在android 4.2.2上调试MU609步骤，WCDMA
这篇为转载文章，但是有一点需要说明的是：不管是在linux还是android的平台下调试3G模块，如果调试过程中提示以下错误：
NO CARRIER
那么就是没接天线导致的，收不到3G信号。遇到此情况时，接上天线即可。
下面是转载内容：
1.修改kernel\drivers\usb\serial\option.c，添加MU609的ID号
- #define HUAWEI_PRODUCT_E353 0x1506
- 更新了firmware之后ID号改为：
- #define HUAWEI_PRODUCT_E353 0x1573
2.对kernel进行配置，make menuconfig打开以下几项
- Device Drivers -> USB support -> USB Serial Converter support -><*> USB driver for GSM and CDMA modems
- Device Drivers -> Network device support -> PPP (point-to-point protocol) support -><*> PPP MPPE compression (encryption) (EXPERIMENTAL)
- Device Drivers -> Network device support -> PPP (point-to-point protocol) support -><*> PPP support for async serial ports
第一个选项打开之后开机就会识别到MU609为GSM modem，否则只会看到有USB插拔的信息，不会识别为GSM MODEM，正确识别后的Log如下：
- <6>[ 1.929557] usb 3-1: new high-speed USB device number 2 using exynos-xhci
- <6>[ 1.949389] usb 3-1: New USB device found,idVendor=12d1,idProduct=1506
- <6>[ 1.949483] usb 3-1: New USB device strings:Mfr=3, Product=2, SerialNumber=0
- <6>[ 1.949595] usb 3-1: Product: HUAWEI Mobile
- <6>[ 1.949645] usb 3-1: Manufacturer: Huawei Technologies
- <6>[ 1.949950] mmc_host mmc1: Bus speed (slot 0) = 25000000Hz (slot req 400000Hz, actual 390625HZdiv = 32)
- <6>[ 1.956711] option 3-1:1.0: GSM modem (1-port) converter detected
- <6>[ 1.956911] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB0
- <6>[ 1.957187] option 3-1:1.1: GSM modem (1-port) converter detected
- <6>[ 1.957353] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB1
- <6>[ 1.957588] option 3-1:1.2: GSM modem (1-port) converter detected
- <6>[ 1.957729] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB2
第二和第三个选项打开之后pppd才可以建立ppp0接口，否则logcat会出现如下pppd错误信息：
- Couldn't set tty to PPP discipline: Invalid argument
此时虽然rild已经运行，apn也设置好了但是仍旧无法上网，netcfg看不到ppp0接口。
3.copy libhuawei-ril.so,ip-up,ip-down到指定位置，修改device.mk，添加：
- # stone add mu609
- PRODUCT_COPY_FILES += \
- $(LOCAL_PATH)/mu609/libhuawei-ril.so:system/lib/libhuawei-ril.so \
- $(LOCAL_PATH)/mu609/ip-up:system/etc/ppp/ip-up \
- $(LOCAL_PATH)/mu609/ip-down:system/etc/ppp/ip-down \
- $(LOCAL_PATH)/mu609/chat:system/bin/chat \
- $(LOCAL_PATH)/mu609/busybox:system/bin/busybox
最后两个chat和busybox是为了调试方便加进去的。
4.修改android\system\core\rootdir\init.rc,添加ttyUSB权限和ril的加载
- on boot
- # stone add mu609
- chmod 777 /dev/ttyUSB0
- chmod 777 /dev/ttyUSB2
- chmod 777 /etc/ppp/ip-up
- chmod 777 /etc/ppp/ip-down
- # stone modify mu609
- service ril-daemon /system/bin/rild -l libhuawei-ril.so
5.修改android\hardware\ril\rild\rild.c,按照mu609 porting guide屏蔽掉switchUser();这行代码，如果不屏蔽掉会出现手动拨号正常，但是android下提示pppd缺少模块的情况，如下：
- E/pppd ( 2082): This system lacks kernel support for PPP. This could be because
- E/pppd ( 2082): the PPP kernel module could not be loaded, or because PPP was not
- E/pppd ( 2082): included in the kernel configuration. If PPP was included as a
- E/pppd ( 2082): module, try `/sbin/modprobe -v ppp'. If that fails, check that
- E/pppd ( 2082): ppp.o exists in /lib/modules/`uname -r`/net.
- E/pppd ( 2082): See README.linux file in the ppp distribution for more details.
到此就已经porting完了，如果出问题了还要排查，现在从底层开始一步步排查验证。
1.首先要确定mu609模块识别到了没有，可以在shell下busybox lsusb查看usb设备，如果出现如下信息，就是已经识别到mu609了。
- shell@android:/ # busybox lsusb
- Bus 003 Device 002: ID 12d1:1506
2.查看ttyUSB接口属性是否修改为0777
- shell@android:/ # ll /dev/ttyUSB*
- crwxrwxrwx root root 188, 0 2013-05-15 12:01 ttyUSB0
- crw------- root root 188, 1 2013-05-15 12:00 ttyUSB1
- crwxrwxrwx root root 188, 2 2013-05-15 12:00 ttyUSB2
3.模块已经识别了，ttyUSB接口都有，现在手动发AT命令看mu609是否响应。
- shell@android:/ # cd /dev/
- shell@android:/dev # cat ttyUSB0 &
- [1] 869
- shell@android:/dev # echo AT+CGMI > ttyUSB0
- shell@android:/dev #
- Huawei Technologies Co., Ltd.
- OK
- shell@android:/dev # echo AT+CGMM > ttyUSB0
- shell@android:/dev #
- MU609
- OK
- shell@android:/dev #
OK，mu609正常响应了。
4.现在先抛开上层RIL不管，单纯从shell手动拨号看能否正常工作。需要自己写两个脚本，拷贝到/etc/ppp目录下
第一个脚本是/etc/ppp/chat/unicom,内容如下:
- # this is the chat script for unicom
- ABORT "NO CARRIER"
- ABORT "NO DIALTONE"
- ABORT "ERROR"
- ABORT "NO ANSWER"
- ABORT "BUSY"
- TIMEOUT 120
- "" at
- OK AT+CGDCONT=1,"IP","3gnet"
- OK atdt*99***1#
- CONNECT
第二个脚本是/etc/ppp/peers/unicom,内容如下:
- # /system/etc/ppp/peers/unicom
- /dev/ttyUSB0
- 115200
- crtscts
- connect '/system/bin/chat -s -v -f /system/etc/ppp/chat/unicom'
- debug
- nodetach
- ipcp-accept-local
- ipcp-accept-remote
- defaultroute
- usepeerdns
- user card
- password card
chat和peers两个目录没有，需要自己mkdir。还需要用到chat，就是之前在device.mk中copy过来的，android自身不带，在我的资源中有编译好的。因为rild一开始就会启动，把pppd搞起来，影响手动拨号，所以要先把rild改个名字，这样rild服务就不会起来了
- mv /system/bin/rild /system/bin/ril-d
改完后记得重启机器。好了，现在可以手动拨号了:
- shell@android:/ # pppd call unicom &
- [1] 912
- shell@android:/ # abort on (NO CARRIER)
- abort on (NO DIALTONE)
- abort on (ERROR)
- abort on (NO ANSWER)
- abort on (BUSY)
- timeout set to 120 seconds
- send (at^M)
- expect (OK)
- ^M
- OK
- -- got it
- send (AT+CGDCONT=1,"IP","3gnet"^M)
- expect (OK)
- ^M
- ^M
- OK
- -- got it
- send (atdt*99***1#^M)
- expect (CONNECT)
- ^M
- ^M
- CONNECT
- -- got it
- shell@android:/ #
好了，到这里就算是拨号成功了，然后看ppp0接口是否建立。
- shell@android:/ # netcfg
- ip6tnl0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
- lo UP 127.0.0.1/8 0x00000049 00:00:00:00:00:00
- ppp0 UP 10.105.219.114/32 0x000010d1 00:00:00:00:00:00
- sit0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
- shell@android:/ #
好了，ppp0接口也建立了，ip地址也获得了，ping一下baidu试试看。
- shell@android:/ # ping www.baidu.com
- PING www.a.shifen.com (220.181.112.143) 56(84) bytes of data.
- 64 bytes from 220.181.112.143: icmp_seq=1 ttl=48 time=164 ms
- 64 bytes from 220.181.112.143: icmp_seq=2 ttl=48 time=172 ms
- 64 bytes from 220.181.112.143: icmp_seq=3 ttl=48 time=160 ms
- ^C64 bytes from 220.181.112.143: icmp_seq=4 ttl=48 time=148 ms
- --- www.a.shifen.com ping statistics ---
- 4 packets transmitted, 4 received, 0% packet loss, time 3005ms
- rtt min/avg/max/mdev = 148.703/161.427/172.377/8.508 ms
- shell@android:/ #
OK，一切正常，现在可以确定拨号没有问题了，剩下验证android上层ril是否工作正常了。
5.把rild的名字改回来，进入系统设置一下APN,
- APN:3gnet
- MCC:460
- MNC:01
保存，然后重启，起来后就可以在状态栏看到3G的图标了，当然要打开“启动数据网络”选项。
如果没有工作，就"logcat -b radio &"看一下ril的log，ril是否认到ttyUSB的接口了。
调试时候经常用到的几个小命令。
netcfg : 查看当前所有网络接口
getprop net.dns1 : 查看dns(有时候dns不对也会上不了网，比如8.8.8.8，这时候需要修改pppd)
logcat -s pppd : 查看pppd log
logcat -b radio &: 查看radio log
cat ttyUSB0 &然后echo AT+CMD > ttyUSB0: 对modem发命令看是否有应答。