close timer of kernel

 

if (timer_pending(&handshking_timer))
{
    del_timer_sync(&handshking_timer);
    //init_timer(&handshking_timer);
}

create and cloase of kernel thread

Referece

http://stackoverflow.com/questions/5280693/kernel-thread-implementation

Linux I2C Driver

 

linux-source/Documentation/i2c/ has lot of the information you'd need. .../writing-clients.txt is a good place to start.

Have a look at the online version:

https://www.kernel.org/doc/Documentation/i2c/writing-clients

There is an okay sort of a tutorial at:

http://renjucnair.blogspot.ca/2012/01/writing-i2c-client-driver.html

Here is a good commentary on someone writing an i2c driver and has a tutorial feel to it:

http://www.embedded-bits.co.uk/2009/i2c-in-the-2632-linux-kernel/

Here is some sample code:

http://code.google.com/p/ldd-templates/source/browse/drivers/i2c/sample-i2c-client.c

Reference

http://stackoverflow.com/questions/16728587/i2c-driver-in-linux

linux command – grep

 

 

dmesg | grep -i usb

[option]

“-i” ignore the case.

cat /var/log/dmesg | less

 

 

Reference

http://manpages.ubuntu.com/manpages/utopic/man1/dmesg.1.html

samba

 

smbpasswd

-a add new accout

-U change password

Reference

[1] https://www.samba.org/samba/docs/man/manpages/smbpasswd.8.html

problem of apt-get install

E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

rm /var/lib/dpkg/lock rm /var/cache/apt/archives/lock sudo dpkg --configure -a

Reference
http://www.linuxquestions.org/questions/linux-newbie-8/e-could-not-get-lock-var-lib-dpkg-lock-open-11-resource-temporarily-unavailable-360554/

Apache in linux Ubuntu(2)

403 Forbidden
<Directory />
    Options FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
</Directory>


權限問題
drwx------

chmod 707

Reference 

http://ubuntuforums.org/archive/index.php/t-763605.html

http://linux.vbird.org/linux_basic/0210filepermission.php

http://klaus580925.pixnet.net/blog/post/28185261-%5B伺服器的背叛%5D---解決-apache-的-403-forbidden-問

Apache in linux Ubuntu(1)

root@chihhang-desktop:/etc# ./init.d/apache2 restart

Error message 

* Restarting web server apache2

apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

 ... waiting apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

   ...done.

Solve

   vi /etc/apache2/httpd.conf

ServerName localhost

http://plus-now.com/?p=4

Successful message

 * Restarting web server apache2

 ... waiting    ...done.

vi in Linux

Ｗ. 上下右左會出現ABCD in the insert mode

vi ~/.vimrcset nocompatible

Q. It doesn't work with MacVim (and GUI Vim). I'm only able to delete text from the line I'm in. If I switch to normal mode or if I move the cursor to another line I'm not able to delete text with backspace anymore and I have to delete it with 'x' in normal mode. 

set backspace+=indent,eol,start set backspace=2 

Q. color for c language

:syntax on 

Q. disconnection

ServerAliveInterval 60 sec

u	復原前一個動作。(常用)
[Ctrl]+r	重做上一個動作。(常用)

Q. Page down, Page up.

Then CTRL-B and CTRL-F should do the trick.

referance

http://www.yolinux.com/TUTORIALS/LinuxTutorialAdvanced_vi.html (Home of vim)

http://vim.1045645.n5.nabble.com/MacVim-and-backspace-td1216153.html

http://doc.linuxpk.com/80773.html 

http://homepage.ttu.edu.tw/u9106240/page_main/vim_menu.html
http://greenisland.csie.nctu.edu.tw/wp/2005/09/10/329/

Command in Linux - find

初步概念

最近一直在做一些資料整理，但總覺得一個一個搬檔案殺檔案，真的是件很瑣碎的事情，於是就想了一些辦法能夠減少這樣的次數。

Work Env.

find \. -name "*.png" -exec ./$1 {} {}.z \;

Piggy Note

我想發明電腦就是要為了能夠幫助人處理一些瑣碎的事情

vimdiff

初步概念

在Team work的作業環境下，該如何將別人的程式有效的結合自己的程式，當然你可以一份一份的將程式碼看過一遍，在區分找出不同之處加以修改，不過這樣的過程非常耗時且毫無效率可言，於是就有人想出該如何利用其他工具來達到目的，vimdiff就是用來分辨兩者的程式碼有何不同且能修改程式。

Work Env.

#apt-get install vim-full

do - Get changes from other window into the current window.

dp - Put the changes from current window into the other window.

]c - Jump to the next change. 

[c - Jump to the previous change. 

Ctrl W + Ctrl W - Switch to the other split window. 

:diffupdate - diff update  

:syntax off - syntax off  

zo - open folded text 

zc - close folded text

Piggy Note

在Windows裡用了許多好用的軟體作為寫程式的輔助，但在Linux中的概念總覺得不太方便界面不人性化，不過在vimdiff中打破這項觀念，這套軟體真的可以跟beyond compare作抗衡。

Referance

http://www.debianadmin.com/vimdiff-edit-two-or-three-versions-of-a-file-with-vim-and-show-differences.html

http://amjith.blogspot.com/2008/08/quick-and-dirty-vimdiff-tutorial.html

序論-業界視野

小時候常常從長輩們嘴裡探討說

社會就像是一個大染缸，白的進去也會黑的出來。

小時候總是不明白其中的道理，等到長大了出社會了，經過沈澱後才發現固中的道理所在。其實環境很容易改變一個人，但一個人卻很難改變這個世界。當我們長大了有了自己思考的方式和做事行為，在這過程我們能學習成長的就是周遭的環境。但我們唯一能掌握能就是自己，雖然我們不能像偉人一樣改變世界，但我們卻可以改變自己挑戰自己，心思清楚的走出淤泥而不染。

我希望能透過這個Blog來分享工作成長，記錄我的工作過程，如何思考如何解決問題，所得到及衍生出的專業技能與想法，藉由這分享過程中獲得更多的喜悅。

至航

於民國一百年九月九號首寫