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<title>CMSIS-Core (Cortex-M): Startup File startup_&lt;device&gt;.c</title>
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   <div id="projectname">CMSIS-Core (Cortex-M)
   &#160;<span id="projectnumber">Version 5.4.0</span>
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<div class="title">Startup File startup_&lt;device&gt;.c </div>  </div>
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<div class="textblock"><p>The <a class="el" href="startup_c_pg.html">Startup File startup_&lt;device&gt;.c</a> contains:</p>
<ul>
<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>
<li>The setup values for the Main Stack Pointer (MSP).</li>
<li>Exception vectors of the Cortex-M Processor with weak functions that implement default routines.</li>
<li>Interrupt vectors that are device specific with weak functions that implement default routines.</li>
</ul>
<p>The file exists for each supported toolchain and is the only tool-chain specific CMSIS file.</p>
<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>
<p><b>Example:</b> </p>
<p>The following example shows the extension of the interrupt vector table for the LPC1100 device family.</p>
<div class="fragment"><div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">  Exception / Interrupt Handler</span></div>
<div class="line"><span class="comment"> *----------------------------------------------------------------------------*/</span></div>
<div class="line"><span class="comment">/* Exceptions */</span></div>
<div class="line"><span class="keywordtype">void</span> WAKEUP0_IRQHandler     (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(&quot;Default_Handler&quot;)));</div>
<div class="line"><span class="keywordtype">void</span> WAKEUP1_IRQHandler     (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(&quot;Default_Handler&quot;)));</div>
<div class="line"><span class="keywordtype">void</span> WAKEUP2_IRQHandler     (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(&quot;Default_Handler&quot;)));</div>
<div class="line"><span class="comment">// :</span></div>
<div class="line"><span class="comment">// :</span></div>
<div class="line"><span class="keywordtype">void</span> EINT1_IRQHandler       (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(&quot;Default_Handler&quot;)));</div>
<div class="line"><span class="keywordtype">void</span> EINT2_IRQHandler       (<span class="keywordtype">void</span>) __attribute__ ((weak, alias(&quot;Default_Handler&quot;)));</div>
<div class="line"><span class="comment">// :</span></div>
<div class="line"><span class="comment">// :</span></div>
<div class="line"></div>
<div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
<div class="line"><span class="comment">  Exception / Interrupt Vector table</span></div>
<div class="line"><span class="comment"> *----------------------------------------------------------------------------*/</span></div>
<div class="line">extern const pFunc __VECTOR_TABLE[240];</div>
<div class="line">       const pFunc __VECTOR_TABLE[240] <a class="code" href="group__compiler__conntrol__gr.html#ga4f65c96effa79fbd610fea43ee7d745b">__VECTOR_TABLE_ATTRIBUTE</a> = {</div>
<div class="line">  (pFunc)(&amp;<a class="code" href="group__compiler__conntrol__gr.html#ga1002e751427b1189f92787d4e4eef965">__INITIAL_SP</a>),                   <span class="comment">/*     Initial Stack Pointer */</span></div>
<div class="line">  Reset_Handler,                            <span class="comment">/*     Reset Handler */</span></div>
<div class="line">  NMI_Handler,                              <span class="comment">/* -14 NMI Handler */</span></div>
<div class="line">  HardFault_Handler,                        <span class="comment">/* -13 Hard Fault Handler */</span></div>
<div class="line">  MemManage_Handler,                        <span class="comment">/* -12 MPU Fault Handler */</span></div>
<div class="line">  BusFault_Handler,                         <span class="comment">/* -11 Bus Fault Handler */</span></div>
<div class="line">  UsageFault_Handler,                       <span class="comment">/* -10 Usage Fault Handler */</span></div>
<div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
<div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
<div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
<div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
<div class="line">  SVC_Handler,                              <span class="comment">/*  -5 SVCall Handler */</span></div>
<div class="line">  DebugMon_Handler,                         <span class="comment">/*  -4 Debug Monitor Handler */</span></div>
<div class="line">  0,                                        <span class="comment">/*     Reserved */</span></div>
<div class="line">  PendSV_Handler,                           <span class="comment">/*  -2 PendSV Handler */</span></div>
<div class="line">  SysTick_Handler,                          <span class="comment">/*  -1 SysTick Handler */</span></div>
<div class="line"></div>
<div class="line">  <span class="comment">/* Interrupts */</span></div>
<div class="line">  WAKEUP0_IRQHandler,                       <span class="comment">/*   0 Wakeup PIO0.0 */</span></div>
<div class="line">  WAKEUP1_IRQHandler,                       <span class="comment">/*   1 Wakeup PIO0.1 */</span></div>
<div class="line">  WAKEUP2_IRQHandler,                       <span class="comment">/*   2 Wakeup PIO0.2 */</span></div>
<div class="line">  <span class="comment">// :</span></div>
<div class="line">  <span class="comment">// :</span></div>
<div class="line">  EINT1_IRQHandler,                         <span class="comment">/*  30 PIO INT1 */</span></div>
<div class="line">  EINT2_IRQHandler,                         <span class="comment">/*  31 PIO INT2 */</span></div>
<div class="line">  <span class="comment">// :</span></div>
<div class="line">  <span class="comment">// :</span></div>
<div class="line">};</div>
</div><!-- fragment --><h1><a class="anchor" id="startup_c_sec"></a>
startup_Device.c Template File</h1>
<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>
<li><a class="el" href="group__compiler__conntrol__gr.html#ga1002e751427b1189f92787d4e4eef965">__INITIAL_SP</a></li>
<li><a class="el" href="group__compiler__conntrol__gr.html#ga84b0bad4aa39632d3faea46aa1e102a8">__STACK_LIMIT</a></li>
<li><a class="el" href="group__compiler__conntrol__gr.html#ga72db8b026c5e100254080fefabd9fd88">__PROGRAM_START</a></li>
<li><a class="el" href="group__compiler__conntrol__gr.html#gab94ebeb20055f1848d7b707d3c7cfc5d">__VECTOR_TABLE</a></li>
<li><a class="el" href="group__compiler__conntrol__gr.html#ga4f65c96effa79fbd610fea43ee7d745b">__VECTOR_TABLE_ATTRIBUTE</a></li>
</ul>
<pre class="fragment">/******************************************************************************
 * @file     startup_Device.c
 * @brief    CMSIS-Core(M) Device Startup File for &lt;Device&gt;
 * @version  V2.0.0
 * @date     20. May 2019
 ******************************************************************************/
/*
 * Copyright (c) 2009-2019 Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "&lt;Device&gt;.h"

/*----------------------------------------------------------------------------
  Exception / Interrupt Handler Function Prototype
 *----------------------------------------------------------------------------*/
typedef void( *pFunc )( void );

/*----------------------------------------------------------------------------
  External References
 *----------------------------------------------------------------------------*/
extern uint32_t __INITIAL_SP;

extern __NO_RETURN void __PROGRAM_START(void);

/*----------------------------------------------------------------------------
  Internal References
 *----------------------------------------------------------------------------*/
void __NO_RETURN Default_Handler(void);
void __NO_RETURN Reset_Handler  (void);

/*----------------------------------------------------------------------------
  Exception / Interrupt Handler
 *----------------------------------------------------------------------------*/
/* Exceptions */
void NMI_Handler            (void) __attribute__ ((weak, alias("Default_Handler")));
void HardFault_Handler      (void) __attribute__ ((weak, alias("Default_Handler")));
void MemManage_Handler      (void) __attribute__ ((weak, alias("Default_Handler")));
void BusFault_Handler       (void) __attribute__ ((weak, alias("Default_Handler")));
void UsageFault_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void SVC_Handler            (void) __attribute__ ((weak, alias("Default_Handler")));
void DebugMon_Handler       (void) __attribute__ ((weak, alias("Default_Handler")));
void PendSV_Handler         (void) __attribute__ ((weak, alias("Default_Handler")));
void SysTick_Handler        (void) __attribute__ ((weak, alias("Default_Handler")));

void Interrupt0_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt1_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt2_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt3_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt4_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt5_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt6_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt7_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt8_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));
void Interrupt9_Handler     (void) __attribute__ ((weak, alias("Default_Handler")));


/*----------------------------------------------------------------------------
  Exception / Interrupt Vector table
 *----------------------------------------------------------------------------*/
extern const pFunc __VECTOR_TABLE[240];
       const pFunc __VECTOR_TABLE[240] __VECTOR_TABLE_ATTRIBUTE = {
  (pFunc)(&amp;__INITIAL_SP),                   /*     Initial Stack Pointer */
  Reset_Handler,                            /*     Reset Handler */
  NMI_Handler,                              /* -14 NMI Handler */
  HardFault_Handler,                        /* -13 Hard Fault Handler */
  MemManage_Handler,                        /* -12 MPU Fault Handler */
  BusFault_Handler,                         /* -11 Bus Fault Handler */
  UsageFault_Handler,                       /* -10 Usage Fault Handler */
  0,                                        /*     Reserved */
  0,                                        /*     Reserved */
  0,                                        /*     Reserved */
  0,                                        /*     Reserved */
  SVC_Handler,                              /*  -5 SVCall Handler */
  DebugMon_Handler,                         /*  -4 Debug Monitor Handler */
  0,                                        /*     Reserved */
  PendSV_Handler,                           /*  -2 PendSV Handler */
  SysTick_Handler,                          /*  -1 SysTick Handler */

  /* Interrupts */
  Interrupt0_Handler,                       /*   0 Interrupt 0 */
  Interrupt1_Handler,                       /*   1 Interrupt 1 */
  Interrupt2_Handler,                       /*   2 Interrupt 2 */
  Interrupt3_Handler,                       /*   3 Interrupt 3 */
  Interrupt4_Handler,                       /*   4 Interrupt 4 */
  Interrupt5_Handler,                       /*   5 Interrupt 5 */
  Interrupt6_Handler,                       /*   6 Interrupt 6 */
  Interrupt7_Handler,                       /*   7 Interrupt 7 */
  Interrupt8_Handler,                       /*   8 Interrupt 8 */
  Interrupt9_Handler                        /*   9 Interrupt 9 */
                                            /* Interrupts 10 .. 223 are left out */
};

/*----------------------------------------------------------------------------
  Reset Handler called on controller reset
 *----------------------------------------------------------------------------*/
void Reset_Handler(void)
{
  SystemInit();                             /* CMSIS System Initialization */
  __PROGRAM_START();                        /* Enter PreMain (C library entry point) */
}

/*----------------------------------------------------------------------------
  Default Handler for Exceptions / Interrupts
 *----------------------------------------------------------------------------*/
void Default_Handler(void)
{
  while(1);
}
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