【网络编程学习】+lihanchao+通过ESP8266接入网络并下载文件

发布于 2018-08-09 22:00:22 浏览：1643 订阅该版

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* 本帖最后由 lihanchao90 于 2018-8-9 22:09 编辑 *

#【网络编程学习】+lihanchao+通过ESP8266接入网络并下载文件

# 1.开发环境

##1.1软件环境

MDK5、env_0.7.0、RT-Thread_3.1.0

##1.2硬件环境
开发板：硬石YS-F4Pro开发板 
wifi模块 ：esp8266

#2.硬件连接
```sequence
main board->esp8266:uart6
main board->shell:uart1
main board->flash:spi2
```
![](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/94303658.jpg)
#3. 实验过程
##3.1 esp8266联网
### 3.1.1 board env配置
参考 [AT 组件应用笔记](https://www.rt-thread.org/document/site/rtthread-application-note/components/at/an0014-rtthread-system-at-client/)配置uart1为shell，uart6为esp8266，(图中the device name for console找了好久都没找到，直接在rtconfig.h中修改了，后来才发现藏在这里)
![uar1配置为shell](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/31991846.jpg)
uart1和uart6的驱动修改为对应板子的引脚
```c
void HAL_UART_MspInit(UART_HandleTypeDef *uartHandle)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    if (uartHandle->Instance == USART1)
    {
        /* USART1 clock enable */
        __HAL_RCC_USART1_CLK_ENABLE();
        __HAL_RCC_GPIOB_CLK_ENABLE();
        /**USART1 GPIO Configuration
        PA9/PB6     ------> USART1_TX
        PA10/PB7     ------> USART1_RX
        */
        GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
    }
    ......
}
```
### 3.1.2 AT Client env配置
- 开启AT Client功能

开始怎么也找不到这个AT commands，后来通过git pull命令更新了代码，才出现AT commands。
![AT Client](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/3782037.jpg)

###3.1.3 AT Client 下载验证

- at cli 功能
  这个功能真的很赞，at cli调试程序更加优雅，不用多接一根串口线了,
  ![at cli](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/72230542.jpg)
- 还有raw data功能，就不多说了，自己体会
- esp8266 ping 通过
  ![esp8266](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/52153094.jpg)

##3.2 文件系统
###3.2.1 webclient env配置
要访问web下载文件需要通过http协议的工具webclient下载，开启iot组件的 WebClient 软件包
![webclient env](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/9814575.jpg)
只有webclient只能下载文件不能存文件，还需要文件系统来保存文件，有个疑问：片内的rom可以做文件系统么？
###3.2.2 文件系统 env配置
- 在env中配置Device virtual file system
![Device virtual file system](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/9388028.jpg)
进入到 elm-chan's FatFs, Generic FAT Filesystem Module 子菜单，配置情况如图所示
![elm chans fatfs](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/47948776.jpg)
修改关于长文件名支持的选项，修改方式如下：
![long file name](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/64668319.jpg)

- DFS框架驱动
 开发板上flash为spi接口的norflash：w25q256 ，需要实现驱动与DFS框架爱对接，RTT中已实现SPI接口的驱动，我们只需要把spi的clk，mosi，miso ，cs配置好，注册到设备驱动就可以。env中可以选择spix通道和cs脚。本文中spi使用spi2，cs使用PC2引脚
 ![spi drv](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/56194361.jpg)
先按照上图配置好，才会出现下面的选项
![spi drv and cs](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/39119385.jpg)
引脚根据板上的分配来选择，cs使用的gpio所以要用gpio的驱动，gpio的引脚号可以在drv_gpio中查找。

```c
#if (STM32F4xx_PIN_NUMBERS == 176)
 __STM32_PIN_DEFAULT,
 __STM32_PIN(1, E, 2),
 __STM32_PIN(2, E, 3),
 ...
 __STM32_PIN(131, I, 0),//cs pin
 ...
#endif
```
spi接口配置
```c
/* SPI2 clock enable */
 __HAL_RCC_SPI2_CLK_ENABLE();
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOI_CLK_ENABLE();
 /**SPI2 GPIO Configuration
 PB13/PI1 ------> SPI2_SCK
 PB14/PC2 ------> SPI2_MISO
 PB15/PI3 ------> SPI2_MOSI
 /PI0 ------> SPI2_CS
 */
 GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_3;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
 HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_2;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); 
```
- 文件系统创建与挂载
 目前为止DFS框架和驱动都已经实现了，接下来需要创建文件系统和挂载文件系统，本文新建文件mkfs.c实现。
 
```c
#include <rtthread.h>
#include <board.h>
#include <dfs_fs.h>
#include <dfs_file.h>
#include "rtdef.h"
int mount_fs_to_flash(void)
{
 if(dfs_mount("flash0","/","elm",0,0)==0)
 {
 rt_kprintf("flash0 mount to /. ");
 }
 else
 {
 if(dfs_mkfs("elm","flash0")==0)
 {
 rt_kprintf("make elm flash0. ");
 if(dfs_mount("flash0","/","elm",0,0)==0)
 {
 rt_kprintf("flash0 mount to /. ");
 }
 else
 {
 rt_kprintf("flash0 mount to / failed. ");
 }
 }
 else
 {
 rt_kprintf("flash0 mount to / failed. ");
 }
 
 }
 return 0; 
}
INIT_ENV_EXPORT(mount_fs_to_flash);
```

### 3.2.3 DFS功能下载验证

```bash
msh />
 \ | /
- RT - Thread Operating System
 / | \ 3.1.0 build Aug 9 2018
 2006 - 2018 Copyright by rt-thread team
lwIP-2.0.2 initialized!
W25Q128BV detection
[I/AT] RT-Thread AT client (V0.2.4) initialize success.
[I/SAL_SOC] Socket Abstraction Layer initialize success.
make elm flash0.
flash0 mount to /.
[I/AT] ESP8266 WIFI is disconnect.
[D/AT] AT version:0.40.0.0(Aug 8 2015 14:45:58)
[D/AT] SDK version:1.3.0
[D/AT] Ai-Thinker Technology Co.,Ltd.
[D/AT] Build:1.3.0.2 Sep 11 2015 11:48:04
[I/AT] ESP8266 WIFI is connected.
[I/AT] AT network initialize success!
msh />list_de
list_device
msh />list_device
device type ref count
------ -------------------- ----------
flash0 Block Device 1 
norspi SPI Device 0 
spi2 SPI Bus 0 
uart6 Character Device 1 
uart2 Character Device 0 
uart1 Character Device 2 
pin Miscellaneous Device 0
```
flash0 Block Device 1 说明已经挂载好了
在根目录下创建个文件夹doc试试。
```bash
msh />pwd
/
msh />mkdir doc
msh />ls
Directory /:
doc <DIR> 
```
### 3.2.4 wget下载文件测试

试试wget下载文件,遇到open website failed，跟踪错误代码发现时webclient_connect-->connect(socket_handle, res->ai_addr, res->ai_addrlen) 在这里出现了，应该是socket的问题，看到armink提到lwip和at同时开启时会优先使用lwip，回头查看env，果然是这个问题。

```bash
msh />wget  http://183.193.243.90:9012/www/rt-thread.txt rtt.txt
open website failed.
```
关闭lwip后再次尝试,果然成功。
```bash
msh />wget http://183.193.243.90:9012/www/rt-thread.txt rtt.txt

Save 267 bytes
msh />la
la: command not found.
msh />ls
Directory /:
doc <DIR> 
rtt.txt 267 
msh />cat rtt
msh />cat rtt.txt
RT-Thread is an open source IoT operating system from China, which has strong scalability: from a tiny kernel running on a tiny core, for example ARM Cortex-M0, or Cortex-M3/4/7, to a rich feature system running on MIPS32, ARM Cortex-A8, ARM Cortex-A9 DualCore etc.
msh />

```
![wget](http://pd2mwb6nv.bkt.clouddn.com/18-8-9/19249690.jpg)

疑问1：片内的rom可以做文件系统么？