digital: copying over rest of blocks from gnuradio-core to gr-digital.

Includes moving GRC and QA code; new ones where missing.

Have not removed blocks from gnuradio-core for compatibility.

1 files changed, 207 insertions, 0 deletions

diff --git a/gr-digital/lib/digital_packet_sink.cc b/gr-digital/lib/digital_packet_sink.cc
new file mode 100644
index 000000000..92521376f
--- /dev/null
+++ b/gr-digital/lib/digital_packet_sink.cc
@@ -0,0 +1,207 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010,2012 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <digital_packet_sink.h>
+#include <gr_io_signature.h>
+#include <cstdio>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdexcept>
+#include <gr_count_bits.h>
+#include <string.h>
+
+#define VERBOSE 0
+
+static const int DEFAULT_THRESHOLD = 12;  // detect access code with up to DEFAULT_THRESHOLD bits wrong
+
+inline void
+digital_packet_sink::enter_search()
+{
+  if (VERBOSE)
+    fprintf(stderr, "@ enter_search\n");
+
+  d_state = STATE_SYNC_SEARCH;
+  d_shift_reg = 0;
+}
+
+inline void
+digital_packet_sink::enter_have_sync()
+{
+  if (VERBOSE)
+    fprintf(stderr, "@ enter_have_sync\n");
+
+  d_state = STATE_HAVE_SYNC;
+  d_header = 0;
+  d_headerbitlen_cnt = 0;
+}
+
+inline void
+digital_packet_sink::enter_have_header(int payload_len)
+{
+  if (VERBOSE)
+    fprintf(stderr, "@ enter_have_header (payload_len = %d)\n", payload_len);
+
+  d_state = STATE_HAVE_HEADER;
+  d_packetlen  = payload_len;
+  d_packetlen_cnt = 0;
+  d_packet_byte = 0;
+  d_packet_byte_index = 0;
+}
+
+digital_packet_sink_sptr
+digital_make_packet_sink (const std::vector<unsigned char>& sync_vector,
+			  gr_msg_queue_sptr target_queue, int threshold)
+{
+  return gnuradio::get_initial_sptr(new digital_packet_sink (sync_vector, target_queue, threshold));
+}
+
+
+digital_packet_sink::digital_packet_sink (const std::vector<unsigned char>& sync_vector,
+					  gr_msg_queue_sptr target_queue, int threshold)
+  : gr_sync_block ("packet_sink",
+		   gr_make_io_signature (1, 1, sizeof(float)),
+		   gr_make_io_signature (0, 0, 0)),
+    d_target_queue(target_queue), d_threshold(threshold == -1 ? DEFAULT_THRESHOLD : threshold)
+{
+  d_sync_vector = 0;
+  for(int i=0;i<8;i++){
+    d_sync_vector <<= 8;
+    d_sync_vector |= sync_vector[i];
+  }
+
+  enter_search();
+}
+
+digital_packet_sink::~digital_packet_sink ()
+{
+}
+
+int
+digital_packet_sink::work (int noutput_items,
+			   gr_vector_const_void_star &input_items,
+			   gr_vector_void_star &output_items)
+{
+  float *inbuf = (float *) input_items[0];
+  int count=0;
+
+  if (VERBOSE)
+    fprintf(stderr,">>> Entering state machine\n"),fflush(stderr);
+
+  while (count<noutput_items) {
+    switch(d_state) {
+
+    case STATE_SYNC_SEARCH:    // Look for sync vector
+      if (VERBOSE)
+	fprintf(stderr,"SYNC Search, noutput=%d\n",noutput_items),fflush(stderr);
+
+      while (count < noutput_items) {
+	if(slice(inbuf[count++]))
+	  d_shift_reg = (d_shift_reg << 1) | 1;
+	else
+	  d_shift_reg = d_shift_reg << 1;
+
+	// Compute popcnt of putative sync vector
+	if(gr_count_bits64 (d_shift_reg ^ d_sync_vector) <= d_threshold) {
+	  // Found it, set up for header decode
+	  enter_have_sync();
+	  break;
+	}
+      }
+      break;
+
+    case STATE_HAVE_SYNC:
+      if (VERBOSE)
+	fprintf(stderr,"Header Search bitcnt=%d, header=0x%08x\n", d_headerbitlen_cnt, d_header),
+	  fflush(stderr);
+
+      while (count < noutput_items) {		// Shift bits one at a time into header
+	if(slice(inbuf[count++]))
+	  d_header = (d_header << 1) | 1;
+	else
+	  d_header = d_header << 1;
+
+	if (++d_headerbitlen_cnt == HEADERBITLEN) {
+
+	  if (VERBOSE)
+	    fprintf(stderr, "got header: 0x%08x\n", d_header);
+
+	  // we have a full header, check to see if it has been received properly
+	  if (header_ok()){
+	    int payload_len = header_payload_len();
+	    if (payload_len <= MAX_PKT_LEN)		// reasonable?
+	      enter_have_header(payload_len);		// yes.
+	    else
+	      enter_search();				// no.
+	  }
+	  else
+	    enter_search();				// no.
+	  break;			// we're in a new state
+	}
+      }
+      break;
+
+    case STATE_HAVE_HEADER:
+      if (VERBOSE)
+	fprintf(stderr,"Packet Build\n"),fflush(stderr);
+
+      while (count < noutput_items) {   // shift bits into bytes of packet one at a time
+	if(slice(inbuf[count++]))
+	  d_packet_byte = (d_packet_byte << 1) | 1;
+	else
+	  d_packet_byte = d_packet_byte << 1;
+
+	if (d_packet_byte_index++ == 7) {	  	// byte is full so move to next byte
+	  d_packet[d_packetlen_cnt++] = d_packet_byte;
+	  d_packet_byte_index = 0;
+
+	  if (d_packetlen_cnt == d_packetlen){		// packet is filled
+
+	    // build a message
+	    gr_message_sptr msg = gr_make_message(0, 0, 0, d_packetlen_cnt);
+	    memcpy(msg->msg(), d_packet, d_packetlen_cnt);
+
+	    d_target_queue->insert_tail(msg);		// send it
+	    msg.reset();  				// free it up
+
+	    enter_search();
+	    break;
+	  }
+	}
+      }
+      break;
+
+    default:
+      assert(0);
+
+    } // switch
+
+  }   // while
+
+  return noutput_items;
+}
+