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annotate test-fsk/modem_rx.c @ 6:ba66d297fe57

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test-fsk: first attempt at modem Rx
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 04 Mar 2024 23:21:07 -0800
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children 6d832abad660
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ba66d297fe57 test-fsk: first attempt at modem Rx
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1 /*
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2 * In this module we implement modem Rx handling, revolving around
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3 * FSK demodulation via SpanDSP.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include <spandsp.h>
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13 #include "../include/pstn_defs.h"
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14
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15 extern int fsk_mode_rx;
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16
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17 static fsk_rx_state_t *fsk_rx_state;
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18
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19 static void
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20 byte_rx_func(user_data, byte)
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21 void *user_data;
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22 int byte;
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23 {
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24 if (byte < 0) {
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25 printf("Modem state change: %s\n", signal_status_to_str(byte));
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26 return;
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27 }
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28 printf("Rx byte: 0x%02X\n", byte);
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29 }
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30
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31 void
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32 init_modem_rx()
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33 {
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34 fsk_rx_state = fsk_rx_init(NULL, &preset_fsk_specs[fsk_mode_rx],
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35 FSK_FRAME_MODE_FRAMED, byte_rx_func, NULL);
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36 if (!fsk_rx_state) {
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37 fprintf(stderr, "error: fsk_rx_init() failed!\n");
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38 exit(1);
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39 }
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40 }
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41
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42 void
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43 process_rx_frame(samples)
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44 int16_t *samples;
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45 {
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46 fsk_rx(fsk_rx_state, samples, FRAME_20MS);
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47 }