Difference between revisions of "Matrix - Joystick"

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Line 19: Line 19:
 
|GND    || Ground
 
|GND    || Ground
 
|-
 
|-
−
|5V    || Power 5V
+
|5V    || Supply Voltage 5V
 
|-
 
|-
 
|SW    || Button
 
|SW    || Button
Line 30: Line 30:
 
==Basic Device Operation==
 
==Basic Device Operation==
 
* It has two analog outputs and one digital output. The two analog outputs are measured as X and Y values as the calibrated resistance of the two potentiometers. The digital output is measured as Z value indicating whether or not the button is pressed. <br>
 
* It has two analog outputs and one digital output. The two analog outputs are measured as X and Y values as the calibrated resistance of the two potentiometers. The digital output is measured as Z value indicating whether or not the button is pressed. <br>
−
* 为了更加方便地配合扩展板等标准接口，在设计上把 X,Y,Z 轴的电路都单独引出，以控制输入这个操纵杆模块的 x、y、z 的值以及在特定的值下实现某种功能。We extend all three outputs: X, Y and Z.
+
* We extend all three outputs: X, Y and Z and users can use them easily.
  
 +
 +
==Applications==
 +
The Matrix-Joystick module outputs analog signals which can be converted to digital signals with an ADC converter e.g. the Matrix-Analog_to_Digital_Converter.<br>
 +
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki: [[Matrix_-_Analog_to_Digital_Converter]].<br>
 +
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix_Joystick_nanopi_m1.jpg|frameless|600px|Matrix_Joystick_nanopi_m1]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||   
 +
|-
 +
|GND    || NanoPi M1 Pin9
 +
|-
 +
|5V    || NanoPi M1 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:Matrix-Joystick_nanopi_2.jpg|frameless|600px|Matrix-Joystick_nanopi_2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi 2 Pin9
 +
|-
 +
|5V    || NanoPi 2 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Connect to NanoPi M2 / NanoPi 2 Fire===
 +
Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:<br>
 +
[[File:Matrix_Joystick_nanopi_m2.jpg|frameless|600px|Matrix_Joystick_nanopi_m2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi M2 Pin9
 +
|-
 +
|5V    || NanoPi M2 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix_Joystick_NanoPC-T2.jpg|frameless|600px|Matrix_Joystick_NanoPC-T2]]
 +
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPC-T2 USB Host GND
 +
|-
 +
|5V    || NanoPC-T2 USB Host 5V
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 +
==Compile & Run Test Program==
 +
Boot your ARM board with Debian and copy the matrix code:
 +
<syntaxhighlight lang="bash">
 +
$ apt-get update && apt-get install git
 +
$ git clone https://github.com/friendlyarm/matrix.git
 +
</syntaxhighlight>
 +
If your cloning is done successfully a "matrix" directory will be generated.
 +
 +
Compile and install Matrix:
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ make && make install
 +
</syntaxhighlight>
 +
 +
Run test program:
 +
<syntaxhighlight lang="bash">
 +
$ matrix-joystick
 +
</syntaxhighlight>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.<br>
 +
Here is what you should observe:<br>
 +
<syntaxhighlight lang="bash">
 +
x=1280 y=1280
 +
</syntaxhighlight>
 +
When you move the stick you will see X and Y's value changes.
 +
 +
==Code Sample==
 +
This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-joystick". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i = 0;
 +
    int x, y, board;
 +
   
 +
    x = y = 0;
 +
    if ((board = boardInit()) < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
   
 +
    system("modprobe "DRIVER_MODULE);
 +
    signal(SIGINT, intHandler);
 +
    for (i=0; i<PS2_READ_TIMES; i++) {
 +
        if (pcf8591Read(1, &x) != -1 && pcf8591Read(2, &y) != -1) {
 +
            printf("x=%4d y=%4d\n", x, y);
 +
        }
 +
    }
 +
    system("rmmod "DRIVER_MODULE);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
For more details about this APIs called in this code sample refer to [[Matrix API reference manual]] <br>
 +
<!---
 
==Download Matrix Source Code==
 
==Download Matrix Source Code==
−
All the matrix modules' code samples are open source. They are maintained on GitHub - git://github.com/friendlyarm/matrix.git <br>
+
All the matrix modules' code samples are open source. They are maintained on GitHub - https://github.com/friendlyarm/matrix.git <br>
 
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.<br>
 
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.<br>
 
* The nanopi branch contains the matrix modules' code samples for the NanoPi
 
* The nanopi branch contains the matrix modules' code samples for the NanoPi
 +
* The nanopi 2 branch contains the matrix modules' code samples for the NanoPi 2
 
* The tiny4412 branch contains the matrix modules' code samples for the Tiny4412
 
* The tiny4412 branch contains the matrix modules' code samples for the Tiny4412
 
* The raspberrypi branch contains the matrix modules' code samples for the RaspberryPi
 
* The raspberrypi branch contains the matrix modules' code samples for the RaspberryPi
Line 47: Line 177:
 
Clone the matrix code from GitHub
 
Clone the matrix code from GitHub
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
−
$ git clone git://github.com/friendlyarm/matrix.git
+
$ git clone https://github.com/friendlyarm/matrix.git
 
</syntaxhighlight>
 
</syntaxhighlight>
 
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.
 
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.
  
−
==与NanoPi连接使用==
+
==Connect to NanoPi 2==
−
===准备工作===
+
===Hardware Connection===
−
在NanoPi上运行Debian系统，然后在主机PC上安装并使用相应的编译器。参考wiki：[[NanoPi/zh|NanoPi]] <br>
+
Please refer to the following connection diagram to connect the Matrix-Joystick to the NanoPi 2:<br>
−
注意：必须使用nanopi-v4.1.y-matrix分支编译出来的内核。<br>
+
[[File:Matrix-Joystick_nanopi_2.jpg|frameless|600px|Matrix-Joystick_nanopi_2]]
−
下载NanoPi内核源代码并编译
+
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Joystick ||       
 +
|-
 +
|GND    || NanoPi 2 Pin14
 +
|-
 +
|5V    || NanoPi 2 Pin2
 +
|-
 +
|X      || Matrix-Analog_to_Digital_Converter A1
 +
|-
 +
|Y      || Matrix-Analog_to_Digital_Converter A2
 +
|}
 +
 
 +
===Compile Test Program===
 +
Please login the matrix hub and enter the nanopi2 branch
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ git checkout nanopi2
 +
</syntaxhighlight>
 +
 
 +
Compile the matrix code
 +
<syntaxhighlight lang="bash">
 +
$ make CROSS_COMPILE=arm-linux- clean
 +
$ make CROSS_COMPILE=arm-linux-
 +
$ make CROSS_COMPILE=arm-linux- install
 +
</syntaxhighlight>
 +
Note: please make sure to install the cross compiler "arm-linux-gcc-4.9.3" on your PC, which is used to compile files for the NanoPi 2.<br>
 +
Generated library files are under the "install/lib" directory. The test program is under the "install/usr/bin" directory.<br>
 +
The modules are under the "modules" directory. The driver's source code is in github: https://github.com/friendlyarm/linux-3.4.y.git <br>
 +
 
 +
===Run Test Program===
 +
Please insert a TF card which is flashed with Debian to a Linux host and mount its boot and rootfs sections.<br>
 +
We assume the rootfs is mounted to /media/rootfs then please run the following commands to copy the module, library and test program to the card.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cp modules /media/rootfs/ -r
 +
$ cp install/lib/* /media/rootfs/lib/ -d
 +
$ cp install/usr/bin/* /media/rootfs/usr/bin/
 +
</syntaxhighlight>
 +
 
 +
Insert this TF card to your NanoPi 2, power on and run the following commands to load the driver.<br>
 +
<syntaxhighlight lang="bash">
 +
$ cd /modules
 +
$ insmod pcf8591.ko
 +
</syntaxhighlight>
 +
 
 +
Start the matrix-joystick program.<br>
 +
<syntaxhighlight lang="bash">
 +
$ matrix-joystick
 +
</syntaxhighlight>
 +
Here is what you expect to observe:<br>
 +
[[File:matrix-joystick_result.png|frameless||matrix-joystick_result]] <br>
 +
 
 +
===Code Sample===
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i = 0;
 +
    int x, y;
 +
 
 +
    x = y = 0;
 +
    for (i=0; i<PS2_READ_TIMES; i++) {
 +
        if (pcf8591Read(1, &x) != -1 && pcf8591Read(2, &y) != -1) {
 +
            printf("x=%4d y=%4d\n", x, y);
 +
        }
 +
    }
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
 
 +
 
 +
==Connect to NanoPi==
 +
===Preparations===
 +
Please install a Debian on a NanoPi and an appropriate cross compiler on a PC. Please refer to wiki: [[NanoPi/zh|NanoPi]] <br>
 +
Compile a NanoPi kernel. Note: please use the kernel's source code from the nanopi-v4.1.y-matrix branch.<br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ git clone https://github.com/friendlyarm/linux-4.x.y.git
 
$ git clone https://github.com/friendlyarm/linux-4.x.y.git
Line 65: Line 270:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===硬件连接===
+
===Hardware Connection===
−
参考下图连接模块Matrix-Joystick、模块Matrix-Analog_to_Digital_Converter和NanoPi <br>
+
Please refer to the following connection diagram to connect the Matrix-Joystick and Matrix-Analog_to_Digital_Converter to the NanoPi <br>
 
[[File:matrix-joystick_nanopi.jpg|frameless|600px|matrix-joystick_nanopi]]
 
[[File:matrix-joystick_nanopi.jpg|frameless|600px|matrix-joystick_nanopi]]
  
−
连接说明：
+
Connection Details:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
Line 85: Line 290:
 
|}
 
|}
  
−
===编译测试程序===
+
===Compile Test Program===
−
进入matrix代码仓库，切换到nanopi分支
+
Please login the matrix hub and enter the nanopi branch
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix
 
$ cd matrix
Line 92: Line 297:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
编译Matrix配件代码
+
Compile the matrix code
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ make CROSS_COMPILE=arm-linux- clean
 
$ make CROSS_COMPILE=arm-linux- clean
Line 98: Line 303:
 
$ make CROSS_COMPILE=arm-linux- install
 
$ make CROSS_COMPILE=arm-linux- install
 
</syntaxhighlight>
 
</syntaxhighlight>
−
注意：请确保你的主机PC当前使用的交叉编译器为NanoPi-Debian配套的arm-linux-gcc-4.4.3。<br>
+
Note: please make sure to install the cross compiler "arm-linux-gcc-4.4.3" on your PC, which is used to compile files for the NanoPi-Debian.<br>
−
编译出来的库文件位于install/lib目录下，而测试程序则位于install/usr/bin目录下，模块Matrix-Joystick对应的测试程序为matrix-joystick。<br>
+
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Joystick" module is "matrix-joystick".<br>
  
−
===运行测试程序===
+
===Run Test Program===
−
拷贝库文件和测试程序到NanoPi的文件系统上
+
Please copy the library files and test program to the NanoPi
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
 
$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
Line 108: Line 313:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
然后启动NanoPi，在Debian的shell终端中执行如下命令运行模块Matrix-Joystick的测试程序 <br>
+
Power on the NanoPi and run the following command in Debian's terminal <br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ matrix-joystick
 
$ matrix-joystick
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
int main(int argc, char ** argv)
 
int main(int argc, char ** argv)
Line 149: Line 354:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
==与Tiny4412连接使用==
+
==Connect to Tiny4412==
−
===准备工作===
+
===Preparations===
−
参考Tiny4412光盘里的《友善之臂Ubuntu使用手册》，在Tiny4412上运行UbuntuCore系统，然后在主机PC上安装并使用相应的编译器。<br>
+
Please refer to the Tiny4412's user's manual to install a UbuntuCore on the Tiny4412 and install an appropriate cross compiler on a PC.<br>
−
注意：只能使用Tiny4412SDK-1506的底板。
+
Note: only the Tiny4412SDK-1506 carrier board can work with this module.
  
−
===硬件连接===
+
===Hardware Connection===
−
参考下图连接模块Matrix-Joystick、模块Matrix-Analog_to_Digital_Converter和Tiny4412 <br>
+
Please refer to the following diagram to connect the Matrix-Joystick and Matrix-Analog_to_Digital_Converter to the Tiny4412  <br>
 
[[File:matrix-joystick_tiny4412.jpg|frameless|600px|matrix-joystick_tiny4412]]
 
[[File:matrix-joystick_tiny4412.jpg|frameless|600px|matrix-joystick_tiny4412]]
  
−
连接说明：
+
Connection Details:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
Line 174: Line 379:
 
|}
 
|}
  
−
===编译测试程序===
+
===Compile Test Program===
−
进入matrix代码仓库，切换到tiny4412分支
+
Please login the Matrix hub and enter the matrix-tiny4412 branch
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix
 
$ cd matrix
Line 181: Line 386:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
编译Matrix配件代码
+
Compile the matrix code
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
Line 187: Line 392:
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- install
 
$ make CROSS_COMPILE=arm-linux-gnueabihf- install
 
</syntaxhighlight>
 
</syntaxhighlight>
−
注意：请确保你的主机PC当前使用的交叉编译器为Tiny4412-UbuntuCore配套的arm-linux-gnueabihf-gcc-4.7.3。<br>
+
Note: please make sure to install the cross compiler "arm-linux-gnueabihf-gcc-4.7.3" on your PC, which is used to compile files for the Tiny4412-UbuntuCore.<br>
−
编译出来的库文件位于install/lib目录下，而测试程序则位于install/usr/bin目录下，模块Matrix-Joystick对应的测试程序为matrix-joystick。
+
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Joystick" module is "matrix-joystick".
  
−
===运行测试程序===
+
===Run Test Program===
−
拷贝库文件和测试程序到Tiny4412的UbuntuCore的文件系统上
+
Please copy the library files and test program to the Tiny4412
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
 
$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
Line 197: Line 402:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
然后启动Tiny4412，在UbuntuCore的shell终端中执行如下命令运行模块Matrix-Joystick的测试程序
+
Power on the Tiny4412 and run the following command in UbuntuCore's terminal
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ matrix-joystick
 
$ matrix-joystick
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
int main(int argc, char ** argv)
 
int main(int argc, char ** argv)
Line 238: Line 443:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
==与RaspberryPi连接使用==
+
==Connect to RaspberryPi==
−
 
+
−
==与Arduino连接使用==
+
  
−
==相关资料==
+
==Connect to Arduino==
 +
--->
  
 +
==Resources==
  
 +
==Update Log==
 +
===Feb-23-2016===
 +
* Added the description for "NanoPi 2 branch" in Section 4
 +
* Added Section 5: Connect to NanoPi 2
 +
===June-21-2016===
 +
* Re-organized and simplified wiki
 
<!--
 
<!--
 
==Introduction==
 
==Introduction==

Latest revision as of 14:03, 21 June 2016

查看中文

1 Introduction

Joystick
  • The matrix-joystick module is a two-axis stick module. It consists of two Sliding rheostats and one button. It has two analog outputs and one digital output. Its positional states can be measured as X and Y axis values as the calibrated resistance of the two potentiometers.
  • When you move the joystick the sliding rheostats' resistance will change and the corresponding x/y values will change too. When you push the joystick the SW level will turn low.

2 Features

  • X and Y axis, and one button
  • 2.54mm spacing pin
  • PCB dimension(mm): 24 X 32

双轴摇杆PCB

  • Pin Description:
Pin Description
GND Ground
5V Supply Voltage 5V
SW Button
X X Axis
Y Y Axis

3 Basic Device Operation

  • It has two analog outputs and one digital output. The two analog outputs are measured as X and Y values as the calibrated resistance of the two potentiometers. The digital output is measured as Z value indicating whether or not the button is pressed.
  • We extend all three outputs: X, Y and Z and users can use them easily.


4 Applications

The Matrix-Joystick module outputs analog signals which can be converted to digital signals with an ADC converter e.g. the Matrix-Analog_to_Digital_Converter.
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki: Matrix_-_Analog_to_Digital_Converter.

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix_Joystick_nanopi_m1

Connection Details:

Matrix-Joystick
GND NanoPi M1 Pin9
5V NanoPi M1 Pin2
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Joystick_nanopi_2

Connection Details:

Matrix-Joystick
GND NanoPi 2 Pin9
5V NanoPi 2 Pin2
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

4.3 Connect to NanoPi M2 / NanoPi 2 Fire

Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:
Matrix_Joystick_nanopi_m2

Connection Details:

Matrix-Joystick
GND NanoPi M2 Pin9
5V NanoPi M2 Pin2
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix_Joystick_NanoPC-T2

Connection Details:

Matrix-Joystick
GND NanoPC-T2 USB Host GND
5V NanoPC-T2 USB Host 5V
X Matrix-Analog_to_Digital_Converter A1
Y Matrix-Analog_to_Digital_Converter A2

5 Compile & Run Test Program

Boot your ARM board with Debian and copy the matrix code: 

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

If your cloning is done successfully a "matrix" directory will be generated.

Compile and install Matrix: 

$ cd matrix
$ make && make install

Run test program: 

$ matrix-joystick

Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.
Here is what you should observe:

x=1280 y=1280

When you move the stick you will see X and Y's value changes.

6 Code Sample

This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-joystick". Here is its source code: 

int main(int argc, char ** argv)
{
    int i = 0;
    int x, y, board;
 
    x = y = 0;
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    for (i=0; i<PS2_READ_TIMES; i++) {
        if (pcf8591Read(1, &x) != -1 && pcf8591Read(2, &y) != -1) {
            printf("x=%4d y=%4d\n", x, y);
        }
    }
    system("rmmod "DRIVER_MODULE);
    return 0;
}

For more details about this APIs called in this code sample refer to Matrix API reference manual

7 Resources

8 Update Log

8.1 Feb-23-2016

  • Added the description for "NanoPi 2 branch" in Section 4
  • Added Section 5: Connect to NanoPi 2

8.2 June-21-2016

  • Re-organized and simplified wiki
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