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Diffstat (limited to 'src/ofdm_get_test_bits.c')
| -rw-r--r-- | src/ofdm_get_test_bits.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/ofdm_get_test_bits.c b/src/ofdm_get_test_bits.c new file mode 100644 index 0000000..c13c410 --- /dev/null +++ b/src/ofdm_get_test_bits.c @@ -0,0 +1,161 @@ +/*---------------------------------------------------------------------------*\ + + FILE........: ofdm_get_test_bits.c + AUTHOR......: David Rowe + DATE CREATED: Mar 2018 + + Generate input for the OFDM modem in either coded or uncoded mode. + +\*---------------------------------------------------------------------------*/ + +/* + Copyright (C) 2018 David Rowe + + All rights reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License version 2.1, as + published by the Free Software Foundation. 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 Lesser General Public License + along with this program; if not, see <http://www.gnu.org/licenses/>. +*/ + +#define OPTPARSE_IMPLEMENTATION +#define OPTPARSE_API static +#include "optparse.h" + +#include <assert.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <math.h> +#include <errno.h> + +#include "codec2_ofdm.h" +#include "ofdm_internal.h" +#include "ldpc_codes.h" +#include "interldpc.h" +#include "varicode.h" + +#define IS_DIR_SEPARATOR(c) ((c) == '/') + +static const char *progname; + +void opt_help() { + fprintf(stderr, "\nUsage: %s [options]\n\n", progname); + fprintf(stderr, " --out filename Name of OutputOneCharPerBitFile\n"); + fprintf(stderr, " --frames n Number of frames to output (default 10)\n"); + fprintf(stderr, " --length n Frame length in bits (default 238)\n"); + fprintf(stderr, " --bcb Insert burst control byte at the start of each frame (FSK_LDPC testing)\n"); + fprintf(stderr, " --verbose Output variable assigned values to stderr\n\n"); + + exit(-1); +} + +int main(int argc, char *argv[]) +{ + FILE *fout; + char *fout_name = NULL; + int opt, verbose, n; + int Nframes, output_specified, bcb_en; + int Ndatabitsperpacket; + uint8_t burst_control; + + char *pn = argv[0] + strlen (argv[0]); + + while (pn != argv[0] && !IS_DIR_SEPARATOR (pn[-1])) + --pn; + + progname = pn; + + /* Turn off stream buffering */ + + setvbuf(stdout, NULL, _IONBF, BUFSIZ); + + fout = stdout; + output_specified = 0; + Nframes = 10; + Ndatabitsperpacket = 224; + verbose = 0; + bcb_en = 0; + + struct optparse options; + + struct optparse_long longopts[] = { + {"bcb", 'b', OPTPARSE_NONE}, + {"out", 'o', OPTPARSE_REQUIRED}, + {"frames", 'n', OPTPARSE_REQUIRED}, + {"length", 'l', OPTPARSE_REQUIRED}, + {"verbose", 'v', OPTPARSE_NONE}, + {0, 0, 0} + }; + + optparse_init(&options, argv); + + while ((opt = optparse_long(&options, longopts, NULL)) != -1) { + switch (opt) { + case '?': + opt_help(); + case 'b': + bcb_en = 1; + break; + case 'o': + fout_name = options.optarg; + output_specified = 1; + break; + case 'n': + Nframes = atoi(options.optarg); + break; + case 'l': + Ndatabitsperpacket = atoi(options.optarg); + break; + case 'v': + verbose = 1; + } + } + + /* Print remaining arguments to give user a hint */ + + char *arg; + + while ((arg = optparse_arg(&options))) + fprintf(stderr, "%s\n", arg); + + if (output_specified) { + if ((fout = fopen(fout_name, "wb")) == NULL) { + fprintf(stderr, "Error opening output bit file: %s\n", fout_name); + exit(-1); + } + } + + if (verbose) + fprintf(stderr, "Nframes: %d Ndatabitsperframe: %d bcb: %d\n", Nframes, Ndatabitsperpacket, bcb_en); + + uint8_t data_bits[Ndatabitsperpacket]; + ofdm_generate_payload_data_bits(data_bits, Ndatabitsperpacket); + + burst_control = 1; + for (n = 0; n<Nframes; n++) { + if (bcb_en) fwrite(&burst_control, 1, 1, fout); + fwrite(data_bits, sizeof(char), Ndatabitsperpacket, fout); + burst_control = 0; + } + if (bcb_en) { + // dummy end frame just to signal end of burst + burst_control = 2; + fwrite(&burst_control, 1, 1, fout); + memset(data_bits, 0, Ndatabitsperpacket); + fwrite(data_bits, sizeof(char), Ndatabitsperpacket, fout); + } + + if (output_specified) + fclose(fout); + + return 0; +} + |