申請 Google Map Api Key

搜尋 keytool 

Android Studio Import jar Files 載入 jar 檔案

請用ctrl+c ctrl+v複製

Copy LeapJava.jar file into Project → app → libs

Result

Android Studio Import .so File 載入 so 檔案

Android → Project

main → Right click → New → Directory

Windows powershell 安裝或更新

Windows PowerShell 4.0 is part of the Windows Management Framework 4.0, which includes the following:

• Windows PowerShell
• Windows PowerShell Integrated Scripting Environment (ISE)
• Windows PowerShell Web Services (Management OData IIS Extension)
• Windows Remote Management (WinRM)
• Windows Management Infrastructure (WMI)
• Server Manager WMI provider
• Windows PowerShell Desired State Configuration (DSC)

windows 7 要安裝要求Windows PowerShell 4.0 需要windows 7SP1 up和 .NET 4.5

Reference:http://social.technet.microsoft.com/wiki/contents/articles/21016.how-to-install-windows-powershell-4-0.aspx

使用 Android Debug Bridge (ADB) 環境變數建立

假定你已經確安裝完 Android Studio


到Users底下你的使用者名稱資料夾內

使用 EmguCV GPU CUDA Image< > 發生 System.TypeInitializationException 例外

用 EmguCV Image< > 發生 System.TypeInitializationException 可能是沒有加入opencv dll檔案

安裝 Google Nexus USB Driver

http://developer.android.com/intl/zh-tw/sdk/win-usb.html#top

Visual Studio C# 安裝 OpenCV

Software & Library Vision
- Visual Studio:2013 C#
- OpenCV:2.4.10

目的:在 Visual Studio 2013 使用 OpenCV ，這邊我使用 EmguCV，他已經幫你把 OpenCV 函式庫包進去，讓你可以在 .NET framework下呼叫 OpenCV 函式。

Step 1. 確認已裝好你的 Visual Studio 2013

Step 2. 下載 EmguCV並安裝

請確認你所要使用的OpenCV版本，並下載正確版本。
→載點←

下載完後安裝，這邊就省略安裝過程。

Interface Design Practice 1 2015/09/30

由PC host端觀看target board開機資訊，並操作基本uboot command

PC host端：

OS:Linux Debian

安裝minicom 終端模擬程式

在terminal下達底下command

請參考此篇→文章的Use Serial Port To Remote Control

這邊我的target bound rate為9600，format為8N1

安裝與設定完成則下達

# minicom -w

再把target board reset

離開minicom請按Ctrl-A再按q選擇yes

Raspberry Pi 2 Energy Analysis

事前準備

1. 一台Linux OS x86或x86-64 主機（有3GB以上硬碟空間，RAM>2GB）
2. 一塊SBC(UDOO, Raspberry Pi 2)
3. USB 延長線公對母
4. ARM Energy Probe

下載DS-5 Streamline

http://ds.arm.com/downloads/

# mkdir /usr/local/DS500-Strealine

# cd /home/clementyan/下載/

# mv DS500-BN-00019-r5p0-21rel1.tgz /usr/local/DS500-Strealine

# cd /usr/local/DS500-Strealine

# tar xfva DS500-BN-00019-r5p0-21rel1.tgz

Disabling shutdown command for users 禁止一般使用者關機 linux kde

最近玩server發現一件嚴重的事情！！

一般使用者竟然可以執行
$ /sbin/shutdown -h now

Solution:
# ls -l /sbin/shutdown
lrwxrwxrwx 1 root root 14 May 26 14:07 /sbin/shutdown -> /bin/systemctl
# ls -l /bin/systemctl
-rwxrwxrwx 1 root root 538904 May 26 14:07 /bin/systemctl
# chmod 755 /sbin/shutdown
# ls -l /bin/systemctl
-rwxr-xr-x 1 root root 538904 May 26 14:07 /bin/systemctl

# vi /etc/kde4/kdm/kdmrc
搜尋所有AllowShutdown=ALL
改成AllowShutdown=Root

test 7

/*
  ReadAnalogVoltage
  Reads an analog input on pin 0, converts it to voltage, and prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

 This example code is in the public domain.
 */

const int ledPin =  13;      // the number of the LED pin

// Variables will change:
int ledState = LOW;             // ledState used to set the LED
long previousMillis = 0,abcMillis=0;        // will store last time LED was updated
unsigned long button=0;
int buttonflag=1;
int count=0,longflag=0;

Arduino practice 3

const int numReadings = 10;

int readings[numReadings];      // the readings from the analog input
int index = 0;                  // the index of the current reading
int total = 0;                  // the running total
int average = 0;                // the average
int brightness = 0;
int fadeAmount = 5;
int delayDuration = 30;
int flag=0;

Debian Jessie SSL VPN Client

目的：在學校網域以外的地方連老師的鏡像站
不知從何時開始學校外沒辦法連到老師的鏡像站
# ping 120.117.72.71

建立網路印表機伺服器 安裝網路印表機 智慧型手機列印 linux printer share windows linux smartphone tablet

測試環境在Linux上建網路印表機伺服器，讓電腦、手機與平板都可列印

Server
硬體架構：x86_64
O.S.:Linux Debian Jessie
印表機：Epson stylns TX235(USB port)

印表機的選擇

印表機廠牌有Epson、Hp等，每家廠牌又有各種型號，我們所要選擇廠牌與型號，當然是要能支援Linux，我們從Linux 基金會的 Open Printing來搜尋哪些印表機支援Linux，網址如下：
Open Printing 資料庫：http://www.openprinting.org/printers

Linux cpu temperature

# apt-get install lm-sensors
# sensors-detect
# sensors-detect revision 6209 (2014-01-14 22:51:58 +0100)
# Board: ASRock Z77 Extreme4

Doom on Linux Debian

# apt-get install prboom

Downloads Doom.wad
http://www.pc-freak.net/blog/doom-1-doom-2-doom-3-game-wad-files-for-download-playing-doom-on-debian-linux-via-freedoom-open-source-doom-engine/

Debian Jessie Cross Toolchains Install

安裝Cross-compiler分三個套件

armhf(ArmHardFloatPort)
Supported device:supports newer, more powerful 32-bit devices using ARMv7
armel(ArmEabiPort)
Supported device:port targets a range of older 32-bit devices using ARMv4, particularly those used in NAS hardware and a variety of *plug computers.
arm64(Arm64Port)
Supported device:latest 64-bit ARM-powered devices.
# dpkg --add-architecture armel
# apt-get update
# apt-get install crossbuild-essential-armel
紅色字可以替代armel armhf arm64 

# vi /etc/apt/sources.list.d/crosstools.list
deb http://emdebian.org/tools/debian/ jessie main
# cd /tmp
# wget http://emdebian.org/tools/debian/emdebian-toolchain-archive.key
# apt-get install curl
# curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | apt-key add -
# apt-get update

install arm-linux-gnueabi- armel toolchain
# dpkg --add-architecture armel
# apt-get update
# apt-get install crossbuild-essential-armel
# arm-linux-gnueabi-
arm-linux-gnueabi-addr2line       arm-linux-gnueabi-gcc-nm
arm-linux-gnueabi-ar              arm-linux-gnueabi-gcc-nm-4.9
arm-linux-gnueabi-as              arm-linux-gnueabi-gcc-ranlib
arm-linux-gnueabi-c++             arm-linux-gnueabi-gcc-ranlib-4.9
arm-linux-gnueabi-c89             arm-linux-gnueabi-gcov-4.9
arm-linux-gnueabi-c99             arm-linux-gnueabi-gprof
arm-linux-gnueabi-cc              arm-linux-gnueabi-ld
arm-linux-gnueabi-c++filt         arm-linux-gnueabi-ld.bfd
arm-linux-gnueabi-cpp-4.9         arm-linux-gnueabi-ld.gold
arm-linux-gnueabi-dwp             arm-linux-gnueabi-nm
arm-linux-gnueabi-elfedit         arm-linux-gnueabi-objcopy
arm-linux-gnueabi-g++             arm-linux-gnueabi-objdump
arm-linux-gnueabi-g++-4.9         arm-linux-gnueabi-ranlib
arm-linux-gnueabi-gcc             arm-linux-gnueabi-readelf
arm-linux-gnueabi-gcc-4.9         arm-linux-gnueabi-size
arm-linux-gnueabi-gcc-ar          arm-linux-gnueabi-strings
arm-linux-gnueabi-gcc-ar-4.9      arm-linux-gnueabi-strip

if you whant to install armhf architecture
# dpkg --add-architecture armhf
# apt-get update
# apt-get install crossbuild-essential-armhf

Reference:https://wiki.debian.org/CrossToolchains

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