atimer.c

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/*
 * @brief ATIMER example
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

#include "board.h"

/*****************************************************************************
 * Private types/enumerations/variables
 ****************************************************************************/

#define PresetCount (CRYSTAL_32K_FREQ_IN / 32)

/*****************************************************************************
 * Public types/enumerations/variables
 ****************************************************************************/

/*****************************************************************************
 * Private functions
 ****************************************************************************/

/* Clearn interrupts */
static void ATIMER_ClearInts(void)
{
 /* Clear Alarm Timer interrupt status */
 Chip_ATIMER_ClearIntStatus(LPC_ATIMER);

 /* Clear Alarm Timer interrupt flag */
 Chip_EVRT_ClrPendIntSrc(EVRT_SRC_ATIMER);
}

/*****************************************************************************
 * Public functions
 ****************************************************************************/

void EVRT_IRQHandler(void)
{
 /* Check if source interrupt is ATIMER */
 if (Chip_EVRT_IsSourceInterrupting(EVRT_SRC_ATIMER)) {
  ATIMER_ClearInts();
 }
}

int main(void)
{
 bool On = false;

 Board_Init();

 /* Init Alarm Timer with Preset Count for about 1s */
 Chip_ATIMER_Init(LPC_ATIMER, PresetCount);

 /* Init EVRT */
 Chip_EVRT_Init();

 /* Enable EVRT in order to be able to read the ATIMER interrupt */
 Chip_EVRT_ConfigIntSrcActiveType(EVRT_SRC_ATIMER, EVRT_SRC_ACTIVE_HIGH_LEVEL);

 /* Enable Alarm Timer Source */
 Chip_EVRT_SetUpIntSrc(EVRT_SRC_ATIMER, ENABLE);

 /* Enable NVIC */
 NVIC_EnableIRQ(EVENTROUTER_IRQn);

 /* Clear the interrupt states */
 ATIMER_ClearInts();

 /* Enable Alarm Timer */
 Chip_ATIMER_IntEnable(LPC_ATIMER);

 while (1) {
  /* Sleep until ATIMER fires */
  __WFI();
  On = (bool) !On;
  Board_LED_Set(1, On);
 }
}