begriffs open source - cmsis/blob - CMSIS/Documentation/Core/html/using_CMSIS.html

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   7 <title>CMSIS-CORE: Basic CMSIS Example</title>
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  34    <div id="projectname">CMSIS-CORE
  35    &#160;<span id="projectnumber">Version 5.0.0 - Beta</span>
  36    </div>
  37    <div id="projectbrief">CMSIS-CORE support for Cortex-M processor-based devices</div>
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 111 <div class="title">Basic CMSIS Example </div>  </div>
 112 </div><!--header-->
 113 <div class="contents">
 114 <div class="textblock"><p>A typical example for using the CMSIS layer is provided below. The example is based on a STM32F10x Device.</p>
 115 <div class="fragment"><div class="line"><span class="preprocessor">#include &lt;stm32f10x.h&gt;</span>                           <span class="comment">// File name depends on device used</span></div>
 116 <div class="line"> </div>
 117 <div class="line">uint32_t <span class="keyword">volatile</span> msTicks;                       <span class="comment">// Counter for millisecond Interval</span></div>
 118 <div class="line"> </div>
 119 <div class="line"><span class="keywordtype">void</span> SysTick_Handler (<span class="keywordtype">void</span>) {                    <span class="comment">// SysTick Interrupt Handler</span></div>
 120 <div class="line">  msTicks++;                                     <span class="comment">// Increment Counter</span></div>
 121 <div class="line">}</div>
 122 <div class="line"> </div>
 123 <div class="line"><span class="keywordtype">void</span> WaitForTick (<span class="keywordtype">void</span>)  {</div>
 124 <div class="line">  uint32_t curTicks;</div>
 125 <div class="line"> </div>
 126 <div class="line">  curTicks = msTicks;                            <span class="comment">// Save Current SysTick Value</span></div>
 127 <div class="line">  <span class="keywordflow">while</span> (msTicks == curTicks)  {                 <span class="comment">// Wait for next SysTick Interrupt</span></div>
 128 <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>
 129 <div class="line">  }</div>
 130 <div class="line">}</div>
 131 <div class="line"> </div>
 132 <div class="line"><span class="keywordtype">void</span> TIM1_UP_IRQHandler (<span class="keywordtype">void</span>) {                 <span class="comment">// Timer Interrupt Handler</span></div>
 133 <div class="line">  ;                                              <span class="comment">// Add user code here</span></div>
 134 <div class="line">}</div>
 135 <div class="line"> </div>
 136 <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>
 137 <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>
 138 <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>
 139 <div class="line">}</div>
 140 <div class="line"> </div>
 141 <div class="line"> </div>
 142 <div class="line"><span class="keywordtype">void</span> Device_Initialization (<span class="keywordtype">void</span>)  {             <span class="comment">// Configure &amp; Initialize MCU</span></div>
 143 <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>
 144 <div class="line">       : <span class="comment">// Handle Error </span></div>
 145 <div class="line">  }</div>
 146 <div class="line">  timer1_init ();                                <span class="comment">// setup device-specific timer</span></div>
 147 <div class="line">}</div>
 148 <div class="line"> </div>
 149 <div class="line"> </div>
 150 <div class="line"><span class="comment">// The processor clock is initialized by CMSIS startup + system file</span></div>
 151 <div class="line"><span class="keywordtype">void</span> main (<span class="keywordtype">void</span>) {                                   <span class="comment">// user application starts here</span></div>
 152 <div class="line">  Device_Initialization ();                      <span class="comment">// Configure &amp; Initialize MCU</span></div>
 153 <div class="line">  <span class="keywordflow">while</span> (1)  {                                   <span class="comment">// Endless Loop (the Super-Loop)</span></div>
 154 <div class="line">    <a class="code" href="group__Core__Register__gr.html#gaeb8e5f7564a8ea23678fe3c987b04013">__disable_irq</a> ();                            <span class="comment">// Disable all interrupts</span></div>
 155 <div class="line">    Get_InputValues ();                          <span class="comment">// Read Values</span></div>
 156 <div class="line">    <a class="code" href="group__Core__Register__gr.html#ga0f98dfbd252b89d12564472dbeba9c27">__enable_irq</a> ();                             <span class="comment">// Enable all interrupts </span></div>
 157 <div class="line">    Calculation_Response ();                     <span class="comment">// Calculate Results</span></div>
 158 <div class="line">    Output_Response ();                          <span class="comment">// Output Results</span></div>
 159 <div class="line">    WaitForTick ();                              <span class="comment">// Synchronize to SysTick Timer</span></div>
 160 <div class="line">  }</div>
 161 <div class="line">}</div>
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