Yann Garcia / Mbed 2 deprecated DS130x_I2CApp

This short program illustrates how to use the DS130x_I2C library. My objective is to share the same RTC with Microchip 18F MCU.

Dependencies:   mbed DebugLibrary

NetServices/lwip/netif/ppp/vj.h@1:995212d326ca, 2011-02-11 (annotated)

Committer:
Yann
Date:
Fri Feb 11 10:17:20 2011 +0000
Revision:
1:995212d326ca
Parent:
0:f30e2135b0db 
V0.0.0.2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Yann 0:f30e2135b0db 1 /*
Yann 0:f30e2135b0db 2 * Definitions for tcp compression routines.
Yann 0:f30e2135b0db 3 *
Yann 0:f30e2135b0db 4 * $Id: vj.h,v 1.7 2010/02/22 17:52:09 goldsimon Exp $
Yann 0:f30e2135b0db 5 *
Yann 0:f30e2135b0db 6 * Copyright (c) 1989 Regents of the University of California.
Yann 0:f30e2135b0db 7 * All rights reserved.
Yann 0:f30e2135b0db 8 *
Yann 0:f30e2135b0db 9 * Redistribution and use in source and binary forms are permitted
Yann 0:f30e2135b0db 10 * provided that the above copyright notice and this paragraph are
Yann 0:f30e2135b0db 11 * duplicated in all such forms and that any documentation,
Yann 0:f30e2135b0db 12 * advertising materials, and other materials related to such
Yann 0:f30e2135b0db 13 * distribution and use acknowledge that the software was developed
Yann 0:f30e2135b0db 14 * by the University of California, Berkeley. The name of the
Yann 0:f30e2135b0db 15 * University may not be used to endorse or promote products derived
Yann 0:f30e2135b0db 16 * from this software without specific prior written permission.
Yann 0:f30e2135b0db 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
Yann 0:f30e2135b0db 18 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
Yann 0:f30e2135b0db 19 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Yann 0:f30e2135b0db 20 *
Yann 0:f30e2135b0db 21 * Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
Yann 0:f30e2135b0db 22 * - Initial distribution.
Yann 0:f30e2135b0db 23 */
Yann 0:f30e2135b0db 24
Yann 0:f30e2135b0db 25 #ifndef VJ_H
Yann 0:f30e2135b0db 26 #define VJ_H
Yann 0:f30e2135b0db 27
Yann 0:f30e2135b0db 28 #include "lwip/ip.h"
Yann 0:f30e2135b0db 29 #include "lwip/tcp_impl.h"
Yann 0:f30e2135b0db 30
Yann 0:f30e2135b0db 31 #define MAX_SLOTS 16 /* must be > 2 and < 256 */
Yann 0:f30e2135b0db 32 #define MAX_HDR 128
Yann 0:f30e2135b0db 33
Yann 0:f30e2135b0db 34 /*
Yann 0:f30e2135b0db 35 * Compressed packet format:
Yann 0:f30e2135b0db 36 *
Yann 0:f30e2135b0db 37 * The first octet contains the packet type (top 3 bits), TCP
Yann 0:f30e2135b0db 38 * 'push' bit, and flags that indicate which of the 4 TCP sequence
Yann 0:f30e2135b0db 39 * numbers have changed (bottom 5 bits). The next octet is a
Yann 0:f30e2135b0db 40 * conversation number that associates a saved IP/TCP header with
Yann 0:f30e2135b0db 41 * the compressed packet. The next two octets are the TCP checksum
Yann 0:f30e2135b0db 42 * from the original datagram. The next 0 to 15 octets are
Yann 0:f30e2135b0db 43 * sequence number changes, one change per bit set in the header
Yann 0:f30e2135b0db 44 * (there may be no changes and there are two special cases where
Yann 0:f30e2135b0db 45 * the receiver implicitly knows what changed -- see below).
Yann 0:f30e2135b0db 46 *
Yann 0:f30e2135b0db 47 * There are 5 numbers which can change (they are always inserted
Yann 0:f30e2135b0db 48 * in the following order): TCP urgent pointer, window,
Yann 0:f30e2135b0db 49 * acknowlegement, sequence number and IP ID. (The urgent pointer
Yann 0:f30e2135b0db 50 * is different from the others in that its value is sent, not the
Yann 0:f30e2135b0db 51 * change in value.) Since typical use of SLIP links is biased
Yann 0:f30e2135b0db 52 * toward small packets (see comments on MTU/MSS below), changes
Yann 0:f30e2135b0db 53 * use a variable length coding with one octet for numbers in the
Yann 0:f30e2135b0db 54 * range 1 - 255 and 3 octets (0, MSB, LSB) for numbers in the
Yann 0:f30e2135b0db 55 * range 256 - 65535 or 0. (If the change in sequence number or
Yann 0:f30e2135b0db 56 * ack is more than 65535, an uncompressed packet is sent.)
Yann 0:f30e2135b0db 57 */
Yann 0:f30e2135b0db 58
Yann 0:f30e2135b0db 59 /*
Yann 0:f30e2135b0db 60 * Packet types (must not conflict with IP protocol version)
Yann 0:f30e2135b0db 61 *
Yann 0:f30e2135b0db 62 * The top nibble of the first octet is the packet type. There are
Yann 0:f30e2135b0db 63 * three possible types: IP (not proto TCP or tcp with one of the
Yann 0:f30e2135b0db 64 * control flags set); uncompressed TCP (a normal IP/TCP packet but
Yann 0:f30e2135b0db 65 * with the 8-bit protocol field replaced by an 8-bit connection id --
Yann 0:f30e2135b0db 66 * this type of packet syncs the sender & receiver); and compressed
Yann 0:f30e2135b0db 67 * TCP (described above).
Yann 0:f30e2135b0db 68 *
Yann 0:f30e2135b0db 69 * LSB of 4-bit field is TCP "PUSH" bit (a worthless anachronism) and
Yann 0:f30e2135b0db 70 * is logically part of the 4-bit "changes" field that follows. Top
Yann 0:f30e2135b0db 71 * three bits are actual packet type. For backward compatibility
Yann 0:f30e2135b0db 72 * and in the interest of conserving bits, numbers are chosen so the
Yann 0:f30e2135b0db 73 * IP protocol version number (4) which normally appears in this nibble
Yann 0:f30e2135b0db 74 * means "IP packet".
Yann 0:f30e2135b0db 75 */
Yann 0:f30e2135b0db 76
Yann 0:f30e2135b0db 77 /* packet types */
Yann 0:f30e2135b0db 78 #define TYPE_IP 0x40
Yann 0:f30e2135b0db 79 #define TYPE_UNCOMPRESSED_TCP 0x70
Yann 0:f30e2135b0db 80 #define TYPE_COMPRESSED_TCP 0x80
Yann 0:f30e2135b0db 81 #define TYPE_ERROR 0x00
Yann 0:f30e2135b0db 82
Yann 0:f30e2135b0db 83 /* Bits in first octet of compressed packet */
Yann 0:f30e2135b0db 84 #define NEW_C 0x40 /* flag bits for what changed in a packet */
Yann 0:f30e2135b0db 85 #define NEW_I 0x20
Yann 0:f30e2135b0db 86 #define NEW_S 0x08
Yann 0:f30e2135b0db 87 #define NEW_A 0x04
Yann 0:f30e2135b0db 88 #define NEW_W 0x02
Yann 0:f30e2135b0db 89 #define NEW_U 0x01
Yann 0:f30e2135b0db 90
Yann 0:f30e2135b0db 91 /* reserved, special-case values of above */
Yann 0:f30e2135b0db 92 #define SPECIAL_I (NEW_S|NEW_W|NEW_U) /* echoed interactive traffic */
Yann 0:f30e2135b0db 93 #define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U) /* unidirectional data */
Yann 0:f30e2135b0db 94 #define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U)
Yann 0:f30e2135b0db 95
Yann 0:f30e2135b0db 96 #define TCP_PUSH_BIT 0x10
Yann 0:f30e2135b0db 97
Yann 0:f30e2135b0db 98
Yann 0:f30e2135b0db 99 /*
Yann 0:f30e2135b0db 100 * "state" data for each active tcp conversation on the wire. This is
Yann 0:f30e2135b0db 101 * basically a copy of the entire IP/TCP header from the last packet
Yann 0:f30e2135b0db 102 * we saw from the conversation together with a small identifier
Yann 0:f30e2135b0db 103 * the transmit & receive ends of the line use to locate saved header.
Yann 0:f30e2135b0db 104 */
Yann 0:f30e2135b0db 105 struct cstate {
Yann 0:f30e2135b0db 106 struct cstate *cs_next; /* next most recently used state (xmit only) */
Yann 0:f30e2135b0db 107 u_short cs_hlen; /* size of hdr (receive only) */
Yann 0:f30e2135b0db 108 u_char cs_id; /* connection # associated with this state */
Yann 0:f30e2135b0db 109 u_char cs_filler;
Yann 0:f30e2135b0db 110 union {
Yann 0:f30e2135b0db 111 char csu_hdr[MAX_HDR];
Yann 0:f30e2135b0db 112 struct ip_hdr csu_ip; /* ip/tcp hdr from most recent packet */
Yann 0:f30e2135b0db 113 } vjcs_u;
Yann 0:f30e2135b0db 114 };
Yann 0:f30e2135b0db 115 #define cs_ip vjcs_u.csu_ip
Yann 0:f30e2135b0db 116 #define cs_hdr vjcs_u.csu_hdr
Yann 0:f30e2135b0db 117
Yann 0:f30e2135b0db 118
Yann 0:f30e2135b0db 119 struct vjstat {
Yann 0:f30e2135b0db 120 unsigned long vjs_packets; /* outbound packets */
Yann 0:f30e2135b0db 121 unsigned long vjs_compressed; /* outbound compressed packets */
Yann 0:f30e2135b0db 122 unsigned long vjs_searches; /* searches for connection state */
Yann 0:f30e2135b0db 123 unsigned long vjs_misses; /* times couldn't find conn. state */
Yann 0:f30e2135b0db 124 unsigned long vjs_uncompressedin; /* inbound uncompressed packets */
Yann 0:f30e2135b0db 125 unsigned long vjs_compressedin; /* inbound compressed packets */
Yann 0:f30e2135b0db 126 unsigned long vjs_errorin; /* inbound unknown type packets */
Yann 0:f30e2135b0db 127 unsigned long vjs_tossed; /* inbound packets tossed because of error */
Yann 0:f30e2135b0db 128 };
Yann 0:f30e2135b0db 129
Yann 0:f30e2135b0db 130 /*
Yann 0:f30e2135b0db 131 * all the state data for one serial line (we need one of these per line).
Yann 0:f30e2135b0db 132 */
Yann 0:f30e2135b0db 133 struct vjcompress {
Yann 0:f30e2135b0db 134 struct cstate *last_cs; /* most recently used tstate */
Yann 0:f30e2135b0db 135 u_char last_recv; /* last rcvd conn. id */
Yann 0:f30e2135b0db 136 u_char last_xmit; /* last sent conn. id */
Yann 0:f30e2135b0db 137 u_short flags;
Yann 0:f30e2135b0db 138 u_char maxSlotIndex;
Yann 0:f30e2135b0db 139 u_char compressSlot; /* Flag indicating OK to compress slot ID. */
Yann 0:f30e2135b0db 140 #if LINK_STATS
Yann 0:f30e2135b0db 141 struct vjstat stats;
Yann 0:f30e2135b0db 142 #endif
Yann 0:f30e2135b0db 143 struct cstate tstate[MAX_SLOTS]; /* xmit connection states */
Yann 0:f30e2135b0db 144 struct cstate rstate[MAX_SLOTS]; /* receive connection states */
Yann 0:f30e2135b0db 145 };
Yann 0:f30e2135b0db 146
Yann 0:f30e2135b0db 147 /* flag values */
Yann 0:f30e2135b0db 148 #define VJF_TOSS 1U /* tossing rcvd frames because of input err */
Yann 0:f30e2135b0db 149
Yann 0:f30e2135b0db 150 extern void vj_compress_init (struct vjcompress *comp);
Yann 0:f30e2135b0db 151 extern u_int vj_compress_tcp (struct vjcompress *comp, struct pbuf *pb);
Yann 0:f30e2135b0db 152 extern void vj_uncompress_err (struct vjcompress *comp);
Yann 0:f30e2135b0db 153 extern int vj_uncompress_uncomp(struct pbuf *nb, struct vjcompress *comp);
Yann 0:f30e2135b0db 154 extern int vj_uncompress_tcp (struct pbuf **nb, struct vjcompress *comp);
Yann 0:f30e2135b0db 155
Yann 0:f30e2135b0db 156 #endif /* VJ_H */