You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/**
|
|
* \file
|
|
*
|
|
* \brief Low-level initialization functions called upon chip startup.
|
|
*
|
|
* Copyright (c) 2015 Atmel Corporation. All rights reserved.
|
|
*
|
|
* \asf_license_start
|
|
*
|
|
* \page License
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* 3. The name of Atmel may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 4. This software may only be redistributed and used in connection with an
|
|
* Atmel microcontroller product.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
|
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* \asf_license_stop
|
|
*
|
|
*/
|
|
|
|
#include "samd21.h"
|
|
|
|
/**
|
|
* Initial system clock frequency. The System RC Oscillator (RCSYS) provides
|
|
* the source for the main clock at chip startup.
|
|
*/
|
|
#define __SYSTEM_CLOCK (1000000)
|
|
|
|
uint32_t SystemCoreClock = __SYSTEM_CLOCK; /*!< System Clock Frequency (Core Clock)*/
|
|
|
|
/**
|
|
* Initialize the system
|
|
*
|
|
* @brief Setup the microcontroller system.
|
|
* Initialize the System and update the SystemCoreClock variable.
|
|
*/
|
|
void SystemInit(void)
|
|
{
|
|
// Keep the default device state after reset
|
|
SystemCoreClock = __SYSTEM_CLOCK;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Update SystemCoreClock variable
|
|
*
|
|
* @brief Updates the SystemCoreClock with current core Clock
|
|
* retrieved from cpu registers.
|
|
*/
|
|
void SystemCoreClockUpdate(void)
|
|
{
|
|
// Not implemented
|
|
SystemCoreClock = __SYSTEM_CLOCK;
|
|
return;
|
|
}
|