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<div class="title">System Configuration Files system_&lt;device&gt;.c and system_&lt;device&gt;.h </div>  </div>
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<div class="textblock"><p>The <a class="el" href="system_c_pg.html">System Configuration Files system_&lt;device&gt;.c and system_&lt;device&gt;.h</a> provides as a minimum the functions described under <a class="el" href="group__system__init__gr.html">System and Clock Configuration</a>. These functions are device specific and need adaptations. In addition, the file might have configuration settings for the device such as XTAL frequency or PLL prescaler settings.</p>
<p>For devices with external memory BUS the system_&lt;device&gt;.c also configures the BUS system.</p>
<p>The silicon vendor might expose other functions (i.e. for power configuration) in the system_&lt;device&gt;.c file. In case of additional features the function prototypes need to be added to the system_&lt;device&gt;.h header file.</p>
<h1><a class="anchor" id="system_Device_sec"></a>
system_Device.c Template File</h1>
<p>The <a class="el" href="system_c_pg.html#system_Device_sec">system_Device.c Template File</a> for the Cortex-M3 is shown below.</p>
<pre class="fragment">/******************************************************************************
 * @file     system_&lt;Device&gt;.c
 * @brief    CMSIS Cortex-A Device Peripheral Access Layer 
 * @version  V1.00
 * @date     10. January 2018
 ******************************************************************************/
/*
 * Copyright (c) 2009-2018 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;stdint.h&gt;
#include "&lt;Device&gt;.h" /* ToDo: replace '&lt;Device&gt;' with your device name */
#include "irq_ctrl.h"

/*----------------------------------------------------------------------------
  Define clocks
 *----------------------------------------------------------------------------*/
/* ToDo: add here your necessary defines for device initialization
         following is an example for different system frequencies */
#define XTAL            (12000000U)       /* Oscillator frequency             */

#define SYSTEM_CLOCK    (5 * XTAL)


/*----------------------------------------------------------------------------
  System Core Clock Variable
 *----------------------------------------------------------------------------*/
/* ToDo: initialize SystemCoreClock with the system core clock frequency value
         achieved after system intitialization.
         This means system core clock frequency after call to SystemInit() */
uint32_t SystemCoreClock = SYSTEM_CLOCK;  /* System Clock Frequency (Core Clock)*/


/*----------------------------------------------------------------------------
  Clock functions
 *----------------------------------------------------------------------------*/

void SystemCoreClockUpdate (void)            /* Get Core Clock Frequency      */
{
/* ToDo: add code to calculate the system frequency based upon the current
         register settings.
         This function can be used to retrieve the system core clock frequeny
         after user changed register sittings. */
  SystemCoreClock = SYSTEM_CLOCK;
}


/*----------------------------------------------------------------------------
  System Initialization
 *----------------------------------------------------------------------------*/
void SystemInit (void)
{
/* ToDo: add code to initialize the system
   Do not use global variables because this function is called before
   reaching pre-main. RW section may be overwritten afterwards.          */
  SystemCoreClock = SYSTEM_CLOCK;

  // Invalidate entire Unified TLB
  __set_TLBIALL(0);

  // Invalidate entire branch predictor array
  __set_BPIALL(0);
  __DSB();
  __ISB();

  //  Invalidate instruction cache and flush branch target cache
  __set_ICIALLU(0);
  __DSB();
  __ISB();

  //  Invalidate data cache
  L1C_InvalidateDCacheAll();
  
  // Create Translation Table
  MMU_CreateTranslationTable();

  // Enable MMU
  MMU_Enable();

  // Enable Caches
  L1C_EnableCaches();
  L1C_EnableBTAC();

#if (__L2C_PRESENT == 1) 
  // Enable GIC
  L2C_Enable();
#endif

#if ((__FPU_PRESENT == 1) &amp;&amp; (__FPU_USED == 1))
  // Enable FPU
  __FPU_Enable();
#endif

  // IRQ Initialize
  IRQ_Initialize();
}
</pre><h1><a class="anchor" id="system_Device_h_sec"></a>
system_Device.h Template File</h1>
<p>The system_&lt;device&gt;.h header file contains prototypes to access the public functions in the system_&lt;device&gt;.c file. The <a class="el" href="system_c_pg.html#system_Device_h_sec">system_Device.h Template File</a> is shown below.</p>
<pre class="fragment">/**************************************************************************//**
 * @file     system_&lt;Device&gt;.h
 * @brief    CMSIS Cortex-A Device Peripheral Access Layer
 * @version  V5.00
 * @date     10. January 2018
 ******************************************************************************/
/*
 * Copyright (c) 2009-2018 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.
 */

#ifndef SYSTEM_&lt;Device&gt;_H   /* ToDo: replace '&lt;Device&gt;' with your device name */
#define SYSTEM_&lt;Device&gt;_H

#ifdef __cplusplus
extern "C" {
#endif

#include &lt;stdint.h&gt;

extern uint32_t SystemCoreClock;     /*!&lt; System Clock Frequency (Core Clock)  */

/**
  \brief Setup the microcontroller system.

   Initialize the System and update the SystemCoreClock variable.
 */
extern void SystemInit (void);

/**
  \brief  Update SystemCoreClock variable.

   Updates the SystemCoreClock with current core Clock retrieved from cpu registers.
 */
extern void SystemCoreClockUpdate (void);

/**
  \brief  Create Translation Table.

   Creates Memory Management Unit Translation Table.
 */
extern void MMU_CreateTranslationTable(void);

#ifdef __cplusplus
}
#endif

#endif /* SYSTEM_&lt;Device&gt;_H */
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