From 14dc3f49f3df898a61e20aa3a5a3257d437bb287 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 22 Jan 2018 00:35:30 +0100
Subject: Add hardware time simulation

---
 CMakeLists.txt     |  1 +
 Dummy_Clock.cpp    | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Dummy_Settings.cpp |  5 +++++
 SoapyDummy.hpp     | 15 +++++++++++++
 4 files changed, 87 insertions(+)
 create mode 100644 Dummy_Clock.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6010eb7..b2117ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,4 +24,5 @@ SOAPY_SDR_MODULE_UTIL(
     Dummy_Settings.cpp
     Dummy_Streaming.cpp
     Dummy_Session.cpp
+    Dummy_Clock.cpp
 )
diff --git a/Dummy_Clock.cpp b/Dummy_Clock.cpp
new file mode 100644
index 0000000..ce7f767
--- /dev/null
+++ b/Dummy_Clock.cpp
@@ -0,0 +1,66 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "SoapyDummy.hpp"
+#include <SoapySDR/Logger.hpp>
+#include <SoapySDR/Formats.hpp>
+#include <chrono>
+
+std::vector<std::string> SoapyDummy::listTimeSources(void) const
+{
+    return {"internal"};
+}
+
+void SoapyDummy::setTimeSource(const std::string &source)
+{
+}
+
+std::string SoapyDummy::getTimeSource(void) const
+{
+    return "internal";
+}
+
+bool SoapyDummy::hasHardwareTime(const std::string &what) const
+{
+    return true;
+}
+
+long long SoapyDummy::getHardwareTime(const std::string &what) const
+{
+    using namespace std::chrono;
+    const auto now = steady_clock::now();
+    return duration_cast<nanoseconds>(now.time_since_epoch()).count() - m_time_epoch;
+}
+
+void SoapyDummy::setHardwareTime(const long long timeNs, const std::string &what)
+{
+    // From getHardwareTime() we have:
+    //   timeNs = now - epoch
+    // we derive
+    //   epoch = now - timeNs
+    using namespace std::chrono;
+    const auto now = steady_clock::now();
+    m_time_epoch =
+        duration_cast<nanoseconds>(now.time_since_epoch()).count() - timeNs;
+}
diff --git a/Dummy_Settings.cpp b/Dummy_Settings.cpp
index acf8614..85dc056 100644
--- a/Dummy_Settings.cpp
+++ b/Dummy_Settings.cpp
@@ -27,6 +27,11 @@
 
 SoapyDummy::SoapyDummy( const SoapySDR::Kwargs &args )
 {
+    // On startup, initialise our epoch to current time, so that
+    // it appears the counter just started counting
+    using namespace std::chrono;
+    const auto now = steady_clock::now();
+    m_time_epoch = duration_cast<nanoseconds>(now.time_since_epoch()).count();
 }
 
 SoapyDummy::~SoapyDummy( void )
diff --git a/SoapyDummy.hpp b/SoapyDummy.hpp
index e1ca79a..e89932d 100644
--- a/SoapyDummy.hpp
+++ b/SoapyDummy.hpp
@@ -25,6 +25,7 @@
 #pragma once
 #include <string.h>
 #include <mutex>
+#include <chrono>
 #include <condition_variable>
 #include <SoapySDR/Device.hpp>
 #include <SoapySDR/Logger.hpp>
@@ -183,6 +184,18 @@ class SoapyDummy : public SoapySDR::Device
         double getBandwidth( const int direction, const size_t channel ) const;
         std::vector<double> listBandwidths( const int direction, const size_t channel ) const;
 
+        /*******************************************************************
+         * Time API
+         ******************************************************************/
+
+        virtual std::vector<std::string> listTimeSources(void) const;
+        virtual void setTimeSource(const std::string &source);
+        virtual std::string getTimeSource(void) const;
+
+        virtual bool hasHardwareTime(const std::string &what = "") const;
+        virtual long long getHardwareTime(const std::string &what = "") const;
+        virtual void setHardwareTime(const long long timeNs, const std::string &what = "");
+
         /*******************************************************************
          * Dummy callback
          ******************************************************************/
@@ -204,4 +217,6 @@ class SoapyDummy : public SoapySDR::Device
         SoapyDummySession m_session;
         double m_samplerate = 0;
         double m_frequency = 0;
+
+        long long m_time_epoch;
 };
-- 
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