diff --git a/include/satnogs/lrpt_sync.h b/include/satnogs/lrpt_sync.h index 5ca30bc..603fcf2 100644 --- a/include/satnogs/lrpt_sync.h +++ b/include/satnogs/lrpt_sync.h @@ -1,678 +1,21 @@ /* -*- c++ -*- */ -/* GNU GENERAL PUBLIC LICENSE - * Version 3, 29 June 2007 - * - * Copyright (C) 2007 Free Software Foundation, Inc. - * Everyone is permitted to copy and distribute verbatim copies - * of this license document, but changing it is not allowed. - * - * Preamble - * - * The GNU General Public License is a free, copyleft license for - * software and other kinds of works. - * - * The licenses for most software and other practical works are designed - * to take away your freedom to share and change the works. By contrast, - * the GNU General Public License is intended to guarantee your freedom to - * share and change all versions of a program--to make sure it remains free - * software for all its users. 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Of course, your program's commands - * might be different; for a GUI interface, you would use an "about box". - * - * You should also get your employer (if you work as a programmer) or school, - * if any, to sign a "copyright disclaimer" for the program, if necessary. - * For more information on this, and how to apply and follow the GNU GPL, see - * . - * - * The GNU General Public License does not permit incorporating your program - * into proprietary programs. If your program is a subroutine library, you - * may consider it more useful to permit linking proprietary applications with - * the library. If this is what you want to do, use the GNU Lesser General - * Public License instead of this License. But first, please read - * . +/* + * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module + * + * Copyright (C) 2018, Libre Space Foundation + * + * This program 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 of the License, or + * (at your option) any later version. + * + * This program 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 program. If not, see . */ #ifndef INCLUDED_SATNOGS_LRPT_SYNC_H diff --git a/lib/lrpt_sync_impl.cc b/lib/lrpt_sync_impl.cc index 749340e..ddbf7fe 100644 --- a/lib/lrpt_sync_impl.cc +++ b/lib/lrpt_sync_impl.cc @@ -56,7 +56,10 @@ lrpt_sync_impl::lrpt_sync_impl (size_t threshold) : * sync word */ d_window((72 + 8)/2), + /* Each CADU has the 4 byte ASM and a VCDU of 1020 bytes*/ + d_coded_cadu_len((4 + 1020) * 2), d_frame_sync(false), + d_received(0), d_rotate(1, 0), d_qpsk(digital::constellation_qpsk::make()), d_shift_reg0(0x0), @@ -64,7 +67,6 @@ lrpt_sync_impl::lrpt_sync_impl (size_t threshold) : d_shift_reg2(0x0), d_shift_reg3(0x0) { - set_output_multiple(d_window); const int alignment_multiple = volk_get_alignment () / sizeof(gr_complex); set_alignment (std::max (1, alignment_multiple)); @@ -85,6 +87,18 @@ lrpt_sync_impl::lrpt_sync_impl (size_t threshold) : volk_free(d_rotate_2pi2); throw std::runtime_error("lrpt_sync: Could not allocate memory"); } + + d_corrected = (gr_complex *)volk_malloc(d_window, volk_get_alignment ()); + if(!d_corrected) { + volk_free(d_rotate_pi2); + volk_free(d_rotate_2pi2); + volk_free(d_rotate_3pi2); + throw std::runtime_error("lrpt_sync: Could not allocate memory"); + } + + d_coded_cadu = new uint8_t[(4 + 1020) * 2]; + /* Copy the coded ASM in front */ + memcpy(d_coded_cadu, &d_asm_coded, sizeof(uint64_t)); } /* @@ -95,6 +109,8 @@ lrpt_sync_impl::~lrpt_sync_impl () volk_free (d_rotate_pi2); volk_free (d_rotate_2pi2); volk_free (d_rotate_3pi2); + volk_free (d_corrected); + delete [] d_coded_cadu; } bool @@ -127,6 +143,7 @@ lrpt_sync_impl::work_no_sync(const gr_complex *in, int noutput_items) if(found_sync(d_shift_reg0)) { d_rotate = gr_complex(1.0, 0); d_frame_sync = true; + d_received = sizeof(uint64_t); return i * d_window + j; } @@ -135,6 +152,7 @@ lrpt_sync_impl::work_no_sync(const gr_complex *in, int noutput_items) if(found_sync(d_shift_reg1)) { d_rotate = gr_complex(0.0, 1.0); d_frame_sync = true; + d_received = sizeof(uint64_t); return i * d_window + j; } @@ -143,6 +161,7 @@ lrpt_sync_impl::work_no_sync(const gr_complex *in, int noutput_items) if(found_sync(d_shift_reg2)) { d_rotate = gr_complex(-1.0, 0); d_frame_sync = true; + d_received = sizeof(uint64_t); return i * d_window + j; } @@ -151,6 +170,7 @@ lrpt_sync_impl::work_no_sync(const gr_complex *in, int noutput_items) if(found_sync(d_shift_reg3)) { d_rotate = gr_complex(0.0, -1.0); d_frame_sync = true; + d_received = sizeof(uint64_t); return i * d_window + j; } } @@ -161,6 +181,31 @@ lrpt_sync_impl::work_no_sync(const gr_complex *in, int noutput_items) int lrpt_sync_impl::work_sync(const gr_complex *in, int noutput_items) { + uint8_t b; + int multiple = noutput_items / d_window; + for(int i = 0; i < multiple; i++) { + volk_32fc_s32fc_multiply_32fc(d_corrected, in + i * d_window, + d_rotate, d_window); + /* + * Skip UW, for now + * NOTE: UW is unencoded + */ + for(int j = 0; j < d_window - 4; j += 4) { + b = 0; + b = d_qpsk->decision_maker(d_corrected + j) << 6; + b |= d_qpsk->decision_maker(d_corrected + j + 1) << 4; + b |= d_qpsk->decision_maker(d_corrected + j + 2) << 2; + b |= d_qpsk->decision_maker(d_corrected + j + 3); + + d_coded_cadu[d_received++] = b; + if(d_received == d_coded_cadu_len) { + LOG_ERROR("frame"); + d_received = 0; + d_frame_sync = false; + return i * d_window + j + 4; + } + } + } return noutput_items; } diff --git a/lib/lrpt_sync_impl.h b/lib/lrpt_sync_impl.h index 60a5c55..d93aa02 100644 --- a/lib/lrpt_sync_impl.h +++ b/lib/lrpt_sync_impl.h @@ -1,678 +1,21 @@ /* -*- c++ -*- */ -/* GNU GENERAL PUBLIC LICENSE - * Version 3, 29 June 2007 - * - * Copyright (C) 2007 Free Software Foundation, Inc. - * Everyone is permitted to copy and distribute verbatim copies - * of this license document, but changing it is not allowed. - * - * Preamble - * - * The GNU General Public License is a free, copyleft license for - * software and other kinds of works. - * - * The licenses for most software and other practical works are designed - * to take away your freedom to share and change the works. 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But first, please read - * . +/* + * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module + * + * Copyright (C) 2018, Libre Space Foundation + * + * This program 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 of the License, or + * (at your option) any later version. + * + * This program 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 program. If not, see . */ #ifndef INCLUDED_SATNOGS_LRPT_SYNC_IMPL_H @@ -703,7 +46,9 @@ private: const uint64_t d_asm_coded_len; const uint64_t d_asm_coded_mask; const int d_window; + const size_t d_coded_cadu_len; bool d_frame_sync; + size_t d_received; gr_complex d_rotate; digital::constellation_qpsk::sptr d_qpsk; uint64_t d_shift_reg0; @@ -713,6 +58,8 @@ private: gr_complex* d_rotate_pi2; gr_complex* d_rotate_2pi2; gr_complex* d_rotate_3pi2; + gr_complex* d_corrected; + uint8_t* d_coded_cadu; int work_no_sync(const gr_complex *in, int noutput_items);