linux下GPRS模块ppp拨号上网

时间:2022-01-10 22:27:16

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交叉编译器:arm-linux-gcc-4.5.4

Linux内核版本:Linux-3.0

主机操作系统:Centos 6.5

开发板:FL2440

GPRS:SIM900A

在开发SIM900模块之前,开发板已经加载了linux内核以及文件系统,并且开发板串口已经使能。并且一定要注意的是:要有一张没有欠费的电话卡!不要笑,这是个很严肃的问题!

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所需源码:

ppp-2.4.4.tar.gz  http://download.chinaunix.net/download.php?id=35208&ResourceID=8334

 

注:个人觉得这是一个比较典型又比较简单的移植问题。

大体步骤:添加内核ppp上网的支持-->编译ppp-2.4.4生成一些可执行文件(pppd, chat, pppdump, pppstats)放到开发板的/usr/sbin/目录下-->将可执行脚本放在开发板的指定位置(/etc/ppp/peers/gprs, /etc/ppp/chat-gprs-connect),并执行pppd命令。

 

一、添加内核支持

Linux-3.0以上的版本中,rt3070的驱动已经加入了内核源码中去了,本篇用的是Linux-3.0的内核,只需要在内核的make menuconfig中选择ppp上网的支持就可以了。

修改如下:

Device Drivers --->
  [*] Network device support --->
    <*> PPP (point-to-point protocol) support
    [*] PPP multilink support (EXPERIMENTAL)
    <*> PPP support for async serial ports
    <*> PPP support for sync tty ports
    <*> SLIP (serial line) support
    [*] CSLIP compressed headers

 

二、编译ppp-2.4.4

# tar -xzf  ppp-2.4.4.tar.gz

# ./configure

# make CC=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc (交叉编译器)

如果编译成功,则会在pppd, chat, pppdump, pppstats下分别生成可执行程序pppd, chat, pppdump, pppstats。将其拷贝到开发板的/usr/sbin目录下。

 

三、开发板的配置

# vi /etc/ppp/peers/gprs

 1 # Usage: root>pppd call gprs
 2 
 3 #set seriral
 4 /dev/ttyS1
 5 
 6 # set baudrate
 7 115200
 8 
 9 # set flowdate
10 nocrtscts
11 
12 connect '/usr/sbin/chat -v -f /etc/ppp/gprs-connect-chat'
13 
14 #set debug ,send message to /var/log/messages
15 debug
16 
17 #To keep pppd on the terminal
18 nodetach
19 
20 #hide-password
21 
22 # Accept the peer's idea of our local IP address
23 ipcp-accept-local
24 # Accept the peer's idea of its (remote) IP address
25 ipcp-accept-remote
26 
27 #dial up connetion as the default route
28 defaultroute
29 
30 usepeerdns

# vi /etc/ppp/chat-gprs-connect

 1 #Copyright (c) 2016 guanlei 995318056@qq.com
 2 # This is second part of the ppp dial script. It will perform the connection
 3 #
 4     ABORT           'BUSY'
 5     ABORT           'NO ANSWER'
 6     ABORT           'NO CARRIER'
 7     ABORT           'NO DIALTONE'
 8     ABORT           'ERROR'
 9     ABORT           '\nRING\r\n\r\nRING\r'
10     TIMEOUT         20
11 ''               \rAT
12 #set  apn
13 OK              AT+CGDCONT=1,"IP","cmnet"
14 # ............
15      OK              ATDT*99***1#    //这里要改成相应的运行商的设置
16      SAY             " + requesting data connection\n"
17      CONNECT         ''
18      SAY             " + connected\n"

linux下GPRS模块ppp拨号上网

使能pppd:

# pppd call gprs &  (&表示后台运行)

配置完就可以了,现在可以测试一下上网功能了:

# ping www.baidu.com

PING www.baidu.com (103.235.46.39): 56 data bytes

64 bytes from 103.235.46.39: seq=0 ttl=48 time=555.719 ms

64 bytes from 103.235.46.39: seq=1 ttl=48 time=273.481 ms

 

--- www.baidu.com ping statistics ---

3 packets transmitted, 2 packets received, 33% packet loss

round-trip min/avg/max = 273.481/414.600/555.719 ms

# ifconfig

ppp0      Link encap:Point-to-Point Protocol  

          inet addr:10.110.1.110  P-t-P:192.200.1.21  Mask:255.255.255.255

          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1

          RX packets:10 errors:0 dropped:0 overruns:0 frame:0

          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:3 

          RX bytes:686 (686.0 B)  TX bytes:557 (557.0 B)