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.
Aquatic-Robotic-Courier/software/ARC-FW/samd21a/gcc/system_samd21.c

65 lines
1.6 KiB
C

/**
* \file
*
* \brief Low-level initialization functions called upon chip startup.
*
* Copyright (c) 2018 Microchip Technology Inc.
*
* \asf_license_start
*
* \page License
*
* 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 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 "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;
}