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