From 893f946b7a652497994309092fe84fb33504852c Mon Sep 17 00:00:00 2001
From: Thomas Tsou
Date: Fri, 19 Aug 2011 14:50:55 -0700
Subject: gr-uhd: add async metadata source block

Add asynchronous message "block" that is independent of normal
gnuradio scheduler. The block instantiates a thread to wait
for asynchronous messages from UHD and encapsulates them in a
gr_message posted into a message queue.

The interface is empty because the block is internally driven
and accessed through the the constructor specified message
queue.
---
 gr-uhd/lib/gr_uhd_amsg_source.cc | 88 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 gr-uhd/lib/gr_uhd_amsg_source.cc

(limited to 'gr-uhd/lib/gr_uhd_amsg_source.cc')

diff --git a/gr-uhd/lib/gr_uhd_amsg_source.cc b/gr-uhd/lib/gr_uhd_amsg_source.cc
new file mode 100644
index 000000000..f2958f115
--- /dev/null
+++ b/gr-uhd/lib/gr_uhd_amsg_source.cc
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2011 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <gr_uhd_amsg_source.h>
+#include <boost/bind.hpp>
+#include <gruel/thread.h>
+
+/***********************************************************************
+ * UHD Asynchronous Message Source Impl
+ **********************************************************************/
+class uhd_amsg_source_impl : public uhd_amsg_source{
+public:
+    uhd_amsg_source_impl(
+        const uhd::device_addr_t &device_addr,
+        gr_msg_queue_sptr msgq
+    ):
+        _msgq(msgq), _running(true)
+    {
+        _dev = uhd::usrp::multi_usrp::make(device_addr);
+        _amsg_thread =
+            gruel::thread(boost::bind(&uhd_amsg_source_impl::recv_loop, this));
+    }
+
+    ~uhd_amsg_source_impl()
+    {
+        _running = false;
+        _amsg_thread.join();
+    }
+
+    void recv_loop()
+    {
+        gr_message_sptr msg;
+        uhd::async_metadata_t *md;
+
+        while (_running) {
+            msg = gr_make_message(0, 0.0, 0.0, sizeof(uhd::async_metadata_t));
+            md = (uhd::async_metadata_t *) msg->msg();
+
+            while (!_dev->get_device()->recv_async_msg(*md, 0.1)) {
+                if (!_running)
+                    return;
+            }
+
+            post(msg);
+        }
+    }
+
+    void post(gr_message_sptr msg)
+    {
+        _msgq->insert_tail(msg);
+    }
+
+protected:
+    uhd::usrp::multi_usrp::sptr _dev;
+    gruel::thread _amsg_thread;
+    gr_msg_queue_sptr _msgq;
+    bool _running;
+};
+
+/***********************************************************************
+ * Make UHD Asynchronous Message Source
+ **********************************************************************/
+boost::shared_ptr<uhd_amsg_source> uhd_make_amsg_source(
+    const uhd::device_addr_t &device_addr,
+    gr_msg_queue_sptr msgq
+){
+    return boost::shared_ptr<uhd_amsg_source>(
+        new uhd_amsg_source_impl(device_addr, msgq)
+    );
+}
-- 
cgit