begriffs open source - cmsis/blob - main/Core/html/using_CMSIS.html

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  46    <div id="projectname">CMSIS-Core (Cortex-M)
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  55    <div id="projectbrief">CMSIS-Core support for Cortex-M processor-based devices</div>
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 130   <div class="headertitle"><div class="title">Basic CMSIS Example </div></div>
 131 </div><!--header-->
 132 <div class="contents">
 133 <div class="textblock"><p>A typical example for using the CMSIS layer is provided below. The example is based on a STM32F10x Device.</p>
 134 <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>
 135 <div class="line"> </div>
 136 <div class="line">uint32_t <span class="keyword">volatile</span> msTicks;                       <span class="comment">// Counter for millisecond Interval</span></div>
 137 <div class="line"> </div>
 138 <div class="line"><span class="keywordtype">void</span> SysTick_Handler (<span class="keywordtype">void</span>) {                    <span class="comment">// SysTick Interrupt Handler</span></div>
 139 <div class="line">  msTicks++;                                     <span class="comment">// Increment Counter</span></div>
 140 <div class="line">}</div>
 141 <div class="line"> </div>
 142 <div class="line"><span class="keywordtype">void</span> WaitForTick (<span class="keywordtype">void</span>)  {</div>
 143 <div class="line">  uint32_t curTicks;</div>
 144 <div class="line"> </div>
 145 <div class="line">  curTicks = msTicks;                            <span class="comment">// Save Current SysTick Value</span></div>
 146 <div class="line">  <span class="keywordflow">while</span> (msTicks == curTicks)  {                 <span class="comment">// Wait for next SysTick Interrupt</span></div>
 147 <div class="line">    <a class="code hl_function" href="group__intrinsic__CPU__gr.html#gad3efec76c3bfa2b8528ded530386c563">__WFE</a> ();                                    <span class="comment">// Power-Down until next Event/Interrupt</span></div>
 148 <div class="line">  }</div>
 149 <div class="line">}</div>
 150 <div class="line"> </div>
 151 <div class="line"><span class="keywordtype">void</span> TIM1_UP_IRQHandler (<span class="keywordtype">void</span>) {                 <span class="comment">// Timer Interrupt Handler</span></div>
 152 <div class="line">  ;                                              <span class="comment">// Add user code here</span></div>
 153 <div class="line">}</div>
 154 <div class="line"> </div>
 155 <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>
 156 <div class="line">  <a class="code hl_function" href="group__NVIC__gr.html#ga5bb7f43ad92937c039dee3d36c3c2798">NVIC_SetPriority</a> (TIM1_UP_IRQn, 1);            <span class="comment">// Set Timer priority</span></div>
 157 <div class="line">  <a class="code hl_function" href="group__NVIC__gr.html#ga530ad9fda2ed1c8b70e439ecfe80591f">NVIC_EnableIRQ</a> (TIM1_UP_IRQn);                 <span class="comment">// Enable Timer Interrupt</span></div>
 158 <div class="line">}</div>
 159 <div class="line"> </div>
 160 <div class="line"> </div>
 161 <div class="line"><span class="keywordtype">void</span> Device_Initialization (<span class="keywordtype">void</span>)  {             <span class="comment">// Configure &amp; Initialize MCU</span></div>
 162 <div class="line">  <span class="keywordflow">if</span> (<a class="code hl_function" href="group__SysTick__gr.html#gabe47de40e9b0ad465b752297a9d9f427">SysTick_Config</a> (<a class="code hl_variable" href="group__system__init__gr.html#gaa3cd3e43291e81e795d642b79b6088e6">SystemCoreClock</a> / 1000)) { <span class="comment">// SysTick 1mSec</span></div>
 163 <div class="line">       : <span class="comment">// Handle Error </span></div>
 164 <div class="line">  }</div>
 165 <div class="line">  timer1_init ();                                <span class="comment">// setup device-specific timer</span></div>
 166 <div class="line">}</div>
 167 <div class="line"> </div>
 168 <div class="line"> </div>
 169 <div class="line"><span class="comment">// The processor clock is initialized by CMSIS startup + system file</span></div>
 170 <div class="line"><span class="keywordtype">void</span> main (<span class="keywordtype">void</span>) {                               <span class="comment">// user application starts here</span></div>
 171 <div class="line">  Device_Initialization ();                      <span class="comment">// Configure &amp; Initialize MCU</span></div>
 172 <div class="line">  <span class="keywordflow">while</span> (1)  {                                   <span class="comment">// Endless Loop (the Super-Loop)</span></div>
 173 <div class="line">    <a class="code hl_function" href="group__Core__Register__gr.html#gaeb8e5f7564a8ea23678fe3c987b04013">__disable_irq</a> ();                            <span class="comment">// Disable all interrupts</span></div>
 174 <div class="line">    Get_InputValues ();                          <span class="comment">// Read Values</span></div>
 175 <div class="line">    <a class="code hl_function" href="group__Core__Register__gr.html#ga0f98dfbd252b89d12564472dbeba9c27">__enable_irq</a> ();                             <span class="comment">// Enable all interrupts </span></div>
 176 <div class="line">    Calculation_Response ();                     <span class="comment">// Calculate Results</span></div>
 177 <div class="line">    Output_Response ();                          <span class="comment">// Output Results</span></div>
 178 <div class="line">    WaitForTick ();                              <span class="comment">// Synchronize to SysTick Timer</span></div>
 179 <div class="line">  }</div>
 180 <div class="line">}</div>
 181 <div class="ttc" id="agroup__Core__Register__gr_html_ga0f98dfbd252b89d12564472dbeba9c27"><div class="ttname"><a href="group__Core__Register__gr.html#ga0f98dfbd252b89d12564472dbeba9c27">__enable_irq</a></div><div class="ttdeci">void __enable_irq(void)</div><div class="ttdoc">Globally enables interrupts and configurable fault handlers.</div></div>
 182 <div class="ttc" id="agroup__Core__Register__gr_html_gaeb8e5f7564a8ea23678fe3c987b04013"><div class="ttname"><a href="group__Core__Register__gr.html#gaeb8e5f7564a8ea23678fe3c987b04013">__disable_irq</a></div><div class="ttdeci">void __disable_irq(void)</div><div class="ttdoc">Globally disables interrupts and configurable fault handlers.</div></div>
 183 <div class="ttc" id="agroup__NVIC__gr_html_ga530ad9fda2ed1c8b70e439ecfe80591f"><div class="ttname"><a href="group__NVIC__gr.html#ga530ad9fda2ed1c8b70e439ecfe80591f">NVIC_EnableIRQ</a></div><div class="ttdeci">void NVIC_EnableIRQ(IRQn_Type IRQn)</div><div class="ttdoc">Enable a device specific interrupt.</div></div>
 184 <div class="ttc" id="agroup__NVIC__gr_html_ga5bb7f43ad92937c039dee3d36c3c2798"><div class="ttname"><a href="group__NVIC__gr.html#ga5bb7f43ad92937c039dee3d36c3c2798">NVIC_SetPriority</a></div><div class="ttdeci">void NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)</div><div class="ttdoc">Set the priority for an interrupt.</div></div>
 185 <div class="ttc" id="agroup__SysTick__gr_html_gabe47de40e9b0ad465b752297a9d9f427"><div class="ttname"><a href="group__SysTick__gr.html#gabe47de40e9b0ad465b752297a9d9f427">SysTick_Config</a></div><div class="ttdeci">uint32_t SysTick_Config(uint32_t ticks)</div><div class="ttdoc">System Tick Timer Configuration.</div></div>
 186 <div class="ttc" id="agroup__intrinsic__CPU__gr_html_gad3efec76c3bfa2b8528ded530386c563"><div class="ttname"><a href="group__intrinsic__CPU__gr.html#gad3efec76c3bfa2b8528ded530386c563">__WFE</a></div><div class="ttdeci">void __WFE(void)</div><div class="ttdoc">Wait For Event.</div></div>
 187 <div class="ttc" id="agroup__system__init__gr_html_gaa3cd3e43291e81e795d642b79b6088e6"><div class="ttname"><a href="group__system__init__gr.html#gaa3cd3e43291e81e795d642b79b6088e6">SystemCoreClock</a></div><div class="ttdeci">uint32_t SystemCoreClock</div><div class="ttdoc">Variable to hold the system core clock value.</div><div class="ttdef"><b>Definition:</b> Ref_SystemAndClock.txt:68</div></div>
 188 </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>
 189 <div class="fragment"><div class="line"><span class="preprocessor">#include &quot;RTE_Components.h&quot;</span>                      <span class="comment">// include information about project configuration</span></div>
 190 <div class="line"><span class="preprocessor">#include CMSIS_device_header                     </span><span class="comment">// include &lt;device&gt;.h file</span></div>
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