkt_out.sequence = boost::uint32_t(std::rand());
     pkt_out.len = 0;
     pkt_out.code = OCTOCLOCK_QUERY_CMD;
     try{
@@ -144,12 +145,17 @@ device_addrs_t octoclock_find(const device_addr_t &hint){
                     new_addr["type"] = "octoclock-bootloader";
                     octoclock_addrs.push_back(new_addr);
                 }
-                else{
+                else {
                     new_addr["type"] = "octoclock";
 
-                    octoclock_eeprom_t oc_eeprom(ctrl_xport);
-                    new_addr["name"] = oc_eeprom["name"];
-                    new_addr["serial"] = oc_eeprom["serial"];
+                    if(pkt_in->proto_ver >= OCTOCLOCK_FW_MIN_COMPAT_NUM and pkt_in->proto_ver <= OCTOCLOCK_FW_COMPAT_NUM) {
+                        octoclock_eeprom_t oc_eeprom(ctrl_xport);
+                        new_addr["name"] = oc_eeprom["name"];
+                        new_addr["serial"] = oc_eeprom["serial"];
+                    } else {
+                        new_addr["name"] = "";
+                        new_addr["serial"] = "";
+                    }
 
                     //Filter based on optional keys (if any)
                     if(
@@ -184,7 +190,8 @@ octoclock_impl::octoclock_impl(const device_addr_t &_device_addr){
     UHD_MSG(status) << "Opening an OctoClock device..." << std::endl;
     _type = device::CLOCK;
     device_addrs_t device_args = separate_device_addr(_device_addr);
-    _sequence = std::rand();
+    // To avoid replicating sequence numbers between sessions
+    _sequence = boost::uint32_t(std::rand());
 
     ////////////////////////////////////////////////////////////////////
     // Initialize the property tree
@@ -220,7 +227,7 @@ octoclock_impl::octoclock_impl(const device_addr_t &_device_addr){
         // Check the firmware compatibility number
         ////////////////////////////////////////////////////////////////////
         boost::uint32_t fw_version = _get_fw_version(oc);
-        if(fw_version != OCTOCLOCK_FW_COMPAT_NUM){
+        if(fw_version < OCTOCLOCK_FW_MIN_COMPAT_NUM or fw_version > OCTOCLOCK_FW_COMPAT_NUM){
             throw uhd::runtime_error(str(boost::format(
                     "\n\nPlease update your OctoClock's firmware.\n"
                     "Expected firmware compatibility number %d, but got %d:\n"
@@ -325,7 +332,7 @@ void octoclock_impl::_set_eeprom(const std::string &oc, const octoclock_eeprom_t
 
 boost::uint32_t octoclock_impl::_get_fw_version(const std::string &oc){
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = _sequence++;
+    pkt_out.sequence = uhd::htonx<boost::uint32_t>(++_sequence);
     pkt_out.len = 0;
     size_t len;
 
@@ -341,7 +348,7 @@ boost::uint32_t octoclock_impl::_get_fw_version(const std::string &oc){
 
 void octoclock_impl::_get_state(const std::string &oc){
     octoclock_packet_t pkt_out;
-    pkt_out.sequence = _sequence++;
+    pkt_out.sequence = uhd::htonx<boost::uint32_t>(++_sequence);
     pkt_out.len = 0;
     size_t len = 0;
 
diff --git a/host/lib/usrp_clock/octoclock/octoclock_uart.cpp b/host/lib/usrp_clock/octoclock/octoclock_uart.cpp
index f366bac30..e0a9f08cf 100644
--- a/host/lib/usrp_clock/octoclock/octoclock_uart.cpp
+++ b/host/lib/usrp_clock/octoclock/octoclock_uart.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2014-2015 Ettus Research LLC
+// Copyright 2014-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -47,11 +47,13 @@ namespace uhd{
         _state.pos = 0;
         _device_state.num_wraps = 0;
         _device_state.pos = 0;
+        // To avoid replicating sequence numbers between sessions
+        _sequence = boost::uint32_t(std::rand());
         size_t len = 0;
 
         //Get pool size from device
         octoclock_packet_t pkt_out;
-        pkt_out.sequence = uhd::htonx<boost::uint16_t>(std::rand());
+        pkt_out.sequence = uhd::htonx<boost::uint32_t>(_sequence);
         pkt_out.len = 0;
 
         boost::uint8_t octoclock_data[udp_simple::mtu];
@@ -70,7 +72,7 @@ namespace uhd{
         size_t len = 0;
 
         octoclock_packet_t pkt_out;
-        pkt_out.sequence = uhd::htonx<boost::uint32_t>(std::rand());
+        pkt_out.sequence = uhd::htonx<boost::uint32_t>(++_sequence);
         pkt_out.len = to_send.size();
         memcpy(pkt_out.data, to_send.c_str(), to_send.size());
 
@@ -111,14 +113,13 @@ namespace uhd{
     void octoclock_uart_iface::_update_cache(){
         octoclock_packet_t pkt_out;
         pkt_out.len = 0;
-        pkt_out.sequence = 0;
         size_t len = 0;
 
         boost::uint8_t octoclock_data[udp_simple::mtu];
         const octoclock_packet_t *pkt_in = reinterpret_cast<octoclock_packet_t*>(octoclock_data);
 
         if(STATES_EQUAL or LOCAL_STATE_AHEAD){
-            pkt_out.sequence++;
+            pkt_out.sequence = uhd::htonx<boost::uint32_t>(++_sequence);
             UHD_OCTOCLOCK_SEND_AND_RECV(_udp, SEND_GPSDO_CACHE_CMD, pkt_out, len, octoclock_data);
             if(UHD_OCTOCLOCK_PACKET_MATCHES(SEND_GPSDO_CACHE_ACK, pkt_out, pkt_in, len)){
                 memcpy(&_cache[0], pkt_in->data, _poolsize);
@@ -137,7 +138,7 @@ namespace uhd{
                     //We may have wrapped around locally
                     if(_state.pos == 0) _state.num_wraps++;
                 }
-                _state.pos = (_state.pos+1) % _poolsize;
+                if (_cache[_state.pos] == '\n') _state.pos = (_state.pos+1) % _poolsize;
                 //We may have wrapped around locally
                 if(_state.pos == 0) _state.num_wraps++;
             }
@@ -145,7 +146,7 @@ namespace uhd{
     }
 
     char octoclock_uart_iface::_getchar(){
-        if(LOCAL_STATE_AHEAD){
+        if(STATES_EQUAL or LOCAL_STATE_AHEAD){
             return 0;
         }
 
diff --git a/host/lib/usrp_clock/octoclock/octoclock_uart.hpp b/host/lib/usrp_clock/octoclock/octoclock_uart.hpp
index 05d1bb121..d7a77288f 100644
--- a/host/lib/usrp_clock/octoclock/octoclock_uart.hpp
+++ b/host/lib/usrp_clock/octoclock/octoclock_uart.hpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2014 Ettus Research LLC
+// Copyright 2014,2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -45,6 +45,7 @@ private:
     gpsdo_cache_state_t _device_state;
     std::vector<boost::uint8_t> _cache;
     std::string _rxbuff;
+    boost::uint32_t _sequence;
 
     void _update_cache();
     char _getchar();
diff --git a/host/lib/utils/CMakeLists.txt b/host/lib/utils/CMakeLists.txt
index 72e2f3f50..790ef72ad 100644
--- a/host/lib/utils/CMakeLists.txt
+++ b/host/lib/utils/CMakeLists.txt
@@ -119,11 +119,18 @@ SET_SOURCE_FILES_PROPERTIES(
 FILE(TO_NATIVE_PATH ${CMAKE_INSTALL_PREFIX} UHD_PKG_PATH)
 STRING(REPLACE "\\" "\\\\" UHD_PKG_PATH ${UHD_PKG_PATH})
 
+STRING(REGEX MATCH ".*/.*" SLASH "${LIB_SUFFIX}")
+IF(SLASH STREQUAL "")
+    SET(UHD_LIB_DIR "lib${LIB_SUFFIX}")
+ELSE()
+    SET(UHD_LIB_DIR "lib")
+ENDIF(SLASH STREQUAL "")
+
 SET_SOURCE_FILES_PROPERTIES(
     ${CMAKE_CURRENT_SOURCE_DIR}/paths.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/images.cpp
     PROPERTIES COMPILE_DEFINITIONS
-    "UHD_PKG_PATH=\"${UHD_PKG_PATH}\";UHD_LIB_DIR=\"lib${LIB_SUFFIX}\""
+    "UHD_PKG_PATH=\"${UHD_PKG_PATH}\";UHD_LIB_DIR=\"${UHD_LIB_DIR}\""
 )
 
 ########################################################################
diff --git a/host/tests/ranges_c_test.c b/host/tests/ranges_c_test.c
index da9c86a48..2398588a6 100644
--- a/host/tests/ranges_c_test.c
+++ b/host/tests/ranges_c_test.c
@@ -1,5 +1,5 @@
 //
-// Copyright 2015 Ettus Research LLC
+// Copyright 2015-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -155,7 +155,7 @@ int main(){
     if(size != 2){
         fprintf(stderr, "%s:%d: Invalid size: %lu vs. 2",
                         __FILE__, __LINE__,
-                        size);
+                        (unsigned long)size);
         goto free_meta_range1;
     }
 
diff --git a/host/tests/string_vector_c_test.c b/host/tests/string_vector_c_test.c
index fe055fd91..f7f2f7b69 100644
--- a/host/tests/string_vector_c_test.c
+++ b/host/tests/string_vector_c_test.c
@@ -1,5 +1,5 @@
 //
-// Copyright 2015 Ettus Research LLC
+// Copyright 2015-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -60,7 +60,7 @@ int main(){
     if(size != 2){
         return_code = EXIT_FAILURE;
         fprintf(stderr, "%s:%d: Invalid size: %lu vs. 2",
-                        __FILE__, __LINE__,size);
+                        __FILE__, __LINE__, (unsigned long)size);
         goto free_string_vector;
     }
 
diff --git a/host/tests/subdev_spec_c_test.c b/host/tests/subdev_spec_c_test.c
index 7663ba357..f69b825a8 100644
--- a/host/tests/subdev_spec_c_test.c
+++ b/host/tests/subdev_spec_c_test.c
@@ -1,5 +1,5 @@
 //
-// Copyright 2015 Ettus Research LLC
+// Copyright 2015-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -71,7 +71,8 @@ int main(){
         uhd_subdev_spec_size(subdev_spec2, &size2)
     )
     if(size1 != size2){
-        printf("%s:%d: Sizes do not match. %lu vs. %lu\n", __FILE__, __LINE__, size1, size2);
+        printf("%s:%d: Sizes do not match. %lu vs. %lu\n", __FILE__, __LINE__,
+               (unsigned long)size1, (unsigned long)size2);
         return_code = EXIT_FAILURE;
         goto free_subdev_spec2;
     }
diff --git a/host/utils/query_gpsdo_sensors.cpp b/host/utils/query_gpsdo_sensors.cpp
index 21d26e81e..7c5728e39 100644
--- a/host/utils/query_gpsdo_sensors.cpp
+++ b/host/utils/query_gpsdo_sensors.cpp
@@ -19,6 +19,7 @@
 #include <uhd/utils/thread_priority.hpp>
 #include <uhd/utils/safe_main.hpp>
 #include <uhd/usrp/multi_usrp.hpp>
+#include <uhd/usrp_clock/multi_usrp_clock.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/program_options.hpp>
 #include <boost/format.hpp>
@@ -41,6 +42,38 @@ void print_notes(void) {
   std::cout << boost::format("****************************************************************************************************************\n");
 }
 
+int query_clock_sensors(const std::string &args) {
+  std::cout << boost::format("\nCreating the clock device with: %s...\n") % args;
+  uhd::usrp_clock::multi_usrp_clock::sptr clock = uhd::usrp_clock::multi_usrp_clock::make(args);
+
+  //Verify GPS sensors are present
+  std::vector<std::string> sensor_names = clock->get_sensor_names(0);
+  if(std::find(sensor_names.begin(), sensor_names.end(), "gps_locked") == sensor_names.end()) {
+    std::cout << boost::format("\ngps_locked sensor not found.  This could mean that this unit does not have a GPSDO.\n\n");
+    return EXIT_FAILURE;
+  }
+
+  // Print NMEA strings
+  try {
+      uhd::sensor_value_t gga_string = clock->get_sensor("gps_gpgga");
+      uhd::sensor_value_t rmc_string = clock->get_sensor("gps_gprmc");
+      uhd::sensor_value_t servo_string = clock->get_sensor("gps_servo");
+      std::cout << boost::format("\nPrinting available NMEA strings:\n");
+      std::cout << boost::format("%s\n%s\n") % gga_string.to_pp_string() % rmc_string.to_pp_string();
+      std::cout << boost::format("\nPrinting GPS servo status:\n");
+      std::cout << boost::format("%s\n\n") % servo_string.to_pp_string();
+  } catch (uhd::lookup_error &e) {
+      std::cout << "NMEA strings not implemented for this device." << std::endl;
+  }
+  std::cout << boost::format("GPS Epoch time: %.5f seconds\n") % clock->get_sensor("gps_time").to_real();
+  std::cout << boost::format("PC Clock time:  %.5f seconds\n") % time(NULL);
+
+  //finished
+  std::cout << boost::format("\nDone!\n\n");
+
+  return EXIT_SUCCESS;
+}
+
 int UHD_SAFE_MAIN(int argc, char *argv[]){
   uhd::set_thread_priority_safe();
 
@@ -51,6 +84,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
   desc.add_options()
     ("help", "help message")
     ("args", po::value<std::string>(&args)->default_value(""), "Device address arguments specifying a single USRP")
+    ("clock", "query a clock device's sensors")
     ;
   po::variables_map vm;
   po::store(po::parse_command_line(argc, argv, desc), vm);
@@ -65,6 +99,11 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
       return EXIT_FAILURE;
   }
 
+  //If specified, query a clock device instead
+  if(vm.count("clock")) {
+      return query_clock_sensors(args);
+  }
+
   //Create a USRP device
   std::cout << boost::format("\nCreating the USRP device with: %s...\n") % args;
   uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
@@ -91,7 +130,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
       std::cout << "trying \"external\"..." <<std::endl;
       try {
           usrp->set_time_source("external");
-      } catch (uhd::value_error &e) {
+      } catch (uhd::value_error&) {
           std::cout << "\"external\" failed, too." << std::endl;
       }
   }
@@ -115,7 +154,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
       std::cout << "trying \"external\"..." <<std::endl;
       try{
           usrp->set_clock_source("external");
-      } catch (uhd::value_error &e) {
+      } catch (uhd::value_error&) {
           std::cout << "\"external\" failed, too." << std::endl;
       }
   }
@@ -179,7 +218,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
       uhd::sensor_value_t rmc_string = usrp->get_mboard_sensor("gps_gprmc");
       std::cout << boost::format("Printing available NMEA strings:\n");
       std::cout << boost::format("%s\n%s\n") % gga_string.to_pp_string() % rmc_string.to_pp_string();
-  } catch (uhd::lookup_error &e) {
+  } catch (uhd::lookup_error&) {
       std::cout << "NMEA strings not implemented for this device." << std::endl;
   }
   std::cout << boost::format("GPS Epoch time at last PPS: %.5f seconds\n") % usrp->get_mboard_sensor("gps_time").to_real();
diff --git a/host/utils/uhd_usrp_probe.cpp b/host/utils/uhd_usrp_probe.cpp
index 4a84fef55..ae86b0dba 100644
--- a/host/utils/uhd_usrp_probe.cpp
+++ b/host/utils/uhd_usrp_probe.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2010-2011,2015 Ettus Research LLC
+// Copyright 2010-2011,2015-2016 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -172,7 +172,7 @@ static std::string get_mboard_pp_string(property_tree::sptr tree, const fs_path
             ss << make_border(get_dboard_pp_string("TX", tree, path / "dboards" / name));
         }
     }
-    catch (const uhd::lookup_error &e) {
+    catch (const uhd::lookup_error&) {
         /* nop */
     }
     return ss.str();