經濟預測的歷史-教科書系統程式.ppt

Micro C/OS II 作業系統 Micro C/OS II 簡介 全名：Micro-Controller Operating Systems, Version 2 參考 Jean J. Labresse, “MicroC/OS-II: The Real-Time Kernel,” CMP Book, ISBN:1-57820-103-9 http://www.uCOS-II.com Micro C/OS II 的特性 特性 一種嵌入式即時作業系統，C語言寫成的 Preemptible priority-driven real-time scheduling. 非常小、原始碼 5500 行，編譯後占記憶體 20KB 非開放原始碼，亦非免費，但可取得程式碼 64 priority levels (max 64 tasks) 8 reserved for uC/OS-II Each task is an infinite loop. Deterministic execution times for most uC/OS-II functions and services. Nested interrupts could go up to 256 levels. Supports of various 8-bit to 64-bit platforms: x86, 68x, MIPS, 8051, etc Easy for development: Borland C++compiler and DOS (optional). However, uC/OS-II still lacks of the following features: Resource synchronization protocols. Sporadic task support. Soft-real-time support. Getting started with uC/OS-II! See how a uC/OS-II program looks like. Learn how to write a skeleton program for uC/OS-II. How to initialize uC/OS-II? How to create real-time tasks? How to use inter-task communication mechanisms? How to catch system events? Mail Box A mailbox is for data exchanging between tasks. A mailbox consists of a data pointer and a wait-list. OSMboxPend(): The message in the mailbox is retrieved. If the mailbox is empty, the task is immediately blocked and moved to the wait-list. A time-out value can be specified. OSMboxPost(): A message is posted in the mailbox. If there is already a message in the mailbox, then an error is returned (not overwritten). If tasks are waiting for a message from the mailbox, then the task with the highest priority is removed from the wait-list and scheduled to run. Message Queue A message queue consists of an array of elements and a wait-list. Different from a mailbox, a message queue can hold many data elements (in a FIFO basis). Hooks (User Customizable) void OSInitHookBegin (void) void OSInitHookEnd (void) void OSTaskCreateHook (OS_TCB *ptcb) void OSTaskDelHook (OS_TCB *ptcb) void OSTaskIdleHook (void) void O