REXIS
<!-- If the browser does not support frames put the first topic content here --> <div class="WordSection1"> <p class="MsoTitle" align="center" style='text-align:center'> <span lang="EN" xml:lang="EN">REXIS User Guide</span></p> <p class="MsoNormal" align="center" style='text-align:center'> <span lang="EN" xml:lang="EN">Version 1.1 2019/07/18</span></p> <p class="MsoNormal" align="center" style='text-align:center'> <span lang="EN" xml:lang="EN">Richard Man, <span class= "MsoHyperlink"><a href= "mailto:richard@imagecraft.com">richard@imagecraft.com</a></span></span></p> <p class="MsoNormal" align="center" style='text-align:center'> <u><span lang="EN" style='color:#1155CC' xml:lang="EN"><a href= "https://imagecraft.com/"><span style= 'color: #1155CC'>https://imagecraft.com</span></a></span></u></p> <p class="MsoNormal" align="center" style='text-align:center'> <span lang="EN" xml:lang="EN"> </span></p> <span lang="EN" style= 'font-size:11.0pt;line-height:115%;font-family:"Arial",sans-serif' xml:lang="EN"><br clear="all" style= 'page-break-before:always' /></span> <p class="MsoNormal"><span lang="EN" xml:lang= "EN"> </span></p> <span lang="EN" style= 'font-size:20.0pt;line-height:115%;font-family:"Arial",sans-serif' xml:lang="EN"><br clear="all" style= 'page-break-before:always' /></span></div>
Contents
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REXIS
Introduction
Why use REXIS
Main Features of REXIS
REXIS Hardware Requirements
Examples
Example Requirements
REXIS Startup
Simple Sleep Task / Blinking LED
Simple Reader and Writer Tasks Using Mailboxes
Peripheral Interrupt Handler and Processing Task
MUTEX Example
Detour: Using the Same Function for Different Tasks
Semaphore Example
Synchronous Message Passing Example
Watchdog Example
REXIS Design Philosophy
Use of Dynamic Memory Allocation
Kernel API
Kernel Interface
API Documentation
Multitasking Concepts
A Basic REXIS Task
Kernel vs. User Code
Preemption
Scheduler
Context-Switching
Task Priorities
Implementing Multitasking on the Cortex-M
System Ticks
Cortex-M Execution Modes and Stacks
REXIS Use of Cortex-M Exceptions
Kernel Stack
REXIS Interrupt Handler API
Tasks
Task (User) Stack
Task State
Stack Checking
Task Related API
Asynchronous Message Passing / Mailbox API
API
Synchronous Message Passing
Message Passing and the Scheduler
API
Semantics of the Message Passing Functions
Error Reply
Message Passing Sequence of Events
Server and Client Tasks
Message Buffers
Message Queuing
Message Passing API Timing
MUTEX
MUTEX API
Semaphores
Wait Operation
Signal Operation
Counting Semaphores
Difference Between a MUTEX and a Binary Semaphore
Semaphore API
The Deadlock Problem
The Priority Inversion Problem
The Pathfinder Reboot Problem
Using Priority Inheritance to Prevent Priority Inversion
Watchdog Support
Watchdog API
Memory Management
Allocator Initialization
Resource Tracking
Using GCC Memory Allocator
Memory Allocation API
Using Interrupts
Piggybacking on the SysTick Interrupt
Interrupt Safe REXIS API
Timing for ISR Task Resumption
System and Other Kernel Functions
System API
User-Provided Functions
User API
Error Conditions
(Future) Debugger Integration
Setting Up the Project to Use REXIS
Adding rexis_api.h to Source Files
Calling the REXIS Exception Handlers
Adding librexis.a to Projects
Using REXIS with JumpStart API (JSAPI)
Software License Agreement
LIMITED WARRANTY
(Future) Debugger Integration
A Basic REXIS Task
Adding librexis.a to Projects
Adding rexis_api.h to Source Files
Allocator Initialization
API
API
API Documentation
Asynchronous Message Passing / Mailbox API
Calling the REXIS Exception Handlers
Context-Switching
Cortex-M Execution Modes and Stacks
Counting Semaphores
Detour: Using the Same Function for Different Tasks
Difference Between a MUTEX and a Binary Semaphore
Error Conditions
Error Reply
Example Requirements
Examples
Implementing Multitasking on the Cortex-M
Interrupt Safe REXIS API
Introduction
Kernel API
Kernel Interface
Kernel Stack
Kernel vs. User Code
LIMITED WARRANTY
Main Features of REXIS
Memory Allocation API
Memory Management
Message Buffers
Message Passing and the Scheduler
Message Passing API Timing
Message Passing Sequence of Events
Message Queuing
Multitasking Concepts
MUTEX
MUTEX API
MUTEX Example
Peripheral Interrupt Handler and Processing Task
Piggybacking on the SysTick Interrupt
Preemption
Resource Tracking
REXIS
REXIS Design Philosophy
REXIS Hardware Requirements
REXIS Interrupt Handler API
REXIS Startup
REXIS Use of Cortex-M Exceptions
Scheduler
Semantics of the Message Passing Functions
Semaphore API
Semaphore Example
Semaphores
Server and Client Tasks
Setting Up the Project to Use REXIS
Signal Operation
Simple Reader and Writer Tasks Using Mailboxes
Simple Sleep Task / Blinking LED
Software License Agreement
Stack Checking
Synchronous Message Passing
Synchronous Message Passing Example
System and Other Kernel Functions
System API
System Ticks
Task (User) Stack
Task Priorities
Task Related API
Task State
Tasks
The Deadlock Problem
The Pathfinder Reboot Problem
The Priority Inversion Problem
Timing for ISR Task Resumption
Use of Dynamic Memory Allocation
User API
User-Provided Functions
Using GCC Memory Allocator
Using Interrupts
Using Priority Inheritance to Prevent Priority Inversion
Using REXIS with JumpStart API (JSAPI)
Wait Operation
Watchdog API
Watchdog Example
Watchdog Support
Why use REXIS
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