git 同時開發範例

一開始有aaa與bbb目錄

git-test/
|-- aaa
`-- bbb

A用aaa當作程式放置的目錄, 先對他做初始化

cd git-test/aaa
git init

複製以前寫的某一隻程式至此目錄

git-test/
|-- aaa
| |-- main
| `-- main.c
`-- bbb

加入此目錄所有檔案給git管理

git add .

第一次commit

git commit
(之後可以輸入這次commit的註解)

發現有一個檔案是編譯出來的二進位檔, 不需要追蹤這個檔案

git rm main

git-test/
|-- aaa
| `-- main.c
`-- bbb

要習慣做完一個階段之後就commit

git commit -a

假設臨時需要用到之前被砍掉的main, 可以切換回去過去的狀態

先用git log看要回去的那次commit的編號

commit 93056170a2f98563ba13f1b4679a73655a64c2fb
Author: chihying
Date: Tue Feb 23 20:29:55 2010 +0800

remove output files


commit 3ecb40595863e67b5b6f5ea06b8e75dfcad85848
Author: chihying
Date: Tue Feb 23 20:28:26 2010 +0800

first add all files



切換回去一開始那次的commit, 整個資料夾就回復了

git checkout 3ecb40595863e67b5b6f5ea06b8e75dfcad85848

git-test/
|-- aaa
| |-- main
| `-- main.c
`-- bbb

新增了一個Makefile

git-test/
|-- aaa
| |-- Makefile
| `-- main.c
`-- bbb

加入管理git add Makefile

git commit

若目前有另外一個人B也要一起開發這個程式, 他的工作目錄在bbb

cd git-test/bbb
git clone [aaa的路徑]
這樣在B就也有一份程式了

bbb
`-- aaa
|-- Makefile
`-- main.c

假設目前A有對程式做修改,B想取得最新的更動

git pull

B要做一些修改, 先開一個branch

git branch B_modify
可用git branch查看

B_modify
* master



切換branch
git checkout B_modify

* B_modify
master

A B都修改/commit了一些東西之後，B要把他在B_modify的修改merge回去

先跳回master
git branch master
從aaa抓最新的修改
git pull ../../aaa
把B_modify的修改合併到master上面
git merge B_master
把更新上傳至aaa
git push

找尋程式中使用哪些define的flag做判斷

一般程式會在編譯時定義一些flag來決定是否啟動某功能的支援，

而在程式內的實作會使用ifdef XXX來判斷，

可以用以下的script找出所有用ifdef判斷的flag，

來確認所需的功能是否在編譯時有加入

1. 搜尋所有ifdef

2. 取得第二個欄位的資料

3. 排序(刪去重複)

grep -rns ifdef * | awk '{FS=" "} {print $2}' | sort -u

use ssh tunnel to connect

A: local machine, can access B

B: ssh server(windows can use openssh for ssh server)

C: A cannot access, but B can

in A, use:

ssh -NfL [A port]:[C IP]:[C port] [B id]@[B IP]

then in A machine you can use localhost:[A port] as [C IP]:[C port]

if B is not a ssh server but have ssh client

you can reverse ssh tunnel

in B, use:

ssh -NfR [A port]:[C IP]:[C port] [A id]@[A IP]

在ubuntu mount另一台ubuntu架的samba

sudo mount -t cifs //192.168.2.3/chihying /home/XXXX -o username=XXXX -o password=XXXX -o iocharset=utf8

原本使用 mount -t smbfs一直失敗

改用cifs就成功了

mount: wrong fs type, bad option, bad superblock on //192.168.2.3/chihying,

missing codepage or helper program, or other error

(for several filesystems (e.g. nfs, cifs) you might

need a /sbin/mount. helper program)

In some cases useful info is found in syslog - try

dmesg | tail or so


使用其他帳號開的分享，掛上去之後發現沒有寫入權限
解決方法: 加入 -o noperm
ex:
sudo mount -t cifs //192.168.2.3/chihying /home/XXXX -o username=XXXX -o password=XXXX -o iocharset=utf8 -o noperm

切換ubuntu java版本

編譯新版本的android時跳出須使用java 1.5, 不能使用1.6

所以需要做切換

我是使用

update-alternatives --all

一個個改成1.5，不過太麻煩

應該可以使用下面這種寫法吧.....

sudo update-java-alternatives --set java-1.5.0-sun

http://blog.dzasdever.net/2009/07/ubuntu-java.html

tar加上分割檔案

今天要把資料打包放到隨身碟上，
不過卻發現隨身碟為fat32,不支援單一大檔案,
所以google一下方便的分割方法

參考：

http://blog.24reader.com/vincentlam/2009/04/22/%E4%BD%BF%E7%94%A8tar%E6%89%93%E5%8C%85%E5%A3%93%E7%B8%AE%E4%B8%A6%E5%88%86%E5%89%B2%E7%82%BA%E5%9B%BA%E5%AE%9A%E5%A4%A7%E5%B0%8F%E7%9A%84%E6%AA%94%E6%A1%88/
http://lovejuan1314.javaeye.com/blog/457841


原本壓縮：
tar -zcvf XXXX.tar.gz XXXX

原本解壓縮：
tar -zxvf XXXX.tar.gz



壓縮並分割：
tar -zcvf- XXXX| split -a 1 -b 1000m - ./XXXX.tar.gz.
壓縮結果：
XXXX.tar.gz.a
XXXX.tar.gz.b
XXXX.tar.gz.c
...

解壓縮：
cat XXXX.tar.gz* | tar -zxvf-

android property

關於android property的一些介紹
http://blog.csdn.net/loughsky/archive/2008/11/14/3297286.aspx
http://owenhuangtw.pixnet.net/blog/post/24278564

start/stop android's service

今天在trace code時發現到程式裡面使用
property_set("ctl.start", XXXX);
來啟動某服務

服務應該是定義在init.rc內
service XXXX.....

可以手動開啟/關閉服務：
setprop ctl.start XXXX
setprop ctl.stop XXXX

下面連結有講到打開/關閉開機動畫的範例
http://blog.chinaunix.net/u3/90973/showart_2255578.html

算質數

感覺像是以前修課在寫作業


1 #include stdio.h
2 #include stdlib.h
3
4 void calculate(int max){
5 int *result = (int*) malloc(sizeof(int) * max);
6
7 result[0] = result[1] = 0;
8 result[2] = 1;
9
10 for(int i=3; i 11 if(i%2 == 0){
12 result[i] = 0;
13 }
14 else{
15 result[i] = 1;
16 }
17 }
18
19 for(int i=3; i*i<=max; i++){
20 if(result[i]==1){
21 for(int j=i+i; j 22 result[j] = 0;
23 }
24 }
25 }
26
27 for(int i=0; i 28 if(result[i] == 1){
29 printf("%3d ", i);
30 }
31 }
32
33 }
34
35
36 int main(){
37
38 calculate(100);
39
40 return 0;
41 }

calculate PI by rand()

使用機率計算半徑為1的四分之一圓
乘以四之後為一個圓
由於圓的面積為PI＊r＊r，此時r又是1
所以圓面積為PI

===============================
1 #include stdio.h
2 #include stdlib.h
3 #include math.h
4
5 void get_value(int sum){
6 double x,y;
7 double tmp;
8 int count = 0;
9 int i = 0;
10
11 srand(0);
12
13 do{
14 x = (double) rand()/RAND_MAX;
15 y = (double) rand()/RAND_MAX;
16
17 tmp = x*x + y*y;
18
19 if(sqrt(tmp)<=1){
20 count++;
21 }
22
23 }while(++i < sum);
24
25 printf("result: %lf \n", 4 *((double)count/sum));
26 return;
27 }
28
29 int main(){
30
31 get_value(10000000);
32
33 return 0;
34 }

c++ inheritance about constructor/destructor/override/virtual function

1 #include
2 using namespace std;
3
4 class A{
5 public:
6 A(){
7 cout << "1" << endl;
8 }
9
10 void func1(){
11 cout << "2" << endl;
12 }
13
14 virtual void func2(){
15 cout << "3" << endl;
16 }
17
18 ~A(){
19 cout << "4" << endl;
20 }
21
22
23 };
24
25 class B:A{
26 public:
27 B(){
28 cout << "5" << endl;
29 }
30
31 void func1(){
32 cout << "6" << endl;
33 }
34
35 virtual void func2(){
36 cout << "7" << endl;
37 }
38
39 ~B(){
40 cout << "8" << endl;
41 }
42
43 };

1 #include iostream
2 #include "my-header.h"
3
4 int main(void){
5
6 A *ptr;
7
8 B *my_B = new B();//1 5
9
10 ptr = (A*)my_B;
11
12 ptr->func1();//2
13 ptr->func2();//7
14
15 my_B->func1();//6
16 my_B->func2();//7
17
18 delete my_B;//8 4
19
20 return 0;
21 }

c++ operator overload

myClass.h

1 #include "myClass.h"
2
3 myClass operator+(myClass c, int i){
4 myClass tmp(c.value() + i);
5 return tmp;
6 }
7
8 myClass operator+(int i, myClass c){
9 myClass tmp(c.value() + i);
10 return tmp;
11 }
12
13 myClass operator-(myClass c, int i){
14 myClass tmp(c.value() - i);
15 return tmp;
16 }
17
18 myClass operator-(int i, myClass c){
19 myClass tmp(c.value() - i);
20 return tmp;
21 }
22
23 myClass operator++(myClass &c){
24 c.n++;
25 return c;
26 }
27
28 myClass operator++(myClass &c, int i){
29 myClass tmp(c.value());
30 c.n++;
31 return tmp;
32 }
33
34 myClass operator--(myClass &c){
35 c.n--;
36 return c;
37 }
38
39 myClass operator--(myClass &c, int i){
40 myClass tmp(c.value());
41 c.n--;
42 return tmp;
43 }

myClass.c

1 class myClass{
2 public:
3 myClass(){
4 n=0;
5 }
6
7 myClass(int in){
8 n = in;
9 }
10
11 myClass operator+(myClass c){//only for "myClass + myClass"
12 myClass tmp(n+c.value());
13 return tmp;
14 }
15
16 myClass operator-(myClass c){
17 myClass tmp(n-c.value());
18 return tmp;
19 }
20 /*
21 myClass& operator++(){//for ++myClass //& for reduce copy object?
22 n++;
23 return *this;//"this" is a pointer
24 }
25
26 myClass operator++(int i){//for myClass++
27 myClass tmp(n);
28 n++;
29 return tmp;
30 }
31
32 myClass& operator--(){
33 n--;
34 return *this;
35 }
36
37 myClass operator--(int){
38 myClass tmp(n);
39 n--;
40 return tmp;
41 }
42 */
43
44 friend myClass operator+(myClass c, int i); //for myClass + int
45
46 friend myClass operator+(int i, myClass c); //for int + myClass
47
48 friend myClass operator-(myClass c, int i);
49
50 friend myClass operator-(int i, myClass c);
51
52
53 friend myClass operator++(myClass &c);//for ++myClass
54
55 friend myClass operator++(myClass &c, int);//for myClass++
56
57 friend myClass operator--(myClass &c);//for --myClass
58
59 friend myClass operator--(myClass &c, int);//for myClass--
60
61 int value(){
62 return n;
63 }
64 private:
65 int n;
66 };

C++ called by reference

參考http://caterpillar.onlyfun.net/Gossip/CppGossip/PassBy.html

int main(){

int x = 10;

printf("%d\n", inc(x));

printf("%d\n", x);

return 0;

}

int inc(int n){

n = n+1;

return n;

}

若程式這樣寫，則印出來為：

11

10

因為n與x是不同的變數（called by value）

==============================================

int main(){

int x = 10;

printf("%d\n", inc(x));

printf("%d\n", x);

return 0;

}

int inc(int *n){

*n = *n+1;

return *n;

}

使用指標的方式輸出為：

11

11

========================================

int main(){

int x = 10;

printf("%d\n", inc(x));

printf("%d\n", x);

return 0;

}

int inc(int &n){

n = n+1;

return n;

}

若在function的參數中加上&，則代表int &n = x

(n為x的一個別名,改變n,x會一起變)

這樣輸出也是：

11

11

=========================================

若不准傳進function的參數遭到修改的話,可以使用const

int my_function(const int &in){

...

}

flash memory

裡面圖很多都是網路上抓的

linux kernel compile & install

compile cyanogenmod android by your self for Nexus One

There is a detail steps in cyanogenmod's wiki(Passion equals Nexus One?)
http://wiki.cyanogenmod.com/index.php?title=Compile_CyanogenMod_for_Passion

I follow instructions on that wiki, finally build a bootable ROM,
then I can modify every where interested!

currently have some problems(no IME, error in quick setting...)

電波錶

http://tw.alfaso.com/blog/radio_clock/300

原來電波錶是接收日本那邊發射的無線電波來校正時間，並不是接收衛星（gps）的訊號

如果有一個可以接收gps訊號的手錶，就可以接收gps衛星上面的原子鐘時間得到跟電波錶一樣準的時間
不過gps的耗電量應該很驚人....
而且gps要在室外才收得到訊號不夠實用

signal 與鍵盤的對應

SIGINT - CTRL-C （中斷字元）
SIGQUIT - CTRL-\ （關閉字元）
SIGTSTP - CTRL-Z （終端機停止訊號）

捕捉這些訊號就可以讓自己寫的終端機程式送出相對應的控制字元

ascii的前面幾個是控制字元
http://home.educities.edu.tw/wanker742126/asm/ap04.html

android apn 預設設定檔

若要修改預設的apn資訊...

1. 直接修改裝置上的/etc/apns-conf.xml，刪除 ./data/com.android.providers.telephony/databases/telephony.db，並重新開機
2. 編BSP時包進去需放在 mydroid/development/data/etc/apns-conf_sdk.xml（注意檔名），若放在 mydroid/out/product/.../system/etc 下重編時會被developement目錄的那個檔蓋掉！

簡易vim使用

study area有比較詳細的教學

http://www.study-area.org/tips/vim/index.html

命令模式時：

• 基本操作

1. 上 k
2. 下 j
3. 左 h
4. 右 l
5. 複製(行) yy(Y) 2yy(複製兩行) yG(複製到檔尾) y[xx]G(複製到xx行)
6. 貼上 p
7. 復原 u
8. 尋找 /(往下) ?（往上） 可用n N移動到下一個
9. 尋找游標處的字 *(往下) #（往上） 可用n N移動到下一個
10. 移動游標 gg(檔頭) G(檔尾) :xx（到xx行）^(行首) $(行尾)
11. 翻頁 ctrl-f(pageup) ctrl-b(pagedown)
12. 重複上一個動作 .

• 程式設計

1. 找出此變數定義的地方 gd
2. 找出與游標處配對的括號 %
3. 到目前function開頭 [[
4. 到下個function開頭 ]]

C alarm() - 系統經過特定時間之後發sigalarm給程式

http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/apis/sigalarm.htm

程式在做一些timeout的功能時用alarm()很方便！

syslog - 寫入資訊至系統的log

參考http://blog.csdn.net/yulanarti/archive/2007/09/13/1783839.aspx




#include
void openlog (char*ident,int option ,int facility);
void syslog(int priority,char*format,……)
void closelog();

在程式內執行系統指令並取得回結果

使用popen（）

參考http://www.lix.polytechnique.fr/~liberti/public/computing/prog/c/C/FUNCTIONS/popen.html


FILE *popen(const char *command, const char *type);
執行某指令並把stdout的值放入檔案並回傳
若要取得stderr可以在指令後加上 "2>&1"

用完後要使用pclose（）關閉檔案


example:

/*
* Purpose: Program to demonstrate the popen function.
*
* to do: Check that the 'popen' was successfull.
*
* Author:  M J Leslie.
* Date:    08-Jan-94
*/

#include 

main()
{
 FILE *fp;
 char line[130];   /* line of data from unix command*/
 
 fp = popen("ls -l", "r");  /* Issue the command.  */

     /* Read a line   */
 while ( fgets( line, sizeof line, fp))
 {
   printf("%s", line);
 }
 pclose(fp);
}

ganttproject - 畫甘特圖的軟體

http://www.ganttproject.biz/

蠻簡單的甘特圖軟體，使用java寫的，檔案使用xml格式儲存


不過發現下載回來的版本中文字型顯示有問題，全部變半形
但是線上版本運作就正常，所以就直接抓線上運作的版本，在本地執行

/usr/lib/jvm/java-6-sun-1.6.0.20/bin/javaws -offline /home/xxxx/ganttproject-2.0.10.jnlp

使用蜂鳴器通知某指令完成

1.先寫一隻能夠使蜂鳴器發出聲音的程式

  //b2.c
  #include   
  #include   

  void   play(unsigned   int*   freq,   unsigned   int*   delay);

  int main(int argc, char* argv[])
  {
        speaker(330, 5);
        speaker(  0, 5);
        speaker(330, 5);

        return 0;
  }
  
  int   speaker(unsigned   int   freq,unsigned   int   delay)
  {   static   int   flag=0,bit;
          if(flag==0)
          {
                  flag=1;
                  iopl(3);
          }
          outb(0xb6,0x43);
          outb((freq   &   0xff),0x42);
          outb((freq   >>   8),0x42);
          bit=inb(0x61);
          outb(3   |   bit,0x61);
          usleep(10000*delay);
          outb(0xfc   |   bit,0x61);
        return;
  }

2.beep：一個shell script使b2在指令完成時執行

$*
sudo ./b2

3.把b2 and beep放至/bin

4.由於b2發出聲音要有root的權限，所以b2擁有者要設為root，然後對beep作setuid
http://www.google.com/url?q=http%3A%2F%2Flinux.vbird.org%2Flinux_basic%2F0220filemanager.php%23suid&sa=D&sntz=1&usg=AFrqEzfx6HcqK_4BpogqAlU2s7Ts5ttsug

debug USB - use usbmon, usbfs

dump urb data 編kernel時,在driver/usb/下選擇usb monitor mount -t debugfs debugfs /sys/kernel/debug 之後在此目錄下就會看到usbmon目錄 可以在此dump出urb的資料(ascii) 可以使用/dev/usbmon[XX]來dump出raw data，之後自己寫程式去parse 詳細文件參考Documentation/usb/usbmon.txt 查看linux上所有USB裝置的詳細資訊 mount -t usbfs usbfs /proc/bus/usb/ cat /proc/bus/usb/devices 各攔位介紹 http://www.linux-usb.org/USB-guide/c607.html 詳細文件: Documentation/usb/proc_usb_info.txt /proc/bus/usb/devices各欄位資料 T開頭(topology) Bus: which bus the device is on Lev: the level of the device level 00 for the root hub level 01 for any device attached to the root hub level 02 for devices attached to hubs at level 01, and so on. Prnt: the parent device for this device always 00 for the root hub 01 for the devices attached to the root hub Port: the port on the parent device starting at 00 for the first port on each device. Prnt/Port is unique per bus. Cnt: what number device this is, based on the enumeration order within that level of the topology, starting at 01 for the first device. Dev#: what number device this is, irrespective of level, based on the bus enumeration order. This is unique per bus Spd: what speed this device is running at, in Mbps (either 1.5 or 12 with the current version of USB). MxCh: how many devices can be connected to this device 00 for anything except a hub. Driver: which device driver is being used for this device an entry of (none) indicates that no driver is being used. D開頭(device descriptor) Ver: which USB specification version the device claims to meet. Cls: which device class the device is claiming to meet, in both hexadecimal and as a string. A Cls entry of 00(>ifc) indicates that the device class specification compliance is interface dependent, and the interface descriptor should be read for device class information. Sub: which sub-class (within the Cls entry), the device meets. Prot: which protocol within a class or sub-class the device claims to meet. MxPS: how big the packets from Endpoint 0 are. #Cfgs: how many configurations this device has. P開頭(pid/vid) Vendor: the Vendor Identification code for the device ProdID: the Product Identification code for the device. Rev: the product revision number. S開頭: vendor and product strings that the device returned. C開頭(configuration descriptor) the number of C:lines per device is given by #Cfgs, and the entry followed by an asterisk is the current configuration. #If: how many interfaces the device has. Cfg#: which configuration is being described. Atr: hexadecimal indication of the device attributes 0x80 for bus-powered 0x40 for self-powered 0x20 for remote wake-up capable MxPwr: maximum power draw for this device configuration, in milliamps(mA). I開頭(interface descriptor) If#: which interface is being described within a given device configuration. Alt: which alternate setting of this interface is being described. #EPs: how many endpoints there are within the alternate setting for this endpoint. Cls: which class the alternate setting of the interface corresponds to, in both hexadecimal and as a character string. Sub: which sub-class the alternate setting of the interface belongs to. Prot: which interface protocol (within a class and sub-class tuple) the alternate setting of the interface conforms to. Driver: which of the various USB drivers has claimed this interface. E開頭(endpoint descriptor) Endpoint 0 is not displayed. Ad: endpoint address, with a letter to indicate whether the endpoint is an In or Out endpoint. Atr: the attribute (transfer type) associated with the endpoint, followed by a string translating the transfer type. MxPS: maximum packet size this endpoint is capable of sending or receiving, as appropriate. Ivl: the interval, in milliseconds, between polling of interrupt endpoints. ignored for bulk and control transfers, and is set to 1 for isochronous transfers. ================================================= example root@ocgod-ubuntu9:/proc/bus/usb# cat devices T: Bus=05 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1d6b ProdID=0001 Rev= 2.06 S: Manufacturer=Linux 2.6.28-18-generic uhci_hcd S: Product=UHCI Host Controller S: SerialNumber=0000:00:10.3 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1d6b ProdID=0001 Rev= 2.06 S: Manufacturer=Linux 2.6.28-18-generic uhci_hcd S: Product=UHCI Host Controller S: SerialNumber=0000:00:10.2 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1d6b ProdID=0001 Rev= 2.06 S: Manufacturer=Linux 2.6.28-18-generic uhci_hcd S: Product=UHCI Host Controller S: SerialNumber=0000:00:10.1 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 34/900 us ( 4%), #Int= 3, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1d6b ProdID=0001 Rev= 2.06 S: Manufacturer=Linux 2.6.28-18-generic uhci_hcd S: Product=UHCI Host Controller S: SerialNumber=0000:00:10.0 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=13ba ProdID=0017 Rev= 0.01 S: Product=Generic USB K/B C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=24ms I:* If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid E: Ad=82(I) Atr=03(Int.) MxPS= 5 Ivl=10ms T: Bus=02 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=04d9 ProdID=0499 Rev= 2.90 C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 8 B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=1d6b ProdID=0002 Rev= 2.06 S: Manufacturer=Linux 2.6.28-18-generic ehci_hcd S: Product=EHCI Host Controller S: SerialNumber=0000:00:10.4 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

在linux 下使用rdesktop連線windows 遠端桌面

在ubuntu中可以使用內建的圖形化介面：tsclient
不過他預設的解析度只有固定幾個，無法改變
(就直接修改tsclient存下來的設定檔，也只會跳到最接近的選項)

所以可以使用rdesktop指令：

rdesktop -u cyl -p passwd -g 1280x1000 -a 24 192.168.0.XXX -x nr

rdesktop: A Remote Desktop Protocol client.
Version 1.6.0. Copyright (C) 1999-2008 Matthew Chapman.
See http://www.rdesktop.org/ for more information.

Usage: rdesktop [options] server[:port]
   -u: user name
   -d: domain
   -s: shell
   -c: working directory
   -p: password (- to prompt)
   -n: client hostname
   -k: keyboard layout on server (en-us, de, sv, etc.)
   -g: desktop geometry (WxH)
   -f: full-screen mode
   -b: force bitmap updates
   -L: local codepage
   -A: enable SeamlessRDP mode
   -B: use BackingStore of X-server (if available)
   -e: disable encryption (French TS)
   -E: disable encryption from client to server
   -m: do not send motion events
   -C: use private colour map
   -D: hide window manager decorations
   -K: keep window manager key bindings
   -S: caption button size (single application mode)
   -T: window title
   -N: enable numlock syncronization
   -X: embed into another window with a given id.
   -a: connection colour depth
   -z: enable rdp compression
   -x: RDP5 experience (m[odem 28.8], b[roadband], l[an] or hex nr.)
   -P: use persistent bitmap caching
   -r: enable specified device redirection (this flag can be repeated)
         '-r comport:COM1=/dev/ttyS0': enable serial redirection of /dev/ttyS0 to COM1
             or      COM1=/dev/ttyS0,COM2=/dev/ttyS1
         '-r disk:floppy=/mnt/floppy': enable redirection of /mnt/floppy to 'floppy' share
             or   'floppy=/mnt/floppy,cdrom=/mnt/cdrom'
         '-r clientname=': Set the client name displayed
             for redirected disks
         '-r lptport:LPT1=/dev/lp0': enable parallel redirection of /dev/lp0 to LPT1
             or      LPT1=/dev/lp0,LPT2=/dev/lp1
         '-r printer:mydeskjet': enable printer redirection
             or      mydeskjet="HP LaserJet IIIP" to enter server driver as well
         '-r sound:[local[:driver[:device]]|off|remote]': enable sound redirection
                     remote would leave sound on server
                     available drivers for 'local':
                     alsa: ALSA output driver, default device: default
                     oss: OSS output driver, default device: /dev/dsp or $AUDIODEV
         '-r clipboard:[off|PRIMARYCLIPBOARD|CLIPBOARD]': enable clipboard
                      redirection.
                      'PRIMARYCLIPBOARD' looks at both PRIMARY and CLIPBOARD
                      when sending data to server.
                      'CLIPBOARD' looks at only CLIPBOARD.
   -0: attach to console
   -4: use RDP version 4
   -5: use RDP version 5 (default)
   -y: use raw keyboard (default no)

簡易連線uart的程式

本來是想要把minicom搬到android上，不過他的source code很多，也蠻複雜的，
後來在網路上找到tick_minicom，只有幾個檔案，應該很容易讓他編進android

tick_minicom：簡單的uart程式
http://linuxocarina.blogspot.com/2007/09/minicom.html

不過我的連線設定跟他不一樣，所以參考以下網站對程式做了一些修改之後就可以使用了
http://book.51cto.com/art/200711/59758.htm

int
set_baud (int fd, int rate)
{
 int i, rt;

 u_int32_t bd = 0;

 struct termios ti;

 //select baudrate
 for (i = 0; i < ARRAY_SIZE (bdrts); i++) {
  if (bdrts[i].bps == rate) {
   bd = bdrts[i].b;
   debug("select baudrate: %d\n",rate);
   break;
  }
 }
 if (bd == 0) {
  error ("Cannot set Baud Rate!!\n");
  return -1;
 }

 //set baudrate
 rt = tcgetattr (fd, &ti);
 if (rt < 0) {
  error ("Cannot get attr i=%d\n", rt);
  return rt;
 }

 debug ("Open uart input with speed %d\n", bdrts[i].bps);
 //rt = cfsetispeed (&ti, B0);
 rt = cfsetispeed (&ti, bd);
 if (rt < 0) {
  //error ("Cannot set input baud to B0!!\n");
  error ("Cannot set input baud to bd!!\n");
  return rt;
 }

 debug ("Open uart output with speed %d\n", bdrts[i].bps);
 rt = cfsetospeed (&ti, bd);
 if (rt < 0) {
  error ("Cannot set baud rate %d\n", bdrts[i].bps);
  return rt;
 }

 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }

 //set no hareware conrtol
 rt = tcgetattr (fd, &ti);
 //ti.c_cflag |= CRTSCTS; // hardware control
 ti.c_cflag &= ~CRTSCTS;  // no hardware control
 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }


 //set databit:8
 rt = tcgetattr (fd, &ti);
 ti.c_cflag&=~CSIZE;
 ti.c_cflag |=CS8;
 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }


 //set no parity bit
 rt = tcgetattr (fd, &ti);
 ti.c_cflag &= ~PARENB;
 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }


 return rt;
}

解決ubuntu 10.04 中minicom放大到全螢幕會閃爍的問題

參考 http://blog.xuite.net/yctseng/notes/26134176

使用：

alias minicom='TERM=linux /usr/bin/minicom'

使用shell script計算CPU使用率

PROGRAM_NAME --程式名稱

DELAY ---------每隔多久看一次CPU usage

NUMBER --------總共看幾次

取得系統CPU使用率：

top -b -n NUMBER -d DELAY | tee top.log

cat top.log | grep CPU: | awk '{print $8}' | sed s/%//g

若要查看某程式的cpu使用率

cat top.log | grep -v grep | grep PROGRAM_NAME | awk '{print $7}'| sed s/%//g

example:

假設要看hello程式, 一分鐘內每隔一秒的CPU使用率：

top -b -n 60 -d 1 | grep -v grep | grep hello | awk '{print $7}'| sed s/%//g

輸出結果：

0

9

5

2

1

2

2

2

4

2

2

3

3

1

2

3

2

3

2

0

.....

腳踏車變速器/剎車調整

我是用:
SHIMANO TY-22中變速器
SHIMANO TOURNEY TX-31 FOR 21SPEED 後變速器
SHIMANO EF50上下按鍵式變把
SHIMANO MFTZ21 7速飛輪

中變:
1.在把手上有微調旋鈕，先調整至在中間那一檔能夠順利往上下檔位切換
2.調整high/low螺絲限制最高與最低檔位的位置至適當距離

後變:
1.微調旋鈕在後變上，調整至後變中間幾個檔位切換順暢
2.調整high/low螺絲限制後變最高與最低檔位的位置至適當距離

剎車:
1.調整變速器上的微調旋鈕使剎車按壓的距離至適當位置
2.調整V型剎車組的彈簧微調螺絲使得兩邊彈力差不多，剎車皮與輪圈之間距離相同

在linux下使用LFTP多點下載

參考 http://yurinfore.blogspot.com/2009/10/linux.html

改成可以控制下載thread數量
function pget()
{
thread=5

case $# in
1)
addr=$1
;;
2)
thread=$1
addr=$2
;;
*)
echo "usage:"
echo "pget [URL] (default thread:5)"
echo "or"
echo "pget [thread] [URL]"
exit 1
;;
esac


echo thread : $thread
echo address : $addr
cmd="pget -n $thread $addr; exit"
lftp -e "$cmd"
}

linux 上的dnw程式

由於工作機是linux,每次要燒image都要切到windows不方便，

在網路上有找到別人寫的dnw程式，不過沒有作checksum的部份，就把他補上去了

ps.

1.系統需要先安裝libusb

2.使用時vid/pid可能需要依據裝置修改

/*

* cy add checksum

* use: gcc dnw2.c -o dnw2 -lusb -g

*/

/* dnw2 linux main file. This depends on libusb.

*

* Author: Fox

* License: GPL

*

*/

#include

#include

#include

#include

#include

#include

#define QQ2440_SECBULK_IDVENDOR 0x04e8

#define QQ2440_SECBULK_IDPRODUCT 0x1234

struct usb_dev_handle * open_port()

{

struct usb_bus *busses, *bus;

usb_init();

usb_find_busses();

usb_find_devices();

busses = usb_get_busses();

for(bus=busses;bus;bus=bus->next)

{

struct usb_device *dev;

for(dev=bus->devices;dev;dev=dev->next)

{

if( QQ2440_SECBULK_IDVENDOR==dev->descriptor.idVendor

&& QQ2440_SECBULK_IDPRODUCT==dev->descriptor.idProduct)

{

printf("Target usb device found!\n");

struct usb_dev_handle *hdev = usb_open(dev);

if(!hdev)

{

perror("Cannot open device");

}

else

{

int ret;

if(ret = usb_claim_interface(hdev, 0) != 0)

{

perror("Cannot claim interface");

printf("ret=%d\n", ret);

usb_close(hdev);

hdev = NULL;

}

}

return hdev;

}

}

}

printf("Target usb device not found!\n");

return NULL;

}

void usage()

{

printf("Usage: dnw2 \n\n");

}

unsigned char* prepare_write_buf(char *filename, unsigned int *len)

{

unsigned char *write_buf = NULL;

struct stat fs;

int fd = open(filename, O_RDONLY);

if(-1==fd)

{

perror("Cannot open file");

return NULL;

}

if(-1==fstat(fd, &fs))

{

perror("Cannot get file size");

goto error;

}

write_buf = (unsigned char*)malloc(fs.st_size+10);

if(NULL==write_buf)

{

perror("malloc failed");

goto error;

}

if(fs.st_size != read(fd, write_buf+8, fs.st_size))

{

perror("Reading file failed");

goto error;

}

printf("Filename : %s\n", filename);

printf("Filesize : %x bytes\n", (int)fs.st_size);

*((u_int32_t*)write_buf) = 0xC0000000; //download address

*((u_int32_t*)write_buf+1) = fs.st_size + 10; //download size;

//cy: compute checksum

int k;

u_int16_t csum=0;

for(k=0; k<(int)fs.st_size; k++){

csum +=write_buf[8+k];

}

printf("CheckSum=%d\n",(int)csum);

write_buf[fs.st_size+ 8] = csum; //checksum;

write_buf[fs.st_size+ 9] = csum>>8; //checksum;

//printf("write_buf[%d]=%.2x\n", (int)fs.st_size + 8, write_buf[(int)fs.st_size + 8]);

//printf("write_buf[%d]=%.2x\n", (int)fs.st_size + 9, write_buf[(int)fs.st_size + 9]);

*len = fs.st_size + 10;

return write_buf;

error:

if(fd!=-1) close(fd);

if(NULL!=write_buf) free(write_buf);

fs.st_size = 0;

return NULL;

}

int main(int argc, char *argv[])

{

if(2!=argc)

{

usage();

return 1;

}

struct usb_dev_handle *hdev = open_port();

if(!hdev)

{

return 1;

}

unsigned int len = 0;

unsigned char* write_buf = prepare_write_buf(argv[1], &len);

if(NULL==write_buf) return 1;

unsigned int remain = len;

unsigned int towrite;

printf("Writing data ...\n");

while(remain)

{

towrite = remain>512 ? 512 : remain;

if(towrite != usb_bulk_write(hdev, 0x2, write_buf+(len-remain), towrite, 3000))

{

perror("usb_bulk_write failed");

break;

}

remain-=towrite;

printf("\r%d%%\t %d bytes ", (len-remain)*100/len, len-remain);

fflush(stdout);

}

if(0==remain) printf("Done!\n");

return 0;

}