fskmodem_int.h

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */
 
/*! \file
 * \brief FSK Modem Support
 * \note Includes code and algorithms from the Zapata library.
 */
 
#ifndef _ASTERISK_FSKMODEM_H
#define _ASTERISK_FSKMODEM_H
 
#define PARITY_NONE     0
#define PARITY_EVEN     1
#define PARITY_ODD      2
 
 
#define NCOLA 0x4000
 
/* new filter structure */
struct filter_struct {
 
        int icoefs[8];
        int ip;
        int ixv[8];
        int iyv[8];
};
 
typedef struct {
    int nbit;   /*!< Number of Data Bits (5,7,8) */
    int parity; /*!< Parity 0=none 1=even 2=odd */
    int instop; /*!< Number of Stop Bits  */
    int hdlc;   /*!< Modo Packet */
    int xi0;
    int xi1;
    int xi2;
 
    int ispb;
    int icont;
    int bw;             /*!< Band Selector*/
    int f_mark_idx;         /*!< Mark Frequency Index (f_M-500)/5 */
    int f_space_idx;        /*!< Space Frequency Index (f_S-500)/5 */
    int state;
 
    int pllispb;        /*!<Pll autosense */
    int pllids;
    int pllispb2;
 
    struct filter_struct mark_filter;
    struct filter_struct space_filter;
    struct filter_struct demod_filter;
 
} fsk_data;
 
int fsk_serial(fsk_data *fskd, short *buffer, int *len, int *outbyte);
int fskmodem_init(fsk_data *fskd);
 
#endif /* _ASTERISK_FSKMODEM_H */