From 362d45bb829a9b190586cca79717cc175f4d06d2 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Thu, 19 Apr 2012 16:29:39 -0400
Subject: 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.
---
gr-digital/lib/digital_packet_sink.cc | 207 ++++++++++++++++++++++++++++++++++
1 file changed, 207 insertions(+)
create mode 100644 gr-digital/lib/digital_packet_sink.cc
(limited to 'gr-digital/lib/digital_packet_sink.cc')
diff --git a/gr-digital/lib/digital_packet_sink.cc b/gr-digital/lib/digital_packet_sink.cc
new file mode 100644
index 0000000000..92521376fd
--- /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;
+}
+
--
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