FreeRTOS英文使用教程

www.FreeRTOS.org This document was supplied to jmclurkin@rice.edu
?
?
?
Contents
?
List of Figures vi
?
List of Code Listings viii
?
List of Tables xi
?
List of Notation xii
?
Preface FreeRTOS and the Cortex-M3 1
?
Multitasking on a Cortex-M3 Microcontroller 2
?
An Introduction to Multitasking in Small Embedded Systems 2
?
A Note About Terminology 2
?
Why Use a Real-time Kernel? 3
?
The Cortex-M3 Port of FreeRTOS 4
?
Resources Used By FreeRTOS 5
?
The FreeRTOS, OpenRTOS, and SafeRTOS Family 6
?
Using the Examples that Accompany this Book 8
?
Required Tools and Hardware 8
?
Chapter 1 Task Management 9
?
1.1 Chapter Introduction and Scope 10
?
Scope 10
?
1.2 Task Functions 11
?
1.3 Top Level Task States 12
?
1.4 Creating Tasks 13
?
The xTaskCreate() API Function 13
?
Example 1. Creating tasks 16
?
Example 2. Using the task parameter 19
?
1.5 Task Priorities 22
?
Example 3. Experimenting with priorities 23
?
1.6 Expanding the ‘Not Running’ State 26
?
The Blocked State 26
?
The Suspended State 27
?
The Ready State 27
?
Completing the State Transition Diagram 27
?
Example 4. Using the Blocked state to create a delay 28
?
The vTaskDelayUntil() API Function 31
?
Example 5. Converting the example tasks to use vTaskDelayUntil() 33
?
Example 6. Combining blocking and non-blocking tasks 34
?
1.7 The Idle Task and the Idle Task Hook 37
?
Idle Task Hook Functions 37
?
Limitations on the Implementation of Idle Task Hook Functions 38
?
?