Files
@ 910a3533e103
Branch filter:
Location: therm/Libraries/CMSIS/Documentation/Core/html/_using_pg.html
910a3533e103
17.1 KiB
text/html
Strip out random crap
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | <!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>CMSIS-CORE: Using CMSIS in Embedded Applications</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>
<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>
<link href="stylsheetf" rel="stylesheet" type="text/css" />
</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-CORE
 <span id="projectnumber">Version 3.20</span>
</div>
<div id="projectbrief">CMSIS-CORE support for Cortex-M processor-based devices</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<div id="CMSISnav" class="tabs1">
<ul class="tablist">
<li><a href="../../General/html/index.html"><span>CMSIS</span></a></li>
<li class="current"><a href="../../Core/html/index.html"><span>CORE</span></a></li>
<li><a href="../../DSP/html/index.html"><span>DSP</span></a></li>
<li><a href="../../RTOS/html/index.html"><span>RTOS API</span></a></li>
<li><a href="../../SVD/html/index.html"><span>SVD</span></a></li>
</ul>
</div>
<!-- Generated by Doxygen 1.8.3.1 -->
<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('_using_pg.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>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><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">Using CMSIS in Embedded Applications </div> </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><p>To use the CMSIS-CORE the following files are added to the embedded application:</p>
<ul>
<li><a class="el" href="startup_s_pg.html">Startup File startup_<device>.s</a> with reset handler and exception vectors.</li>
<li><a class="el" href="system_c_pg.html">System Configuration Files system_<device>.c and system_<device>.h</a> with general device configuration (i.e. for clock and BUS setup).</li>
<li><a class="el" href="device_h_pg.html">Device Header File <device.h></a> gives access to processor core and all peripherals.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>The files <a class="el" href="startup_s_pg.html">Startup File startup_<device>.s</a> and <a class="el" href="system_c_pg.html">System Configuration Files system_<device>.c and system_<device>.h</a> may require application specific adaptations and therefore should be copied into the application project folder prior configuration. The <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is included in all source files that need device access and can be stored on a central include folder that is generic for all projects.</dd></dl>
<p>The <a class="el" href="startup_s_pg.html">Startup File startup_<device>.s</a> is executed after reset and calls <a class="el" href="group__system__init__gr.html#ga93f514700ccf00d08dbdcff7f1224eb2">SystemInit</a>. After the system initialization control is transferred to the C/C++ run-time library which performs initialization and calls the <b>main</b> function in the user code. In addition the <a class="el" href="startup_s_pg.html">Startup File startup_<device>.s</a> contains all exception and interrupt vectors and implements a default function for every interrupt. It may also contain stack and heap configurations for the user application.</p>
<p>The <a class="el" href="system_c_pg.html">System Configuration Files system_<device>.c and system_<device>.h</a> performs the setup for the processor clock. The variable <a class="el" href="group__system__init__gr.html#gaa3cd3e43291e81e795d642b79b6088e6">SystemCoreClock</a> indicates the CPU clock speed. <a class="el" href="group__system__init__gr.html">System and Clock Configuration</a> describes the minimum feature set. In addition the file may contain functions for the memory BUS setup and clock re-configuration.</p>
<p>The <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is the central include file that the application programmer is using in the C source code. It provides the following features:</p>
<ul>
<li><a class="el" href="group__peripheral__gr.html">Peripheral Access</a> provides a standardized register layout for all peripherals. Optionally functions for device-specific peripherals may be available.</li>
<li><a class="el" href="group___n_v_i_c__gr.html">Interrupts and Exceptions (NVIC)</a> can be accessed with standardized symbols and functions for the Nested Interrupt Vector Controller (NVIC) are provided.</li>
<li><a class="el" href="group__intrinsic___c_p_u__gr.html">Intrinsic Functions for CPU Instructions</a> allow to access special instructions, for example for activating sleep mode or the NOP instruction.</li>
<li><a class="el" href="group__intrinsic___s_i_m_d__gr.html">Intrinsic Functions for SIMD Instructions [only Cortex-M4]</a> provide access to the DSP-oriented instructions.</li>
<li><a class="el" href="group___sys_tick__gr.html">Systick Timer (SYSTICK)</a> function to configure and start a periodic timer interrupt.</li>
<li><a class="el" href="group___i_t_m___debug__gr.html">Debug Access</a> are functions that allow printf-style I/O via the CoreSight Debug Unit and ITM communication.</li>
</ul>
<div class="image">
<img src="CMSIS_CORE_Files_user.png" alt="CMSIS_CORE_Files_user.png"/>
<div class="caption">
CMSIS-CORE User Files</div></div>
<p> The CMSIS-CORE are device specific. In addition, the <a class="el" href="startup_s_pg.html">Startup File startup_<device>.s</a> is also compiler vendor specific. The various compiler vendor tool chains may provide folders that contain the CMSIS files for each supported device. <a class="el" href="_using__a_r_m_pg.html">Using CMSIS with generic ARM Processors</a> explains how to use CMSIS-CORE for ARM processors.</p>
<p>For example, the following files are provided in MDK-ARM to support the STM32F10x Connectivity Line device variants:</p>
<table class="cmtable">
<tr>
<th>File </th><th>Description </th></tr>
<tr>
<td>".\ARM\Startup\ST\STM32F10x\startup_stm32f10x_cl.s" </td><td><a class="el" href="startup_s_pg.html">Startup File startup_<device>.s</a> for the STM32F10x Connectivity Line device variants. </td></tr>
<tr>
<td>".\ARM\Startup\ST\STM32F10x\system_stmf10x.c" </td><td><a class="el" href="system_c_pg.html">System Configuration Files system_<device>.c and system_<device>.h</a> for the STM32F10x device families. </td></tr>
<tr>
<td>".\ARM\INC\ST\STM32F10x\stm32f10x.h" </td><td><a class="el" href="device_h_pg.html">Device Header File <device.h></a> for the STM32F10x device families. </td></tr>
<tr>
<td>".\ARM\INC\ST\STM32F10x\system_stm32f10x.h" </td><td><a class="el" href="system_c_pg.html#system_Device_h_sec">system_Device.h Template File</a> for the STM32F10x device families. </td></tr>
</table>
<dl class="section note"><dt>Note</dt><dd>The silicon vendors create these device-specific CMSIS-CORE files based on <a class="el" href="_templates_pg.html">Template Files</a> provide by ARM.</dd></dl>
<p>Thereafter, the functions described under <a href="Modules.html"><b>Reference</b> </a> can be used in the application.</p>
<p>A typical example for using the CMSIS layer is provided below. The example is based on a STM32F10x Device.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include <stm32f10x.h></span> <span class="comment">// File name depends on device used</span></div>
<div class="line"></div>
<div class="line">uint32_t <span class="keyword">volatile</span> msTicks; <span class="comment">// Counter for millisecond Interval</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> SysTick_Handler (<span class="keywordtype">void</span>) { <span class="comment">// SysTick Interrupt Handler</span></div>
<div class="line"> msTicks++; <span class="comment">// Increment Counter</span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> WaitForTick (<span class="keywordtype">void</span>) {</div>
<div class="line"> uint32_t curTicks;</div>
<div class="line"></div>
<div class="line"> curTicks = msTicks; <span class="comment">// Save Current SysTick Value</span></div>
<div class="line"> <span class="keywordflow">while</span> (msTicks == curTicks) { <span class="comment">// Wait for next SysTick Interrupt</span></div>
<div class="line"> <a class="code" href="group__intrinsic___c_p_u__gr.html#gad3efec76c3bfa2b8528ded530386c563" title="Wait For Event.">__WFE</a> (); <span class="comment">// Power-Down until next Event/Interrupt</span></div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> TIM1_UP_IRQHandler (<span class="keywordtype">void</span>) { <span class="comment">// Timer Interrupt Handler</span></div>
<div class="line"> ; <span class="comment">// Add user code here</span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> timer1_init(<span class="keywordtype">int</span> frequency) { <span class="comment">// Set up Timer (device specific)</span></div>
<div class="line"> <a class="code" href="group___n_v_i_c__gr.html#ga5bb7f43ad92937c039dee3d36c3c2798" title="Set the priority for an interrupt.">NVIC_SetPriority</a> (TIM1_UP_IRQn, 1); <span class="comment">// Set Timer priority</span></div>
<div class="line"> <a class="code" href="group___n_v_i_c__gr.html#ga530ad9fda2ed1c8b70e439ecfe80591f" title="Enable an external interrupt.">NVIC_EnableIRQ</a> (TIM1_UP_IRQn); <span class="comment">// Enable Timer Interrupt</span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> Device_Initialization (<span class="keywordtype">void</span>) { <span class="comment">// Configure & Initialize MCU</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="group___sys_tick__gr.html#gabe47de40e9b0ad465b752297a9d9f427" title="System Tick Timer Configuration.">SysTick_Config</a> (<a class="code" href="group__system__init__gr.html#gaa3cd3e43291e81e795d642b79b6088e6" title="Variable to hold the system core clock value.">SystemCoreClock</a> / 1000)) { <span class="comment">// SysTick 1mSec</span></div>
<div class="line"> : <span class="comment">// Handle Error </span></div>
<div class="line"> }</div>
<div class="line"> timer1_init (); <span class="comment">// setup device-specific timer</span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">// The processor clock is initialized by CMSIS startup + system file</span></div>
<div class="line"><span class="keywordtype">void</span> main (<span class="keywordtype">void</span>) { <span class="comment">// user application starts here</span></div>
<div class="line"> Device_Initialization (); <span class="comment">// Configure & Initialize MCU</span></div>
<div class="line"> <span class="keywordflow">while</span> (1) { <span class="comment">// Endless Loop (the Super-Loop)</span></div>
<div class="line"> <a class="code" href="group___core___register__gr.html#gaeb8e5f7564a8ea23678fe3c987b04013" title="Globally disables interrupts and configurable fault handlers.">__disable_irq</a> (); <span class="comment">// Disable all interrupts</span></div>
<div class="line"> Get_InputValues (); <span class="comment">// Read Values</span></div>
<div class="line"> <a class="code" href="group___core___register__gr.html#ga0f98dfbd252b89d12564472dbeba9c27" title="Globally enables interrupts and configurable fault handlers.">__enable_irq</a> (); <span class="comment">// Enable all interrupts </span></div>
<div class="line"> Calculation_Response (); <span class="comment">// Calculate Results</span></div>
<div class="line"> Output_Response (); <span class="comment">// Output Results</span></div>
<div class="line"> WaitForTick (); <span class="comment">// Synchronize to SysTick Timer</span></div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment --> </div></div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="footer">Generated on Mon Mar 18 2013 13:37:41 for CMSIS-CORE by ARM Ltd. All rights reserved.
<!--
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.3.1
-->
</li>
</ul>
</div>
</body>
</html>
|