一些ATMega16单片机驱动ENC28J60网卡的例程

#define DEBUG_PRINTF(...) /*printf(__VA_ARGS__)*/ /** * \defgroup uip The uIP TCP/IP stack * @{ * * uIP is an implementation of the TCP/IP protocol stack intended for * small 8-bit and 16-bit microcontrollers. * * uIP provides the necessary protocols for Internet communication, * with a very small code footprint and RAM requirements - the uIP * code size is on the order of a few kilobytes and RAM usage is on * the order of a few hundred bytes. */ /** * \file * The uIP TCP/IP stack code. * \author Adam Dunkels <adam@dunkels.com> */ /* * Copyright (c) 2001-2003, Adam Dunkels. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * This file is part of the uIP TCP/IP stack. * * $Id: uip.c,v 1.65 2006/06/11 21:46:39 adam Exp $ * */ /* * uIP is a small implementation of the IP, UDP and TCP protocols (as * well as some basic ICMP stuff). The implementation couples the IP, * UDP, TCP and the application layers very tightly. To keep the size * of the compiled code down, this code frequently uses the goto * statement. While it would be possible to break the uip_process() * function into many smaller functions, this would increase the code * size because of the overhead of parameter passing and the fact that * the optimier would not be as efficient. * * The principle is that we have a small buffer, called the uip_buf, * in which the device driver puts an incoming packet. The TCP/IP * stack parses the headers in the packet, and calls the * application. If the remote host has sent data to the application, * this data is present in the uip_buf and the application read the * data from there. It is up to the application to put this data into * a byte stream if needed. The application will not be fed with data * that is out of sequence. * * If the application whishes to send data to the peer, it should put * its data into the uip_buf. The uip_appdata pointer points to the * first available byte. The TCP/IP stack will calculate the * checksums, and fill in the necessary header fields and finally send * the packet back to the peer. */ #include "uip.h" #include "uipopt.h" #include "uip_arch.h" #if UIP_CONF_IPV6 #include "uip-neighbor.h" #endif /* UIP_CONF_IPV6 */ #include <string.h> #include <avr/pgmspace.h> /*---------------------------------------------------------------------------*/ /* Variable definitions. */ /* The IP address of this host. If it is defined to be fixed (by setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set here. Otherwise, the address */ #if UIP_FIXEDADDR > 0 const uip_ipaddr_t uip_hostaddr = {HTONS((UIP_IPADDR0 << 8) | UIP_IPADDR1), HTONS((UIP_IPADDR2 << 8) | UIP_IPADDR3)}; const uip_ipaddr_t uip_draddr = {HTONS((UIP_DRIPADDR0 << 8) | UIP_DRIPADDR1), HTONS((UIP_DRIPADDR2 << 8) | UIP_DRIPADDR3)}; const uip_ipaddr_t uip_netmask = {HTONS((UIP_NETMASK0 << 8) | UIP_NETMASK1), HTONS((UIP_NETMASK2 << 8) | UIP_NETMASK3)}; #else uip_ipaddr_t uip_hostaddr, uip_draddr, uip_netmask; #endif /* UIP_FIXEDADDR */ static const uip_ipaddr_t all_ones_addr = #if UIP_CONF_IPV6 {0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff}; #else /* UIP_CONF_IPV6 */ {0xffff,0xffff}; #endif /* UIP_CONF_IPV6 */ static const uip_ipaddr_t all_zeroes_addr = #if UIP_CONF_IPV6 {0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000}; #else /* UIP_CONF_IPV6 */ {0x0000,0x0000}; #endif /* UIP_CONF_IPV6 */ #if UIP_FIXEDETHADDR const struct uip_eth_addr uip_ethaddr = {{UIP_ETHADDR0, UIP_ETHADDR1, UIP_ETHADDR2, UIP_ETHADDR3, UIP_ETHADDR4, UIP_ETHADDR5}}; #else struct uip_eth_addr uip_ethaddr = {{0,0,0,0,0,0}}; #endif #ifndef UIP_CONF_EXTERNAL_BUFFER u8_t uip_buf[UIP_BUFSIZE + 2]; /* The packet buffer that contains incoming packets. */ #endif /* UIP_CONF_EXTERNAL_BUFFER */ void *uip_appdata; /* The uip_appdata pointer points to application data. */ void *uip_sappdata; /* The uip_appdata pointer points to the application data which is to be sent. */ #if UIP_URGDATA > 0 void *uip_urgdata; /* The uip_urgdata pointer points to urgent data (out-of-band data), if present. */ u16_t uip_urglen, uip_surglen; #endif /* UIP_URGDATA > 0 */ u16_t uip_len, uip_slen; /* The uip_len is either 8 or 16 bits, depending on the maximum packet size. */ u8_t uip_flags; /* The uip_flags variable is used for communication between the TCP/IP stack and the application program. */ struct uip_conn *uip_conn; /* uip_conn always points to the current connection. */ struct uip_conn uip_conns[UIP_CONNS]; /* The uip_conns array holds all TCP connections. */ u16_t uip_listenports[UIP_LISTENPORTS]; /* The uip_listenports list all currently listning ports. */ #if UIP_UDP struct uip_udp_conn *uip_udp_conn; struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS]; #endif /* UIP_UDP */ static u16_t ipid; /* Ths ipid variable is an increasing number that is used for the IP ID field. */ void uip_setipid(u16_t id) { ipid = id; } static u8_t iss[4]; /* The iss variable is used for the TCP initial sequence number. */ #if UIP_ACTIVE_OPEN static u16_t lastport; /* Keeps track of the last port used for a new connection. */ #endif /* UIP_ACTIVE_OPEN */ /* Temporary variables. */ u8_t uip_acc32[4]; static u8_t c, opt; static u16_t tmp16; /* Structures and definitions. */ #define TCP_FIN 0x01 #define TCP_SYN 0x02 #define TCP_RST 0x04 #define TCP_PSH 0x08 #define TCP_ACK 0x10 #define TCP_URG 0x20 #define TCP_CTL 0x3f #define TCP_OPT_END 0 /* End of TCP options list */ #define TCP_OPT_NOOP 1 /* "No-operation" TCP option */ #define TCP_OPT_MSS 2 /* Maximum segment size TCP option */ #define TCP_OPT_MSS_LEN 4 /* Length of TCP MSS option. */ #define ICMP_ECHO_REPLY 0 #define ICMP_ECHO 8 #define ICMP6_ECHO_REPLY 129 #define ICMP6_ECHO 128 #define ICMP6_NEIGHBOR_SOLICITATION 135 #define ICMP6_NEIGHBOR_ADVERTISEMENT 136 #define ICMP6_FLAG_S (1 << 6) #define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1 #define ICMP6_OPTION_TARGET_LINK_ADDRESS 2 /* Macros. */ #define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) #define FBUF ((struct uip_tcpip_hdr *)&uip_reassbuf[0]) #define ICMPBUF ((struct uip_icmpip_hdr *)&uip_buf[UIP_LLH_LEN]) #define UDPBUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN]) #if UIP_STATISTICS == 1 struct uip_stats uip_stat