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

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 126 <div><div class="header">
 127   <div class="headertitle"><div class="title">Startup File startup_&lt;device&gt;.c </div></div>
 128 </div><!--header-->
 129 <div class="contents">
 130 <div class="textblock"><p>The <a class="el" href="startup_c_pg.html">Startup File startup_&lt;device&gt;.c</a> contains:</p><ul>
 131 <li>The reset handler which is executed after CPU reset and typically calls the <a class="el" href="group__system__init__gr.html#ga93f514700ccf00d08dbdcff7f1224eb2">SystemInit</a> function.</li>
 132 <li>The setup values for the Main Stack Pointer (MSP).</li>
 133 <li>Exception vectors of the Cortex-M Processor with weak functions that implement default routines.</li>
 134 <li>Interrupt vectors that are device specific with weak functions that implement default routines.</li>
 135 </ul>
 136 <p>The file exists for each supported toolchain and is the only tool-chain specific CMSIS file.</p>
 137 <p>To adapt the file to a new device only the interrupt vector table needs to be extended with the device-specific interrupt handlers. The naming convention for the interrupt handler names are &lt;interrupt_name&gt;_IRQHandler. This table needs to be consistent with <a class="el" href="group__NVIC__gr.html#ga7e1129cd8a196f4284d41db3e82ad5c8">IRQn_Type</a> that defines all the IRQ numbers for each interrupt.</p>
 138 <p><b>Example:</b> </p>
 139 <p>The following example shows the extension of the interrupt vector table for the LPC1100 device family.</p>
 140 <div class="fragment"><div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
 141 <div class="line"><span class="comment">  Exception / Interrupt Handler</span></div>
 142 <div class="line"><span class="comment"> *----------------------------------------------------------------------------*/</span></div>
 143 <div class="line"><span class="comment">/* Exceptions */</span></div>
 144 <div class="line"><span class="keywordtype">void</span> WAKEUP0_IRQHandler     (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(<span class="stringliteral">&quot;Default_Handler&quot;</span>)));</div>
 145 <div class="line"><span class="keywordtype">void</span> WAKEUP1_IRQHandler     (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(<span class="stringliteral">&quot;Default_Handler&quot;</span>)));</div>
 146 <div class="line"><span class="keywordtype">void</span> WAKEUP2_IRQHandler     (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(<span class="stringliteral">&quot;Default_Handler&quot;</span>)));</div>
 147 <div class="line"><span class="comment">// :</span></div>
 148 <div class="line"><span class="comment">// :</span></div>
 149 <div class="line"><span class="keywordtype">void</span> EINT1_IRQHandler       (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(<span class="stringliteral">&quot;Default_Handler&quot;</span>)));</div>
 150 <div class="line"><span class="keywordtype">void</span> EINT2_IRQHandler       (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(<span class="stringliteral">&quot;Default_Handler&quot;</span>)));</div>
 151 <div class="line"><span class="comment">// :</span></div>
 152 <div class="line"><span class="comment">// :</span></div>
 153 <div class="line"> </div>
 154 <div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
 155 <div class="line"><span class="comment">  Exception / Interrupt Vector table</span></div>
 156 <div class="line"><span class="comment"> *----------------------------------------------------------------------------*/</span></div>
 157 <div class="line"><span class="keyword">extern</span> <span class="keyword">const</span> pFunc <a class="code hl_define" href="group__compiler__conntrol__gr.html#gab94ebeb20055f1848d7b707d3c7cfc5d">__VECTOR_TABLE</a>[240];</div>
 158 <div class="line">       <span class="keyword">const</span> pFunc <a class="code hl_define" href="group__compiler__conntrol__gr.html#gab94ebeb20055f1848d7b707d3c7cfc5d">__VECTOR_TABLE</a>[240] <a class="code hl_define" href="group__compiler__conntrol__gr.html#ga4f65c96effa79fbd610fea43ee7d745b">__VECTOR_TABLE_ATTRIBUTE</a> = {</div>
 159 <div class="line">  (pFunc)(&amp;<a class="code hl_define" href="group__compiler__conntrol__gr.html#ga1002e751427b1189f92787d4e4eef965">__INITIAL_SP</a>),                   <span class="comment">/*     Initial Stack Pointer */</span></div>
 160 <div class="line">  Reset_Handler,                            <span class="comment">/*     Reset Handler */</span></div>
 161 <div class="line">  NMI_Handler,                              <span class="comment">/* -14 NMI Handler */</span></div>
 162 <div class="line">  HardFault_Handler,                        <span class="comment">/* -13 Hard Fault Handler */</span></div>
 163 <div class="line">  MemManage_Handler,                        <span class="comment">/* -12 MPU Fault Handler */</span></div>
 164 <div class="line">  BusFault_Handler,                         <span class="comment">/* -11 Bus Fault Handler */</span></div>
 165 <div class="line">  UsageFault_Handler,                       <span class="comment">/* -10 Usage Fault Handler */</span></div>
 166 <div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
 167 <div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
 168 <div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
 169 <div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
 170 <div class="line">  SVC_Handler,                              <span class="comment">/*  -5 SVC Handler */</span></div>
 171 <div class="line">  DebugMon_Handler,                         <span class="comment">/*  -4 Debug Monitor Handler */</span></div>
 172 <div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
 173 <div class="line">  PendSV_Handler,                           <span class="comment">/*  -2 PendSV Handler */</span></div>
 174 <div class="line">  SysTick_Handler,                          <span class="comment">/*  -1 SysTick Handler */</span></div>
 175 <div class="line"> </div>
 176 <div class="line">  <span class="comment">/* Interrupts */</span></div>
 177 <div class="line">  WAKEUP0_IRQHandler,                       <span class="comment">/*   0 Wakeup PIO0.0 */</span></div>
 178 <div class="line">  WAKEUP1_IRQHandler,                       <span class="comment">/*   1 Wakeup PIO0.1 */</span></div>
 179 <div class="line">  WAKEUP2_IRQHandler,                       <span class="comment">/*   2 Wakeup PIO0.2 */</span></div>
 180 <div class="line">  <span class="comment">// :</span></div>
 181 <div class="line">  <span class="comment">// :</span></div>
 182 <div class="line">  EINT1_IRQHandler,                         <span class="comment">/*  30 PIO INT1 */</span></div>
 183 <div class="line">  EINT2_IRQHandler,                         <span class="comment">/*  31 PIO INT2 */</span></div>
 184 <div class="line">  <span class="comment">// :</span></div>
 185 <div class="line">  <span class="comment">// :</span></div>
 186 <div class="line">};</div>
 187 <div class="ttc" id="agroup__compiler__conntrol__gr_html_ga1002e751427b1189f92787d4e4eef965"><div class="ttname"><a href="group__compiler__conntrol__gr.html#ga1002e751427b1189f92787d4e4eef965">__INITIAL_SP</a></div><div class="ttdeci">#define __INITIAL_SP</div><div class="ttdoc">Compiler/linker symbol specifying the location of the main stack (MSP).</div><div class="ttdef"><b>Definition:</b> Ref_CompilerControl.txt:495</div></div>
 188 <div class="ttc" id="agroup__compiler__conntrol__gr_html_ga4f65c96effa79fbd610fea43ee7d745b"><div class="ttname"><a href="group__compiler__conntrol__gr.html#ga4f65c96effa79fbd610fea43ee7d745b">__VECTOR_TABLE_ATTRIBUTE</a></div><div class="ttdeci">#define __VECTOR_TABLE_ATTRIBUTE</div><div class="ttdoc">Additional decl specs to be used when defining the (static) interrupt vector table.</div><div class="ttdef"><b>Definition:</b> Ref_CompilerControl.txt:544</div></div>
 189 <div class="ttc" id="agroup__compiler__conntrol__gr_html_gab94ebeb20055f1848d7b707d3c7cfc5d"><div class="ttname"><a href="group__compiler__conntrol__gr.html#gab94ebeb20055f1848d7b707d3c7cfc5d">__VECTOR_TABLE</a></div><div class="ttdeci">#define __VECTOR_TABLE</div><div class="ttdoc">Symbol name used for the (static) interrupt vector table.</div><div class="ttdef"><b>Definition:</b> Ref_CompilerControl.txt:531</div></div>
 190 </div><!-- fragment --><h1><a class="anchor" id="startup_c_sec"></a>
 191 startup_Device.c Template File</h1>
 192 <p>A compiler agnostic <a class="el" href="startup_c_pg.html#startup_c_sec">startup_Device.c Template File</a> for an Armv7-M processor like Cortex-M3 is shown below. The C startup file relys on certain compiler specific preprocessor defines specified in CMSIS compiler headers:</p><ul>
 193 <li><a class="el" href="group__compiler__conntrol__gr.html#ga1002e751427b1189f92787d4e4eef965">__INITIAL_SP</a></li>
 194 <li><a class="el" href="group__compiler__conntrol__gr.html#ga84b0bad4aa39632d3faea46aa1e102a8">__STACK_LIMIT</a></li>
 195 <li><a class="el" href="group__compiler__conntrol__gr.html#ga72db8b026c5e100254080fefabd9fd88">__PROGRAM_START</a></li>
 196 <li><a class="el" href="group__compiler__conntrol__gr.html#gab94ebeb20055f1848d7b707d3c7cfc5d">__VECTOR_TABLE</a></li>
 197 <li><a class="el" href="group__compiler__conntrol__gr.html#ga4f65c96effa79fbd610fea43ee7d745b">__VECTOR_TABLE_ATTRIBUTE</a></li>
 198 </ul>
 199 <pre class="fragment"></pre> <h1><a class="anchor" id="startup_c_sec_v8"></a>
 200 startup_Device.c Template File (Armv8-M/v8.1-M)</h1>
 201 <p>The C-startup file for an Armv8-M/v8.1-M processor is similar to the one for an Armv7-M processor except that it offers the possibility of stack sealing for the Main Stack Pointer (MSP). The following preprocessor defines and CMSIS functions are used:</p><ul>
 202 <li><a class="el" href="group__stacksealing__support__trustzone__functions.html#gacc36ddac1642fe80a690364911542d79">__STACK_SEAL</a></li>
 203 <li><a class="el" href="group__stacksealing__support__trustzone__functions.html#ga87d2473a3adebb73941065366feec690">__TZ_set_STACKSEAL_S</a></li>
 204 </ul>
 205 <p>The stack sealing and the initialization fof the Stack Limit register is done in function <b>void Reset_Handler(void)</b>:</p>
 206 <div class="fragment"><div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
 207 <div class="line"><span class="comment">  Reset Handler called on controller reset</span></div>
 208 <div class="line"><span class="comment"> *----------------------------------------------------------------------------*/</span></div>
 209 <div class="line"><a class="code hl_define" href="group__compiler__conntrol__gr.html#ga153a4a31b276a9758959580538720a51">__NO_RETURN</a> <span class="keywordtype">void</span> Reset_Handler(<span class="keywordtype">void</span>)</div>
 210 <div class="line">{</div>
 211 <div class="line">  <a class="code hl_function" href="group__Core__Register__gr.html#ga48e5853f417e17a8a65080f6a605b743">__set_PSP</a>((uint32_t)(&amp;<a class="code hl_define" href="group__compiler__conntrol__gr.html#ga1002e751427b1189f92787d4e4eef965">__INITIAL_SP</a>));</div>
 212 <div class="line"> </div>
 213 <div class="line">  <a class="code hl_function" href="group__Core__Register__gr.html#ga6809a07c5cb7410e361f3fba57f72172">__set_MSPLIM</a>((uint32_t)(&amp;<a class="code hl_define" href="group__compiler__conntrol__gr.html#ga84b0bad4aa39632d3faea46aa1e102a8">__STACK_LIMIT</a>));</div>
 214 <div class="line">  <a class="code hl_function" href="group__Core__Register__gr.html#ga4348d14fc5eefbfd34ab8c51be44a81b">__set_PSPLIM</a>((uint32_t)(&amp;<a class="code hl_define" href="group__compiler__conntrol__gr.html#ga84b0bad4aa39632d3faea46aa1e102a8">__STACK_LIMIT</a>));</div>
 215 <div class="line"> </div>
 216 <div class="line"><span class="preprocessor">#if defined (__ARM_FEATURE_CMSE) &amp;&amp; (__ARM_FEATURE_CMSE == 3U)</span></div>
 217 <div class="line">  <a class="code hl_function" href="group__stacksealing__support__trustzone__functions.html#ga87d2473a3adebb73941065366feec690">__TZ_set_STACKSEAL_S</a>((uint32_t *)(&amp;<a class="code hl_define" href="group__stacksealing__support__trustzone__functions.html#gacc36ddac1642fe80a690364911542d79">__STACK_SEAL</a>));</div>
 218 <div class="line"><span class="preprocessor">#endif</span></div>
 219 <div class="line"> </div>
 220 <div class="line">  <a class="code hl_function" href="group__system__init__gr.html#ga93f514700ccf00d08dbdcff7f1224eb2">SystemInit</a>();                             <span class="comment">/* CMSIS System Initialization */</span></div>
 221 <div class="line">  <a class="code hl_define" href="group__compiler__conntrol__gr.html#ga72db8b026c5e100254080fefabd9fd88">__PROGRAM_START</a>();                        <span class="comment">/* Enter PreMain (C library entry point) */</span></div>
 222 <div class="line">}</div>
 223 <div class="ttc" id="agroup__Core__Register__gr_html_ga4348d14fc5eefbfd34ab8c51be44a81b"><div class="ttname"><a href="group__Core__Register__gr.html#ga4348d14fc5eefbfd34ab8c51be44a81b">__set_PSPLIM</a></div><div class="ttdeci">void __set_PSPLIM(uint32_t ProcStackPtrLimit)</div><div class="ttdoc">Set Process Stack Pointer Limit Devices without Armv8-M Main Extensions (i.e. Cortex-M23) lack the no...</div></div>
 224 <div class="ttc" id="agroup__Core__Register__gr_html_ga48e5853f417e17a8a65080f6a605b743"><div class="ttname"><a href="group__Core__Register__gr.html#ga48e5853f417e17a8a65080f6a605b743">__set_PSP</a></div><div class="ttdeci">void __set_PSP(uint32_t topOfProcStack)</div><div class="ttdoc">Set the PSP register.</div></div>
 225 <div class="ttc" id="agroup__Core__Register__gr_html_ga6809a07c5cb7410e361f3fba57f72172"><div class="ttname"><a href="group__Core__Register__gr.html#ga6809a07c5cb7410e361f3fba57f72172">__set_MSPLIM</a></div><div class="ttdeci">__set_MSPLIM(uint32_t MainStackPtrLimit)</div><div class="ttdoc">Set Main Stack Pointer Limit Devices without Armv8-M Main Extensions (i.e. Cortex-M23) lack the non-s...</div></div>
 226 <div class="ttc" id="agroup__compiler__conntrol__gr_html_ga153a4a31b276a9758959580538720a51"><div class="ttname"><a href="group__compiler__conntrol__gr.html#ga153a4a31b276a9758959580538720a51">__NO_RETURN</a></div><div class="ttdeci">#define __NO_RETURN</div><div class="ttdoc">Inform the compiler that a function does not return.</div><div class="ttdef"><b>Definition:</b> Ref_CompilerControl.txt:171</div></div>
 227 <div class="ttc" id="agroup__compiler__conntrol__gr_html_ga72db8b026c5e100254080fefabd9fd88"><div class="ttname"><a href="group__compiler__conntrol__gr.html#ga72db8b026c5e100254080fefabd9fd88">__PROGRAM_START</a></div><div class="ttdeci">#define __PROGRAM_START</div><div class="ttdoc">Entry function into the user application or library startup.</div><div class="ttdef"><b>Definition:</b> Ref_CompilerControl.txt:483</div></div>
 228 <div class="ttc" id="agroup__compiler__conntrol__gr_html_ga84b0bad4aa39632d3faea46aa1e102a8"><div class="ttname"><a href="group__compiler__conntrol__gr.html#ga84b0bad4aa39632d3faea46aa1e102a8">__STACK_LIMIT</a></div><div class="ttdeci">#define __STACK_LIMIT</div><div class="ttdoc">Compiler/linker symbol specifying the limit of the main stack (MSP).</div><div class="ttdef"><b>Definition:</b> Ref_CompilerControl.txt:518</div></div>
 229 <div class="ttc" id="agroup__stacksealing__support__trustzone__functions_html_ga87d2473a3adebb73941065366feec690"><div class="ttname"><a href="group__stacksealing__support__trustzone__functions.html#ga87d2473a3adebb73941065366feec690">__TZ_set_STACKSEAL_S</a></div><div class="ttdeci">void __TZ_set_STACKSEAL_S(uint32_t *stackTop)</div><div class="ttdoc">Set stack seal at given address (secure)</div></div>
 230 <div class="ttc" id="agroup__stacksealing__support__trustzone__functions_html_gacc36ddac1642fe80a690364911542d79"><div class="ttname"><a href="group__stacksealing__support__trustzone__functions.html#gacc36ddac1642fe80a690364911542d79">__STACK_SEAL</a></div><div class="ttdeci">#define __STACK_SEAL</div><div class="ttdoc">Compiler/linker symbol specifying the location of the stack seal.</div><div class="ttdef"><b>Definition:</b> Ref_Trustzone.txt:411</div></div>
 231 <div class="ttc" id="agroup__system__init__gr_html_ga93f514700ccf00d08dbdcff7f1224eb2"><div class="ttname"><a href="group__system__init__gr.html#ga93f514700ccf00d08dbdcff7f1224eb2">SystemInit</a></div><div class="ttdeci">void SystemInit(void)</div><div class="ttdoc">Function to Initialize the system.</div></div>
 232 </div><!-- fragment --><dl class="section note"><dt>Note</dt><dd>Stack Sealing also requires the application project to use a scatter file (or a linker script) as explained in <a class="el" href="using_TrustZone_pg.html#RTOS_TrustZone_stacksealing">Stack Sealing</a> section. </dd></dl>
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