274 lines
7.8 KiB
C
274 lines
7.8 KiB
C
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/**********************************************************************
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* $Id$ lpc43xx_wwdt.c 2011-06-02
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*//**
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* @file lpc43xx_wwdt.c
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* @brief Contains all functions support for WDT firmware library
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* on lpc43xx
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* @version 1.0
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* @date 02. June. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors<EFBFBD>
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup WWDT
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "lpc43xx_wwdt.h"
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/* If this source file built with example, the lpc43xx FW library configuration
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* file in each example directory ("lpc43xx_libcfg.h") must be included,
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* otherwise the default FW library configuration file must be included instead
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc43xx_libcfg.h"
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#else
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#include "lpc43xx_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _WWDT
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void WWDT_SetTimeOut(uint32_t timeout);
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/*********************************************************************//**
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* @brief Update WDT timeout value and feed
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* @param[in] timeout WDT timeout (us)
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* @return none
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**********************************************************************/
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void WWDT_SetTimeOut(uint32_t timeout)
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{
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uint32_t timeoutVal;
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timeoutVal = WDT_GET_FROM_USEC(timeout);
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if(timeoutVal < WWDT_TIMEOUT_MIN)
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{
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timeoutVal = WWDT_TIMEOUT_MIN;
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}
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else if (timeoutVal > WWDT_TIMEOUT_MAX)
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{
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timeoutVal = WWDT_TIMEOUT_MAX;
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}
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LPC_WWDT->TC = timeoutVal;
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}
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup WDT_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Initial for Watchdog function
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* @param[in] none
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* @return None
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**********************************************************************/
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void WWDT_Init(void)
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{
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LPC_WWDT->MOD = 0; // Clear time out and interrupt flags
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LPC_WWDT->TC = WWDT_TIMEOUT_MIN; // Reset time out
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LPC_WWDT->WARNINT= 0; // Reset warning value
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LPC_WWDT->WINDOW = WWDT_WINDOW_MAX; // Reset window value
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}
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/********************************************************************//**
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* @brief Update WDT timeout value and feed
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* @param[in] TimeOut TimeOut value to be updated, should be in range:
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* 2048 .. 134217728
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* @return None
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*********************************************************************/
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void WDT_UpdateTimeOut(uint32_t TimeOut)
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{
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/* check WDPROTECT,
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* if it is enable, wait until the counter is below the value of
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* WDWARNINT and WDWINDOW
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*/
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if(LPC_WWDT->MOD & (1<<4))
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{
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while((LPC_WWDT->TV <(LPC_WWDT->WARNINT & WWDT_WDWARNINT_MASK))\
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&&(LPC_WWDT->TV <(LPC_WWDT->WINDOW & WWDT_WDTC_MASK)));
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}
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WWDT_SetTimeOut(TimeOut);
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}
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/********************************************************************//**
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* @brief After set WDTEN, call this function to start Watchdog
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* or reload the Watchdog timer
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* @param[in] None
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* @return None
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*********************************************************************/
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void WWDT_Feed (void)
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{
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LPC_WWDT->FEED = 0xAA;
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LPC_WWDT->FEED = 0x55;
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}
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/********************************************************************//**
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* @brief Update WDT timeout value and feed
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* @param[in] WarnTime time to generate watchdog warning interrupt(us)
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* should be in range: 2048 .. 8192
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* @return None
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*********************************************************************/
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void WWDT_SetWarning(uint32_t WarnTime)
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{
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uint32_t warnVal;
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warnVal = WDT_GET_FROM_USEC(WarnTime);
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if(warnVal <= WWDT_WARNINT_MIN)
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{
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warnVal = WWDT_WARNINT_MIN;
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}
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else if (warnVal >= WWDT_WARNINT_MAX)
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{
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warnVal = WWDT_WARNINT_MAX;
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}
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LPC_WWDT->WARNINT = warnVal;
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}
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/********************************************************************//**
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* @brief Update WDT timeout value and feed
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* @param[in] WindowedTime expected time to set watchdog window event(us)
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* @return none
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*********************************************************************/
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void WWDT_SetWindow(uint32_t WindowedTime)
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{
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uint32_t wndVal;
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wndVal = WDT_GET_FROM_USEC(WindowedTime);
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if(wndVal <= WWDT_WINDOW_MIN)
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{
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wndVal = WWDT_WINDOW_MIN;
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}
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else if (wndVal >= WWDT_WINDOW_MAX)
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{
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wndVal = WWDT_WINDOW_MAX;
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}
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LPC_WWDT->WINDOW = wndVal;
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}
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/*********************************************************************//**
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* @brief Enable/Disable WWDT activity
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* @param[in] None
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* @return None
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**********************************************************************/
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void WWDT_Configure(st_Wdt_Config wdtCfg)
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{
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WWDT_SetTimeOut(wdtCfg.wdtTmrConst);
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if(wdtCfg.wdtReset)
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{
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LPC_WWDT->MOD |= WWDT_WDMOD_WDRESET;
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}
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else
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{
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LPC_WWDT->MOD &= ~WWDT_WDMOD_WDRESET;
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}
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if(wdtCfg.wdtProtect)
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{
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LPC_WWDT->MOD |= WWDT_WDMOD_WDPROTECT;
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}
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else
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{
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LPC_WWDT->MOD &= ~WWDT_WDMOD_WDPROTECT;
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}
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}
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/*********************************************************************//**
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* @brief Enable WWDT activity
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* @param[in] None
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* @return None
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**********************************************************************/
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void WWDT_Start(void)
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{
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LPC_WWDT->MOD |= WWDT_WDMOD_WDEN;
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WWDT_Feed();
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}
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/********************************************************************//**
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* @brief Read WWDT status flag
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* @param[in] Status kind of status flag that you want to get, should be:
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* - WWDT_WARNINT_FLAG: watchdog interrupt flag
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* - WWDT_TIMEOUT_FLAG: watchdog time-out flag
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* @return Time out flag status of WDT
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*********************************************************************/
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FlagStatus WWDT_GetStatus (uint8_t Status)
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{
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if(Status == WWDT_WARNINT_FLAG)
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{
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return ((FlagStatus)(LPC_WWDT->MOD & (1<<3)));
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}
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else if (Status == WWDT_TIMEOUT_FLAG)
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{
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return ((FlagStatus)(LPC_WWDT->MOD & (1<<2)));
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}
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return (FlagStatus)RESET;
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}
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/********************************************************************//**
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* @brief Read WWDT status flag
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* @param[in] Status kind of status flag that you want to get, should be:
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* - WWDT_WARNINT_FLAG: watchdog interrupt flag
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* - WWDT_TIMEOUT_FLAG: watchdog time-out flag
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* @return Time out flag status of WDT
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*********************************************************************/
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void WWDT_ClearStatusFlag (uint8_t flag)
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{
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if(flag == WWDT_WARNINT_FLAG)
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{
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// Write 1 to this bit to clear itself
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LPC_WWDT->MOD |= WWDT_WDMOD_WDINT;
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}
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else if(flag == WWDT_TIMEOUT_FLAG)
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{
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// Write 0 to this bit to clear itself
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LPC_WWDT->MOD &= ~ WWDT_WDMOD_WDTOF;
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}
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}
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/********************************************************************//**
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* @brief Get the current value of WDT
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* @param[in] None
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* @return current value of WDT
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*********************************************************************/
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uint32_t WWDT_GetCurrentCount(void)
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{
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return LPC_WWDT->TV;
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}
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/**
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* @}
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*/
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#endif /* _WWDT */
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/**
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* @}
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*/
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