<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <title>RTX Implementation</title> <title>CMSIS-RTOS: RTX Implementation</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="cmsis.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <script type="text/javascript" src="printComponentTabs.js"></script> <link href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); $(window).load(resizeHeight); </script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 46px;"> <td id="projectlogo"><img alt="Logo" src="CMSIS_Logo_Final.png"/></td> <td style="padding-left: 0.5em;"> <div id="projectname">CMSIS-RTOS  <span id="projectnumber">Version 1.03</span> </div> <div id="projectbrief">Real-Time Operating System: API and RTX Reference Implementation.</div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <div id="CMSISnav" class="tabs1"> <ul class="tablist"> <script type="text/javascript"> <!-- writeComponentTabs.call(this); //--> </script> </ul> </div> <!-- Generated by Doxygen 1.8.6 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "search",false,'Search'); </script> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li class="current"><a href="pages.html"><span>Usage and Description</span></a></li> <li><a href="modules.html"><span>Reference</span></a></li> <li> <div id="MSearchBox" class="MSearchBoxInactive"> <span class="left"> <img id="MSearchSelect" src="search/mag_sel.png" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" alt=""/> <input type="text" id="MSearchField" value="Search" accesskey="S" onfocus="searchBox.OnSearchFieldFocus(true)" onblur="searchBox.OnSearchFieldFocus(false)" onkeyup="searchBox.OnSearchFieldChange(event)"/> </span><span class="right"> <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a> </span> </div> </li> </ul> </div> </div><!-- top --> <div id="side-nav" class="ui-resizable side-nav-resizable"> <div id="nav-tree"> <div id="nav-tree-contents"> <div id="nav-sync" class="sync"></div> </div> </div> <div id="splitbar" style="-moz-user-select:none;" class="ui-resizable-handle"> </div> </div> <script type="text/javascript"> $(document).ready(function(){initNavTree('rtxImplementation.html','');}); </script> <div id="doc-content"> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Macros</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(9)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(10)"><span class="SelectionMark"> </span>Pages</a></div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <div class="header"> <div class="headertitle"> <div class="title">RTX Implementation </div> </div> </div><!--header--> <div class="contents"> <div class="textblock"><p>This version of RTX implements the CMSIS-RTOS API, which is a generic RTOS interface for Cortex-M processor-based devices. The CMSIS-RTOS API provides a standardized interface for software components that require RTOS functionality. This RTX implementation gives therefore serious benefits to the users and the software industry.</p> <ul> <li>The unified feature set of the CMSIS-RTOS API simplifies sharing of software components and reduces learning efforts.</li> <li>Middleware components that use the CMSIS-RTOS API are RTOS agnostic and CMSIS-RTOS compliant middleware is easier to adapt.</li> <li>This RTX implementation is available under the BSD license and can be freely distributed with project templates.</li> </ul> <p>The CMSIS-RTOS RTX manages the resources of the microcontroller system and implements the concept of parallel threads that run concurrently. There are many advantages of using the CMSIS-RTOS RTX kernel.</p> <p>Applications frequently require several concurrent activities. RTX can manage multiple concurrent activities at the time when they are needed. Each activity gets a separate thread which executes a specific task and this simplifies the overall program structure. The CMSIS-RTOS RTX system is scalable and additional threads can be added easily at a later time. Threads have a priority allowing faster execution of time-critical parts of an user application.</p> <p>The CMSIS-RTOS RTX offers services needed in many real-time applications, for example, periodical activation of timer functions, memory management, and message exchange between threads with time limits.</p> <div class="image"> <img src="RTX_Structure.png" alt="RTX_Structure.png"/> <div class="caption"> CMSIS-RTOS RTX Structure</div></div> <p> Compared to the classic Keil RTX version, the CMSIS-RTOS RTX library is extended with the CMSIS API interface module (source file rt_cmsis.c) which implements the function translation. The header file <a class="el" href="cmsis__os_8h.html">cmsis_os.h</a> provides the API to the CMSIS-RTOS RTX for the user application. Refer to <a class="el" href="using.html">Create an RTX Project</a> for more information.</p> <p>CMSIS-RTOS RTX has several options that are configured with the <a class="el" href="dirstructfiles.html#RTX_Conf_CM">RTX_Conf_CM.c</a> file. Refer to <a class="el" href="configure.html">Configure RTX</a> for more information.</p> <p>Attributes of the CMSIS-RTOS RTX implementation:</p> <ul> <li>Provides the complete functions specified for a CMSIS-RTOS with the exception of the function <a class="el" href="technicalData.html#osWait">osWait</a>.</li> <li>Interrupt Service Routines (ISR) <a class="el" href="theory.html#isr_function_calls">may call some CMSIS-RTOS RTX functions</a>.</li> <li>Configurations options for Thread Stack. Refer to <a class="el" href="threadConfig.html">Thread Configuration</a> for more information.</li> <li>Fully deterministic context switching and deadlock avoidance. Refer to <a class="el" href="theory.html#PriorityInversion">Priority Inversion on Resource Sharing</a> for more information.</li> <li>Optional Round-Robin Thread switching with configurable time-slices. Refer to <a class="el" href="threadConfig.html">Thread Configuration</a> for more information.</li> </ul> <p>The following sections provide further details:</p> <ul> <li><a class="el" href="theory.html">Theory of Operation</a> : provides general information about the operation of CMSIS-RTOS RTX.</li> <li><a class="el" href="dirstructfiles.html">Directory Structure and File Overview</a> : explains the directories and files that are supplied as part of CMSIS-RTOS RTX.</li> <li><a class="el" href="technicalData.html">Technical Data</a> : lists hardware requirements and limitations such as number of concurrent threads.</li> <li><a class="el" href="misraCompliance.html">MISRA-C:2004 Compliance Exceptions</a> : describes the violations to the MISRA standard.</li> <li><a class="el" href="using.html">Create an RTX Project</a> : Provides instructions for writing and debugging applications with CMSIS-RTOS RTX.</li> <li><a class="el" href="configure.html">Configure RTX</a> : Describes configuration parameters of CMSIS-RTOS RTX.</li> <li><a class="el" href="exampleRTX_Tutorial.html">RTX Tutorial</a> : Is an in-depth tutorial that can be used with any hardware to get a better understanding of the concepts and use cases of a real-time operating system.</li> <li><a class="el" href="creating_RTX_LIB.html">Building the RTX Library</a> : Describes how to build your own CMSIS-RTOS RTX library. </li> </ul> </div></div><!-- contents --> </div><!-- doc-content --> <!-- start footer part --> <div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> <ul> <li class="navelem"><a class="el" href="index.html">index</a></li> <li class="footer">Generated on Wed Feb 8 2017 10:21:02 for CMSIS-RTOS by ARM Ltd. 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