LPC4357 RTC + Wwatchdog

/*
 * @brief RTC example
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2013
 * 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;
static volatile bool fAlarmTimeMatched;
static volatile bool On0, On1;

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

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

/* Gets and shows the current time and date */
static void showTime(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]);
}

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

/**
 * @brief   RTC interrupt handler
 * @return  Nothing
 */
void RTC_IRQHandler(void)
{
    uint32_t sec;

    /* Toggle heart beat LED for each second field change interrupt */
    if (Chip_RTC_GetIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE)) {
        /* Clear pending interrupt */
        Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);
        On0 = (bool) !On0;
        Board_LED_Set(0, On0);
    }

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

    /* Check for alarm match */
    if (Chip_RTC_GetIntPending(LPC_RTC, RTC_INT_ALARM)) {
        /* Clear pending interrupt */
        Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_ALARM);
        fAlarmTimeMatched = true;   /* set alarm handler flag */
    }
}

// WATCHDOG CODE #########################
static volatile int wdtFeedState;
static volatile bool On = false, On1 = false;
static uint8_t ch;

/* WDT interrupt handler */
static void wdt_handle(void) {
    uint32_t wdtStatus = Chip_WWDT_GetStatus(LPC_WWDT);

    On = (bool) !On;

    /* The chip will reset before this happens, but if the WDT doesn't
       have WWDT_WDMOD_WDRESET enabled, this will hit once */
    if (wdtStatus & WWDT_WDMOD_WDTOF) {
        /* A watchdog feed didn't occur prior to window timeout */
        Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF);

        if (wdtFeedState == 2) {
            Chip_WWDT_Start(LPC_WWDT);  /* Needs restart */
        }
    }

    /* Handle warning interrupt */
    if (wdtStatus & WWDT_WDMOD_WDINT) {
        /* A watchdog feed didn't occur prior to warning timeout */
        Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDINT);

        if (wdtFeedState == 1) {
            Chip_WWDT_Feed(LPC_WWDT);
        }
    }
}

void WDT_IRQHandler(void)
{
    wdt_handle();
}

/**
 * @brief   SysTick Interrupt Handler
 * @return  Nothing
 * @note    Systick interrupt handler feeds WWDT
 */
void SysTick_Handler(void)
{
    if (wdtFeedState == 0) {
        On = (bool) !On;
        Chip_WWDT_Feed(LPC_WWDT);
    }
}


//########################################

/**
 * @brief   Main entry point
 * @return  Nothing
 */
int main(void)
{
    RTC_TIME_T FullTime;

    SystemCoreClockUpdate();
    Board_Init();

    fIntervalReached  = 0;
    fAlarmTimeMatched = 0;
    On0 = On1 = false;
    Board_LED_Set(2, false);

    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" \
             "...and another when the alarm occurs.\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 ALARM time for 17 seconds from time */
    FullTime.time[RTC_TIMETYPE_SECOND]  = 17;
    Chip_RTC_SetFullAlarmTime(LPC_RTC, &FullTime);

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

    /* Enable matching for alarm for second, minute, hour fields only */
    Chip_RTC_AlarmIntConfig(LPC_RTC, RTC_AMR_CIIR_IMSEC | RTC_AMR_CIIR_IMMIN | RTC_AMR_CIIR_IMHOUR, ENABLE);

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

    /* Enable RTC interrupt in NVIC */
    NVIC_SetPriority(RTC_IRQn, 7);
    NVIC_EnableIRQ((IRQn_Type) RTC_IRQn);

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

    // WATCHDOG CODE #########################
    /* Watchdog will be fed on each watchdog interrupt */
    wdtFeedState = 0;

    /* Initialize WWDT and event router */
    Chip_WWDT_Init(LPC_WWDT);
    Chip_EVRT_Init();

    /* Set watchdog feed time constant to 1s */
    Chip_WWDT_SetTimeOut(LPC_WWDT, WDT_OSC / 4);

    /* Configure WWDT to reset on timeout */
    Chip_WWDT_SetOption(LPC_WWDT, WWDT_WDMOD_WDRESET);

    /* Clear watchdog warning and timeout interrupts */
    Chip_WWDT_ClearStatusFlag(LPC_WWDT, WWDT_WDMOD_WDTOF | WWDT_WDMOD_WDINT);

    /* Start watchdog */
    Chip_WWDT_Start(LPC_WWDT);

    /* Setup Systick for a 10Hz tick rate. Systick clock is clocked at
       CPU core clock speed */
    SysTick_Config(Chip_Clock_GetRate(CLK_MX_MXCORE) / 20);

    /* Watchdog test options */
    DEBUGOUT("Press '1' to enable watchdog feed on systick interrupt\n\r");
    DEBUGOUT("Press '2' to enable watchdog feed on warning interrupt\n\r");
    DEBUGOUT("Press '3' to disable watchdog feed (will reset device)\n\r");
    DEBUGOUT("Press '4' to switch from WDT interrupt to event router handler\n\r");
    // ###################################

    /* Loop forever */
    while (1) {
        if (fIntervalReached) { /* Every 5s */
            fIntervalReached = 0;

            On1 = (bool) !On1;
            Board_LED_Set(1, On1);

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

        if (fAlarmTimeMatched) {
            fAlarmTimeMatched = false;

            /* announce event */
            DEBUGSTR("ALARM triggered!\r\n");
            Board_LED_Set(2, true);

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