blinky.c

Go to the documentation of this file.

/*
 * @brief Blinky example using a timer and interrupt
 *
 * @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"
#include <stdio.h>

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

#define TICKRATE1_HZ 10
#define TICKRATE2_HZ 7

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

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

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

void TIMER1_IRQHandler(void)
{
 static bool On = false;

 if (Chip_TIMER_MatchPending(LPC_TIMER1, 1)) {
  Chip_TIMER_ClearMatch(LPC_TIMER1, 1);
  On = (bool) !On;
  Board_LED_Set(0, On);
 }
}

void TIMER2_IRQHandler(void)
{
 static bool On = false;

 if (Chip_TIMER_MatchPending(LPC_TIMER2, 1)) {
  Chip_TIMER_ClearMatch(LPC_TIMER2, 1);
  On = (bool) !On;
  Board_LED_Set(1, On);
 }
}

int main(void)
{
 uint32_t timerFreq;

 Board_Init();

 DEBUGSTR("Blinky example using timers 1 and 2!\r\n");

 /* Enable timer 1 clock and get clock rate */
 Chip_TIMER_Init(LPC_TIMER1);
#if defined(CHIP_LPC175X_6X) 
 timerFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_TIMER1);
#else
 timerFreq = Chip_Clock_GetPeripheralClockRate();
#endif

 Chip_TIMER_Reset(LPC_TIMER1);
 Chip_TIMER_MatchEnableInt(LPC_TIMER1, 1);
 Chip_TIMER_SetMatch(LPC_TIMER1, 1, (timerFreq / TICKRATE1_HZ));
 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER1, 1);
 Chip_TIMER_Enable(LPC_TIMER1);

 /* Enable timer interrupt */
 NVIC_EnableIRQ(TIMER1_IRQn);
 NVIC_ClearPendingIRQ(TIMER1_IRQn);

 DEBUGOUT("Timer 1 clock     = %d Hz\r\n", timerFreq);
 DEBUGOUT("Timer 1 tick rate = %d Hz\r\n", TICKRATE1_HZ);

 /* Enable timer 2 clock and get clock rate */
 Chip_TIMER_Init(LPC_TIMER2);
#if defined(CHIP_LPC175X_6X) 
 timerFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_TIMER2);
#else
 timerFreq = Chip_Clock_GetPeripheralClockRate();
#endif

 Chip_TIMER_Reset(LPC_TIMER2);
 Chip_TIMER_MatchEnableInt(LPC_TIMER2, 1);
 Chip_TIMER_SetMatch(LPC_TIMER2, 1, (timerFreq / TICKRATE2_HZ));
 Chip_TIMER_ResetOnMatchEnable(LPC_TIMER2, 1);
 Chip_TIMER_Enable(LPC_TIMER2);

 /* Enable timer interrupt */
 NVIC_EnableIRQ(TIMER2_IRQn);
 NVIC_ClearPendingIRQ(TIMER2_IRQn);

 DEBUGOUT("Timer 2 clock     = %d Hz\r\n", timerFreq);
 DEBUGOUT("Timer 2 tick rate = %d Hz\r\n", TICKRATE2_HZ);

 while (1) {
  __WFI();
 }
}