97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
/*
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* @brief Blinky example using timers and sysTick
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2013
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "board.h"
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#include <stdio.h>
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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#define TICKRATE_HZ1 (15) /* 15 ticks per second */
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/**
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* @brief Handle interrupt from SysTick timer
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* @return Nothing
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*/
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void SysTick_Handler(void)
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{
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Board_LED_Toggle(0);
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Board_LED_Toggle(1);
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}
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/**
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* @brief main routine for blinky example
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* @return Function should not exit.
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*/
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int main(void)
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{
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uint32_t sysTickRate;
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SystemCoreClockUpdate();
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Board_Init();
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Board_LED_Set(0, false);
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Board_LED_Set(1, true);
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/* The sysTick counter only has 24 bits of precision, so it will
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overflow quickly with a fast core clock. You can alter the
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sysTick divider to generate slower sysTick clock rates. */
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Chip_Clock_SetSysTickClockDiv(1);
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/* A SysTick divider is present that scales the sysTick rate down
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from the core clock. Using the SystemCoreClock variable as a
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rate reference for the SysTick_Config() function won't work,
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so get the sysTick rate by calling Chip_Clock_GetSysTickClockRate() */
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sysTickRate = Chip_Clock_GetSysTickClockRate();
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/* Enable and setup SysTick Timer at a periodic rate */
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SysTick_Config(sysTickRate / TICKRATE_HZ1);
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/* LEDs toggle in interrupt handlers */
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while (1) {
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__WFI();
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}
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return 0;
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}
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