μC/OS-II 是一套開放原始碼的嵌入式即時作業系統，但是它只具備了作業系統最
基本的程序管理、記憶體管理及時間管理這三項功能，雖然這三項功能已足夠應付簡單
的控制，但對於多媒體影音的嵌入式系統而言，檔案管理系統則是另一項必備的功能，
因此本論文將實作一個適用於μC/OS-II 的FAT32 檔案系統，在ARM CPU 架構的平台上
發展出一個嵌入式即時多媒體系統。
在實作檔案系統的過程中，必須有動態記憶體管理支援，但是μC/OS-II 所提供記
憶體管理功能是屬於靜態的記憶體管理，因此本論文也實作了一個動態記憶體管理系
統，此動態記憶體管理系統除了檔案系統的實作必備之外，也可提供給其它應用程式使
用。
為了多媒體的支援，本論文還將JPEG 圖片解碼程式庫(LIBJPEG)及MP3 解碼程式庫
(LIBMAD)移植到μC/OS-II，由於我們實作的檔案系統是符合POSIX 標準，因此在移植的
過程可以不用做任何的程式碼修改。
μC/OS-II 具有即時(Real-Time)的特性，擁有最高權限的程序(Task)會一直使用
CPU 資源，直到程式結束，然而有時候我們希望能夠也有時間共享(Time Sharing)的機
制，讓每個程序都能使用CPU，因此本論文也將修改μC/OS-II 的程序管理，讓系統除了
具有即時的特性之外，同時也能具有時間共享(Time-Sharing)的機制。
嵌入式系統中，良好的使用者圖形操作介面(GUI)也是必備的功能，本論文也實作一
個簡單的GUI 介面，讓使用者能夠透過觸控式螢幕，直接和系統溝通，為了方便中文使
用者的操作，本論文也提供了中文點陣字型的支援，我們針對現有BDF 及PCF 點陣字型
的缺點，改良成為一種新的點陣字型檔案儲存格式HCF，它的檔案大小是原始BDF 字型
檔的五分之一，非常適合用在嵌入式系統上使用。

μC/OS-II is a open source embedded Real-Time Operating System. But it only has three basic
functions task management, time management and memory management of Operating System.
Alought these function is enouhgt for simply control, but it is essential to have FileSystem
support for an embedded multimedia system. In this paper, we develop a FAT32 FileSystem in
μC/OS-II based on ARM platform, and then implement an embedded multimedia system.
It is essential to have dynamic memory management (DMM) support. But the μC/OS-II only
supports static memory management. So we implement a DMM at first. This DMM can
supply dynamic allocate functions for FileSystem and other application.
In order to support multimedia, we port the MP3 decode library, LIBMAD and JPEG decode
library, LIBJPEG to our system too. Because the files operating function supplied by our
FileSystem are follow POSIX standard. So we can port LIBJPEG and LIBMAD library to our
system easily. And without change any source code.
μC/OS-II is a real-time Operating System. The highest priority task will have CPU resource
until finished. The lower priority task must wait until highest finished. But somethime, we
may need it support time-sharing, let every task can sharing the CPU resource. In this paper,
we will fix the μC/OS-II scheduler mechanism, let μC/OS-II support real-time and non
real-time task at the same time.
Recently, Graphaic User Interfac (GUI) became a necessary function for embedded system.
We implement a simple GUI , user can communication with embedded system by touch panel.
And for Chinese user convenience, we also implement Chinese font support by using bitmap
font. We create a new bitmap font file format HCF by fixing the BDF and PCF font file format.
And HCF is one-fifths file size then original BDF. It is more suited to embedded system.

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