修改一下"lwip/opt.h"文件里的宏定义试试
/**
* MEMP_NUM_RAW_PCB: Number of raw connection PCBs
* (requires the LWIP_RAW option)
*/
#ifndef MEMP_NUM_RAW_PCB
#define MEMP_NUM_RAW_PCB x
#endif
/**
* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
* per active UDP "connection".
* (requires the LWIP_UDP option)
*/
#ifndef MEMP_NUM_UDP_PCB
#define MEMP_NUM_UDP_PCB x
#endif
/**
* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB
#define MEMP_NUM_TCP_PCB x
#endif
/**
* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN x
#endif
opt.h
/**
* MEMP_NUM_RAW_PCB: Number of raw connection PCBs
* (requires the LWIP_RAW option)
*/
#ifndef MEMP_NUM_RAW_PCB
#define MEMP_NUM_RAW_PCB 10
#endif
/**
* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
* per active UDP "connection".
* (requires the LWIP_UDP option)
*/
#ifndef MEMP_NUM_UDP_PCB
#define MEMP_NUM_UDP_PCB 7
#endif
/**
* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB
#define MEMP_NUM_TCP_PCB 7
#endif
/**
* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN 10
#endif
/**
* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_SEG
#define MEMP_NUM_TCP_SEG 16
#endif
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn/data/attach/logo/logo.png', '推荐 xueyoujin 的问题《stm32 ucos 创建socket端口数》','https://www.xiaopingtou.net/q-123958.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
#define NUM_SOCKETS MEMP_NUM_NETCONN
define MEMP_NUM_NETCONN //原来是4改成5就行了
/**
* MEMP_NUM_RAW_PCB: Number of raw connection PCBs
* (requires the LWIP_RAW option)
*/
#ifndef MEMP_NUM_RAW_PCB
#define MEMP_NUM_RAW_PCB x
#endif
/**
* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
* per active UDP "connection".
* (requires the LWIP_UDP option)
*/
#ifndef MEMP_NUM_UDP_PCB
#define MEMP_NUM_UDP_PCB x
#endif
/**
* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB
#define MEMP_NUM_TCP_PCB x
#endif
/**
* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN x
#endif
#define SYS_LIGHTWEIGHT_PROT 1
#define NO_SYS 0
#define MEM_ALIGNMENT 4
#define MEM_SIZE 16000
#define MEMP_NUM_PBUF 20
#define MEMP_NUM_UDP_PCB 10
#define MEMP_NUM_TCP_PCB_LISTEN 15
#define MEMP_NUM_TCP_SEG 20
#define MEMP_NUM_SYS_TIMEOUT 15
opt.h
/**
* MEMP_NUM_RAW_PCB: Number of raw connection PCBs
* (requires the LWIP_RAW option)
*/
#ifndef MEMP_NUM_RAW_PCB
#define MEMP_NUM_RAW_PCB 10
#endif
/**
* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
* per active UDP "connection".
* (requires the LWIP_UDP option)
*/
#ifndef MEMP_NUM_UDP_PCB
#define MEMP_NUM_UDP_PCB 7
#endif
/**
* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB
#define MEMP_NUM_TCP_PCB 7
#endif
/**
* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN 10
#endif
/**
* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
* (requires the LWIP_TCP option)
*/
#ifndef MEMP_NUM_TCP_SEG
#define MEMP_NUM_TCP_SEG 16
#endif
改完还是不行
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