{"id":77426,"date":"2026-02-24T16:33:58","date_gmt":"2026-02-24T08:33:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/77426.html"},"modified":"2026-02-24T16:33:58","modified_gmt":"2026-02-24T08:33:58","slug":"w5500-tcp%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%8a%b6%e6%80%81%e6%9c%ba%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%bb%8esock_closed%e5%88%b0sock_established%e7%9a%84%e5%ae%8c%e6%95%b4%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/77426.html","title":{"rendered":"W5500 TCP\u670d\u52a1\u5668\u72b6\u6001\u673a\u8be6\u89e3\uff1a\u4eceSOCK_CLOSED\u5230SOCK_ESTABLISHED\u7684\u5b8c\u6574\u6d41\u7a0b"},"content":{"rendered":"<h2>W5500 TCP\u670d\u52a1\u5668\u72b6\u6001\u673a\u6df1\u5ea6\u89e3\u6790&#xff1a;\u4ece\u521d\u59cb\u5316\u5230\u7a33\u5b9a\u8fde\u63a5\u7684\u5168\u94fe\u8def\u5b9e\u8df5<\/h2>\n<p>\u5728\u5d4c\u5165\u5f0f\u7f51\u7edc\u901a\u4fe1\u9886\u57df&#xff0c;W5500\u82af\u7247\u56e0\u5176\u786c\u4ef6\u534f\u8bae\u6808\u7684\u7a33\u5b9a\u6027\u548c\u4f4e\u8d44\u6e90\u5360\u7528\u7387&#xff0c;\u6210\u4e3a\u4f17\u591a\u7269\u8054\u7f51\u8bbe\u5907\u7684\u9996\u9009\u7f51\u7edc\u63a5\u53e3\u65b9\u6848\u3002\u4e0d\u540c\u4e8e\u8f6f\u4ef6\u534f\u8bae\u6808\u9700\u8981\u6d88\u8017\u5927\u91cfMCU\u8d44\u6e90&#xff0c;W5500\u901a\u8fc7\u5185\u7f6e\u7684\u786c\u4ef6\u72b6\u6001\u673a\u81ea\u52a8\u5904\u7406TCP\/IP\u534f\u8bae\u6808\u7684\u590d\u6742\u4ea4\u4e92&#xff0c;\u5f00\u53d1\u8005\u53ea\u9700\u5173\u6ce8\u51e0\u4e2a\u5173\u952e\u72b6\u6001\u5bc4\u5b58\u5668\u5373\u53ef\u5b9e\u73b0\u53ef\u9760\u7684\u7f51\u7edc\u901a\u4fe1\u3002\u672c\u6587\u5c06\u6df1\u5165\u5256\u6790W5500\u4f5c\u4e3aTCP\u670d\u52a1\u5668\u65f6\u7684\u72b6\u6001\u8f6c\u6362\u673a\u5236&#xff0c;\u7ed3\u5408\u5b9e\u6218\u4ee3\u7801\u6f14\u793a\u5982\u4f55\u6784\u5efa\u4e00\u4e2a\u9ad8\u53ef\u9760\u6027\u7684\u5d4c\u5165\u5f0f\u7f51\u7edc\u670d\u52a1\u7aef\u3002<\/p>\n<h3>1. W5500\u786c\u4ef6\u534f\u8bae\u6808\u67b6\u6784\u89e3\u6790<\/h3>\n<p>W5500\u82af\u7247\u5185\u90e8\u96c6\u6210\u4e86\u5b8c\u6574\u7684TCP\/IP\u534f\u8bae\u6808\u786c\u4ef6\u52a0\u901f\u5f15\u64ce&#xff0c;\u5176\u6838\u5fc3\u662f\u4e00\u4e2a8\u901a\u9053\u72ec\u7acbSocket\u63a7\u5236\u5668\u3002\u6bcf\u4e2aSocket\u90fd\u62e5\u6709\u4e13\u5c5e\u768416KB\u6536\u53d1\u7f13\u5b58\u548c\u5b8c\u6574\u7684\u72b6\u6001\u673a\u903b\u8f91&#xff0c;\u8fd9\u79cd\u786c\u4ef6\u9694\u79bb\u8bbe\u8ba1\u4f7f\u5f97\u591a\u8fde\u63a5\u7ba1\u7406\u53d8\u5f97\u7b80\u5355\u9ad8\u6548\u3002<\/p>\n<p>\u5173\u952e\u786c\u4ef6\u7279\u6027\u5bf9\u6bd4&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027\u8f6f\u4ef6\u534f\u8bae\u6808\u5b9e\u73b0W5500\u786c\u4ef6\u65b9\u6848<\/tr>\n<tbody>\n<tr>\n<td>CPU\u8d44\u6e90\u5360\u7528<\/td>\n<td>30-50%<\/td>\n<td>&lt;5%<\/td>\n<\/tr>\n<tr>\n<td>\u8fde\u63a5\u54cd\u5e94\u901f\u5ea6<\/td>\n<td>10-100ms<\/td>\n<td>1-10ms<\/td>\n<\/tr>\n<tr>\n<td>\u5e76\u53d1\u8fde\u63a5\u6570<\/td>\n<td>\u53d7\u9650\u4e8eRAM<\/td>\n<td>8\u4e2a\u72ec\u7acbSocket<\/td>\n<\/tr>\n<tr>\n<td>\u534f\u8bae\u5904\u7406\u7a33\u5b9a\u6027<\/td>\n<td>\u4f9d\u8d56\u8f6f\u4ef6\u5b9e\u73b0\u8d28\u91cf<\/td>\n<td>\u786c\u4ef6\u7ea7CRC\u6821\u9a8c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u82af\u7247\u5185\u90e8\u7684\u72b6\u6001\u673a\u7531\u4ee5\u4e0b\u51e0\u4e2a\u6838\u5fc3\u5bc4\u5b58\u5668\u63a7\u5236&#xff1a;<\/p>\n<ul>\n<li>Sn_SR&#xff08;Socket n\u72b6\u6001\u5bc4\u5b58\u5668&#xff09;&#xff1a;\u53cd\u6620\u5f53\u524dSocket\u7684\u8fde\u63a5\u72b6\u6001&#xff0c;\u59820x17\u8868\u793a\u8fde\u63a5\u5df2\u5efa\u7acb<\/li>\n<li>Sn_IR&#xff08;Socket n\u4e2d\u65ad\u5bc4\u5b58\u5668&#xff09;&#xff1a;\u8bb0\u5f55\u8fde\u63a5\u5efa\u7acb\u3001\u6570\u636e\u63a5\u6536\u7b49\u4e8b\u4ef6\u6807\u5fd7<\/li>\n<li>Sn_PORT&#xff08;Socket n\u7aef\u53e3\u53f7\u5bc4\u5b58\u5668&#xff09;&#xff1a;\u914d\u7f6e\u670d\u52a1\u76d1\u542c\u7aef\u53e3<\/li>\n<\/ul>\n<p>\/\/ W5500\u5bc4\u5b58\u5668\u8bfb\u53d6\u793a\u4f8b<br \/>\nuint8_t getSn_SR(uint8_t sn) {<br \/>\n    return WIZCHIP_READ(Sn_SR(sn));<br \/>\n}<\/p>\n<p>\u63d0\u793a&#xff1a;\u786c\u4ef6\u534f\u8bae\u6808\u867d\u7136\u964d\u4f4e\u4e86\u5f00\u53d1\u96be\u5ea6&#xff0c;\u4f46\u72b6\u6001\u673a\u7684\u6b63\u786e\u54cd\u5e94\u4ecd\u662f\u7a33\u5b9a\u901a\u4fe1\u7684\u5173\u952e\u3002\u5efa\u8bae\u5728\u5173\u952e\u72b6\u6001\u8f6c\u6362\u5904\u6dfb\u52a0\u8c03\u8bd5\u65e5\u5fd7\u3002<\/p>\n<h3>2. TCP\u670d\u52a1\u5668\u72b6\u6001\u673a\u5168\u6d41\u7a0b\u62c6\u89e3<\/h3>\n<h4>2.1 \u521d\u59cb\u5316\u9636\u6bb5&#xff08;SOCK_CLOSED \u2192 SOCK_INIT&#xff09;<\/h4>\n<p>\u5728\u51b7\u542f\u52a8\u6216\u8fde\u63a5\u91cd\u7f6e\u540e&#xff0c;Socket\u81ea\u52a8\u8fdb\u5165SOCK_CLOSED\u72b6\u6001&#xff08;0x00&#xff09;\u3002\u6b64\u65f6\u9700\u8981\u6267\u884c\u4ee5\u4e0b\u521d\u59cb\u5316\u5e8f\u5217&#xff1a;<\/p>\n<li>\u914d\u7f6eSocket\u5de5\u4f5c\u6a21\u5f0f\u4e3aTCP\u670d\u52a1\u5668&#xff1a;#define Sn_MR_TCP 0x01  \/\/ TCP\u6a21\u5f0f<br \/>\n#define Sn_MR_ND  0x20  \/\/ \u65e0\u5ef6\u8fdf\u6a21\u5f0f<br \/>\nsocket(sock_num, Sn_MR_TCP, local_port, Sn_MR_ND);<\/p>\n<\/li>\n<li>\u68c0\u67e5Sn_SR\u72b6\u6001\u662f\u5426\u53d8\u4e3aSOCK_INIT&#xff08;0x13&#xff09;<\/li>\n<li>\u914d\u7f6e\u63a5\u6536\u7f13\u51b2\u533a\u5927\u5c0f&#xff08;\u5efa\u8bae\u81f3\u5c112KB&#xff09;<\/li>\n<p>\u5178\u578b\u95ee\u9898\u6392\u67e5&#xff1a;<\/p>\n<ul>\n<li>\u82e5\u72b6\u6001\u672a\u53d8\u5316&#xff0c;\u68c0\u67e5SPI\u901a\u4fe1\u662f\u5426\u6b63\u5e38<\/li>\n<li>\u786e\u8ba4\u7aef\u53e3\u53f7\u672a\u88ab\u7cfb\u7edf\u4fdd\u7559&#xff08;\u5982&lt;1024\u9700\u8981\u6743\u9650&#xff09;<\/li>\n<\/ul>\n<h4>2.2 \u76d1\u542c\u9636\u6bb5&#xff08;SOCK_INIT \u2192 SOCK_LISTEN&#xff09;<\/h4>\n<p>\u8fdb\u5165SOCK_INIT\u72b6\u6001\u540e&#xff0c;\u9700\u542f\u52a8\u7aef\u53e3\u76d1\u542c&#xff1a;<\/p>\n<p>listen(sock_num);  \/\/ \u542f\u52a8\u76d1\u542c<br \/>\nwhile(getSn_SR(sock_num) !&#061; SOCK_LISTEN) {<br \/>\n    \/\/ \u6dfb\u52a0\u8d85\u65f6\u68c0\u6d4b\u903b\u8f91<br \/>\n    if(timeout()) {<br \/>\n        close(sock_num);<br \/>\n        return ERR_TIMEOUT;<br \/>\n    }<br \/>\n}<\/p>\n<p>\u72b6\u6001\u8f6c\u6362\u65f6\u5e8f\u56fe&#xff1a;<\/p>\n<li>\u6210\u529f\u76d1\u542c \u2192 SOCK_LISTEN&#xff08;0x14&#xff09;<\/li>\n<li>\u5ba2\u6237\u7aef\u53d1\u8d77\u8fde\u63a5 \u2192 SOCK_ESTABLISHED&#xff08;0x17&#xff09;<\/li>\n<li>\u8fde\u63a5\u5f02\u5e38 \u2192 SOCK_CLOSE_WAIT&#xff08;0x1C&#xff09;<\/li>\n<h4>2.3 \u6570\u636e\u4f20\u8f93\u9636\u6bb5&#xff08;SOCK_ESTABLISHED&#xff09;<\/h4>\n<p>\u8fde\u63a5\u5efa\u7acb\u540e\u7684\u6838\u5fc3\u5904\u7406\u903b\u8f91&#xff1a;<\/p>\n<p>case SOCK_ESTABLISHED:<br \/>\n    \/\/ \u6e05\u9664\u8fde\u63a5\u4e2d\u65ad\u6807\u5fd7<br \/>\n    if(getSn_IR(sock_num) &amp; Sn_IR_CON) {<br \/>\n        setSn_IR(sock_num, Sn_IR_CON);<br \/>\n        log(&#034;Connection established&#034;);<br \/>\n    }<\/p>\n<p>    \/\/ \u6570\u636e\u63a5\u6536\u5904\u7406<br \/>\n    uint16_t data_len &#061; getSn_RX_RSR(sock_num);<br \/>\n    if(data_len &gt; 0) {<br \/>\n        uint8_t buf[2048];<br \/>\n        recv(sock_num, buf, data_len);<br \/>\n        process_data(buf, data_len);  \/\/ \u5e94\u7528\u5c42\u6570\u636e\u5904\u7406<br \/>\n    }<br \/>\n    break;<\/p>\n<p>\u6027\u80fd\u4f18\u5316\u6280\u5de7&#xff1a;<\/p>\n<ul>\n<li>\u4f7f\u7528Sn_RX_RSR\u9884\u5224\u6570\u636e\u91cf\u907f\u514d\u9891\u7e41\u67e5\u8be2<\/li>\n<li>\u8bbe\u7f6e\u5408\u7406\u7684TCP\u7a97\u53e3\u5927\u5c0f&#xff08;\u901a\u8fc7Sn_RXBUF_SIZE\u5bc4\u5b58\u5668&#xff09;<\/li>\n<\/ul>\n<h3>3. \u5f02\u5e38\u5904\u7406\u4e0e\u72b6\u6001\u6062\u590d<\/h3>\n<h4>3.1 \u8fde\u63a5\u4e2d\u65ad\u5904\u7406&#xff08;SOCK_CLOSE_WAIT&#xff09;<\/h4>\n<p>\u5f53\u68c0\u6d4b\u5230SOCK_CLOSE_WAIT\u72b6\u6001\u65f6&#xff0c;\u5e94\u6267\u884c\u4f18\u96c5\u5173\u95ed&#xff1a;<\/p>\n<li>\u53d1\u9001\u5269\u4f59\u5f85\u53d1\u6570\u636e&#xff08;\u5982\u679c\u6709&#xff09;<\/li>\n<li>\u8c03\u7528close()\u91ca\u653eSocket\u8d44\u6e90<\/li>\n<li>\u5ef6\u65f6100ms\u540e\u91cd\u65b0\u521d\u59cb\u5316Socket<\/li>\n<p>case SOCK_CLOSE_WAIT:<br \/>\n    send(sock_num, pending_data, pending_len);  \/\/ \u53d1\u9001\u6b8b\u7559\u6570\u636e<br \/>\n    close(sock_num);<br \/>\n    delay_ms(100);<br \/>\n    socket(sock_num, Sn_MR_TCP, port, Sn_MR_ND);<br \/>\n    break;<\/p>\n<h4>3.2 \u5e38\u89c1\u9519\u8bef\u4ee3\u7801\u5904\u7406<\/h4>\n<table>\n<tr>\u9519\u8bef\u73b0\u8c61\u53ef\u80fd\u539f\u56e0\u89e3\u51b3\u65b9\u6848<\/tr>\n<tbody>\n<tr>\n<td>\u65e0\u6cd5\u8fdb\u5165SOCK_INIT<\/td>\n<td>SPI\u901a\u4fe1\u5f02\u5e38<\/td>\n<td>\u68c0\u67e5CS\/SCK\u5f15\u811a\u8fde\u63a5<\/td>\n<\/tr>\n<tr>\n<td>\u9891\u7e41\u65ad\u5f00\u8fde\u63a5<\/td>\n<td>\u7f51\u7edc\u62e5\u585e\u6216ARP\u8d85\u65f6<\/td>\n<td>\u8c03\u6574Keepalive\u53c2\u6570<\/td>\n<\/tr>\n<tr>\n<td>\u6570\u636e\u5305\u4e0d\u5b8c\u6574<\/td>\n<td>\u7f13\u51b2\u533a\u6ea2\u51fa<\/td>\n<td>\u589e\u5927Sn_RXBUF_SIZE<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>4. \u5b9e\u6218&#xff1a;\u6784\u5efa\u5de5\u4e1a\u7ea7TCP\u670d\u52a1\u5668<\/h3>\n<h4>4.1 \u591a\u8fde\u63a5\u8d1f\u8f7d\u5747\u8861\u5b9e\u73b0<\/h4>\n<p>\u5229\u7528W5500\u76848\u4e2a\u72ec\u7acbSocket\u5b9e\u73b0\u8fde\u63a5\u6c60\u7ba1\u7406&#xff1a;<\/p>\n<p>#define MAX_SOCKETS 8<\/p>\n<p>struct socket_manager {<br \/>\n    uint8_t in_use;<br \/>\n    uint32_t last_active;<br \/>\n    uint16_t client_ip;<br \/>\n};<\/p>\n<p>struct socket_manager pool[MAX_SOCKETS];<\/p>\n<p>uint8_t alloc_socket() {<br \/>\n    for(uint8_t i&#061;0; i&lt;MAX_SOCKETS; i&#043;&#043;) {<br \/>\n        if(!pool[i].in_use &amp;&amp; getSn_SR(i)&#061;&#061;SOCK_CLOSED) {<br \/>\n            pool[i].in_use &#061; 1;<br \/>\n            return i;<br \/>\n        }<br \/>\n    }<br \/>\n    return 0xFF;  \/\/ \u65e0\u53ef\u7528Socket<br \/>\n}<\/p>\n<h4>4.2 \u5fc3\u8df3\u68c0\u6d4b\u673a\u5236<\/h4>\n<p>\u901a\u8fc7Keepalive\u5bc4\u5b58\u5668\u914d\u7f6e\u81ea\u52a8\u4fdd\u6d3b&#xff1a;<\/p>\n<p>void setup_keepalive(uint8_t sn, uint8_t time, uint8_t intvl) {<br \/>\n    WIZCHIP_WRITE(Sn_KPALVTR(sn), time);    \/\/ \u7a7a\u95f2\u65f6\u95f4\u9608\u503c<br \/>\n    WIZCHIP_WRITE(Sn_KPALVTR(sn)&#043;1, intvl); \/\/ \u63a2\u6d4b\u95f4\u9694<br 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