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<title>Basic CMSIS Example</title>
<title>CMSIS-Core (Cortex-M): Basic CMSIS Example</title>
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<div id="projectname">CMSIS-Core (Cortex-M)
 <span id="projectnumber">Version 5.3.0</span>
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<div id="projectbrief">CMSIS-Core support for Cortex-M processor-based devices</div>
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<div class="title">Basic CMSIS Example </div> </div>
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<div class="textblock"><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__CPU__gr.html#gad3efec76c3bfa2b8528ded530386c563">__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__NVIC__gr.html#ga5bb7f43ad92937c039dee3d36c3c2798">NVIC_SetPriority</a> (TIM1_UP_IRQn, 1); <span class="comment">// Set Timer priority</span></div>
<div class="line"> <a class="code" href="group__NVIC__gr.html#ga530ad9fda2ed1c8b70e439ecfe80591f">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__SysTick__gr.html#gabe47de40e9b0ad465b752297a9d9f427">SysTick_Config</a> (<a class="code" href="group__system__init__gr.html#gaa3cd3e43291e81e795d642b79b6088e6">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">__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">__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 --><p>CMSIS-Pack provides the <b>#define CMSIS_header_file</b> in <a href="../../Pack/html/pdsc_components_pg.html#RTE_Components_h"><b>RTE_Components.h</b></a> which gives you access to the <b><em>device</em>.h</b> file of a project. This allows you to generate generic software components that use the device selected in a project.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "RTE_Components.h"</span> <span class="comment">// include information about project configuration</span></div>
<div class="line"><span class="preprocessor">#include CMSIS_device_header // include <device>.h file</span></div>
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<li class="navelem"><a class="el" href="using_pg.html">Using CMSIS in Embedded Applications</a></li>
<li class="footer">Generated on Wed Jul 10 2019 15:20:25 for CMSIS-Core (Cortex-M) Version 5.3.0 by Arm Ltd. All rights reserved.
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