st5481_hdlc.h
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上传日期：2013-02-24
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- /*
- * Driver for ST5481 USB ISDN modem
- *
- * Author Frode Isaksen
- * Copyright 2001 by Frode Isaksen <fisaksen@bewan.com>
- * 2001 by Kai Germaschewski <kai.germaschewski@gmx.de>
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- *
- */
- #ifndef __ST5481_HDLC_H__
- #define __ST5481_HDLC_H__
- struct hdlc_vars {
- int bit_shift;
- int hdlc_bits1;
- int data_bits;
- int ffbit_shift; // encoding only
- int state;
- int dstpos;
- int data_received:1; // set if transferring data
- int dchannel:1; // set if D channel (send idle instead of flags)
- int do_adapt56:1; // set if 56K adaptation
- int do_closing:1; // set if in closing phase (need to send CRC + flag
- unsigned short crc;
- unsigned char cbin;
- unsigned char shift_reg;
- unsigned char ffvalue;
-
- };
- /*
- The return value from hdlc_decode is
- the frame length, 0 if no complete frame was decoded,
- or a negative error number
- */
- #define HDLC_FRAMING_ERROR 1
- #define HDLC_CRC_ERROR 2
- #define HDLC_LENGTH_ERROR 3
- void
- hdlc_rcv_init(struct hdlc_vars *hdlc, int do_adapt56);
- int
- hdlc_decode(struct hdlc_vars *hdlc, const unsigned char *src, int slen,int *count,
- unsigned char *dst, int dsize);
- void
- hdlc_out_init(struct hdlc_vars *hdlc,int is_d_channel,int do_adapt56);
- int
- hdlc_encode(struct hdlc_vars *hdlc,const unsigned char *src,unsigned short slen,int *count,
- unsigned char *dst,int dsize);
- #endif
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