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| <div id="projectname">CMSIS-Core (Cortex-A) |
|  <span id="projectnumber">Version 1.1.2</span> |
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| <div id="projectbrief">CMSIS-Core support for Cortex-A 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 an unspecific Cortex-A9 Device.</p> |
| <div class="fragment"><div class="line"><span class="preprocessor">#include <<a class="code" href="ARMCA9_8h.html">ARMCA9.h</a>></span> <span class="comment">// File name depends on device used</span></div> |
| <div class="line"> </div> |
| <div class="line"><span class="keyword">static</span> <span class="keyword">const</span> uint32_t TICK_RATE_HZ = 1000U;</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="keyword">static</span> <span class="keywordtype">void</span> SysTick_Handler( <span class="keywordtype">void</span> )</div> |
| <div class="line">{</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="comment">// We use the Private Tiemer (PTIM) of the Cortex-A9 FVP Model here.</span></div> |
| <div class="line"><span class="comment">// In general the available Timers are highly vendor specific for Cortex-A processors.</span></div> |
| <div class="line"><span class="keywordtype">void</span> private_timer_init(<span class="keywordtype">void</span>) {</div> |
| <div class="line"> </div> |
| <div class="line"> <a class="code" href="group__PTM__timer__functions.html#ga30516fed24977be8eecf3efd8b6a2fea">PTIM_SetLoadValue</a> ((<a class="code" href="group__system__init__gr.html#gaa3cd3e43291e81e795d642b79b6088e6">SystemCoreClock</a>/TICK_RATE_HZ) - 1U);</div> |
| <div class="line"> <a class="code" href="group__PTM__timer__functions.html#gaabc1dba029389fe0e2a6297952df7972">PTIM_SetControl</a> (<a class="code" href="group__PTM__timer__functions.html#ga34f0ceea142a4be1479cb552bf8bc4d1">PTIM_GetControl</a>() | 7U);</div> |
| <div class="line"></div> |
| <div class="line"> <span class="comment">/* Install SysTick_Handler as the interrupt function for PTIM */</span></div> |
| <div class="line"> <a class="code" href="group__irq__ctrl__gr.html#gac1fcc16fb8e488d315cfa496f1d71db3">IRQ_SetHandler</a>((<a class="code" href="irq__ctrl_8h.html#ac62964c04a7fed2c84aeea9e34f415e2">IRQn_ID_t</a>)<a class="code" href="ARMCA9_8h.html#a7e1129cd8a196f4284d41db3e82ad5c8a116d3d8a9fcc5fef99becc9d25a56249">PrivTimer_IRQn</a>, SysTick_Handler);</div> |
| <div class="line"> </div> |
| <div class="line"> <span class="comment">/* Determine number of implemented priority bits */</span></div> |
| <div class="line"> <a class="code" href="group__irq__ctrl__gr.html#gaa90aed20ac94420fff4bbbf55c12d4c2">IRQ_SetPriority</a> ((<a class="code" href="irq__ctrl_8h.html#ac62964c04a7fed2c84aeea9e34f415e2">IRQn_ID_t</a>)<a class="code" href="ARMCA9_8h.html#a7e1129cd8a196f4284d41db3e82ad5c8a116d3d8a9fcc5fef99becc9d25a56249">PrivTimer_IRQn</a>, <a class="code" href="group__irq__priority__defs.html#gabaa4e91ab84dbe5f669080af6d0d81fa">IRQ_PRIORITY_Msk</a>);</div> |
| <div class="line"> </div> |
| <div class="line"> <span class="comment">/* Set lowest priority -1 */</span></div> |
| <div class="line"> <a class="code" href="group__irq__ctrl__gr.html#gaa90aed20ac94420fff4bbbf55c12d4c2">IRQ_SetPriority</a> ((<a class="code" href="irq__ctrl_8h.html#ac62964c04a7fed2c84aeea9e34f415e2">IRQn_ID_t</a>)<a class="code" href="ARMCA9_8h.html#a7e1129cd8a196f4284d41db3e82ad5c8a116d3d8a9fcc5fef99becc9d25a56249">PrivTimer_IRQn</a>, <a class="code" href="group__GIC__functions.html#ga397048004654f792649742f95bf8ae67">GIC_GetPriority</a>((<a class="code" href="irq__ctrl_8h.html#ac62964c04a7fed2c84aeea9e34f415e2">IRQn_ID_t</a>)PrivTimer_IRQn)-1);</div> |
| <div class="line"> </div> |
| <div class="line"> <span class="comment">/* Enable IRQ */</span></div> |
| <div class="line"> <a class="code" href="group__irq__ctrl__gr.html#ga4ad780a3dc23a1b6222de8adcd7c20a7">IRQ_Enable</a> ((<a class="code" href="irq__ctrl_8h.html#ac62964c04a7fed2c84aeea9e34f415e2">IRQn_ID_t</a>)PrivTimer_IRQn);</div> |
| <div class="line">}</div> |
| <div class="line"></div> |
| <div class="line"><span class="comment">/* Delay execution for given amount of ticks */</span></div> |
| <div class="line"><span class="keywordtype">void</span> Delay(uint32_t ticks) {</div> |
| <div class="line"> uint32_t tgtTicks = msTicks + ticks; <span class="comment">// target tick count to delay execution to</span></div> |
| <div class="line"> <span class="keywordflow">while</span> (msTicks == tgtTicks) {</div> |
| <div class="line"> <a class="code" href="group__CMSIS__Core__InstructionInterface.html#gaac6cc7dd4325d9cb40d3290fa5244b3d">__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="comment">/* main function */</span></div> |
| <div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">void</span>)</div> |
| <div class="line">{</div> |
| <div class="line"> <span class="comment">/* Initialize device HAL here */</span></div> |
| <div class="line"> private_timer_init();</div> |
| <div class="line"> </div> |
| <div class="line"> <span class="keyword">static</span> uint8_t ledState = 0;</div> |
| <div class="line"> </div> |
| <div class="line"> <span class="comment">/* Infinite loop */</span></div> |
| <div class="line"> <span class="keywordflow">while</span> (1)</div> |
| <div class="line"> {</div> |
| <div class="line"> <span class="comment">/* Add application code here */</span></div> |
| <div class="line"> ledState = !ledState;</div> |
| <div class="line"> Delay(500);</div> |
| <div class="line"> }</div> |
| <div class="line">}</div> |
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