diff options
Diffstat (limited to 'gr-pager')
| -rw-r--r-- | gr-pager/AUTHORS | 1 | ||||
| -rw-r--r-- | gr-pager/Makefile.am | 26 | ||||
| -rw-r--r-- | gr-pager/README | 38 | ||||
| -rw-r--r-- | gr-pager/src/Makefile.am | 109 | ||||
| -rw-r--r-- | gr-pager/src/__init__.py | 25 | ||||
| -rw-r--r-- | gr-pager/src/flex_demod.py | 57 | ||||
| -rw-r--r-- | gr-pager/src/pager.i | 61 | ||||
| -rw-r--r-- | gr-pager/src/pager_flex_deframer.cc | 324 | ||||
| -rw-r--r-- | gr-pager/src/pager_flex_deframer.h | 95 | ||||
| -rw-r--r-- | gr-pager/src/pager_slicer_fb.cc | 100 | ||||
| -rw-r--r-- | gr-pager/src/pager_slicer_fb.h | 58 | ||||
| -rw-r--r-- | gr-pager/src/pageri_bch3221.cc | 31 | ||||
| -rw-r--r-- | gr-pager/src/pageri_bch3221.h | 31 | ||||
| -rw-r--r-- | gr-pager/src/pageri_flex_modes.cc | 33 | ||||
| -rw-r--r-- | gr-pager/src/pageri_flex_modes.h | 45 | ||||
| -rwxr-xr-x | gr-pager/src/qa_pager.py | 35 | ||||
| -rw-r--r-- | gr-pager/src/run_tests.in | 10 | ||||
| -rwxr-xr-x | gr-pager/src/usrp_flex.py | 162 |
18 files changed, 1241 insertions, 0 deletions
diff --git a/gr-pager/AUTHORS b/gr-pager/AUTHORS new file mode 100644 index 000000000..cdb61c9f1 --- /dev/null +++ b/gr-pager/AUTHORS @@ -0,0 +1 @@ +Johnathan Corgan <jcorgan@aeinet.com> diff --git a/gr-pager/Makefile.am b/gr-pager/Makefile.am new file mode 100644 index 000000000..a9fc0d490 --- /dev/null +++ b/gr-pager/Makefile.am @@ -0,0 +1,26 @@ +# +# Copyright 2006 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 2, 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 $(top_srcdir)/Makefile.common + +SUBDIRS = src + +MOSTLYCLEANFILES = *~ *.tmp
\ No newline at end of file diff --git a/gr-pager/README b/gr-pager/README new file mode 100644 index 000000000..f898d7ae0 --- /dev/null +++ b/gr-pager/README @@ -0,0 +1,38 @@ +This GNU Radio component implements (will implement) common radiopager +signaling protocols such as POCSAG and FLEX. + +Current status (9/13/06): + +FLEX receiving is in mid-stream of implemention. + +pager.slicer_fb() Accepts a complex baseband downconverted channel + and outputs 4-level FSK symbols [0-3] as bytes. + This may migrate into gnuradio-core at some point. + +pager.flex_deframer() Accepts a symbol stream from slicer_fb() and + outputs received 32-bit FLEX codewords for each + defined phase. Auto adjusts for 1600 or 3200 bps, + and 2 or 4 level FSK encoding based on received + synchronization word. The sync portion of this + block may factor out into its own block for + purposes of clarity and code complexity. + +pager.bch3221_ecd() (not yet implemented) Accepts a stream of 32-bit + FLEX codewords and applies BCH (32,21) error + detection/correction (up to 2 bits), the emits + corrected stream. This may be absorbed into the + deframer at some point. + +pager.message_decode() (not yet implemented) Accepts a stream of 32-bit + FLEX codewords and separates individual paging + messages into output stream as bytes. + +pager.flex_decode() Combines the above blocks correctly to convert + from downconverted baseband to pager messages + +usrp_flex.py Instantiates USRP receive chain to receive FLEX + protocol pages. See command-line help for options. + This will probably make it into gnuradio-examples. + +Johnathan Corgan +jcorgan@aeinet.com diff --git a/gr-pager/src/Makefile.am b/gr-pager/src/Makefile.am new file mode 100644 index 000000000..7438d2384 --- /dev/null +++ b/gr-pager/src/Makefile.am @@ -0,0 +1,109 @@ +# +# Copyright 2004,2005,2006 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 2, 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 $(top_srcdir)/Makefile.common + +EXTRA_DIST = \ + run_tests.in + +TESTS = \ + run_tests + +noinst_PYTHON = \ + qa_pager.py + +# Install this stuff so that it ends up as the gnuradio.pgr module +# This usually ends up at: +# ${prefix}/lib/python${python_version}/site-packages/gnuradio/pager + +ourpythondir = $(grpythondir)/pager +ourlibdir = $(grpyexecdir)/pager + +INCLUDES = $(STD_DEFINES_AND_INCLUDES) $(PYTHON_CPPFLAGS) + +SWIGPYTHONARGS = $(SWIGPYTHONFLAGS) $(STD_DEFINES_AND_INCLUDES) + +ALL_IFILES = \ + $(LOCAL_IFILES) \ + $(NON_LOCAL_IFILES) + +NON_LOCAL_IFILES = \ + $(GNURADIO_I) + +LOCAL_IFILES = \ + $(top_srcdir)/gr-pager/src/pager.i + +# These files are built by SWIG. The first is the C++ glue. +# The second is the python wrapper that loads the _howto shared library +# and knows how to call our extensions. + +BUILT_SOURCES = \ + pager_swig.cc \ + pager_swig.py + +# This gets pgr.py installed in the right place +ourpython_PYTHON = \ + __init__.py \ + pager_swig.py \ + flex_demod.py \ + usrp_flex.py + +ourlib_LTLIBRARIES = _pager_swig.la + +# These are the source files that go into the shared library +_pager_swig_la_SOURCES = \ + pager_swig.cc \ + pager_slicer_fb.cc \ + pager_flex_deframer.cc \ + pageri_flex_modes.cc \ + pageri_bch3221.cc + # Additional source modules here + +# magic flags +_pager_swig_la_LDFLAGS = $(NO_UNDEFINED) -module -avoid-version + +# link the library against the c++ standard library +_pager_swig_la_LIBADD = \ + $(PYTHON_LDFLAGS) \ + $(GNURADIO_CORE_LIBS) \ + -lstdc++ + +pager_swig.cc pager_swig.py: $(ALL_IFILES) + $(SWIG) $(SWIGPYTHONARGS) -module pager_swig -o pager_swig.cc $(LOCAL_IFILES) + +# These headers get installed in ${prefix}/include/gnuradio +grinclude_HEADERS = \ + pager_slicer_fb.h \ + pager_flex_deframer.h \ + pageri_flex_modes.h \ + pageri_bch3221.h + # Additional header files here + +# These swig headers get installed in ${prefix}/include/gnuradio/swig +swiginclude_HEADERS = \ + $(LOCAL_IFILES) + +MOSTLYCLEANFILES = $(BUILT_SOURCES) *.pyc *~ *.tmp + +# Don't distribute output of swig +dist-hook: + @for file in $(BUILT_SOURCES); do echo $(RM) $(distdir)/$$file; done + @for file in $(BUILT_SOURCES); do $(RM) $(distdir)/$$file; done diff --git a/gr-pager/src/__init__.py b/gr-pager/src/__init__.py new file mode 100644 index 000000000..cf0edaa96 --- /dev/null +++ b/gr-pager/src/__init__.py @@ -0,0 +1,25 @@ +# +# Copyright 2006 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 2, 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. +# + +# The presence of this file turns this directory into a Python package + +from pager_swig import * +from flex_demod import flex_demod diff --git a/gr-pager/src/flex_demod.py b/gr-pager/src/flex_demod.py new file mode 100644 index 000000000..8326c9fa5 --- /dev/null +++ b/gr-pager/src/flex_demod.py @@ -0,0 +1,57 @@ +# +# Copyright 2006 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 2, 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. +# + +from gnuradio import gr, optfir +from math import pi +import pager_swig + +class flex_demod(gr.hier_block): + """ + FLEX protocol demodulation block. + + This block demodulates a band-limited, complex down-converted baseband + channel into FLEX protocol frames. + + Flow graph (so far): + + QUAD - Quadrature demodulator converts FSK to baseband amplitudes + LPF - Low pass filter to remove noise prior to slicer + SLICER - Converts input to one of four symbols (0, 1, 2, 3) + DEFRAMER - Syncronizes symbol stream and outputs FLEX codewords + --- + + @param fg: flowgraph + @param channel_rate: incoming sample rate of the baseband channel + @type sample_rate: integer + """ + + def __init__(self, fg, channel_rate): + k = channel_rate/(2*pi*4800) # 4800 Hz max deviation + QUAD = gr.quadrature_demod_cf(k) + + taps = optfir.low_pass(1.0, channel_rate, 3200, 6400, 0.1, 60) + LPF = gr.fir_filter_fff(1, taps) + SLICER = pager_swig.slicer_fb(.001, .00001) # Attack, decay + DEFRAMER = pager_swig.flex_deframer(channel_rate) + + fg.connect(QUAD, LPF, SLICER, DEFRAMER) + + gr.hier_block.__init__(self, fg, QUAD, DEFRAMER) diff --git a/gr-pager/src/pager.i b/gr-pager/src/pager.i new file mode 100644 index 000000000..1e14af085 --- /dev/null +++ b/gr-pager/src/pager.i @@ -0,0 +1,61 @@ +/* + * Copyright 2005,2006 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 2, 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. + */ + +%feature("autodoc","1"); +%include "exception.i" +%import "gnuradio.i" + +%{ +#include "gnuradio_swig_bug_workaround.h" // mandatory bug fix +#include "pager_slicer_fb.h" +#include "pager_flex_deframer.h" +#include <stdexcept> +%} + +// ---------------------------------------------------------------- + +GR_SWIG_BLOCK_MAGIC(pager,slicer_fb); + +pager_slicer_fb_sptr pager_make_slicer_fb(float alpha, float beta); + +class pager_slicer_fb : public gr_sync_block +{ +private: + pager_slicer_fb(float alpha, float beta); + +public: +}; + +// ---------------------------------------------------------------- + +GR_SWIG_BLOCK_MAGIC(pager,flex_deframer); + +pager_flex_deframer_sptr pager_make_flex_deframer(int rate); + +class pager_flex_deframer : public gr_block +{ +private: + pager_flex_deframer(int rate); + +public: +}; + +// ---------------------------------------------------------------- diff --git a/gr-pager/src/pager_flex_deframer.cc b/gr-pager/src/pager_flex_deframer.cc new file mode 100644 index 000000000..1f8c90209 --- /dev/null +++ b/gr-pager/src/pager_flex_deframer.cc @@ -0,0 +1,324 @@ +/* + * Copyright 2004,2006 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 2, 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 <pager_flex_deframer.h> +#include <pageri_flex_modes.h> +#include <gr_io_signature.h> +#include <gr_count_bits.h> + +pager_flex_deframer_sptr pager_make_flex_deframer(int rate) +{ + return pager_flex_deframer_sptr(new pager_flex_deframer(rate)); +} + +// FLEX deframer block takes input from symbol stream with alphabet [0, 1, 2, 3] +// at specified channel rate and and outputs deinterleaved 32-bit FLEX code words +// at 50, 100, or 200 code words per second (based on detected mode in sync +// word). + +pager_flex_deframer::pager_flex_deframer(int rate) : + gr_block ("flex_deframer", + gr_make_io_signature (1, 1, sizeof(unsigned char)), + gr_make_io_signature (1, 1, sizeof(gr_int32))), + d_sync(rate/1600) // Maximum samples per baud +{ + d_rate = rate; + set_output_multiple(1); + enter_idle(); +} + +void pager_flex_deframer::forecast(int noutput_items, gr_vector_int &inputs_required) +{ + // samples per bit X 32 bits * number of outputs needed + int items = noutput_items*sizeof(gr_int32)*8*d_spb; + for (unsigned int i = 0; i < inputs_required.size(); i++) + inputs_required[i] = items; +} + +int pager_flex_deframer::index_avg(int start, int end) +{ + // modulo average + if (start < end) + return (end + start)/2; + else + return ((end + start)/2 + d_spb/2) % d_spb; +} + +bool pager_flex_deframer::test_sync(unsigned char sym) +{ + // 64-bit FLEX sync code: + // AAAA:BBBBBBBB:CCCC + // + // Where BBBBBBBB is always 0xA6C6AAAA + // and AAAA^CCCC is 0xFFFF + // + // Specific values of AAAA determine what bps and encoding the + // packet is beyond the frame information word + // + // First we match on the marker field with a hamming distance < 4 + // Then we match on the outer code with a hamming distance < 4 + + d_sync[d_index] = (d_sync[d_index] << 1) | (sym < 2); + gr_int64 val = d_sync[d_index]; + gr_int32 marker = ((val & 0x0000FFFFFFFF0000ULL)) >> 16; + + if (gr_count_bits32(marker^FLEX_SYNC_MARKER) < 4) { + gr_int32 code = ((val & 0xFFFF000000000000ULL) >> 32) | + (val & 0x000000000000FFFFULL); + + for (int i = 0; i < num_flex_modes; i++) { + if (gr_count_bits32(code^flex_modes[i].sync) < 4) { + d_mode = i; + return true; + } + } + + // Marker received but doesn't match known codes + // All codes have high word inverted to low word + unsigned short high = (code & 0xFFFF0000) >> 16; + unsigned short low = code & 0x0000FFFF; + unsigned short syn = high^low; + if (syn == 0xFFFF) + fprintf(stderr, "Unknown sync code detected: %08X\n", code); + } + + return false; +} + +void pager_flex_deframer::enter_idle() +{ + d_state = ST_IDLE; + d_index = 0; + d_start = 0; + d_center = 0; + d_end = 0; + d_count = 0; + d_mode = 0; + d_baudrate = 1600; + d_levels = 2; + d_spb = d_rate/d_baudrate; + d_hibit = false; + d_cdi = 0; + d_cdw = 0; + d_blk = 0; +} + +void pager_flex_deframer::enter_syncing() +{ + d_start = d_index; + d_state = ST_SYNCING; +} + +void pager_flex_deframer::enter_sync1() +{ + d_state = ST_SYNC1; + d_end = d_index; + d_center = index_avg(d_start, d_end); + d_count = 0; + fprintf(stderr, "SYNC1=%08X\n", flex_modes[d_mode].sync); +} + +void pager_flex_deframer::enter_sync2() +{ + d_state = ST_SYNC2; + d_count = 0; + d_baudrate = flex_modes[d_mode].baud; + d_levels = flex_modes[d_mode].levels; + d_spb = d_rate/d_baudrate; + + if (d_baudrate == 3200) { + // Oversampling buffer just got halved + d_center = d_center/2; + d_index = d_index/2-d_spb/2; // We're here at the center of a 1600 baud bit + d_count = -1; // So this hack gets us in the right place for 3200 + } +} + +void pager_flex_deframer::enter_data() +{ + d_state = ST_DATA; + d_count = 0; +} + +void pager_flex_deframer::enter_output() +{ + d_state = ST_OUTPUT; + d_count = flex_modes[d_mode].phases*88; // Now d_count will count codewords, not bits + d_output_phase = 0; // Always phase A + d_output_index = 0; +} + +void pager_flex_deframer::accumulate_frames(unsigned char sym) +{ + // Bits are encoded with 2-bit gray code + // + // SYM Bit1 Bit2 + // --- ---- ---- + // 0 1 1 + // 1 1 0 + // 2 0 0 + // 3 0 1 + + // Codewords are interleaved in blocks of 8 + // + // ABCDEFGH + // ABCDEFGH + // ABCDEFGH + // ABCDEFGH + // ... + // etc., for all 32 bits. So each successive incoming bit is multiplexed + // into a different d_frames[][], indexed by d_cdw + + d_cdw = d_blk*8+d_cdi; + assert(d_cdw < 88); + + if (d_baudrate == 1600) { + d_frames[0][d_cdw] <<= 1; + d_frames[0][d_cdw] |= (sym < 2); + + if (d_levels == 4) { + d_frames[1][d_cdw] <<= 1; + d_frames[1][d_cdw] |= (sym == 0 || sym == 3); + } + } + else { + if (!d_hibit) { + d_frames[0][d_cdw] <<= 1; + d_frames[0][d_cdw] |= (sym < 2); + + if (d_levels == 4) { + d_frames[1][d_cdw] <<= 1; + d_frames[1][d_cdw] |= (sym == 0 || sym == 3); + } + d_hibit = true; + } + else { + d_frames[2][d_cdw] <<= 1; + d_frames[2][d_cdw] |= (sym < 2); + + if (d_levels == 4) { + d_frames[3][d_cdw] <<= 1; + d_frames[3][d_cdw] |= (sym == 0 || sym == 3); + } + d_hibit = false; + } + } + + d_cdi = ++d_cdi % 8; + if (++d_count % (d_baudrate*4/25) == 0) + d_blk++; +} + +int pager_flex_deframer::general_work(int noutput_items, + gr_vector_int &ninput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) +{ + const unsigned char *in = (const unsigned char *)input_items[0]; + gr_int32 *out = (gr_int32 *)output_items[0]; + + int i = 0, j = 0; + int ninputs = ninput_items[0]; + + while (i < ninputs && j < noutput_items) { + unsigned char sym = 0; + if (d_state != ST_OUTPUT) { + sym = *in++; i++; + d_index = ++d_index % d_spb; + } + + switch (d_state) { + case ST_IDLE: + if (test_sync(sym)) + enter_syncing(); + break; + + case ST_SYNCING: + if (!test_sync(sym)) { + enter_sync1(); + // Output sync code + *out++ = flex_modes[d_mode].sync; j++; + } + break; + + case ST_SYNC1: + if (d_index == d_center) { + d_sync[d_index] = (d_sync[d_index] << 1) | (sym < 2); + if (++d_count == 48) { // Skip 16 bits of dotting + // Output frame information word + *out++ = (gr_int32)(d_sync[d_index] & 0x00000000FFFFFFFFULL); j++; + enter_sync2(); + } + } + break; + + case ST_SYNC2: + if (d_index == d_center) { + // Skip 25 ms = 40 bits @ 1600 bps, 80 @ 3200 bps + if (++d_count == d_baudrate/40) + enter_data(); + } + break; + + case ST_DATA: + if (d_index == d_center) { + accumulate_frames(sym); + if (d_count == d_baudrate*1760/1000) + enter_output(); + } + break; + + case ST_OUTPUT: + output_codeword(out++); j++; + if (--d_count == 0) + enter_idle(); + break; + + default: + assert(0); // memory corruption of d_state if ever gets here + break; + + } + } + + consume_each(i); + return j; +} + +void pager_flex_deframer::output_codeword(gr_int32 *out) +{ + *out = d_frames[d_output_phase][d_output_index++]; + + if (d_output_index == 88) { + d_output_index = 0; + d_output_phase++; + if (d_output_phase == 1 && !flex_modes[d_mode].phase_b) + d_output_phase++; + if (d_output_phase == 2 && !flex_modes[d_mode].phase_c) + d_output_phase++; + if (d_output_phase == 3 && !flex_modes[d_mode].phase_d) + d_output_phase++; + } +} diff --git a/gr-pager/src/pager_flex_deframer.h b/gr-pager/src/pager_flex_deframer.h new file mode 100644 index 000000000..43e6ef7b7 --- /dev/null +++ b/gr-pager/src/pager_flex_deframer.h @@ -0,0 +1,95 @@ +/* + * Copyright 2006 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 2, 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. + */ + +#ifndef INCLUDED_PAGER_FLEX_DEFRAMER_H +#define INCLUDED_PAGER_FLEX_DEFRAMER_H + +#include <gr_block.h> + +class pager_flex_deframer; +typedef boost::shared_ptr<pager_flex_deframer> pager_flex_deframer_sptr; +typedef std::vector<gr_int64> gr_int64_vector; + +pager_flex_deframer_sptr pgr_make_flex_deframer(int rate); + +/*! + * \brief flex deframer description + * \ingroup block + */ + +class pager_flex_deframer : public gr_block +{ +private: + // Constructors + friend pager_flex_deframer_sptr pager_make_flex_deframer(int rate); + pager_flex_deframer(int rate); + + // State machine transitions + void enter_idle(); + void enter_syncing(); + void enter_sync1(); + void enter_sync2(); + void enter_data(); + void enter_output(); + + int index_avg(int start, int end); + bool test_sync(unsigned char sym); + void accumulate_frames(unsigned char sym); + void output_codeword(gr_int32 *out); + + // Simple state machine + enum state_t { ST_IDLE, ST_SYNCING, ST_SYNC1, ST_SYNC2, ST_DATA, ST_OUTPUT }; + state_t d_state; + + int d_rate; // Incoming sample rate + int d_index; // Index into current baud + int d_start; // Start of good sync + int d_center; // Center of bit + int d_end; // End of good sync + int d_count; // Bit counter + + int d_mode; // Current packet mode + int d_baudrate; // Current decoding baud rate + int d_levels; // Current decoding levels + int d_spb; // Current samples per baud + bool d_hibit; // Current bit is high bit when 3200 baud + + gr_int64_vector d_sync; // Trial synchronizers + + int d_cdi; // 0-7 code word index for deinterleave + int d_cdw; // 0-87 code word index for frame + int d_blk; // 0-10 block index + + int d_output_phase; // Indexes d_frames[][] during output + int d_output_index; // indexes d_frames[][] during output + + gr_int32 d_frames[4][88]; // Frame accumulators for each phase + +public: + void forecast(int noutput_items, gr_vector_int &inputs_required); + + int general_work(int noutput_items, + gr_vector_int &ninput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items); +}; + +#endif /* INCLUDED_PAGER_FLEX_DEFRAMER_H */ diff --git a/gr-pager/src/pager_slicer_fb.cc b/gr-pager/src/pager_slicer_fb.cc new file mode 100644 index 000000000..98e8a2b00 --- /dev/null +++ b/gr-pager/src/pager_slicer_fb.cc @@ -0,0 +1,100 @@ +/* + * Copyright 2004,2006 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 2, 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 <pager_slicer_fb.h> +#include <gr_io_signature.h> + +pager_slicer_fb_sptr pager_make_slicer_fb(float alpha, float beta) +{ + return pager_slicer_fb_sptr(new pager_slicer_fb(alpha, beta)); +} + +pager_slicer_fb::pager_slicer_fb(float alpha, float beta) : + gr_sync_block ("slicer_fb", + gr_make_io_signature (1, 1, sizeof(float)), + gr_make_io_signature (1, 1, sizeof(unsigned char))) +{ + d_alpha = alpha; + d_beta = beta; + d_max = 0.0; + d_hi = 0.0; + d_avg = 0.0; + d_lo = 0.0; + d_min = 0.0; +} + +// Tracks average, minimum, and peak, then converts input into one of: +// +// [0, 1, 2, 3] +unsigned char pager_slicer_fb::slice(float sample) +{ + unsigned char decision; + + // Update DC level and remove + d_avg = d_avg*(1.0-d_alpha)+sample*d_alpha; + sample -= d_avg; + + if (sample > 0) { + if (sample > d_hi) { // In max region + d_max = d_max*(1.0-d_alpha) + sample*d_alpha; + decision = 3; + } + else { + d_max -= (d_max-d_avg)*d_beta; // decay otherwise + decision = 2; + } + } + else { + if (sample < d_lo) { // In min region + d_min = d_min*(1.0-d_alpha) + sample*d_alpha; + decision = 0; + } + else { + d_min -= (d_min-d_avg)*d_beta; // decay otherwise + decision = 1; + } + } + + d_hi = d_max*2.0/3.0; + d_lo = d_min*2.0/3.0; + + //fprintf(stderr, "%f %d\n", sample, decision); + return decision; +} + +int pager_slicer_fb::work(int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) +{ + float *iptr = (float *) input_items[0]; + unsigned char *optr = (unsigned char *) output_items[0]; + + int size = noutput_items; + + for (int i = 0; i < size; i++) + *optr++ = slice(*iptr++); + + return noutput_items; +} diff --git a/gr-pager/src/pager_slicer_fb.h b/gr-pager/src/pager_slicer_fb.h new file mode 100644 index 000000000..052cb8263 --- /dev/null +++ b/gr-pager/src/pager_slicer_fb.h @@ -0,0 +1,58 @@ +/* + * Copyright 2006 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 2, 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. + */ + +#ifndef INCLUDED_PAGER_SLICER_FB_H +#define INCLUDED_PAGER_SLICER_FB_H + +#include <gr_sync_block.h> + +class pager_slicer_fb; +typedef boost::shared_ptr<pager_slicer_fb> pager_slicer_fb_sptr; + +pager_slicer_fb_sptr pgr_make_slicer_fb(float alpha, float beta); + +/*! + * \brief slicer description + * \ingroup block + */ +class pager_slicer_fb : public gr_sync_block +{ +private: + friend pager_slicer_fb_sptr pager_make_slicer_fb(float alpha, float beta); + pager_slicer_fb(float alpha, float beta); + + unsigned char slice(float sample); + + float d_alpha; // Attack constant + float d_beta; // Decay constant + float d_max; // Maximum value for symbol comparison + float d_hi; // High side decision boundary + float d_avg; // Average value for DC offset subtraction + float d_lo; // Low side decision boundary + float d_min; // Minimum value for symbol comparison + +public: + int work (int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items); +}; + +#endif /* INCLUDED_PAGER_SLICER_FB_H */ diff --git a/gr-pager/src/pageri_bch3221.cc b/gr-pager/src/pageri_bch3221.cc new file mode 100644 index 000000000..7e2e28978 --- /dev/null +++ b/gr-pager/src/pageri_bch3221.cc @@ -0,0 +1,31 @@ +/* + * Copyright 2006 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 2, 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 <pageri_bch3221.h> + +int pageri_bch3221(gr_int32 &data) +{ + return 0; +} diff --git a/gr-pager/src/pageri_bch3221.h b/gr-pager/src/pageri_bch3221.h new file mode 100644 index 000000000..c4767b231 --- /dev/null +++ b/gr-pager/src/pageri_bch3221.h @@ -0,0 +1,31 @@ +/* + * Copyright 2006 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 2, 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. + */ + +#ifndef INCLUDED_PAGERI_BCH3221_H +#define INCLUDED_PAGERI_BCH3221_H + +#include <gr_types.h> + +// Perform BCH (32,21) error correction on supplied data +// Return number of errors found/corrected (0, 1, or 2) +int pageri_bch3221(gr_int32 &data); + +#endif /* INCLUDED_PAGERI_BCH3221_H */ diff --git a/gr-pager/src/pageri_flex_modes.cc b/gr-pager/src/pageri_flex_modes.cc new file mode 100644 index 000000000..a846643a7 --- /dev/null +++ b/gr-pager/src/pageri_flex_modes.cc @@ -0,0 +1,33 @@ +/* + * Copyright 2006 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 2, 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 "pageri_flex_modes.h" + +const flex_mode_t flex_modes[] = +{ + { 0x870C78F3, 1600, 2, true, false, false, false, 1 }, + { 0xB0684F97, 1600, 4, true, true, false, false, 2 }, +// { 0xUNKNOWN, 3200, 2, true, false, true, false, 2 }, + { 0xDEA0215F, 3200, 4, true, true, true, true, 4 }, + { 0x4C7CB383, 3200, 4, true, true, true, true, 4 } +}; + +const int num_flex_modes = sizeof(flex_modes); diff --git a/gr-pager/src/pageri_flex_modes.h b/gr-pager/src/pageri_flex_modes.h new file mode 100644 index 000000000..ab8b10683 --- /dev/null +++ b/gr-pager/src/pageri_flex_modes.h @@ -0,0 +1,45 @@ +/* + * Copyright 2006 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 2, 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. + */ + +#ifndef INCLUDED_PAGERI_FLEX_MODES_H +#define INCLUDED_PAGERI_FLEX_MODES_H + +#include <gr_types.h> + +#define FLEX_SYNC_MARKER 0xA6C6AAAA + +typedef struct flex_mode +{ + gr_int32 sync; // Outer synchronization code + unsigned int baud; // Baudrate of SYNC2 and DATA + unsigned int levels; // FSK encoding of SYNC2 and DATA + bool phase_a; // PHASEA is transmitted + bool phase_b; // PHASEB is transmitted + bool phase_c; // PHASEC is transmitted + bool phase_d; // PHASED is transmitted + int phases; // number of phases transmitted +} +flex_mode_t; + +extern const flex_mode_t flex_modes[]; +extern const int num_flex_modes; + +#endif // INCLUDED_PAGERI_FLEX_MODES_H diff --git a/gr-pager/src/qa_pager.py b/gr-pager/src/qa_pager.py new file mode 100755 index 000000000..5b9a3996c --- /dev/null +++ b/gr-pager/src/qa_pager.py @@ -0,0 +1,35 @@ +#!/usr/bin/env python +# +# Copyright 2004,2006 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 2, 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. +# + +from gnuradio import gr, gr_unittest +import pager_swig + +class qa_pgr(gr_unittest.TestCase): + + def setUp (self): + self.fg = gr.flow_graph () + + def tearDown (self): + self.fg = None + +if __name__ == '__main__': + gr_unittest.main () diff --git a/gr-pager/src/run_tests.in b/gr-pager/src/run_tests.in new file mode 100644 index 000000000..6bb0c3980 --- /dev/null +++ b/gr-pager/src/run_tests.in @@ -0,0 +1,10 @@ +#!/bin/sh + +# 1st parameter is absolute path to component source directory +# 2nd parameter is absolute path to component build directory +# 3rd parameter is path to Python QA directory + +@top_builddir@/run_tests.sh \ + @abs_top_srcdir@/gr-pager \ + @abs_top_builddir@/gr-pager \ + @srcdir@ diff --git a/gr-pager/src/usrp_flex.py b/gr-pager/src/usrp_flex.py new file mode 100755 index 000000000..ae455fde0 --- /dev/null +++ b/gr-pager/src/usrp_flex.py @@ -0,0 +1,162 @@ +#!/usr/bin/env python + +from gnuradio import gr, gru, usrp, optfir, eng_notation, blks +from gnuradio.eng_option import eng_option +from optparse import OptionParser +import time, os, sys + +from flex_demod import flex_demod + +""" +This example application demonstrates receiving and demodulating the +FLEX pager protocol. + +A receive chain is built up of the following signal processing +blocks: + +USRP - Daughter board source generating complex baseband signal. +CHAN - Low pass filter to select channel bandwidth +RFSQL - RF squelch zeroing output when input power below threshold +AGC - Automatic gain control leveling signal at [-1.0, +1.0] +FLEX - FLEX pager protocol decoder +SINK - File sink for decoded output + +The following are required command line parameters: + +-f FREQ USRP receive frequency + +The following are optional command line parameters: + +-R SUBDEV Daughter board specification, defaults to first found +-c FREQ Calibration offset. Gets added to receive frequency. + Defaults to 0.0 Hz. +-g GAIN Daughterboard gain setting. Defaults to mid-range. +-r RFSQL RF squelch in db. Defaults to -50.0. + +Once the program is running, ctrl-break (Ctrl-C) stops operation. +""" + +def make_filename(dir, freq): + t = time.strftime('%Y%m%d-%H%M%S') + f = 'r%s-%s.dat' % (t, eng_notation.num_to_str(freq)) + return os.path.join(dir, f) + +class usrp_source_c(gr.hier_block): + """ + Create a USRP source object supplying complex floats. + + Selects user supplied subdevice or chooses first available one. + + Calibration value is the offset from the tuned frequency to + the actual frequency. + """ + def __init__(self, fg, subdev_spec, decim, gain=None, calibration=0.0): + self._decim = decim + self._src = usrp.source_c() + if subdev_spec is None: + subdev_spec = usrp.pick_rx_subdevice(self._src) + self._subdev = usrp.selected_subdev(self._src, subdev_spec) + self._src.set_mux(usrp.determine_rx_mux_value(self._src, subdev_spec)) + self._src.set_decim_rate(self._decim) + + # If no gain specified, set to midrange + if gain is None: + g = self._subdev.gain_range() + gain = (g[0]+g[1])/2.0 + + self._subdev.set_gain(gain) + self._cal = calibration + + gr.hier_block.__init__(self, fg, self._src, self._src) + + def tune(self, freq): + result = usrp.tune(self._src, 0, self._subdev, freq+self._cal) + # TODO: deal with residual + + def rate(self): + return self._src.adc_rate()/self._decim + +class app_flow_graph(gr.flow_graph): + def __init__(self, options, args): + gr.flow_graph.__init__(self) + self.options = options + self.args = args + + USRP = usrp_source_c(self, # Flow graph + options.rx_subdev_spec, # Daugherboard spec + 250, # IF decimation ratio gets 256K if_rate + options.gain, # Receiver gain + options.calibration) # Frequency offset + USRP.tune(options.frequency) + + if_rate = USRP.rate() + channel_rate = 32000 # Oversampled by 10 or 20 + channel_decim = if_rate // channel_rate + + CHAN_taps = optfir.low_pass(1.0, # Filter gain + if_rate, # Sample rate + 8000, # One sided modulation bandwidth + 10000, # One sided channel bandwidth + 0.1, # Passband ripple + 60) # Stopband attenuation + + CHAN = gr.freq_xlating_fir_filter_ccf(channel_decim, # Decimation rate + CHAN_taps, # Filter taps + 0.0, # Offset frequency + if_rate) # Sample rate + + RFSQL = gr.pwr_squelch_cc(options.rf_squelch, # Power threshold + 125.0/channel_rate, # Time constant + channel_rate/20, # 50ms rise/fall + False) # Zero, not gate output + + AGC = gr.agc_cc(1.0/channel_rate, # Time constant + 1.0, # Reference power + 1.0, # Initial gain + 1.0) # Maximum gain + + FLEX = flex_demod(self, 32000) + + SINK = gr.file_sink(4, options.filename) + + self.connect(USRP, CHAN) + self.connect(CHAN, RFSQL) + self.connect(RFSQL, AGC) + self.connect(AGC, FLEX) + self.connect(FLEX, SINK) + +def main(): + parser = OptionParser(option_class=eng_option) + parser.add_option("-f", "--frequency", type="eng_float", + help="set receive frequency to Hz", metavar="Hz") + parser.add_option("-R", "--rx-subdev-spec", type="subdev", + help="select USRP Rx side A or B", metavar="SUBDEV") + parser.add_option("-c", "--calibration", type="eng_float", default=0.0, + help="set frequency offset to Hz", metavar="Hz") + parser.add_option("-g", "--gain", type="int", default=None, + help="set RF gain", metavar="dB") + parser.add_option("-r", "--rf-squelch", type="eng_float", default=-50.0, + help="set RF squelch to dB", metavar="dB") + parser.add_option("-F", "--filename", default=None) + parser.add_option("-D", "--dir", default=None) + (options, args) = parser.parse_args() + + if options.frequency < 1e6: + options.frequency *= 1e6 + + if options.filename is None and options.dir is None: + sys.stderr.write('Must specify either -F FILENAME or -D DIR\n') + parser.print_help() + sys.exit(1) + + if options.filename is None: + options.filename = make_filename(options.dir, options.frequency) + + fg = app_flow_graph(options, args) + try: + fg.run() + except KeyboardInterrupt: + pass + +if __name__ == "__main__": + main() |