slip.h

在ARM7和UC/OSII的平台上实现了GPS自动报站的功能,涉及GPS模块LEA_4S的驱动,位置速寻算法,语音芯片ISD4004的录放音驱动,LED页面管理等等.从启动代码到操作系统的移植以及到业

/*
 * FILENAME: slip.h
 *
 * Copyright  2000 By InterNiche Technologies Inc. All rights reserved
 *
 * Slip support
 *
 * MODULE: INET
 *
 *
 * PORTABLE: yes
 */

/* Additional Copyrights: */

/* Portions Copyright 1994, 1995 by NetPort Software */

#ifndef _SLIP_H_
#define  _SLIP_H_

#include "comline.h"

/* standard defines. These are decimal versions of the 
values given in octal in the slip RFC. */
#define  SL_ESC         219
#define  SL_END         192
#define  SL_ESC_END     220
#define  SL_ESC_ESC     221

/* MAX size of SLIP packet. See RFC before modifying */
#define  SLIPSIZ     1536
extern   u_char   slipbuf[SLIPSIZ];

struct slip_errors
{
   unsigned    serr_noends;         /* didn't find SL_END where expected */
   unsigned    serr_overflow;       /* frame overflowed buffer */
   unsigned    serr_connect;        /* loer level connect failed */
   unsigned    serr_nobuff;         /* buffer alloc failed */
   unsigned    serr_noframe;        /* got char outside of SLIP frame */
   unsigned    serr_iphdr;          /* SLIP data was not IP packet */
};

/* slip internal utilites */
char *   slipstrip(u_char * bytes, unsigned * length);
char *   slipstuff(u_char * buf, unsigned * pkt_len, unsigned buf_len);

/* slip byte & frame receive entry points */
int   slip_rxframe(int line, u_char * buffer, unsigned length);
int   slip_rxbyte(int line, int byte);

#define  SLIP_TEST_HEADER     1  /* this tests for an RFC recommended enhancement */

#endif   /* _SLIP_H_ */