LWIP官方DEMO使用之httpd服务
前言
LWIP的移植可以参考上篇文章 《HC32F4A0 lwip移植 - USTHzhanglu - 博客园 (cnblogs.com）》
此博文为学习笔记，仅介绍如何使用官方demo，无更深入分析。
关键词：LWIP, HTTP, HTTPD, HC32
参数
| MCU型号 | HC32F4A0PIHB |
|---|---|
| 库版本 | HC32F4A0_DDL_Rev2.0.0 |
| LWIP版本 | lwip-STABLE-2_2_0_RC1 |
| PHY型号 | YT8512 |
| MDK版本 | 5.37 |
| PHY接口 | RMII |
| IP | IPv4 |
导入库
在Lwip 2.2.x版本，apps文件夹中，已经预置了httpd服务。结构如下：
$ tree apps/http/ -aAC
apps/http/
├── altcp_proxyconnect.c
├── fs
│ ├── 404.html
│ ├── img
│ │ └── sics.gif
│ └── index.html
├── fs.c
├── fsdata.c
├── fsdata.h
├── http_client.c
├── httpd.c
├── httpd_structs.h
└── makefsdata
├── makefsdata
├── makefsdata.c
├── readme.txt
└── tinydir.h
其中需要包含到工程中的文件有fs.c 和 httpd.c，其他相关依赖会自动包含。
使用
httpd依赖于tcp，在lwip_lwipopts.h中使能tcp
/* ---------- TCP options ---------- */
#define LWIP_TCP 1
#define TCP_TTL 255
#define LWIP_TCP_KEEPALIVE 1
在初始化lwip完成后初始化httpd
lwip_init();
netif_init();
httpd_init();
为了便于测试，在lwip_lwipopts.h中开启debug功能
#define LWIP_DEBUG
//#define ETHARP_DEBUG LWIP_DBG_ON
//#define PBUF_DEBUG LWIP_DBG_ON
//#define NETIF_DEBUG LWIP_DBG_ON
#define HTTPD_DEBUG LWIP_DBG_ON
然后编译烧录即可
运行测试
开启了mdns后，可以直接以域名的方式进行访问，在浏览器中输入lwip.local，访问成功会出现如下页面：
log如下:
httpd_init
mdns status[netif 0][service 0]: 1
http_accept 1ffead78 / 00000000
http_recv: pcb=1ffead78 pbuf=1ffedd84 err=Ok.
Received 487 bytes
First pbuf
CRLF received, parsing request
Received GET request"
Received "GET" request for URI: "/"
Looking for /index.shtml...
Looking for /index.ssi...
Looking for /index.shtm...
Looking for /index.html...
Opened.
http_recv: data 000504b3 len 1881
http_send: pcb=1ffead78 hs=1ffe698c left=1881
Trying to send 1881 bytes
Sent 1881 bytes
End of file.
Closing connection 1ffead78
http_accept 1ffeacd8 / 00000000
http_recv: pcb=1ffeacd8 pbuf=1ffedd84 err=Ok.
Received 401 bytes
First pbuf
CRLF received, parsing request
Received GET request"
Received "GET" request for URI: "/img/sics.gif"
Opening /img/sics.gif
http_recv: data 0004fe84 len 853
http_send: pcb=1ffeacd8 hs=1ffe69e0 left=853
Trying to send 853 bytes
Sent 853 bytes
End of file.
Closing connection 1ffeacd8
http_accept 1ffeac38 / 00000000
http_poll: pcb=1ffeac38 hs=1ffe69e0 pcb_state=ESTABLISHED
