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发表于 2010-5-29 17:16:04
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请高人指点：：：：：
既然LWIP定位是简单的应用，那么在并不复杂的的应用中应该没有问题吧，
毕竟都发布了很多个版本了。。。
可能还是移植问题，毕竟大多数哥们都对LWIP不是完全了解，
我遇到的问题是：无论怎样断线》链接后，都能PING通。
但是，采用lwip的API（自己的测试程序）与外界通讯时，多次发送接收后就出错，return ERR_MEM;
err_t tcp_enqueue(struct tcp_pcb *pcb, void *arg, u16_t len,
u8_t flags, u8_t copy,
u8_t *optdata, u8_t optlen)）
{
.
.
.
/* fail on too much data */
if (len > pcb->snd_buf) {
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_enqueue: too much data (len=%"U16_F" > snd_buf=%"U16_F")\n", len, pcb->snd_buf));
return ERR_MEM;
}
.
.
.
}
但我跟踪了len并不大（我的测试程序中每次都是29）
关键是pcb->snd_buf 出问题，正常循环每次都减少29，所以多接收和发送后就进入上面的条件，报错。
我初始化时
/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF 1500
即使把TCP_SND_BUF加大也还是一样的问题。。。
我的“LWIPOPTS_H”如下：
#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__
/* ------------------------ Generic options ------------------------------- */
#undef LWIP_NOASSERT
#define SYS_LIGHTWEIGHT_PROT 1
#define TCPIP_THREAD_PRIO 10
//#define LWIP_DEBUG 1
#define DBG_TYPES_ON ( DBG_LEVEL_WARNING | DBG_LEVEL_SEVERE | DBG_LEVEL_SERIOUS )
#define FEC_DEBUG ( DBG_LEVEL_WARNING | DBG_ON )
/* ------------------------ Memory options -------------------------------- */
/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
byte alignment -> define MEM_ALIGNMENT to 2. */
#define MEM_ALIGNMENT 4
/* MEM_SIZE: the size of the heap memory. If the application will send
a lot of data that needs to be copied, this should be set high. */
#define MEM_SIZE 2048
/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
sends a lot of data out of ROM (or other static memory), this
should be set high. */
#define MEMP_NUM_PBUF 16
/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
per active UDP "connection". */
#define MEMP_NUM_UDP_PCB 4
/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
connections. */
#define MEMP_NUM_TCP_PCB 8
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 8
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
segments. */
#define MEMP_NUM_TCP_SEG 16
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
timeouts. */
#define MEMP_NUM_SYS_TIMEOUT 4
/* The following four are used only with the sequential API and can be
set to 0 if the application only will use the raw API. */
/* MEMP_NUM_NETBUF: the number of struct netbufs. */
#define MEMP_NUM_NETBUF 4
/* MEMP_NUM_NETCONN: the number of struct netconns. */
#define MEMP_NUM_NETCONN 4
/* MEMP_NUM_APIMSG: the number of struct api_msg, used for
communication between the TCP/IP stack and the sequential
programs. */
#define MEMP_NUM_API_MSG 8
/* MEMP_NUM_TCPIPMSG: the number of struct tcpip_msg, which is used
for sequential API communication and incoming packets. Used in
src/api/tcpip.c. */
#define MEMP_NUM_TCPIP_MSG 8
/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
#define PBUF_POOL_SIZE 16
/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
#define PBUF_POOL_BUFSIZE 512
/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
link level header. */
#define PBUF_LINK_HLEN 14
/* ------------------------ TCP options ----------------------------------- */
#define LWIP_TCP 1
#define TCP_TTL 255
/* Controls if TCP should queue segments that arrive out of
order. Define to 0 if your device is low on memory. */
#define TCP_QUEUE_OOSEQ 1
/* TCP Maximum segment size. */
#define TCP_MSS 1500
/* TCP sender buffer space (bytes). */
#define TCP_SND_BUF 1500
/* TCP sender buffer space (pbufs). This must be at least = 2 *
TCP_SND_BUF/TCP_MSS for things to work. */
#define TCP_SND_QUEUELEN ( 16 * TCP_SND_BUF/TCP_MSS )
/* TCP receive window. */
#define TCP_WND 1500
/* Maximum number of retransmissions of data segments. */
#define TCP_MAXRTX 12
/* Maximum number of retransmissions of SYN segments. */
#define TCP_SYNMAXRTX 4
/* ------------------------ ARP options ----------------------------------- */
#define ARP_TABLE_SIZE 10
#define ARP_QUEUEING 1
/* ------------------------ IP options ------------------------------------ */
/* Define IP_FORWARD to 1 if you wish to have the ability to forward
IP packets across network interfaces. If you are going to run lwIP
on a device with only one network interface, define this to 0. */
#define IP_FORWARD 0
/* If defined to 1, IP options are allowed (but not parsed). If
defined to 0, all packets with IP options are dropped. */
#define IP_OPTIONS 1
/* ------------------------ ICMP options ---------------------------------- */
#define ICMP_TTL 255
/* ------------------------ DHCP options ---------------------------------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
turning this on does currently not work. */
#define LWIP_DHCP 0
/* 1 if you want to do an ARP check on the offered address
(recommended). */
#define DHCP_DOES_ARP_CHECK 1
/* ------------------------ UDP options ----------------------------------- */
#define LWIP_UDP 1
#define UDP_TTL 255
/* ------------------------ Statistics options ---------------------------- */
#define STATS
#ifdef STATS
#define LINK_STATS 1
#define IP_STATS 1
#define ICMP_STATS 1
#define UDP_STATS 1
#define TCP_STATS 1
#define MEM_STATS 1
#define MEMP_STATS 1
#define PBUF_STATS 1
#define SYS_STATS 1
#endif /* STATS */
#define LWIP_PROVIDE_ERRNO 1
#endif /* __LWIPOPTS_H__ */ |
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楼主
MEMP_NUM_SYS_TIMEOUT设置多大好呢？
