FreeCalypso > hg > gsm-codec-lib

annotate dev/efr-sid-insert.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents 3b5958f28a40
children
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3b5958f28a40 dev: efr-sid-insert helper program
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * We need to implement a function that inserts the 95 bit wide SID
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3 * codeword into the frame, and we would like to do it more efficiently
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4 * than calling a "set bit" function for each of the 95 bits. This
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5 * program will produce a more efficient solution.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12
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13 static const uint8_t SID_codeword_bit_idx[95] =
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14 {
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15 45, 46, 48, 49, 50, 51, 52, 53, 54, 55,
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16 56, 57, 58, 59, 60, 61, 62, 63, 64, 65,
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17 66, 67, 68, 94, 95, 96, 98, 99, 100, 101,
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18 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
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19 112, 113, 114, 115, 116, 117, 118, 148, 149, 150,
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20 151, 152, 153, 154, 155, 156, 157, 158, 159, 160,
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21 161, 162, 163, 164, 165, 166, 167, 168, 169, 170,
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22 171, 196, 197, 198, 199, 200, 201, 202, 203, 204,
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23 205, 206, 207, 208, 209, 212, 213, 214, 215, 216,
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24 217, 218, 219, 220, 221
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25 };
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27 static void set_bit(uint8_t *frame, unsigned bitnum)
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28 {
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29 unsigned bytenum = bitnum >> 3;
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30 unsigned bit_in_byte = 7 - (bitnum & 7);
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31 unsigned bitmask = 1 << bit_in_byte;
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32
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33 frame[bytenum] |= bitmask;
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34 }
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35
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36 main(argc, argv)
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37 char **argv;
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38 {
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39 uint8_t bytes[31];
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40 unsigned n;
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41
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42 memset(bytes, 0, 31);
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43 for (n = 0; n < 95; n++)
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44 set_bit(bytes, SID_codeword_bit_idx[n] + 4);
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45 for (n = 0; n < 31; n++)
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46 if (bytes[n])
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47 printf("\tframe[%u] |= 0x%02X;\n", n, bytes[n]);
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48 exit(0);
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49 }