轉(zhuǎn)載地址：http://www.eeworld.com.cn/mcu/article_2016062027121.html

我的編程環(huán)境是vmware + fedora9,?ARM目標(biāo)板為ATMEL 9G45，LINUX內(nèi)核2.6.30， GPRS模塊為T(mén)ELIT公司的GC864-DUAL-V2，使用3線制串口連接（TXD RXD GND）

1.修改2.6.30內(nèi)核選項(xiàng)，
?make menuconfig
Device drivers -> Networking device support -> PPP(point to point protocol) support
?我選了以下模塊(以M方式即module方式)
PPP support for async serial ports
PPP support for sync tty ports
PPP Deflate compression
PPP BSD-Compress compression
SLIP(serial line) support
之后編譯：make && make install && make modules && make modules_install
得到了幾個(gè)ko形式的內(nèi)核庫(kù)文件，拷貝它們到ARM目標(biāo)板上，并在/etc/init.d/rcS中動(dòng)態(tài)加載：
insmod /etc/ppp/slhc.ko????????????????????????????????????????
insmod /etc/ppp/ppp_generic.ko?????????????????????????????????
insmod /etc/ppp/ppp_async.ko???????????????????????????????????
insmod /etc/ppp/ppp_synctty.ko?????????????????????????????????
insmod /etc/ppp/ppp_deflate.ko?????????????????????????????????
insmod /etc/ppp/bsd_comp.ko????????????????????????????????????
insmod /etc/ppp/slip.ko
注意加載順序，我記得好象必須把slhc.ko先加載

2. 移植ppp與連接網(wǎng)絡(luò)過(guò)程,??
1) ppp2.4.4 源碼編譯過(guò)程

#./configure

#make CC=arm-linux-gcc 注意指定arm-linux-gcc的路徑，或是直接用絕對(duì)路徑指定

需要拷貝到ARM目標(biāo)板的文件有：
pppd
pppdump
pppstatus
chat
2 ) 腳本準(zhǔn)備
有4個(gè)腳本需要準(zhǔn)備，一個(gè)是規(guī)則文件/etc/ppp/gprs-connect-chat，一個(gè)是參數(shù)文件/etc/ppp/peers/gprs, 還有認(rèn)證文件：pap-secret和chap-secret。（其實(shí)我這里只用到了pap-secret, 至于chap-secret 沒(méi)有有到。anyhow，把它們?nèi)珓?chuàng)建上）
(1) 腳本 #gprs-connect-chat:
TIMEOUT 15
ABORT '\nBUSY\r'
ABORT '\nNO ANSWER\r'
ABORT '\nRINGING\r\n\r\nRINGING\r'
#'' AT
#'OK-+++\c-OK' ATH0
TIMEOUT???????? 40
''????????????? \rAT
OK????????????? AT+FLO=0??????????#這個(gè)是GC864-DUAL-V2特別要設(shè)置的，就是要關(guān)閉流控
OK????????????? ATS0=0
OK????????????? ATE0V1
OK????????????? AT+CGDCONT=1,"IP","CMNET" #連接中國(guó)移動(dòng)cmnet網(wǎng)
OK????????????? ATDT*99*1#
CONNECT???????? ''
(2) 腳本gprsoptions
#/etc/ppp/peers/gprsoptions
# Usage:?? root>pppd call gprsoptions
/dev/ttyS4
115200
nocrtscts
modem
#noauth
#auth
#-pap
#+chap
lock
debug
nodetach
#hide-password
usepeerdns
noipdefault
defaultroute
user cmnet
#user smsong
0.0.0.0:0.0.0.0
ipcp-accept-local
#ipcp-accept-remote
#lcp-echo-failure? 12
#lcp-echo-interval 3?
noccp????????????????
#novj????????????????
#novjccomp???????????
persist??????????????
connect '/etc/ppp/chat -s -v -f /etc/ppp/gprs-connect-chat'
(3) 認(rèn)證文件pap-secrets?根據(jù)需要來(lái)改
/etc/ppp # cat pap-secrets?
# Secrets for authentication using PAP
# client??? server???? secret??????????????????? IP addresses
cmnet?? *?????? cmnet?? *
(4) 認(rèn)證文件 chap-secrets 根據(jù)需要來(lái)修改，現(xiàn)在暫時(shí)沒(méi)用到
/etc/ppp # cat chap-secrets?
# Secrets for authentication using CHAP
# client??? server???? secret??????????????????? IP addresses
''????? *?????? ''????? *

3） 調(diào)用過(guò)程
ifconfig eth0 down //先關(guān)閉有線網(wǎng)卡，以免與拔號(hào)初始化沖突
/etc/ppp/pppd call gprs& //啟動(dòng)/etc/ppp/peers/gprs腳本
ifconfig eth0 up //重新開(kāi)有線網(wǎng)卡
來(lái)看連接的顯示日志內(nèi)容：
/etc/ppp # ./pppd call gprs&
/etc/ppp # timeout set to 15 seconds
abort on (\nBUSY\r)
abort on (\nNO ANSWER\r)
abort on (\nRINGING\r\n\r\nRINGING\r)
timeout set to 40 seconds
send (^MAT^M)
expect (OK)
AT^M^M
OK
?-- got it

send (AT+FLO=0^M)
expect (OK)
^M
AT+FLO=0^M^M
OK
?-- got it

send (ATS0=0^M)
expect (OK)
^M
ATS0=0^M^M
OK
?-- got it

send (ATE0V1^M)
expect (OK)
^M
ATE0V1^M^M
OK
?-- got it

send (AT+CGDCONT=1,"IP","CMNET"^M)
expect (OK)
^M
^M
OK
?-- got it

send (ATDT*99*1#^M)
expect (CONNECT)
^M
^M
CONNECT
?-- got it

send (^M)
Serial connection established.
using channel 1
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS4
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [LCP ConfReq id=0x1?]
rcvd [LCP ConfAck id=0x1?]
rcvd [LCP ConfReq id=0x1?]
sent [LCP ConfAck id=0x1?]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [PAP AuthReq id=0x1 user="cmnet" password=]
rcvd [PAP AuthAck id=0x1 "Welcome!"]
Remote message: Welcome!
PAP authentication succeeded
sent [IPCP ConfReq id=0x1?]
rcvd [IPCP ConfReq id=0x1?]
sent [IPCP ConfAck id=0x1?]
rcvd [IPCP ConfRej id=0x1?]
sent [IPCP ConfReq id=0x2?]
rcvd [IPCP ConfNak id=0x2?]
sent [IPCP ConfReq id=0x3?]
rcvd [IPCP ConfAck id=0x3?]
local? IP address 10.176.120.186
remote IP address 192.168.202.0
primary?? DNS address 218.201.96.130
secondary DNS address 211.137.191.26

4)? 查看網(wǎng)絡(luò)設(shè)置與ping實(shí)驗(yàn)
/etc/ppp # ifconfig
lo??????? Link encap:Local Loopback??
????????? inet addr:127.0.0.1? Mask:255.0.0.0
????????? UP LOOPBACK RUNNING? MTU:16436? Metric:1
????????? RX packets:0 errors:0 dropped:0 overruns:0 frame:0
????????? TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
????????? collisions:0 txqueuelen:0?
????????? RX bytes:0 (0.0 B)? TX bytes:0 (0.0 B)

ppp0????? Link encap:Point-to-Point Protocol??
????????? inet addr:10.176.120.186? P-t-P:192.168.202.0? Mask:255.255.255.255
????????? UP POINTOPOINT RUNNING NOARP MULTICAST? MTU:1500? Metric:1
????????? RX packets:4 errors:0 dropped:0 overruns:0 frame:0
????????? TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
????????? collisions:0 txqueuelen:3?
????????? RX bytes:64 (64.0 B)? TX bytes:82 (82.0 B)
來(lái)ping 一下看看
/etc/ppp # ping www.163.com -c 3
PING www.163.com (221.204.240.161): 56 data bytes
64 bytes from 221.204.240.161: seq=0 ttl=46 time=466.873 ms
64 bytes from 221.204.240.161: seq=1 ttl=46 time=435.762 ms
64 bytes from 221.204.240.161: seq=2 ttl=46 time=414.000 ms

--- www.163.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 414.000/438.878/466.873 ms

3.其它問(wèn)題

1 )? 設(shè)置DNS地址
/etc/ppp 下會(huì)由拔號(hào)自動(dòng)產(chǎn)生resolv.conf 文件， 但它和 /etc/resolv.conf 并不是同一個(gè)文件，所以有的時(shí)候不能解析DNS。
一個(gè)好辦法是，首先保證存在/etc/resolv.conf, 然后在/etc/ppp下創(chuàng)建軟鏈接ln -s /etc/ppp/resolv.conf /etc/resolv.conf
這樣在拔號(hào)成功后，在/etc/resolv.conf中會(huì)有類似以下內(nèi)容：
nameserver 218.201.96.130
nameserver 211.137.191.26
2） 只能ping IP地址，不能ping域名的現(xiàn)象
在busybox的命令幫助頁(yè)面有這樣一段話：
引用:
LIBC NSS
When used with glibc, the BusyBox 'networking' applets will similarly require that you install at least some of the glibc NSS stuff (in particular, /etc/nsswitch.conf, /lib/libnss_dns*, /lib/libnss_files*, and /lib/libresolv*).
于是把a(bǔ)rm-linux工具鏈的lib目錄下的 libnss_dns* , libnss_files* , libresolv* 拷貝到ARM目標(biāo)板的/lib下。可以ping域名啦?
/etc/ppp # ping www.163.com
PING www.163.com (221.204.240.161): 56 data bytes
64 bytes from 221.204.240.161: seq=0 ttl=46 time=641.269 ms
64 bytes from 221.204.240.161: seq=1 ttl=46 time=435.801 ms
64 bytes from 221.204.240.161: seq=2 ttl=46 time=446.776 ms
64 bytes from 221.204.240.161: seq=3 ttl=46 time=381.381 ms
64 bytes from 221.204.240.161: seq=4 ttl=46 time=468.495 ms

--- www.163.com ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 381.381/474.744/641.269 ms


3） 如何實(shí)現(xiàn)拔號(hào)與中國(guó)聯(lián)通的3G 聯(lián)網(wǎng)？
換用TELIT公司的UC864-E， 使用USB連接方式。指定串口為ttyUSB0
對(duì)于ppp方面，只需要更改4個(gè)腳本中的少量?jī)?nèi)容
a. 更改options腳本
? 把gprsoptions更名為g3options, 把里面的這一行參數(shù)/dev/ttyS4 更改為/dev/ttyUSB0，
把connect '/etc/ppp/chat -s -v -f /etc/ppp/gprs-connect-chat'
更改為connect '/etc/ppp/chat -s -v -f?/etc/ppp/g3-connect-chat'
b. 更改chat腳本
TIMEOUT 15
ABORT '\nBUSY\r'
ABORT '\nNO ANSWER\r'
ABORT '\nRINGING\r\n\r\nRINGING\r'
#'' AT
#'OK-+++\c-OK' ATH0
TIMEOUT???????? 40
''????????????? \rAT
OK????????????? AT+FLO=0
OK????????????? ATS0=0
OK????????????? ATE0V1
OK????????????? AT+CGDCONT=1,"IP","UNINET"?#UNINET是代表中國(guó)聯(lián)通網(wǎng)的意思
#OK????????????? AT+CGDCONT=1,"IP","CMNET"
OK????????????? ATDT*99*1#
CONNECT????
c. 更改pap-secrets
# Secrets for authentication using PAP
# client??? server???? secret??????????????????? IP addresses
#cmnet?? *?????? cmnet?? *? #如果是中國(guó)移動(dòng)GPRS就用cmnet
uninet *?????? uninet? * #如果是中國(guó)聯(lián)通3G就用uninet

d. 更改chap-secrets
同上pap-secrets

總結(jié)

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