Asterisk - The Open Source Telephony Project  21.4.1
fskmodem_int.h
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1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2005, Digium, Inc.
5  *
6  * Mark Spencer <markster@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18 
19 /*! \file
20  * \brief FSK Modem Support
21  * \note Includes code and algorithms from the Zapata library.
22  */
23 
24 #ifndef _ASTERISK_FSKMODEM_H
25 #define _ASTERISK_FSKMODEM_H
26 
27 #define PARITY_NONE 0
28 #define PARITY_EVEN 1
29 #define PARITY_ODD 2
30 
31 
32 #define NCOLA 0x4000
33 
34 /* new filter structure */
35 struct filter_struct {
36 
37  int icoefs[8];
38  int ip;
39  int ixv[8];
40  int iyv[8];
41 };
42 
43 typedef struct {
44  int nbit; /*!< Number of Data Bits (5,7,8) */
45  int parity; /*!< Parity 0=none 1=even 2=odd */
46  int instop; /*!< Number of Stop Bits */
47  int hdlc; /*!< Modo Packet */
48  int xi0;
49  int xi1;
50  int xi2;
51 
52  int ispb;
53  int icont;
54  int bw; /*!< Band Selector*/
55  int f_mark_idx; /*!< Mark Frequency Index (f_M-500)/5 */
56  int f_space_idx; /*!< Space Frequency Index (f_S-500)/5 */
57  int state;
58 
59  int pllispb; /*!<Pll autosense */
60  int pllids;
61  int pllispb2;
62 
63  struct filter_struct mark_filter;
64  struct filter_struct space_filter;
65  struct filter_struct demod_filter;
66 
67 } fsk_data;
68 
69 int fsk_serial(fsk_data *fskd, short *buffer, int *len, int *outbyte);
70 int fskmodem_init(fsk_data *fskd);
71 
72 #endif /* _ASTERISK_FSKMODEM_H */
int fsk_serial(fsk_data *fskd, short *buffer, int *len, int *outbyte)
Retrieve a serial byte into outbyte. Buffer is a pointer into a series of shorts and len records the ...
int instop
Definition: fskmodem_int.h:46
int pllispb
Definition: fskmodem_int.h:59