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ARM平台嵌入式Linux下使用3G/4G 模块

供稿:韬睿(上海)计算机科技有限公司 2016/4/12 16:14:20

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  • 关键词: ARM Linux 3G
  • 摘要:随着工业发展,嵌入式设备接入网络的需求日益增多,在没有有线或者无线以太网的环境下,直接通过3G/4G Modem连接运营商网络来接入互联网不失为一个好方法,本文就着重介绍基于ARM平台的嵌入式设备在Embedded Linux下使用3G/4G Modem的方法。

随着工业发展,嵌入式设备接入网络的需求日益增多,在没有有线或者无线以太网的环境下,直接通过3G/4G Modem连接运营商网络来接入互联网不失为一个好方法,本文就着重介绍基于ARM平台的嵌入式设备在Embedded Linux下使用3G/4G Modem的方法。

目前市面上的3G/4G modem和主机的连接方式主要有串口、USBmini-PCIE,串口模块比较传统且使用比较简单,而mini-PCIE在工业设备中目前应用还不广泛,因此本文使用USB 3G/4G modem来进行演示。

硬件准备

嵌入式平台基于ToradexColibri i.MX6工业产品级ARM核心板搭配Colibri开发载板,Embedded Linux采用Toradex官方发布兼容Yocto Project LinuxV2.5版本。

3G Modem使用华为E303s WCDMAModem,支持中国联通的3G网络

Linux Kernel准备

关于Linux kernel源代码下载及基本编译更新操作请参考这里,本文不再赘述,只简单列出操作如下:

a). 下载Linux kernel源代码

b). 下载安装Toolchain,并link “~/gcc-linaro “ 目录

$ wgethttp://releases.linaro.org/14.11/components/toolchain/binaries/arm-linux-gnueabihf/gcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf.tar.xz

$ tar xvfgcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf.tar.xz

$ ln -sgcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf gcc-linaro


c). 设置环境变量

$ export ARCH=arm

$ export PATH=~/gcc-linaro/bin/:$PATH

$ export CROSS_COMPILE=arm-linux-gnueabihf-

d). 配置

$ make colibri_imx6_defconfig

$ make menuconfig      //添加下面列出功能

--------------------

[*] Network device support  --->

     <*>   PPP (point-to-pointprotocol) support

     <*>     PPP BSD-Compresscompression

      <*>     PPP Deflatecompression

     [*]     PPP filtering

     <*>     PPP MPPE compression(encryption)

     [*]     PPP multilink support

     <*>     PPP over Ethernet

     <*>     PPP support for asyncserial ports

     <*>     PPP support for synctty ports

[*] USB support  --->

     <*>     USB Modem (CDC ACM)support

[*] USB support  --->

  <*>   USB Serial Convertersupport  --->

             <*>   USB driver for GSM and CDMA modems

--------------------

e). 重新编译kernel image

$ make -j3 uImage LOADADDR=100080002>&1 | tee build.log

f). 升级目标板

根据本章节开始提供的参考升级目标板到新的kernel image

相关软件准备

1).PPP

Toradex image默认已经安装,如果其他ARM平台image也是基于Yocto/OpenEmbedded环境编译,可以在local.conf文件中添加如下选项后编译

-----------------

IMAGE_INSTALL_append = " ppp"

-----------------

2). usb-modesiwtch-2.3.0

a). 需要libusb-1.0.x,先从这里下载源文件并解压

b). 使用上一章节配置的ToolChain如下设置交叉编译libusb

$ sudo CC="/home/xxx/gcc-linaro/bin/arm-linux-gnueabihf-gcc"CXX="/home/xxx/gcc-linaro/bin/arm-linux-gnueabihf-g++" ./configure--host=arm-linux-gnueabihf --prefix=/home/xxx/gcc-linaro --disable-udev

$ make

$ make install

c). 这里下载usb-modesiwtch并解压

d). 如下修改usb-modesiwtch 目录下Makefile

----------------

CC         = ~/gcc-linaro/bin/arm-linux-gnueabihf-gcc

CFLAGS     += -Wall -I/home/xxx/gcc-linaro/include -L/home/xxx/gcc-linaro/lib

----------------

e).交叉编译usb-modesiwtch

$ make

f). 从这里下载usb-modeswitch-data,和上面步骤编译出的usb-modesiwtch可执行文件一起上传到目标板

配置Modem连接网络

目前比较新的3G/4G都支持Ethernet模式和Fallback模式,而老一些的模块只支持Fallback模式,请根据所需模块情况自行参考下面操作。

1).Ethernet模式

a). E303s 3G Modem连接目标板,由于Modem上包含为了给Windows系统提供驱动而部署的存储分区,Linux默认将设备识别成USB Mass Storage设备

root@colibri-imx6:/home# lsusb

Bus 001 Device 004: ID 12d1:1f01 HuaweiTechnologies Co., Ltd. E353/E3131 (Mass storage mode)

……

b). 如下修改usb-modeswitch-data-20160112/usb_modeswitch.d目录下的12d1:1f01文件

-----------------------

#Huawei E303s Ethernet Mode

DefaultVendor=0x12d1

DefaultProduct=0x1f01

TargetVendor=0x12d1

TargetProduct=0x14db

MessageEndPoint= "0x01"

MessageContent="55534243123456780000000000000a11062000000000000100000000000000"

------------------------

c). 使用usb-modeswitch工具将modem设置为Ethernetmode

root@colibri-imx6:/home# ./usb_modeswitch-c 12d1:1f01

……

root@colibri-imx6:/home# [  840.027676] usb 1-1.1: USB disconnect, devicenumber 4

[ 840.284299] usb 1-1.1: new high-speed USB device number 6 using ci_hdrc

[ 840.427810] cdc_ether 1-1.1:1.0 eth1: register 'cdc_ether' atusb-ci_hdrc.0-1.1, CDC Ethernet Device, 58:2c:80:13:92:63

lsusb查看

root@colibri-imx6:/home# lsusb

Bus 001 Device 005: ID 12d1:14db HuaweiTechnologies Co., Ltd. E353/E3131

……

d). 查看网络,出现eth1,正确获取ip并连接到网络,下面就可以用使用以太网同样方法使用网络了

root@colibri-imx6:/home# ifconfig

……

eth1     Link encap:Ethernet  HWaddr58:2C:80:13:92:63  

        inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0

        inet6 addr: fe80::5a2c:80ff:fe13:9263/64 Scope:Link

        UP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1

        RX packets:37 errors:0 dropped:0 overruns:0 frame:0

        TX packets:69 errors:0 dropped:0 overruns:0 carrier:0

        collisions:0 txqueuelen:1000

        RX bytes:6899 (6.7 KiB)  TXbytes:10381 (10.1 KiB)

……

e). 验证网络连接

root@colibri-imx6:/home# ping www.baidu.com

PING www.baidu.com (61.135.169.121): 56data bytes

64 bytes from 61.135.169.121: seq=0 ttl=51time=88.261 ms

64 bytes from 61.135.169.121: seq=1 ttl=51time=77.998 ms

64 bytes from 61.135.169.121: seq=2 ttl=51time=68.410 ms

64 bytes from 61.135.169.121: seq=3 ttl=51time=68.242 ms

64 bytes from 61.135.169.121: seq=4 ttl=51time=68.166 ms

2). Fallback模式

有一些较老型号的2G/3G Modem只支持这个模式,无需再用usb-modeswitch转换,可以直接参考下面转换后的操作部分。

a). 如下修改usb-modeswitch-data-20160112/usb_modeswitch.d目录下的12d1:1f01文件

-----------------------

# Huawei E303s Fallback Mode

DefaultVendor=0x12d1

DefaultProduct=0x1f01

TargetVendor=0x12d1

TargetProduct=0x1001

MessageEndPoint = "0x01"

MessageContent="55534243123456780000000000000011063000000100010000000000000000"

NoDriverLoading=0

------------------------

b). 使用usb-modeswitch工具将modem设置为Fallbackmode

root@colibri-imx6:/home# ./usb_modeswitch-c 12d1\:1f01

……

root@colibri-imx6:/home# [ 2090.566190] usb1-1.1: new high-speed USB device number 8 using ci_hdrc

[ 2090.701092] option 1-1.1:1.0: GSM modem(1-port) converter detected

[ 2090.713488] usb 1-1.1: GSM modem(1-port) converter now attached to ttyUSB0

[ 2090.723517] option 1-1.1:1.1: GSM modem(1-port) converter detected

[ 2090.731817] usb 1-1.1: GSM modem(1-port) converter now attached to ttyUSB1

[ 2090.740318] option 1-1.1:1.2: GSM modem(1-port) converter detected

[ 2090.748184] usb 1-1.1: GSM modem(1-port) converter now attached to ttyUSB


lsusb 查看

root@colibri-imx6:/home# lsusb

Bus 001 Device 008: ID 12d1:1001 HuaweiTechnologies Co., Ltd. E169/E620/E800 HSDPA Modem

……

c). 测试连接

root@colibri-imx6:/home# ls -l /dev/ttyUSB*

crw-rw----    1 root    dialout   188,   0 Apr 11 09:49 /dev/ttyUSB0

crw-rw----    1 root    dialout   188,   1 Apr 11 09:49 /dev/ttyUSB1

crw-rw----    1 root    dialout   188,   2 Apr 11 09:49 /dev/ttyUSB2

root@colibri-imx6:/home# minicom -D/dev/ttyUSB0

------------------

Welcome to minicom 2.7

OPTIONS: I18n

Compiled on Nov  3 2015, 04:06:26.

Port /dev/ttyUSB0, 09:53:44

Press CTRL-A Z for help on special keys

AT

OK

--------------------

d). 编写ppp连接配置文件wcdma, wcdma-chat-connectwcdma-chat-disconnect

root@colibri-imx6:/etc/ppp/peers# vi wcdma

-----------------

nodetach

lock

/dev/ttyUSB0

115200

user "card"

password "card"

crtscts

#hide-password

show-password

usepeerdns

noauth

noipdefault

novj

novjccomp

noccp

defaultroute

ipcp-accept-local

ipcp-accept-remote

connect '/usr/sbin/chat -s -v -f/etc/ppp/peers/wcdma-chat-connect'

disconnect '/usr/sbin/chat -s -v -f/etc/ppp/peers/wcdma-chat-disconnect'

----------------------

root@colibri-imx6:/etc/ppp/peers# viwcdma-chat-connect

--------------------

ABORT "BUSY"

ABORT "NO CARRIER"

ABORT "NO DIALTONE"

ABORT "ERROR"

ABORT "NO ANSWER"

TIMEOUT 120

"" AT

OK \rATZ

OK\rAT+CGDCONT=1,"IP","3gnet",,0,0

OK-AT-OK ATDT*99#

CONNECT \d\c

--------------------------

root@colibri-imx6:/etc/ppp/peers# viwcdma-chat-disconnect

-----------------------

ABORT "ERROR"

ABORT "NO DIALTONE"

SAY "\NSending break to themodem\n"

""\k"

""+++ATH"

SAY "\nGood bay\n"

---------------------------

e). 连接网络

root@colibri-imx6:/etc/ppp/peers# pppd callwcdma

……

ATDT*99#^M^M

CONNECT

--got it

send (\d)

Serial connection established.

Using interface ppp0

Connect: ppp0 <--> /dev/ttyUSB0

CHAP authentication succeeded: Welcome!!

CHAP authentication succeeded

Could not determine remote IP address:defaulting to 10.64.64.64

local IP address 10.91.228.253

remote IP address 10.64.64.64

primary  DNS address 221.12.1.227

secondary DNS address 221.12.33.227

查看网络状态

root@colibri-imx6:/etc/ppp/peers# ifconfig

……

ppp0     Link encap:Point-to-Point Protocol

        inet addr:10.23.107.61 P-t-P:10.64.64.64 Mask:255.255.255.255

        UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500  Metric:1

        RX packets:6 errors:0 dropped:0 overruns:0 frame:0

        TX packets:6 errors:0 dropped:0overruns:0 carrier:0

        collisions:0 txqueuelen:3

        RX bytes:84 (84.0 B)  TX bytes:102(102.0 B)

f). 测试网络

root@colibri-imx6:/etc/ppp/peers# echonameserver 221.12.1.227 > /etc/resolv.conf                 //设置DNS服务器

root@colibri-imx6:/etc/ppp/peers# pingwww.baidu.com

PING www.baidu.com (61.135.169.121): 56data bytes

64 bytes from 61.135.169.121: seq=0 ttl=52time=218.477 ms

64 bytes from 61.135.169.121: seq=1 ttl=52time=68.066 ms

64 bytes from 61.135.169.121: seq=2 ttl=52time=107.773 ms

64 bytes from 61.135.169.121: seq=3 ttl=52time=77.604 ms

64 bytes from 61.135.169.121: seq=4 ttl=52time=77.339 ms

总结

根据上述两种模式的测试结果,第一种Ethernet mode相对速度要更稳定一些,因此对于支持两种模式的modem更建议采用Ethernet mode;另外串口modem使用配置也可以参考Fallback mode。本文虽以E303s为例,但其他3G/4G Modem的配置也是类似,只是需要确定对应模式的Vendor IDProduct IDMessage

参考文档

https://www.toradex.cn/zh_cn/computer-on-modules/colibri-arm-family/nxp-freescale-imx6

https://www.toradex.cn/zh_cn/products/carrier-board/colibri-evaluation-carrier-board

http://developer.toradex.com/software/linux/linux-software

http://www.draisberghof.de/usb_modeswitch/

http://www.cnblogs.com/ziqiuqiandao/archive/2013/06/06/3120972.html

更多内容请访问 韬睿(上海)计算机科技有限公司(http://c.gongkong.com/?cid=16879)

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