rt-thread/bsp/lpc408x/Libraries/Drivers/source/lpc_wwdt.c

/**********************************************************************
* $Id$      lpc_wwdt.c          2011-06-02
*//**
* @file     lpc_wwdt.c
* @brief    Contains all functions support for Wachtdog Timer
*           firmware library on LPC
* @version  1.0
* @date     02. June. 2011
* @author   NXP MCU SW Application Team
* 
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors'
* relevant copyright 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.
**********************************************************************/

/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup WWDT
 * @{
 */
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc_libcfg.h"
#else
#include "lpc_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _WDT

/* Includes ------------------------------------------------------------------- */
#include "lpc_wwdt.h"
#include "lpc_clkpwr.h"
#include "lpc_pinsel.h"


 /* Public Functions ----------------------------------------------------------- */
 /** @addtogroup WDT_Public_Functions
  * @{
  */

 /********************************************************************//**
 * @brief       Set timeout value to Timer Constant register 
 *              (if enable) to generate a WatchDog event if match
 *
 * @param[in]   timeoutVal  The value (counter) will write directly to 
 *              Register w/o pre-calc
 *
 * @return      None
 *********************************************************************/
int8_t WWDT_SetTimeOutRaw(uint32_t timeoutVal)
{
    int8_t retval = 0;

    if(timeoutVal < WWDT_TIMEOUT_MIN)
    {
        timeoutVal = WWDT_TIMEOUT_MIN;
        retval = WWDT_FUNC_BAD_PARAM;
    }
    else if (timeoutVal > WWDT_TIMEOUT_MAX)
    {
        timeoutVal = WWDT_TIMEOUT_MAX;
        retval = WWDT_FUNC_BAD_PARAM;
    }

    LPC_WDT->TC = timeoutVal;

    return retval;
}


/********************************************************************//**
 * @brief       Set WDT timeout (cal by usec) to TC register
 *
 * @param[in]   timeout The time (usec) to generate watchdog event if 
 *              the watchdog counter reach this value
 *
 * @return      WWDT_FUNC_OK if success
 *********************************************************************/
int8_t WWDT_SetTimeOut(uint32_t timeout)
{
    return WWDT_SetTimeOutRaw(WDT_GET_FROM_USEC(timeout));
}


/*********************************************************************//**
* @brief        Initial for Watchdog function by setting timeout
*
* @param[in]    TimeOut time out value, should be in range:
*               2048 .. 134217728
*
* @return      WWDT_FUNC_OK if success
 **********************************************************************/
int8_t WWDT_Init(uint32_t TimeOut)
{
    return WWDT_SetTimeOut(TimeOut);
}

/*********************************************************************//**
 * @brief       Configure the WatchDog by initialization all the timing
 *              value for register (Warning value, Window value,...)
 *
 * @param       wdtCfg a the st_Wdt_Config type value
 *
 * @return      None
 **********************************************************************/
void WWDT_Configure(st_Wdt_Config wdtCfg)
{
    WWDT_SetTimeOut(wdtCfg.wdtTmrConst);

    if(wdtCfg.wdtEnable)
    {
        LPC_WDT->MOD |= WWDT_WDMOD_WDEN;
    }
    else
    {
        LPC_WDT->MOD &= ~WWDT_WDMOD_WDEN;
    }

    if(wdtCfg.wdtReset)
    {
        LPC_WDT->MOD |= WWDT_WDMOD_WDRESET;
    }
    else
    {
        LPC_WDT->MOD &= ~WWDT_WDMOD_WDRESET;
    }

    if(wdtCfg.wdtProtect)
    {
        LPC_WDT->MOD |= WWDT_WDMOD_WDPROTECT;
    }
    else
    {
        LPC_WDT->MOD &= ~WWDT_WDMOD_WDPROTECT;
    }

    WWDT_SetWarning(wdtCfg.wdtWarningVal);

    WWDT_SetWindow(wdtCfg.wdtWindowVal);
}

/*********************************************************************//**
 * @brief       Start WatchDog with specific Timeout
 *
 * @param       TimeOut specific Timeout for WatchDog event
 *
 * @return      WWDT_FUNC_OK if success
 **********************************************************************/
int8_t WWDT_Start(uint32_t TimeOut)
{
    int8_t retval = WWDT_FUNC_OK;

    retval = WWDT_SetTimeOut(TimeOut);

    WWDT_Cmd(ENABLE);

    return retval;
}


/********************************************************************//**
 * @brief       Update WDT timeout value and feed
 *
 * @param[in]   WarnTime    time to generate watchdog warning interrupt(us)
 *              should be in range: 2048 .. 134217728
 *
 * @return      None
 *********************************************************************/
void WWDT_SetTimerConstant(uint32_t constVal)
{
    LPC_WDT->TC = constVal;
}


/*********************************************************************//**
 * @brief       Enable/Disable WDT function
 *
 * @param[in]   Mode WWDT mode that will be enabled/disabled, should be:
 *              - WWDT_PROTECT_MODE : protect mode
 *              - WWDT_RESET_MODE   : reset mode
 *
 * @param[in]   NewState new state of protection function, should be:
 *              - ENABLE: The watchdog reload value can be changed at any time
 *              - DISABLE: The watchdog reload value can be changed only after
 *                         the counter is below the value of WDWARNINT and WDWINDOW
 *
 * @return      None
 **********************************************************************/
void WWDT_SetMode(uint8_t mode, FunctionalState NewState)
{
    if (mode == WWDT_PROTECT_MODE )
    {
        if(NewState == ENABLE)
            LPC_WDT->MOD |= WWDT_WDMOD_WDPROTECT;
        else
            LPC_WDT->MOD &= ~WWDT_WDMOD_WDPROTECT;
    }
    else if(mode == WWDT_RESET_MODE)
    {
        if(NewState == ENABLE)
            LPC_WDT->MOD |= WWDT_WDMOD_WDRESET;
        else
            LPC_WDT->MOD &= ~WWDT_WDMOD_WDRESET;
    }
}

/*********************************************************************//**
 * @brief       Enable/Disable WWDT activity
 *
 * @param[in]   NewState To enable/disable the WatchDog
 *
 * @return      None
 **********************************************************************/
void WWDT_Enable(FunctionalState NewState)
{
    if(NewState == ENABLE)
    {
        LPC_WDT->MOD |= WWDT_WDMOD_WDEN;
    }
    else
    {
        LPC_WDT->MOD &= ~WWDT_WDMOD_WDEN;
    }
}

/*********************************************************************//**
 * @brief       Enable/Disable WWDT activity. In case of Enable, it will
 *              do feeding WatchDog for its normal operation.
 *
 * @param[in]   NewState To enable/disable the WatchDog
 *
 * @return      None
 **********************************************************************/
void WWDT_Cmd(FunctionalState NewState)
{
    if(NewState == ENABLE)
    {
        LPC_WDT->MOD |= WWDT_WDMOD_WDEN;

        //Load the Feed register to start using WDT
        WWDT_Feed();
    }
    else
    {
        LPC_WDT->MOD &= ~WWDT_WDMOD_WDEN;
    }
}

/********************************************************************//**
 * @brief       Set the warning value to register to generate interrupt
 *              (if enable) if the watchdog timer matches this value.
 *
 * @param[in]   warnVal The value (counter) will write directly to Warning 
 *              Register w/o pre-calc
 *
 * @return      WWDT_FUNC_OK if success
 *********************************************************************/
int8_t WWDT_SetWarningRaw(uint32_t warnVal)
{
    int8_t retval = WWDT_FUNC_OK;

    if(warnVal < WWDT_WARNINT_MIN)
    {
        warnVal = WWDT_WARNINT_MIN;
        retval = WWDT_FUNC_BAD_PARAM;
    }
    else if (warnVal > WWDT_WARNINT_MAX)
    {
        warnVal = WWDT_WARNINT_MAX;
        retval = WWDT_FUNC_BAD_PARAM;
    }

    LPC_WDT->WARNINT = warnVal;

    return retval;
}

/********************************************************************//**
 * @brief       Update WDT warning time (cal by usec) to warning register
 *
 * @param[in]   WarnTime The time (usec) to generate watchdog warning
 *              interrupt should be in range: 2048 .. 8192
 *
 * @return      WWDT_FUNC_OK if success
 *********************************************************************/
int8_t WWDT_SetWarning(uint32_t WarnTime)
{
    return WWDT_SetWarningRaw(WDT_GET_FROM_USEC(WarnTime));
}


/********************************************************************//**
 * @brief       Update WDT Windows value (by counter) to Window Register
 *              of WatchDog
 *
 * @param[in]   wndVal The value (counter) will write directly to Window
 *              Register w/o pre-calc
 *
 * @return      WWDT_FUNC_OK if success
 *********************************************************************/
int8_t WWDT_SetWindowRaw(uint32_t wndVal)
{
    int8_t retval = WWDT_FUNC_OK;

    if(wndVal < WWDT_WINDOW_MIN)
    {
        wndVal = WWDT_WINDOW_MIN;
        retval = WWDT_FUNC_BAD_PARAM;
    }
    else if (wndVal > WWDT_WINDOW_MAX)
    {
        wndVal = WWDT_WINDOW_MAX;
        retval = WWDT_FUNC_BAD_PARAM;
    }

    LPC_WDT->WINDOW = wndVal;

    return retval;
}


/********************************************************************//**
 * @brief       Update WDT Windows value (by usec) to Window Register
 *              of WatchDog
 *
 * @param[in]   WindowedTime Expected time (usec) to set watchdog window event
 *
 * @return      WWDT_FUNC_OK if success
 *********************************************************************/
int8_t WWDT_SetWindow(uint32_t WindowedTime)
{
    return WWDT_SetWindowRaw(WDT_GET_FROM_USEC(WindowedTime));
}


/********************************************************************//**
 * @brief       Update WDT timeout value for WatchDog event(s)
 *
 * @param[in]   TimeOut Time Out value (usec) to be updated, should be
 *              in range: 2048 .. 134217728
 *
 * @return      None
 *********************************************************************/
void WDT_UpdateTimeOut(uint32_t TimeOut)
{
    /* check WDPROTECT,
     * if it is enable, wait until the counter is below the value of
     * WDWARNINT and WDWINDOW
     */
    if(LPC_WDT->MOD & (1<<4))
    {
        while((LPC_WDT->TV <(LPC_WDT->WARNINT & WWDT_WDWARNINT_MASK))\
                        &&(LPC_WDT->TV <(LPC_WDT->WINDOW & WWDT_WDTC_MASK)));
    }

    WWDT_SetTimeOut(TimeOut);
}


/********************************************************************//**
 * @brief       Read WWDT status flag
 *
 * @param[in]   Status kind of status flag that you want to get, should be:
 *              - WWDT_WARNINT_FLAG: watchdog interrupt flag
 *              - WWDT_TIMEOUT_FLAG: watchdog time-out flag
 *
 * @return      Time out flag status of WDT
 *********************************************************************/
FlagStatus WWDT_GetStatus (uint8_t Status)
{
    if(Status == WWDT_WARNINT_FLAG)
    {
        return ((FlagStatus)(LPC_WDT->MOD & (1<<3)));
    }
    else if (Status == WWDT_TIMEOUT_FLAG)
    {
        return ((FlagStatus)(LPC_WDT->MOD & (1<<2)));
    }
    return RESET;
}

/********************************************************************//**
 * @brief       Clear WWDT status flag
 *
 * @param[in]   Status kind of status flag that you want to get, should be:
 *              - WWDT_WARNINT_FLAG: watchdog interrupt flag
 *              - WWDT_TIMEOUT_FLAG: watchdog time-out flag
 *
 * @return      None
 *********************************************************************/
void WWDT_ClearStatusFlag (uint8_t flag)
{
    if(flag == WWDT_WARNINT_FLAG)
    {
        // Write 1 to this bit to clear itself
        LPC_WDT->MOD |= WWDT_WDMOD_WDINT;
    }
    else if(flag == WWDT_TIMEOUT_FLAG)
    {
        // Write 0 to this bit to clear itself
        LPC_WDT->MOD &= ~ WWDT_WDMOD_WDTOF;
    }
}

/********************************************************************//**
 * @brief       Clear WDT Time out flag
 * @param       None
 * @return      None
 *********************************************************************/
void WWDT_ClrTimeOutFlag (void)
{
    LPC_WDT->MOD &= ~ WWDT_WDMOD_WDTOF;
}


/********************************************************************//**
 * @brief       Following the standard sequence to Feed the WatchDog Timer
 *
 * @param       None
 *
 * @return      None
 *********************************************************************/
void WWDT_FeedStdSeq (void)
{
    LPC_WDT->FEED = 0xAA;

    LPC_WDT->FEED = 0x55;
}

/********************************************************************//**
 * @brief       After set WDTEN, call this function to start Watchdog
 *              or reload the Watchdog timer
 *
 * @param       None
 *
 * @return      None
 *********************************************************************/
void WWDT_Feed (void)
{
    // Disable irq interrupt
    __disable_irq();

    WWDT_FeedStdSeq();

    // Then enable irq interrupt
    __enable_irq();
}

/********************************************************************//**
 * @brief       Get the current value of WDT
 *
 * @param       None
 *
 * @return      Current value of WDT
 *********************************************************************/
uint32_t WWDT_GetCurrentCount(void)
{
    return LPC_WDT->TV;
}

/**
 * @}
 */

#endif /*_WDT*/
/**
 * @}
 */

/* --------------------------------- End Of File ------------------------------ */