/* If pbuf is to be allocated in RAM, allocate memory for it. */ p = (struct pbuf *)mem...
修改lwip_memory_options设置,将mem_size,memp_n_pbuf,mem_n_tcp_pcb,memp_n_tcp_seg这4个参数值设大,这样会提高TCP传输效率。如下图所示。 修改pbuf_options设置,将pbuf_pool_size设大,增加可用的pbuf数量,这样同样会提高TCP传输效率。如下图所示。 修改tcp_options设置,将tcp_snd_buf,tcp_wnd参数设大,这...
#define PBUF_POOL_BUFSIZE 1500 /* --- 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 0 /* TCP Maximum segment size. */ #...
The PCB is removed from the list of * UDP PCB's and the data structure is freed from memory. * * @see udp_new() */ void udp_remove(struct udp_pcb *pcb) { struct udp_pcb *pcb2; LWIP_ASSERT_CORE_LOCKED(); /* 内核所内 */ LWIP_ERROR("udp_remove: invalid pcb", pcb != ...
LWIP(Light Weight Internet Protoco1)是瑞士计算机科学院(Swedish Institute of Computer Science)AdamDunkels等人开发的一套用于嵌入式系统的开放源代码TCP/IP协议栈。LWIP的含义是Light Weight(轻型)IP协议。LWIP可以移植到操作系统上,也可以在无操作系统的情况下独立运行。LWIP TCP/IP实现的重点是在保持TCP协议主要功...
Hi,I'm trying to track down a memory leak that is happening on a EDK10.1 (SP3) platform with the ethernetlite and lwip 1.3.0. The leak itself is happening on the PBUF_POOL and I have observed this by monitoring the MEMP P
pbuf典型结构 右边展示的pbuf_layer就是用来首部地址偏移,用来对应相应的结构体。 3.lwIP网络数据包类型 四种网络数据包类型 PBUF_RAM采用内存堆,长度不定,一般都是用在传输数据;PBUF_POOL采用内存池,固定大小的内存块,所以分配速度快(一般1500字节,就是分配3个PBUF_POOL的内存池),一般用在中断服务中;PBUF_ROM和...
3.3.2. PBUF_POOL 3.3.3. PBUF_REF/PBUF_ROM 4. 数据收发过程(以UDP为例) 4.1. udp初始化 4.2. udp发送 4.3. udp接收 5. TCP协议实现 5.1. 数据收发过程梳理(以建立连接为例) 5.2. 序列号与确认机制 5.2.1. 序列号初始化 5.2.2. 确认机制 ...
#define UDP_DEMO_PORT 8087 struct netif lwip_netif; //定义一个全局的网络接口 int main(void)...
/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */ #define PBUF_POOL_BUFSIZE 1280 /** SYS_LIGHTWEIGHT_PROT * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection * for certain critical regions during buffer allocation, deallocation and memory * ...