openwrt 3g模塊上網

硬件環境：

    開發板爲RT5053F   

    3G模塊爲中興 MC2176 電信版

如下是操做步驟

• 加入VID 、PID

  VID 、 PID 的獲取方法是  將設備插入電腦在linux下執行lsusb命令，如圖

  
  
  或者是依照無線模塊驅動使用手冊，將產品支持的IDS全部增長option.c文件裏

  openwrt-1407在例如如下位置:
  build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7620n/linux-3.10.49/drivers/usb/serial/option.c
  

  
  
• 內核的編譯配置

  make kernel_ menuconfig

  USB串口驅動相關的配置項：

  Device Drivers  ---> [*] USB support  --->   
  	<*>   Support for Host-side USB
  	[*]     USB announce new devices
  	[*]     Enable USB persist by default
  	<*>     EHCI HCD (USB 2.0) support
  	[*]       Root Hub Transaction Translators
  	[*]       Improved Transaction Translator scheduling
  	<*>     OHCI HCD (USB 1.1) support
  	<*>     USB Modem (CDC ACM) support
  	<*>     USB Printer support
  	<*>     USB Wireless Device Management support
  	<*>   USB Serial Converter support  ---> 
  		<*>   USB driver for GSM and CDMA modems
  

  PPP撥號的相關配置：

  Device Drivers  ---> [*] Network device support  --->
  	<*>   PPP (point-to-point protocol) support
  	<*>     PPP BSD-Compress compression
  	<*>     PPP Deflate compression
  	[*]     PPP filtering
  	<*>     PPP MPPE compression (encryption)
  	[*]     PPP multilink support
  	<*>     PPP over Ethernet
  	<*>     PPP support for async serial ports
  	<*>     PPP support for sync tty ports
  

  所需軟件包：

  ppp
  chat
  comgt
  librt
  libusb-1.0
  usb-modeswith
  zlib
  

  保存 運行make V=99 後將編譯好的鏡像文件燒寫到開發板。而後啓動開發板

  
  

配置 網絡

/etc/config/network
config interface 'ppp0'
        option ifname 'ppp0'
        option service 'evdo'
        option username 'card'
        option password 'card'
        option device '/dev/ttyUSB0'
        option proto '3g'
        option dialnumber '#777'
        option apn 'ctnet'
        option auto 1

從新啓動網絡

/etc/init.d/netwrok restart

從新啓動後 執行ifcong命令，若出現ppp接口表示撥號成功，如圖