Experimental 8 channels antenna array source (GNURadio and GRC compliant) using a Gigabit Ethernet bus

git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@479 64b25241-fba3-4117-9849-534c7e92360d

drivers/gr-dbfcttc/lib/raw_array_impl.h

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+/* -*- c++ -*- */
+/* 
+ * Copyright 2014 <+YOU OR YOUR COMPANY+>.
+ * 
+ * This 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.
+ * 
+ * This software 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 this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_DBFCTTC_RAW_ARRAY_IMPL_H
+#define INCLUDED_DBFCTTC_RAW_ARRAY_IMPL_H
+
+#include <dbfcttc/raw_array.h>
+//#include <boost/thread/mutex.hpp>
+#include <boost/thread.hpp>
+#include <pcap.h>
+
+namespace gr {
+namespace dbfcttc {
+
+class raw_array_impl : public raw_array
+{
+private:
+	//omni_mutex	d_mutex; // no longer available in GNU Radio
+	boost::mutex d_mutex;
+
+	pcap_t*       descr; //ethernet pcap device descriptor
+	int fifo_pipe[2];
+
+	gr_complex **fifo_buff_ch;
+
+	int    fifo_read_ptr;
+	int    fifo_write_ptr;
+	int    fifo_items;
+
+	const char *d_src_device;
+	short d_number_of_channels;
+	int d_snapshots_per_frame;
+	int d_inter_frame_delay;
+	int d_sampling_freq;
+
+	bool d_flag_start_frame;
+	bool d_fifo_full;
+
+	int d_last_frame_counter;
+	int  d_num_rx_errors;
+
+	boost::thread *d_pcap_thread;
+	/*!
+	 * \brief
+	 * Opens the ethernet device using libpcap raw capture mode
+	 * If any of these fail, the fuction retuns the error and exits.
+	 */
+	bool open();
+	/*!
+	 * \brief
+	 * Configure the Array hardware platform with the selected parameters. Uses the same ethernet connection
+	 */
+	bool configure_array();
+	/*!
+	 * \brief
+	 * Start the array operation. Uses the same ethernet connection
+	 */
+	bool start_array();
+	/*!
+	 * \brief
+	 * Stop the array operation. Uses the same ethernet connection
+	 */
+	bool stop_array();
+
+    void my_pcap_loop_thread(pcap_t *pcap_handle);
+
+    void pcap_callback(u_char *args, const struct pcap_pkthdr* pkthdr, const u_char* packet);
+
+    static void static_pcap_callback(u_char *args, const struct pcap_pkthdr* pkthdr, const u_char* packet);
+
+
+public:
+	raw_array_impl(const char *src_device,short number_of_channels, int snapshots_per_frame, int inter_frame_delay, int sampling_freq);
+	~raw_array_impl();
+
+	// Where all the action really happens
+	int work(int noutput_items,
+			gr_vector_const_void_star &input_items,
+			gr_vector_void_star &output_items);
+};
+
+} // namespace dbfcttc
+} // namespace gr
+
+#endif /* INCLUDED_DBFCTTC_RAW_ARRAY_IMPL_H */
+