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comparison 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
parents
children 6d832abad660
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5:e80b0051cd92 6:ba66d297fe57
1 /*
2 * In this module we implement modem Rx handling, revolving around
3 * FSK demodulation via SpanDSP.
4 */
5
6 #include <sys/types.h>
7 #include <stdio.h>
8 #include <stdint.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <strings.h>
12 #include <spandsp.h>
13 #include "../include/pstn_defs.h"
14
15 extern int fsk_mode_rx;
16
17 static fsk_rx_state_t *fsk_rx_state;
18
19 static void
20 byte_rx_func(user_data, byte)
21 void *user_data;
22 int byte;
23 {
24 if (byte < 0) {
25 printf("Modem state change: %s\n", signal_status_to_str(byte));
26 return;
27 }
28 printf("Rx byte: 0x%02X\n", byte);
29 }
30
31 void
32 init_modem_rx()
33 {
34 fsk_rx_state = fsk_rx_init(NULL, &preset_fsk_specs[fsk_mode_rx],
35 FSK_FRAME_MODE_FRAMED, byte_rx_func, NULL);
36 if (!fsk_rx_state) {
37 fprintf(stderr, "error: fsk_rx_init() failed!\n");
38 exit(1);
39 }
40 }
41
42 void
43 process_rx_frame(samples)
44 int16_t *samples;
45 {
46 fsk_rx(fsk_rx_state, samples, FRAME_20MS);
47 }