折腾了2天，选哪个成熟的库很重要，我选的http://blog.thiseldo.co.uk/ ，ethernetshield，或者ethercard也可以
cs 接 10，在代码有时需要指定
可以ping通，可以作为客户端浏览别的网站，也可以自己做成服务器（端口任意）供电脑浏览。
只是发布在内网比较方便，外网有点烦
// EtherShield webserver demo
#include "EtherShield.h"// please modify the following two lines. mac and ip have to be unique
// in your local area network. You can not have the same numbers in
// two devices:
static uint8_t mymac[6] = {0x54,0x55,0x58,0x10,0x00,0x25}; static uint8_t myip[4] = {192,168,8,110};#define MYWWWPORT 8080
#define BUFFER_SIZE 1000
static uint8_t buf[BUFFER_SIZE+1];// The ethernet shield
EtherShield es=EtherShield();uint16_t http200ok(void)
{return(es.ES_fill_tcp_data_p(buf,0,PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\nPragma: no-cache\r\n\r\n")));
}// prepare the webpage by writing the data to the tcp send buffer
uint16_t print_webpage(uint8_t *buf)
{uint16_t plen;plen=http200ok();plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<html><head><title>Arduino ENC28J60 Ethernet Shield V1.0</title></head><body>"));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<center><h1>Welcome to Arduino ENC28J60 Ethernet Shield V1.0</h1>"));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<hr><br><h2><font color=\"blue\">-- Put your ARDUINO online -- "));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<br> Control digital outputs"));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<br> Read digital analog inputs HERE"));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("<br></font></h2>") );plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("</center><hr>"));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("V1.0 <a href=\"http://blog.thiseldo.co.uk\">blog.thiseldo.co.uk</a>"));plen=es.ES_fill_tcp_data_p(buf,plen,PSTR("</body></html>"));return(plen);
}void setup(){// Initialise SPI interfacees.ES_enc28j60SpiInit();// initialize enc28j60es.ES_enc28j60Init(mymac);// init the ethernet/ip layer:es.ES_init_ip_arp_udp_tcp(mymac,myip, MYWWWPORT);
}void loop(){uint16_t plen, dat_p;while(1) {// read packet, handle ping and wait for a tcp packet:dat_p=es.ES_packetloop_icmp_tcp(buf,es.ES_enc28j60PacketReceive(BUFFER_SIZE, buf));/* dat_p will be unequal to zero if there is a valid * http get */if(dat_p==0){// no http requestcontinue;}// tcp port 80 beginif (strncmp("GET ",(char *)&(buf[dat_p]),4)!=0){// head, post and other methods:dat_p=http200ok();dat_p=es.ES_fill_tcp_data_p(buf,dat_p,PSTR("<h1>200 OK</h1>"));goto SENDTCP;}// just one web page in the "root directory" of the web serverif (strncmp("/ ",(char *)&(buf[dat_p+4]),2)==0){dat_p=print_webpage(buf);goto SENDTCP;}else{dat_p=es.ES_fill_tcp_data_p(buf,0,PSTR("HTTP/1.0 401 Unauthorized\r\nContent-Type: text/html\r\n\r\n<h1>401 Unauthorized</h1>"));goto SENDTCP;}
SENDTCP:es.ES_www_server_reply(buf,dat_p); // send web page data// tcp port 80 end}}