FAT文件系统在NAND Flash存储器上的改进设计
嵌入式系统的大量数据都存储在其F1ash芯片上。根据Flash器件的固有特性，构建一个适合管理NAND Flash存储器的FAT文件系统，并阐述具体的设计思想。该系统改进了FAT表和FRT表的存储方式，延长了存储器的使用寿命，提高了稳定性。
NAND Flash存储器是一种数据正确性非理想的器件，容易出现位反转现象，同时在使用中可能会有坏损单元。数据写入必须在李白的区块或者擦除后的区块巾进行，其底层技术要求以块为单位进行擦除(将“Oxff”写入到要擦除的存储块中)，再按页写入。Flash存储器的擦除次数是有限的，一般是100000次。当某块执行过度的擦除操作后，这一块的存储空间将会变为“只读”状态，不能再写入数据。根据以上特点，为了避免某些块的过度操作，而导致存储卡使用寿命降低，设计专门针对Flash存储器的文件系统是必要的。
1 NAND FIash存储器的特点
NAND Flash存储器的读取操作与普通SRAM存储器类似，可以随机读取，读出的速度也很快。芯片� ......
sudo gedit /etc/fonts/conf.avail/49-sansserif.conf
将
<edit name="family" mode="append_last">
<string>sans-serif</string>
</edit>
改为
<edit name="family" mode="append_last">
<string>sans serif</string>
</edit>
或者其它字体：如文泉驛正黑
......
package
{
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.system.fscommand;
import flash.display.StageDisplayState;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
/**
* ...
* @author LittleSpace
*/
public class Main extends Sprite
{
public function Main ()
{
mc.addEventListener (MouseEvent.MOUSE_DOWN, mouseDownHandler);
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
stage.addEventListener ( KeyboardEvent.KEY_DOWN, onKeyDowns );
}
private function mouseDownHandler(e)
{
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
}
protected function onKeyDowns (e:KeyboardEvent):void
{
if (e.keyCode == Keyboard.ESCAPE)
{
e.preventDefault ();
}
}
}
} ......
package
{
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.system.fscommand;
import flash.display.StageDisplayState;
import flash.events.KeyboardEvent;
import flash.events.Event;
import flash.ui.Keyboard;
/**
* ...
* @author LittleSpace
*/
public class Main extends Sprite
{
private var array:Array=new Array();
public function Main ()
{
mc.addEventListener (MouseEvent.MOUSE_DOWN, mouseDownHandler);
stage.nativeWindow.addEventListener (Event.CLOSING,closing);
}
private function mouseDownHandler (e)
{
//全屏
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
}
private function closing (event:Event):void
{
//取消事件的默认行为，在实际使用时可以指定条件来执行这句话
event.preventDefault ();
}
protected function onKeyDowns (e:KeyboardEvent):void
{
if (e.keyCode == Keyboard.ESCAPE)
{
e.preventDefault ();
}
}
}
}
关闭不了窗体请使用任务管理器，结 ......
Apple has a long relationship with Adobe. In fact, we met Adobe’s founders when they were in their proverbial garage. Apple was their first big customer, adopting their Postscript language for our new Laserwriter printer. Apple invested in Adobe and owned around 20% of the company for many years. The two companies worked closely together to pioneer desktop publishing and there were many good times. Since that golden era, the companies have grown apart. Apple went through its near death experience, and Adobe was drawn to the corporate market with their Acrobat products. Today the two companies still work together to serve their joint creative customers – Mac users buy around half of Adobe’s Creative Suite products – but beyond that there are few joint interests.
I wanted to jot down some of our thoughts on Adobe’s Flash products so that customers and critics may better understand why we do not allow Flash on iPhones, iPods and iPads. Adobe has characterize ......
1,FLASH是什么?
FLASH电影是专为网页服务的画像或动画(当然，也可用于其它用途)。主要含有矢量图形，但是也可以包含导入的位图和音效，还可以把浏览者输入的信息同交互性联系起来，从而产生交互效果，也可以生成非线性电影动画。该动画可以同其它的WEB程序产生交互作用。网页设计师可以利用FLASH来创建导航控制器、动态LOGOS、含有同步音效的长篇动画、甚至可以产生完整的、富于敏感性的网页。
2,怎样做一个简单地FLASH动画?
首先,打开你的FLASH软件,绘制一个圆形(左面地圆形工具可以直接绘制),然后按F8添加为一个Symbol,再图层第十祯地位置按F6键添加一个关键祯,并适当移动该Symbol的位置,最后在第一祯位置点鼠标右键选择Motion就行了.
3,什么叫矢量图?
矢量图可以任意缩放而不影响Flash的画质，位图图像一般只作为静态元素或背景图，Flash并不擅长处理位图图像的动作，应避免位图图像元素的动画。
4,如何迅速地对齐不同Frame中的物件?
用 Inspector “Ctrl+Alt+I” 直接输入坐标。
或是工具栏〉〉窗口〉〉面板〉〉排列“Ctrl+K” 调出排列面板来。图例
5,怎样调节一个Symbol/MC地透明度?
选中Symbol/MC,菜单栏找到Modify(修改) 〉〉 Instanc ......
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