[136] | 1 | /**
|
---|
| 2 | * \file
|
---|
| 3 | *
|
---|
| 4 | * \brief Low-level initialization functions called upon chip startup.
|
---|
| 5 | *
|
---|
| 6 | * Copyright (c) 2014 Atmel Corporation. All rights reserved.
|
---|
| 7 | *
|
---|
| 8 | * \asf_license_start
|
---|
| 9 | *
|
---|
| 10 | * \page License
|
---|
| 11 | *
|
---|
| 12 | * Redistribution and use in source and binary forms, with or without
|
---|
| 13 | * modification, are permitted provided that the following conditions are met:
|
---|
| 14 | *
|
---|
| 15 | * 1. Redistributions of source code must retain the above copyright notice,
|
---|
| 16 | * this list of conditions and the following disclaimer.
|
---|
| 17 | *
|
---|
| 18 | * 2. Redistributions in binary form must reproduce the above copyright notice,
|
---|
| 19 | * this list of conditions and the following disclaimer in the documentation
|
---|
| 20 | * and/or other materials provided with the distribution.
|
---|
| 21 | *
|
---|
| 22 | * 3. The name of Atmel may not be used to endorse or promote products derived
|
---|
| 23 | * from this software without specific prior written permission.
|
---|
| 24 | *
|
---|
| 25 | * 4. This software may only be redistributed and used in connection with an
|
---|
| 26 | * Atmel microcontroller product.
|
---|
| 27 | *
|
---|
| 28 | * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
|
---|
| 29 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
---|
| 30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
---|
| 31 | * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
|
---|
| 32 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
---|
| 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
---|
| 34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
---|
| 35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
---|
| 36 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
---|
| 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
---|
| 38 | * POSSIBILITY OF SUCH DAMAGE.
|
---|
| 39 | *
|
---|
| 40 | * \asf_license_stop
|
---|
| 41 | *
|
---|
| 42 | */
|
---|
| 43 |
|
---|
| 44 | #include "samd21.h"
|
---|
| 45 |
|
---|
| 46 | /**
|
---|
| 47 | * Initial system clock frequency. The System RC Oscillator (RCSYS) provides
|
---|
| 48 | * the source for the main clock at chip startup.
|
---|
| 49 | */
|
---|
| 50 | #define __SYSTEM_CLOCK (1000000)
|
---|
| 51 |
|
---|
| 52 | uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/
|
---|
| 53 |
|
---|
| 54 | /**
|
---|
| 55 | * Initialize the system
|
---|
| 56 | *
|
---|
| 57 | * @brief Setup the microcontroller system.
|
---|
| 58 | * Initialize the System and update the SystemCoreClock variable.
|
---|
| 59 | */
|
---|
| 60 | void SystemInit(void)
|
---|
| 61 | {
|
---|
| 62 | // Keep the default device state after reset
|
---|
| 63 | SystemCoreClock = __SYSTEM_CLOCK;
|
---|
| 64 | return;
|
---|
| 65 | }
|
---|
| 66 |
|
---|
| 67 | /**
|
---|
| 68 | * Update SystemCoreClock variable
|
---|
| 69 | *
|
---|
| 70 | * @brief Updates the SystemCoreClock with current core Clock
|
---|
| 71 | * retrieved from cpu registers.
|
---|
| 72 | */
|
---|
| 73 | void SystemCoreClockUpdate(void)
|
---|
| 74 | {
|
---|
| 75 | // Not implemented
|
---|
| 76 | SystemCoreClock = __SYSTEM_CLOCK;
|
---|
| 77 | return;
|
---|
| 78 | }
|
---|