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annotate trau-decode/parse-data.c @ 77:729dbac9df82

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trau-decode: factor out parse-data.c
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Feb 2025 05:16:35 +0000
parents trau-decode/parse-main.c@d4ee42801cdc
children
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1 /*
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2 * This module contains a bit of code that has been factored out of
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3 * trau-parse program; it handles data frames.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11
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12 static unsigned
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13 bits_to_num(bits, nbits)
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14 uint8_t *bits;
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15 unsigned nbits;
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16 {
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17 unsigned accum;
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18 unsigned n;
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19
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20 accum = 0;
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21 for (n = 0; n < nbits; n++) {
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22 accum <<= 1;
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23 if (*bits)
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24 accum |= 1;
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25 bits++;
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26 }
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27 return accum;
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28 }
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29
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30 static void
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31 print_data_subframe(nf, bits)
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32 uint8_t *bits;
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33 {
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34 unsigned nb;
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36 printf(" Data frame %d:", nf);
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37 for (nb = 0; nb < 9; nb++) {
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38 printf(" %02X", bits_to_num(bits, 8));
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39 bits += 8;
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40 }
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41 putchar('\n');
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42 }
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43
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44 void
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45 print_data_frame(frame_bits)
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46 uint8_t *frame_bits;
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47 {
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48 printf(" C6-C15: %u%u%u%u%u%u%u%u%u%u\n", frame_bits[22],
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49 frame_bits[23], frame_bits[24], frame_bits[25],
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50 frame_bits[26], frame_bits[27], frame_bits[28],
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51 frame_bits[29], frame_bits[30], frame_bits[31]);
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52 print_data_subframe(0, frame_bits + 4 * 8);
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53 print_data_subframe(1, frame_bits + 13 * 8);
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54 print_data_subframe(2, frame_bits + 22 * 8);
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55 print_data_subframe(3, frame_bits + 31 * 8);
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56 }
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57
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58 void
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59 print_edata_frame(frame_bits)
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60 uint8_t *frame_bits;
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61 {
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62 printf(" C6-C13: %u%u%u%u%u%u%u%u\n", frame_bits[22],
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63 frame_bits[23], frame_bits[24], frame_bits[25],
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64 frame_bits[26], frame_bits[27], frame_bits[28],
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65 frame_bits[29]);
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66 printf(" M1=%u M2=%u\n", frame_bits[30], frame_bits[31]);
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67 }