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.
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/**
|
|
* \file
|
|
*
|
|
* \brief Low-level initialization functions called upon chip startup.
|
|
*
|
|
* Copyright (c) 2016 Atmel Corporation,
|
|
* a wholly owned subsidiary of Microchip Technology Inc.
|
|
*
|
|
* \asf_license_start
|
|
*
|
|
* \page License
|
|
*
|
|
* 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 Licence at
|
|
*
|
|
* http://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.
|
|
*
|
|
* \asf_license_stop
|
|
*
|
|
*/
|
|
|
|
#include "same54.h"
|
|
|
|
/**
|
|
* Initial system clock frequency. The System RC Oscillator (RCSYS) provides
|
|
* the source for the main clock at chip startup.
|
|
*/
|
|
#define __SYSTEM_CLOCK (48000000)
|
|
|
|
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)
|
|
{
|
|
#if __FPU_USED
|
|
/* Enable FPU */
|
|
SCB->CPACR |= (0xFu << 20);
|
|
__DSB();
|
|
__ISB();
|
|
#endif
|
|
|
|
// 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;
|
|
}
|