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