rtc_ev.c

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/*
 * @brief Event Monitor/Recorder 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
 ****************************************************************************/
STATIC volatile bool fIntervalReached;

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

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

/* Shows the current time and date */
static void showTime(IP_RTC_TIME_T *pTime)
{
 DEBUGOUT("Time: %.2d:%.2d:%.2d %.2d/%.2d/%.4d\r\n",
    pTime->time[RTC_TIMETYPE_HOUR],
    pTime->time[RTC_TIMETYPE_MINUTE],
    pTime->time[RTC_TIMETYPE_SECOND],
    pTime->time[RTC_TIMETYPE_MONTH],
    pTime->time[RTC_TIMETYPE_DAYOFMONTH],
    pTime->time[RTC_TIMETYPE_YEAR]);
}

/* Shows timestamp value */
static void showTimeStamp(RTC_EV_TIMESTAMP_T *pTime)
{
 DEBUGOUT(" %.2d:%.2d:%.2d (DOY: %.3d)",
    pTime->hour,
    pTime->min,
    pTime->sec,
    pTime->dayofyear);
}

/*****************************************************************************
 * Public functions
 ****************************************************************************/
void RTC_IRQHandler(void)
{
 RTC_EV_TIMESTAMP_T timestamp;
 uint8_t i = 0;
 uint32_t sec;

 if (Chip_RTC_GetIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE)) {
  /* Clear pending interrupt */
  Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);

  /* display timestamp every 5 seconds in the background */
  sec = Chip_RTC_GetTime(LPC_RTC, RTC_TIMETYPE_SECOND);
  if ((sec % 5) == 0) {
   fIntervalReached = true; /* set flag for background */
  }
 }

 for (i = 0; i < RTC_EV_CHANNEL_NUM; i++) {
  if (Chip_RTC_EV_GetChannelStatus(LPC_RTC, (IP_RTC_EV_CHANNEL_T) i)) {
   uint8_t counter = 0;
   Chip_RTC_EV_GetFirstTimeStamp(LPC_RTC, (IP_RTC_EV_CHANNEL_T) i, &timestamp);
   DEBUGOUT("Event occurred at channel %.1d: ", i);
   showTimeStamp(&timestamp);
   Chip_RTC_EV_GetLastTimeStamp(LPC_RTC, (IP_RTC_EV_CHANNEL_T) i, &timestamp);
   DEBUGOUT(" - ");
   showTimeStamp(&timestamp);
   counter = Chip_RTC_EV_GetCounter(LPC_RTC, (IP_RTC_EV_CHANNEL_T) i);
   DEBUGOUT(", Counter = %.1d\r\n", counter);
   Chip_RTC_EV_ClearChannelStatus(LPC_RTC, (RTC_EV_CHANNEL_T) i);
  }
 }

 if (Chip_RTC_EV_GetStatus(LPC_RTC)) {
  Chip_RTC_EV_ClearStatus(LPC_RTC, Chip_RTC_EV_GetStatus(LPC_RTC));
 }

}

int main(void)
{
 IP_RTC_TIME_T FullTime;

 Board_Init();

 Board_RTC_EV_Init();

 fIntervalReached  = 0;

 DEBUGSTR("The RTC operates on a 1 Hz clock.\r\n" \
    "Register writes can take up to 2 cycles.\r\n" \
    "It will take a few seconds to fully\r\n" \
    "initialize it and start it running.\r\n\r\n");

 DEBUGSTR("We'll print a timestamp every 5 seconds.\r\n");
 DEBUGSTR("When a positive edge occurred on J5.18 or negative edge occurred on J5.17 pin, " \
    "the first and last timestamp will be printed out.\r\n");

 Chip_RTC_Init(LPC_RTC);

 /* Set current time for RTC 2:00:00PM, 2012-10-05 */
 FullTime.time[RTC_TIMETYPE_SECOND]  = 0;
 FullTime.time[RTC_TIMETYPE_MINUTE]  = 0;
 FullTime.time[RTC_TIMETYPE_HOUR]    = 14;
 FullTime.time[RTC_TIMETYPE_DAYOFMONTH]  = 5;
 FullTime.time[RTC_TIMETYPE_DAYOFWEEK]   = 5;
 FullTime.time[RTC_TIMETYPE_DAYOFYEAR]   = 279;
 FullTime.time[RTC_TIMETYPE_MONTH]   = 10;
 FullTime.time[RTC_TIMETYPE_YEAR]    = 2012;

 Chip_RTC_SetFullTime(LPC_RTC, &FullTime);

 /* Set the RTC to generate an interrupt on each second */
 Chip_RTC_CntIncrIntConfig(LPC_RTC, RTC_AMR_CIIR_IMSEC, ENABLE);

 /* Clear interrupt pending */
 Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);

 /* Enable RTC (starts increase the tick counter and second counter register) */
 Chip_RTC_Enable(LPC_RTC, ENABLE);

 /* Initialize Event Monitor/recorder */
 Chip_RTC_EV_Config(LPC_RTC, RTC_EV_CHANNEL_1, RTC_ERCTRL_POL_POSITIVE | RTC_ERCTRL_INPUT_EN); /* Event on Negative edge */
 Chip_RTC_EV_Config(LPC_RTC, RTC_EV_CHANNEL_2, RTC_ERCTRL_POL_POSITIVE); /* Event on Positive edge */
 Chip_RTC_EV_Config(LPC_RTC, RTC_EV_CHANNEL_3, RTC_ERCTRL_POL_NEGATIVE | RTC_ERCTRL_INPUT_EN);/* Event on Negative edge */

 /* Enable Event Monitor/Recorder */
 Chip_RTC_EV_SetMode(LPC_RTC, RTC_EV_MODE_ENABLE_64HZ);

 /* Enable RTC interrupt in NVIC */
 NVIC_EnableIRQ((IRQn_Type) RTC_IRQn);

 /* Loop forever */
 while (1) {
  if (fIntervalReached) { /* Every 5s */
   fIntervalReached = false;

   /* read and display time */
   Chip_RTC_GetFullTime(LPC_RTC, &FullTime);
   showTime(&FullTime);
  }
 }
}