Difference between revisions of "NanoPC-T2"

Revision as of 05:57, 4 March 2016

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1 Introduction

Overview

Front

Back

• The NanoPC-T2 quad core Cortex A9 single board computer is designed and developed by FriendlyARM for professional and enterprise users. It uses Samsung Quad Core Cortex-A9 S5P4418 SoC with dynamic frequency scaling up to 1.4GHz. Compared to FriendlyARM's existing 4418 based boards the NanoPC-T2 has 8G eMMC onboard, audio jack and video input/output interfaces. Compared to its predecessor the NanoPC-T1 the NanoPC-T2 has built-in WiFi, Bluetooth and Gbps Ethernet port. In addition the NanoPC-T2 has power management which the NanoPC-T1 doesn't support. To avoid overheat issues the NanoPC-T2 has a heat sink with mounting holes.
• The NanoPC-T2 combines all the ports and interfaces the existing FriendlyARM 4418 boards have. Currently it has the most interfaces and ports among all existing ARM boards of this size. Its rich video interfaces and support for HDMI 1080P make it work with not only popular display devices but also various FriendlyARM LCDs with both resistive touch and capacitive touch.
• The NanoPC-T2 is FriendlyARM's most complete solution based on Samsung 4418 for both commercial and industrial applications.

2 Features

• SoC： Samsung S5P4418 Quad Core Cortex-A9 with dynamic frequency scaling up to 1.4G Hz
• Power Management Unit： AXP228 PMU, it supports software power-off and wake-up.
• System Memory： 1GB 32bit DDR3 RAM
• eMMC： 8GB
• Storage： 1 x SD Card Socket
• Ethernet： Gbps Ethernet Port (RTL8211E)
• WiFi： 802.11b/g/n
• Bluetooth： 4.0 dual mode
• Antenna： Porcelain Antenna IPX Interface
• Video Input: DVP Camera/MIPI-CSI (two camera interfaces)
• Video Output: HDMI Type-A / LVDS / LCD / MIPI DSI (four video output interfaces)
• Audio: 3.5 mm audio jack / via HDMI
• Microphone: 1 x onboard Microphone
• USB: 4 x USB 2.0 Host, two standard type A ports and two 2.54mm pitch pin headers
• MicroUSB: 1 x MicroUSB 2.0 Client, Type A
• LCD Interface： 0.5mm pitch 45 pin FPC seat, full color RGB 8-8-8
• HDMI: 1.4A Type A, 1080P
• DVP Camera: 0.5mm pitch 24 pin FPC seat
• GPIO: 2.54 mm pitch 30 pin header
• Serial Debug Port: 2.54mm pitch 4pin header
• LED: 1 x power LED , 2 x GPIO LED
• User Key: 1 x K1 (power), 1 x Reset
• RTC Battery： RTC Seat Pins
• Power: DC 5V/2A
• Heat Sink: 1 x Heat Sink with mounting holes
• PCB: Six Layer
• PCB Dimension: 100 mm x 60 mm
• OS/Software: u-boot, Android5.1, Debian8

3 Diagram, Layout and Dimension

3.1 Layout

NanoPC-T2 Layout

• 30Pin GPIO Pin Spec

Pin#	Name	Pin#	Name
1	SYS_3.3V	2	DGND
3	UART2_TX/GPIOD20	4	UART2_RX/GPIOD16
5	I2C0_SCL	6	I2C0_SDA
7	SPI0_MOSI/GPIOC31	8	SPI0_MISO/GPIOD0
9	SPI0_CLK/GPIOC29	10	SPI0_CS/GPIOC30
11	UART3_TX/GPIOD21	12	UART3_RX/GPIOD17
13	UART4_TX/GPIOB29	14	UART4_RX/GPIOB28
15	GPIOB31	16	GPIOB30
17	GPIOC4	18	GPIOC7
19	GPIOC8	20	GPIOC24
21	GPIOC28	22	GPIOB26
23	GPIOD1/PWM0	24	GPIOD8/PPM
25	GPIOC13/PWM1	26	AliveGPIO3
27	GPIOC14/PWM2	28	AliveGPIO5
29	VDD_5V	30	DGND

• 20Pin LVDS Interface Pin Spec

Pin#	Name	Pin#	Name
1	SYS_3.3V	2	SYS_3.3V
3	GPIOC16	4	GPIOB18
5	DGND	6	DGND
7	LVDS_D0-	8	LVDS_D0+
9	LVDS_D1-	10	LVDS_D1+
11	LVDS_D2-	12	LVDS_D2+
13	DGND	14	DGND
15	LVDS_CLK-	16	LVDS_CLK+
17	LVDS_D3-	18	LVDS_D3+
19	I2C2_SCL	20	I2C2_SDA

• DVP Camera Interface Pin Spec

Pin#	Name
1, 2	SYS_3.3V
7,9,13,15,24	DGND
3	I2C0_SCL
4	I2C0_SDA
5	GPIOB14
6	GPIOB16
8,10	NC
11	VSYNC
12	HREF
14	PCLK
16-23	Data bit7-0

• RGB LCD IF Pin Spec

Pin#	Name	Description
1, 2	VDD_5V	5V Output, it can be used to power LCD modules
11，20，29, 37，38，39，40, 45	DGND	Ground
3-10	Blue LSB to MSB	RGB blue
12-19	Green LSB to MSB	RGB green
21-28	Red LSB to MSB	RGB red
30	GPIOB25	available for users
31	GPIOC15	occupied by FriendlyARM one wire technology to recognize LCD models and control backlight and implement resistive touch, not applicable for users
32	XnRSTOUT Form CPU	low when system is reset
33	VDEN	signal the external LCD that data is valid on the data bus
34	VSYNC	vertical synchronization
35	HSYNC	horizontal synchronization
36	LCDCLK	LCD clock, Pixel frequency
41	I2C2_SCL	I2C2 clock signal, for capacitive touch's data transmission
42	I2C2_SDA	I2C2 data signal, for capacitive touch's data transmission
43	GPIOC16	interrupt pin for capacitive touch, used with I2C2
44	NC	Not connected

• MIPI-DSI Interface Pin Spec

Pin#	Name
1, 2, 3	VDD_5V
4	DGND
5	I2C2_SDA
6	I2C2_SCL
7	DGND
8	GPIOC0
9	DGND
10	GPIOC1
11	DGND
12	GPIOA28
13	nRESETOUT
14, 15	DGND
16	MIPIDSI_DN3
17	MIPIDSI_DP3
18	DGND
19	MIPIDSI_DN2
20	MIPIDSI_DP2
21	DGND
22	MIPIDSI_DN1
23	MIPIDSI_DP1
24	DGND
25	MIPIDSI_DN0
26	MIPIDSI_DP0
27	DGND
28	MIPIDSI_DNCLK
29	MIPIDSI_DPCLK
30	DGND

• MIPI-CSI Interface Pin Spec

Pin#	Name
1, 2	SYS_3.3V
3	DGND
4	I2C0_SDA
5	I2C0_SCL
6	DGND
7	SPI2_MOSI/GPIOC12
8	SPI2_MISO/GPIOC11
9	SPI2_CS/GPIOC10
10	SPI2_CLK/GPIOC9
11	DGND
12	GPIOB9
13	GPIOC2
14, 15	DGND
16	MIPICSI_DN3
17	MIPICSI_DP3
18	DGND
19	MIPICSI_DN2
20	MIPICSI_DP2
21	DGND
22	MIPICSI_DN1
23	MIPICSI_DP1
24	DGND
25	MIPICSI_DN0
26	MIPICSI_DP0
27	DGND
28	MIPICSI_DNCLK
29	MIPICSI_DPCLK
30	DGND

Note:

1. SYS_3.3V: 3.3V power output
2. VDD_5V: 5V power input/output. The input range is 4.7V ~ 5.6V
3. For more details please refer to the document: NanoPC-T2_1601B_Schematic.pdf

3.2 Board Dimension

For more details please refer to the document: NanoPC-T2-1601B-Dimensions(dxf).zip

4 Get Started

4.1 Essentials You Need

Before play with your NanoPC-T2 please get the following items ready

• NanoPC-T2
• SD Card: Class 10 or Above, minimum 8GB SDHC
• A DC 5V/2A power is a must
• HDMI monitor or LCD
• USB keyboard, mouse and possible a USB hub(or a TTL to serial board)
• A Host running Ubuntu 14.04 64 bit system

4.2 Make an Installation SD Card

4.2.1 Boot NanoPC-T2 from SD Card

Please get the following files from here download link:

• Please get a 4G SDHC card and backup its data if necessary.
  

For LCD or HDMI output please use the following files:
nanopi2-debian-sd4g.img.zip	Debian image files
nanopi2-android-sd4g.img.zip	Android image files
Flash Utility:
win32diskimager.rar	Windows utility. Under Linux users can use "dd"

• Please uncompress these files. Insert an SD card(at least 4G) to a Windows PC, run the win32diskimager utility as administrator，On the utility's main window select your SD card's drive and the image files and click on "write" to start flashing the SD card.
  
• Please insert this card to your NanoPC-T2's boot socket, press and hold the boot key and power on (with a 5V/2A power source). If the red LED is on and green power LED is blinking this indicates your NanoPC-T2 is successfully booted.
  

4.2.2 Boot NanoPC-T2 from eMMC

• Download RAW Image
  

Please get the image file: nanopi2-eflasher-sd4g.img.zip and the Windows utility: win32diskimager.rar;

• Flash RAW Image to SD Card
  

Please insert an SD card(at least 4G) to a Windows PC, run the win32diskimager utility as administrator，On the utility's main window select your SD card's drive and the image files and click on "write" to start flashing the SD card

• Prepare RAW image

Please go to this link [1] to downlaod Android and Debian image files(System-image-files-for-eMMC). After download please untar the ".tgz" ball and copy the files to your SD card.

OS	Image	Files	Copy to...
Android 5.1	android-lollipop-images.tgz android-lollipop-images.tgz.hash.md5	boot.img system.img userdata.img cache.img partmap.txt	images\android
Debian (Jessie)	debian-jessie-images.tgz debian-jessie-images.tgz.hash.md5	boot.img rootfs.img partmap.txt	images\debian

• Specify OS

By default the SD card's configuration file "images\FriendlyARM.ini" specifies Android to be flashed to eMMC. If you want to install Debian please make the following change:

OS = Debian

"#" is a comment

• Flash Image to NanoPC-T2's eMMC

Please insert this card to your NanoPC-T2, connect the board to an HDMI or LCD, press and hold the boot key and power on (with a 5V/2A power source) to board to start installation. You can watch the whole installation process from the HDMI or LCD. If the following messages popped up it means the installation succeeds.

Android is fused successfully. 
All done.

After installation is done please do "reset" or power off and on the board to boot the board from eMMC.

You can check the LED's status to monitor the installation process too

LED Status	Installation Status
LED1 blinks twice continuously LED2 off	Power on normal. If installation doesn't go on LED1 will keep behaving this way and LED2 will be off
LED1 and LED2 blink alternatively with each blink for 0.3s	Installation going on
LED1 and LED2 blink alternatively with each blink for 1.2s	Installation succeeds
LED1 and LED2 blink simultaneously	Installation fails

4.2.3 Make Installation Card under Linux Desktop

• 1) Insert your SD card to your host running Ubuntu and check your SD card's device name

dmesg | tail

Search the messages output by "dmesg" for similar words like "sdc: sdc1 sdc2". If you can find them it means your SD card is recognized as "/dev/sdc". Or you can check that by commanding "cat /proc/partitions"

• 2) Downlaod Linux script

git clone https://github.com/friendlyarm/sd-fuse_nanopi2.git
cd sd-fuse_nanopi2

• 3) Make Android SD Card

su
./fusing.sh /dev/sdx

(Note: you need to replace "/dev/sdx" with the device name in your system)
When you run the script for the first time it will prompt you to download an image you have to hit “Y” within 10 seconds otherwise you will miss the download

• 4) Here is how to make a Debian SD card

./fusing.sh /dev/sdx debian

4.2.4 LCD/HDMI Resolution

When system boots our uboot will check whether it is connected to an LCD. If it recognizes an LCD it will configure its resolution. By default our uboot configures the display to HDMI 720P.
If you want to reset the LCD resolution you can modify file "arch/arm/plat-s5p4418/nanopi2/lcds.c" in the kernel and recompile it.
If your NanoPC-T2 connects an HDMI monitor and it runs Android it will automatically set the resolution to an appropriate HDMI mode by checking "EDID". If your NanoPC-T2 connects an HDMI monitor and it runs Debian by default it will set the resolution to HDMI 720P and in this case you can set it to 1080P by modifying your kernel's configuration.

4.3 Update Image Files in SD Card From PC Host

If you want to make some changes to the image files in your SD card please follow steps below otherwise you can skip this section.
Please insert your SD card to a PC host running LINUX, mount the boot and rootfs sections of the SD card and follow the steps below:
1) If you want to change your kernel command line parameters you can do it via the fw_setevn utility under "sd-fuse_nanopi2/tools".
Check the current Command Line:

cd sd-fuse_nanopi2/tools
./fw_printenv /dev/sdc | grep bootargs

Android 5.1.1_r6 starts SELinux. By default it is enforcing. You can change it this way:

./fw_setenv /dev/sdc bootargs XXX androidboot.selinux=permissive

This sets it to "permissive". The "XXX" stands for the original bootargs' value.

2) Update Kernel
Our customized uboot will check the LCD type when it boots.For a non-Android OS If it recognizes an LCD connected to the NanoPi 2 Fire it will load "uImage" from "boot" otherwise it will load "uImage.hdmi".
However for Android these two files don't make any differences for whatever display device it detects. You can use your generated uImage to replace the existing one under "boot".
For Debian if your generated kernel is for LCD you need to replace the existing uImage or if your kernel is for HDMI you need to replace the existing uImage.hdmi.

4.4 Run Android or Debian

• Insert an SD card with Android/Debian image file to your NanoPC-T2, connect the board to an HDMI monitor, press and hold the boot key, power on the board the NanoPC-T2 will be booted from the SD card. If you can see the red LED on and the green LED flashing it means your board is working and you will see Android/Debain loading on the HDMI monitor.
  

1）If you connect the NanoPC-T2 to an HDMI monitor you need to use a USB mouse and a USB keyboard to operate. If you connect it to an LCD with capacitive touch you can operate directly on the LCD.
2）If you want to do kernel development you'd better have a serial board which allows you to operate the board via a serial terminal.

• Here is a case in which we connect a NanoPC-T2 to a PC running Ubuntu and Minicom via a serial cable you will see system messages output to the PC’s minicom terminal:

• Under Debian the password for "root" is "fa"

4.5 Login Debian via VNC or SSH

If your NanoPC-T2 is not connected to a display device and your board runs the "-wifiap.img" image you can login your NanoPC-T2's nanopi2-wifiap(the default password is "123456789") via a mobile phone. You can download and install a "VNC Viewer" from here on mobile phone and login the NanoPC-T2 via VNC. Its default password is "fa123456". Here is a screenshot which shows how it looks like when users login the NanoPC-T2 from an iPhone via VNC:

You can login via "SSH -l root 192.168.8.1" too and the default password for "root" is "fa"

To make SSH login fluent we turn off WIFI by running the following command:

iwconfig wlan0 power off

5 Play with Debian

5.1 Ethernet Connection

• If the NanoPC-T2 is connected to a network via Ethernet before it is powered on it will automatically obtain an IP after it is powered on.

5.2 Wireless Connection

The following section only applies to the NanoPC-T2 which connects an HDMI or LCD

• When the board runs Debian after Debian is fully loaded please click on the network icon on the GUI it will automatically search for nearby WiFi sources. Select a source from the list, click on its "Properties", type its password, save, close and then "Connect".
  
  

The following section only applies to the NanoPC-T2 which doesn't connect any display device(runs "-wifiap.img")

By default the system's WIFI AP mode is on therefore it cannot search and connect to a wireless router. You need to turn off the WiFi AP mode by following the instructions below: First please set up the WIFI rounter you expect to connect to:
Log in the NanoPC-T2 via SSH. Check the WIFI device by running the following commands. Those starting with "wlan" are WiFi devices:

ifconfig -a

By default "wlan0" is the Wifi device. You need to create a configuration file with the same name under "/etc/network/interfaces.d/". For instance you can create a "wlan0" file:

vi /etc/network/interfaces.d/wlan0

Here is the wlan0's content:

auto wlan0
iface wlan0 inet dhcp
wpa-driver nl80211
wpa-ssid YourWiFiESSID
wpa-ap-scan 1
wpa-psk YourWiFiPassword

The "YourWiFiESSID" and "YourWiFiPassword" need to be replaced with your actual ESSID and password.

If your WiFi password has special characters or you don't want your password saved as plain text you can use "wpa_passphrase" to generate a psk for your WiFi password. Here is how you can do it:

wpa_passphrase YourWiFiESSID

Follow its prompt to type your password you will get some code in the following format. The string after "psk=" is your new password:

network={
        ssid="YourWiFiESSID"
        #psk="YourWiFiPassword"
        psk=1b66ca678d6f439f7360686ff5eeb7519cdc44b76a40d96515e4eb807a6d408b
}

Now you can replace the existing password in the wlan0 file with the new one:

auto wlan0
iface wlan0 inet dhcp
wpa-driver nl80211
wpa-ssid YourWiFiESSID
wpa-ap-scan 1
wpa-psk 1b66ca678d6f439f7360686ff5eeb7519cdc44b76a40d96515e4eb807a6d408b

Next turn off the AP mode. You need to do this as root. Please run the following commands and your system will be rebooted. After your system rebooted it will automatically connect to the WiFi router you set up in your first step:

su
turn-wifi-into-apmode no

5.3 Setup Wi-Fi AP

You can follow the steps below to setup Wi-Fi AP:

turn-wifi-into-apmode yes

Please reboot the system as prompted. By default the AP's name is "nanopi2-wifiap" and the password is 123456789.

Now you are able to find the "nanopi2-wifiap" from a PC host and connect to it. If a connection is a success you will be able to SSH to this NanoPC-T2 at "192.168.8.1":

ssh root@192.168.8.1

The password for it is "fa"

To make SSH login fluent and fast please turn off the WiFi's power saving mode by running the following command:

iwconfig wlan0 power off

You can check the WiFi mode via the following command:

cat /sys/module/bcmdhd/parameters/op_mode

If the result is "2" it means it is currently working as a WiFi AP.If you want to switch back to the Station mode you can do it this way:

turn-wifi-into-apmode no

5.4 Bluetooth

Click on the bluetooth icon on the GUI a menu will pop up:
Make discoverable enables the NanoPC-T2 to be searched for by other bluetooth devices;
Devices... opens a search window and searches for nearby bluetooth devices(Note: the "Make discoverable" property needs to be enabled on those nearby devices);
Send Files to Device...enables the NanoPi2 to send files to another bluetooth device which is a pair of the NanoPC-T2

5.5 安装Debian软件包

我们提供的是标准的Debian jessie系统，你可以使用apt-get等命令来安装软件包，如果板子是首次运行，需要先用以下命令更新软件包列表：

apt-get update

然后就可以安装软件包了，例如要安装ftp服务器，使用以下命令：

apt-get install vsftpd

如果软件包下载速度不理想，你可以编辑 /etc/apt/sources.list 更换一个更快的源服务器，这个网址[2]有一份完整的源镜像服务器列表，注意要选用一个带armhf架构的。

6 如何编译系统

6.1 安装交叉编译器

首先下载并解压编译器:

git clone https://github.com/friendlyarm/prebuilts.git
sudo mkdir -p /opt/FriendlyARM/toolchain
sudo tar xf prebuilts/gcc-x64/arm-cortexa9-linux-gnueabihf-4.9.3.tar.xz -C /opt/FriendlyARM/toolchain/

然后将编译器的路径加入到PATH中，用vi编辑vi ~/.bashrc，在末尾加入以下内容：

export PATH=/opt/FriendlyARM/toolchain/4.9.3/bin:$PATH
export GCC_COLORS=auto

执行一下~/.bashrc脚本让设置立即在当前shell窗口中生效，注意"."后面有个空格：

. ~/.bashrc

这个编译器是64位的，不能在32位的Linux系统上运行，安装完成后，你可以快速的验证是否安装成功：

arm-linux-gcc -v
Using built-in specs.
COLLECT_GCC=arm-linux-gcc
COLLECT_LTO_WRAPPER=/opt/FriendlyARM/toolchain/4.9.3/libexec/gcc/arm-cortexa9-linux-gnueabihf/4.9.3/lto-wrapper
Target: arm-cortexa9-linux-gnueabihf
Configured with: /work/toolchain/build/src/gcc-4.9.3/configure --build=x86_64-build_pc-linux-gnu
--host=x86_64-build_pc-linux-gnu --target=arm-cortexa9-linux-gnueabihf --prefix=/opt/FriendlyARM/toolchain/4.9.3
--with-sysroot=/opt/FriendlyARM/toolchain/4.9.3/arm-cortexa9-linux-gnueabihf/sys-root --enable-languages=c,c++
--with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3 --with-float=hard
...
Thread model: posix
gcc version 4.9.3 (ctng-1.21.0-229g-FA)

6.2 编译U-Boot

下载U-Boot源代码并编译，注意分支是nanopi2-lollipop-mr1:

git clone https://github.com/friendlyarm/uboot_nanopi2.git
cd uboot_nanopi2
git checkout nanopi2-lollipop-mr1
make s5p4418_nanopi2_config
make CROSS_COMPILE=arm-linux-

编译成功结束后您将获得u-boot.bin，您可以通过fastboot来更新正在运行的NanoPC-T2板上SD的U-Boot，方法如下：
1) 在电脑上先用命令 sudo apt-get install android-tools-fastboot 安装 fastboot 工具;
2) 用串口配件连接NanoPC-T2和电脑，在上电启动的2秒内，在串口终端上按下回车，进入 u-boot 的命令行模式；
3) 在u-boot 命令行模式下输入命令 fastboot 回车，进入 fastboot 模式；
4) 用microUSB线连接NanoPC-T2和电脑，在电脑上输入以下命令烧写u-boot.bin:

fastboot flash bootloader u-boot.bin

注意：您不能直接使用dd来更新SD卡，否则有可能会导致无法正常启动。

6.3 准备mkimage

编译内核需要用到U-Boot中的工具mkimage，因此，在编译内核uImage前，您需要保证您的主机环境可以成功运行它。
你可以直接使用命令 sudo apt-get install u-boot-tools 来安装，也可以自己编译并安装：

cd uboot_nanopi2
make CROSS_COMPILE=arm-linux- tools
sudo mkdir -p /usr/local/sbin && sudo cp -v tools/mkimage /usr/local/sbin

6.4 编译Linux kernel

6.4.1 编译内核

• 下载内核源代码

git clone https://github.com/friendlyarm/linux-3.4.y.git
cd linux-3.4.y
git checkout nanopi2-lollipop-mr1

NanoPC-T2内核所属的分支是nanopi2-lollipop-mr1，在开始编译前先切换分支。

• 编译Android内核

make nanopi2_android_defconfig
touch .scmversion
make uImage

• 编译Debian内核

make nanopi2_linux_defconfig
touch .scmversion
make uImage

编译成功结束后，新生成的内核烧写文件为 arch/arm/boot/uImage，此内核支持HDMI 720p输出，用于替换掉SD卡boot分区下的uImage.hdmi。
如果要支持HDMI 1080p，则需要修改内核配置：

touch .scmversion
make nanopi2_linux_defconfig
make menuconfig
  Device Drivers -->
    Graphics support -->
      Nexell Graphics -->
        [ ] LCD
        [*] HDMI
        (0)   Display In  [0=Display 0, 1=Display 1]
              Resolution (1920 * 1080p)  --->
make uImage

启用LCD，同时取消HDMI，然后退出并保存配置，编译后即可获得支持LCD显示的uImage，用于替换SD卡boot分区下的uImage。

6.4.2 编译内核模块

Android包含内核模块，位于system分区的 /lib/modules/ 下，如果您有新的内核模块或者内核配置有变化，则需要重新编译。
首先编译内核源代码中的模块：

cd linux-3.4.y
make CROSS_COMPILE=arm-linux- modules

另外有2个内核模块的源代码位于Android源代码中，可使用以下命令来编译：

cd /opt/FriendlyARM/s5p4418/android
./vendor/friendly-arm/build/common/build-modules.sh

其中 “/opt/FriendlyARM/s5p4418/android” 是指Android源代码的TOP目录，使用参数“-h”可查看帮助。
编译成功结束后，会显示生成的内核模块。

6.5 编译Android

• 搭建编译环境

搭建编译Android的环境建议使用64位的Ubuntu 14.04，安装需要的包即可。

sudo apt-get install bison g++-multilib git gperf libxml2-utils make python-networkx zip
sudo apt-get install flex libncurses5-dev zlib1g-dev gawk minicom

更多说明可查看 https://source.android.com/source/initializing.html 。

• 下载源代码

Android源代码的下载需要使用repo，其安装和使用请查看 https://source.android.com/source/downloading.html 。

mkdir android && cd android
repo init -u https://github.com/friendlyarm/android_manifest.git -b nanopi2-lollipop-mr1
repo sync

其中“android”是指工作目录。

• 编译系统

source build/envsetup.sh
lunch aosp_nanopi2-userdebug
make -j8

编译成功完成后，目录 out/target/product/nanopi2/ 下包含可用于烧写的image文件。

7 扩展连接

7.1 NanoPi 2连接USB(FA-CAM202)200万摄像头模块

• NanoPi 2使用Debian系统，假设你已接好LCD屏或者HDMI，进入系统后，点击左下角的菜单键“Other”-->xawtv9，打开USB Camera软件。进入“welcome to xawtv！”，选择OK即可进行拍照。

7.2 NanoPC-T2连接CMOS 500万摄像头模块

• NanoPi 2使用Android5.1系统，假设你已经接好LCD屏或者HDMI，进入系统后，直接点击“camera”图标，即可打开摄像头进行拍照。

7.3 NanoPi 2接USB摄像头使用OpenCV

• OpenCV的全称是Open Source Computer Vision Library，是一个跨平台的计算机视觉库。
• NanoPi 2跑Debian系统时，接USB Camera，可直接使用官方的OpenCV。
  

1、以下介绍的是NanoPi 2用C++使用的OpenCV：

• 首先需要保证你的NanoPi 2能连外网，假如你有串口，直接串口登陆超级终端（或者ssh登陆）。进入系统后，输入用户名（root），密码（fa）登陆；
• 以下命令在超级终端执行：

apt-get update
apt-get install libcv-dev libopencv-dev

2、NanoPi 2烧写Debian系统启动后，接上USB Camera，使用Debian系统自带的摄像头软件测试，确定摄像头能正常使用。
3、通过终端执行命令，查看你的摄像头设备：

ls /dev/video*

• 注：video9 是你的USB摄像头设备（注：video0到8均被其它设备占用了）

4、opencv的测试代码（官方C++示例代码）在 /home/fa/Documents/opencv-demo, 使用以下命令即可编译：

cd /home/fa/Documents/opencv-demo
make

编译成功后，得到可执行文件demo

5、这里特别说明：目前NanoPi 2的内核注册了9个video设备，而opencv的官方源码定义了最多只能使用8个Camera，所以这里需要删掉一个暂时没用到的video，我们把video0设备删掉：

rm /dev/video0
mv /dev/video9 /dev/video0

6、以下步骤需要在NanoPi 2上接上键盘执行：

./demo

你便可以看到opencv已经用起来，如图：

8 NanoPC-T2 扩展TF卡分区

8.1 NanoPC-T2 Debian系统扩展TF卡分区

• Debian扩展分区，要在pc上执行下列操作：

sudo umount /dev/sdx?
sudo parted /dev/sdx unit % resizepart 2 100 unit MB print
sudo resize2fs -f /dev/sdx2

• Android扩展分区，要在pc上执行下列操作：

sudo umount /dev/sdx?
sudo parted /dev/sdx unit % resizepart 4 100 resizepart 7 100 unit MB print
sudo resize2fs -f /dev/sdx7

(注：/dev/sdx请替换为实际的SD卡设备文件名)

9 源代码和固件下载链接

• 烧写固件下载链接：[3]
• 源代码下载链接：[4]

10 资源链接

• SEC_Users_Manual_S5P4418_Users_Manual_Preliminary[5]
• 原理图(NanoPC-T2_1601B_Schematic.pdf)