Template:FriendlyCoreAllwinnerH3/zh

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1 连接USB摄像头模块(FA-CAM202)

FA-CAM202是一款200万像素的USB摄像头模块，连接开发板和摄像头，然后上电启动系统，连接网络，以root用户登录终端并编译运行mjpg-streamer: 

$ cd /root/C/mjpg-streamer
$ make
$ ./start.sh

请自行修改start.sh, 确保使用正确的/dev/videoX节点, 下列命令可以用来确定摄像头的video节点: 

$ apt-get install v4l-utils
$ v4l2-ctl -d /dev/video0 -D
# fa-cam202有2个型号
Driver Info (not using libv4l2):
        Driver name   : uvcvideo
        Card type     : HC 3358+2100: HC 3358+2100  / USB 2.0 Camera: USB 2.0 Camera
        Bus info      : usb-1c1b000.usb-1
	...

上述信息表示/dev/video0是摄像头的设备节点。mjpg-streamer是一个开源的网络视频流服务器，在板子上成功运行mjpg-streamer后会打印下列信息: 

$ ./start.sh 
 i: Using V4L2 device.: /dev/video0
 i: Desired Resolution: 1280 x 720
 i: Frames Per Second.: 30
 i: Format............: YUV
 i: JPEG Quality......: 90
 o: www-folder-path...: ./www/
 o: HTTP TCP port.....: 8080
 o: username:password.: disabled
 o: commands..........: enabled

start.sh脚本里执行了下列2个命令: 

export LD_LIBRARY_PATH="$(pwd)"
./mjpg_streamer -i "./input_uvc.so -d /dev/video0 -y 1 -r 1280x720 -f 30 -q 90 -n -fb 0" -o "./output_http.so -w ./www"

mjpg_streamer相关参数的含义如下:
-i: 选择输入插件，input_uvc.so表示从摄像头采集数据;
-o: 选择输出插件，output_http.so表示使用http协议传输数据;
-d: 输入插件的子参数，指定摄像头设备节点;
-y: 输入插件的子参数，指定摄像头采集数据的格式，1:yuyv, 2:yvyu, 3:uyvy 4:vyuy，如果不使用-y参数，则表示采集MJPEG格式;
-r: 输入插件的子参数，指定摄像头采集分辨率;
-f: 输入插件的子参数，指定想使用的摄像头采集fps，具体是否支持依赖于驱动;
-q: 输入插件的子参数，指定libjpeg软编码的图像质量;
-n: 输入插件的子参数, 禁止dynctrls功能;
-fb: 输入插件的子参数, 指定是否在/dev/fbX上显示采集的图像;
-w: 输出插件的子参数, 指定包含网页的目录;

成功运行start.sh脚本后，假设开发板的IP地址为192.168.1.230，在PC的浏览器中输入 192.168.1.230:8080 就能浏览摄像头采集的画面了，效果如下:
mjpg-streamer-cam500a

2 查看CPU温度和频率

命令行查看: 

$ cpu_freq 
Aavailable frequency(KHz):
        480000 624000 816000 1008000
Current frequency(KHz):
        CPU0 online=1 temp=26548C governor=ondemand freq=624000KHz
        CPU1 online=1 temp=26548C governor=ondemand freq=624000KHz
        CPU2 online=1 temp=26548C governor=ondemand freq=624000KHz
        CPU3 online=1 temp=26548C governor=ondemand freq=624000KHz

上述信息表示当前有4个CPU核在线, 温度均约为26.5摄氏度, 运行的策略均为根据需求来决定运行频率, 当前的运行频率均为624MHz，设置频率的命令如下： 

$ cpu_freq -s 1008000
Aavailable frequency(KHz):
        480000 624000 816000 1008000
Current frequency(KHz):
        CPU0 online=1 temp=36702C governor=userspace freq=1008000KHz
        CPU1 online=1 temp=36702C governor=userspace freq=1008000KHz
        CPU2 online=1 temp=36702C governor=userspace freq=1008000KHz
        CPU3 online=1 temp=36702C governor=userspace freq=1008000KHz

上述命令将４个CPU核的频率设置为1008MHz。


3 运行Qt示例程序

执行以下命令：

$ sudo /opt/QtE-Demo/run.sh

运行结果如下，这是一个开源的QtDemo:
K2-QtE

4 Docker在armhf系统下的安装与使用

4.1 安装 Docker

执行下列命令：

sudo apt-get update
sudo apt-get install docker.io

4.2 测试 Docker

执行下列命令运行一个简单的docker image: 

git clone https://github.com/friendlyarm/debian-jessie-arm-docker
cd debian-jessie-arm-docker
./rebuild-image.sh
./run.sh

5 FriendlyCore下使用4G模块EC20

5.1 第0步：将SIM卡插入到EC20中

5.2 第1步：在开发板上编译quectel-CM命令行拨号程序

输入以下命令，编译并安装quectel-CM到 /usr/bin/ 目录： 

git clone https://github.com/friendlyarm/quectel-cm.git
cd quectel-cm/
make
cp quectel-CM /usr/bin/

5.3 第2步：创建udhcpc script

quectel-CM程序会将运营商返回的IP、DNS等作为参数调用udhcpc script，这个脚本是不存在的，我们需要自已创建一个，请用你熟悉的编辑器创建一个新文件，文件名为：/usr/share/udhcpc/default.script，内容如下： 

#!/bin/sh
 
# udhcpc script edited by Tim Riker <Tim@Rikers.org>
 
[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
 
RESOLV_CONF="/etc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
 
case "$1" in
  deconfig)
    /sbin/ifconfig $interface 0.0.0.0
    ;;
 
  renew|bound)
    /sbin/ifconfig $interface $ip $BROADCAST $NETMASK
 
    if [ -n "$router" ] ; then
      echo "deleting routers"
      while route del default gw 0.0.0.0 dev $interface ; do
        :
      done
 
      for i in $router ; do
        route add default gw $i dev $interface
      done
    fi
 
    echo -n > $RESOLV_CONF
    [ -n "$domain" ] && echo search $domain >> $RESOLV_CONF
    for i in $dns ; do
      echo adding dns $i
      echo nameserver $i >> $RESOLV_CONF
    done
    ;;
esac
 
exit 0

保存后，再用以下命令赋于可执行权限： 

chmod 755 /usr/share/udhcpc/default.script

5.4 第3步：开始4G拨号

输入以下命令启动拨号： 

quectel-CM &

拨号成功，屏幕会输出IP地址等信息，如下所示： 

root@NanoPC-T4:~# quectel-CM &
[1] 5364
root@NanoPC-T4:~# [05-15_08:23:13:719] WCDMA&LTE_QConnectManager_Linux&Android_V1.1.34
[05-15_08:23:13:720] quectel-CM profile[1] = (null)/(null)/(null)/0, pincode = (null)
[05-15_08:23:13:721] Find /sys/bus/usb/devices/3-1 idVendor=2c7c idProduct=0125
[05-15_08:23:13:722] Find /sys/bus/usb/devices/3-1:1.4/net/wwan0
[05-15_08:23:13:722] Find usbnet_adapter = wwan0
[05-15_08:23:13:723] Find /sys/bus/usb/devices/3-1:1.4/usbmisc/cdc-wdm0
[05-15_08:23:13:723] Find qmichannel = /dev/cdc-wdm0
[05-15_08:23:13:739] cdc_wdm_fd = 7
[05-15_08:23:13:819] Get clientWDS = 18
[05-15_08:23:13:851] Get clientDMS = 2
[05-15_08:23:13:884] Get clientNAS = 2
[05-15_08:23:13:915] Get clientUIM = 1
[05-15_08:23:13:947] Get clientWDA = 1
[05-15_08:23:13:979] requestBaseBandVersion EC20CEFHLGR06A01M1G_OCPU_BETA1210
[05-15_08:23:14:043] requestSetEthMode QMUXResult = 0x1, QMUXError = 0x46
[05-15_08:23:14:075] requestGetSIMStatus SIMStatus: SIM_READY
[05-15_08:23:14:107] requestGetProfile[1] cmnet///0
[05-15_08:23:14:139] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE
[05-15_08:23:14:171] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[05-15_08:23:14:235] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE
[05-15_08:23:14:938] requestSetupDataCall WdsConnectionIPv4Handle: 0xe16e4540
[05-15_08:23:15:002] requestQueryDataCall IPv4ConnectionStatus: CONNECTED
[05-15_08:23:15:036] ifconfig wwan0 up
[05-15_08:23:15:052] busybox udhcpc -f -n -q -t 5 -i wwan0
[05-15_08:23:15:062] udhcpc (v1.23.2) started
[05-15_08:23:15:077] Sending discover...
[05-15_08:23:15:093] Sending select for 10.22.195.252...
[05-15_08:23:15:105] Lease of 10.22.195.252 obtained, lease time 7200
[05-15_08:23:15:118] deleting routers
SIOCDELRT: No such process
[05-15_08:23:15:132] adding dns 221.179.38.7
[05-15_08:23:15:132] adding dns 120.196.165.7

5.5 测试4G连接

ping一个域名，看看DNS解析是否已经在工作了： 

root@NanoPC-T4:~# ping www.baidu.com
PING www.a.shifen.com (183.232.231.174) 56(84) bytes of data.
64 bytes from 183.232.231.174 (183.232.231.174): icmp_seq=1 ttl=56 time=74.3 ms
64 bytes from 183.232.231.174 (183.232.231.174): icmp_seq=2 ttl=56 time=25.1 ms
64 bytes from 183.232.231.174 (183.232.231.174): icmp_seq=3 ttl=56 time=30.8 ms
64 bytes from 183.232.231.174 (183.232.231.174): icmp_seq=4 ttl=56 time=29.1 ms
64 bytes from 183.232.231.174 (183.232.231.174): icmp_seq=5 ttl=56 time=29.2 ms

5.6 测试4G的网速

wget -O - https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python

得到的测试结果类拟如下这样： 

Retrieving speedtest.net configuration...
Testing from China Mobile Guangdong (117.136.40.167)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by ChinaTelecom-GZ (Guangzhou) [2.51 km]: 62.726 ms
Testing download speed................................................................................
Download: 32.93 Mbit/s
Testing upload speed................................................................................................
Upload: 5.58 Mbit/s


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