227 lines
7.7 KiB
C
227 lines
7.7 KiB
C
/*
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* @brief LPC8xx WWDT chip driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2012
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* All rights reserved.
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*
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* @par
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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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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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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' and its
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* licensor's relevant copyrights 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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#ifndef __WWDT_8XX_H_
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#define __WWDT_8XX_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @defgroup LPC_WWDT CHIP: LPC8xx Windowed Watchdog driver
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* @ingroup CHIP_8XX_Drivers
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* @{
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*/
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/*!< WDT oscillator frequency value */
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#define WDT_OSC (LPC8XX_IRC_FREQ)
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/**
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* @brief Windowed Watchdog register block structure
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*/
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typedef struct { /*!< WWDT Structure */
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__IO uint32_t MOD; /*!< Watchdog mode register. This register contains the basic mode and status of the Watchdog Timer. */
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__IO uint32_t TC; /*!< Watchdog timer constant register. This register determines the time-out value. */
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__O uint32_t FEED; /*!< Watchdog feed sequence register. Writing 0xAA followed by 0x55 to this register reloads the Watchdog timer with the value contained in WDTC. */
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__I uint32_t TV; /*!< Watchdog timer value register. This register reads out the current value of the Watchdog timer. */
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__I uint32_t RESERVED0;
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__IO uint32_t WARNINT; /*!< Watchdog warning interrupt register. This register contains the Watchdog warning interrupt compare value. */
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__IO uint32_t WINDOW; /*!< Watchdog timer window register. This register contains the Watchdog window value. */
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} LPC_WWDT_T;
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/* Reserved bits masks for registers */
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#define WWDT_MOD_RESERVED (~0x3f)
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#define WWDT_TC_RESERVED 0xff000000
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#define WWDT_FEED_RESERVED (~0xff)
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#define WWDT_TV_RESERVED 0xff000000
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#define WWDT_WARNINT_RESERVED (~0x3ff)
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#define WWDT_WINDOW_RESERVED 0xff000000
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/**
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* @brief Watchdog Mode register definitions
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*/
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/** Watchdog Mode Bitmask */
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#define WWDT_WDMOD_BITMASK ((uint32_t) 0x1F)
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/** WWDT interrupt enable bit */
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#define WWDT_WDMOD_WDEN ((uint32_t) (1 << 0))
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/** WWDT interrupt enable bit */
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#define WWDT_WDMOD_WDRESET ((uint32_t) (1 << 1))
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/** WWDT time out flag bit */
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#define WWDT_WDMOD_WDTOF ((uint32_t) (1 << 2))
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/** WDT Time Out flag bit */
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#define WWDT_WDMOD_WDINT ((uint32_t) (1 << 3))
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/**
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* @brief Initialize the Watchdog timer
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @return None
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*/
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void Chip_WWDT_Init(LPC_WWDT_T *pWWDT);
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/**
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* @brief Shutdown the Watchdog timer
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @return None
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*/
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void Chip_WWDT_DeInit(LPC_WWDT_T *pWWDT);
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/**
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* @brief Set WDT timeout constant value used for feed
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @param timeout : WDT timeout in ticks, between WWDT_TICKS_MIN and WWDT_TICKS_MAX
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* @return none
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*/
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STATIC INLINE void Chip_WWDT_SetTimeOut(LPC_WWDT_T *pWWDT, uint32_t timeout)
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{
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pWWDT->TC = timeout;
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}
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/**
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* @brief Feed watchdog timer
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @return None
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* @note If this function isn't called, a watchdog timer warning will occur.
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* After the warning, a timeout will occur if a feed has happened.
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*/
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STATIC INLINE void Chip_WWDT_Feed(LPC_WWDT_T *pWWDT)
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{
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pWWDT->FEED = 0xAA;
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pWWDT->FEED = 0x55;
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}
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/**
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* @brief Set WWDT warning interrupt
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @param timeout : WDT warning in ticks, between 0 and 1023
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* @return None
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* @note This is the number of ticks after the watchdog interrupt that the
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* warning interrupt will be generated.
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*/
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STATIC INLINE void Chip_WWDT_SetWarning(LPC_WWDT_T *pWWDT, uint32_t timeout)
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{
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pWWDT->WARNINT = timeout;
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}
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/**
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* @brief Set WWDT window time
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @param timeout : WDT timeout in ticks, between WWDT_TICKS_MIN and WWDT_TICKS_MAX
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* @return None
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* @note The watchdog timer must be fed between the timeout from the Chip_WWDT_SetTimeOut()
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* function and this function, with this function defining the last tick before the
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* watchdog window interrupt occurs.
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*/
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STATIC INLINE void Chip_WWDT_SetWindow(LPC_WWDT_T *pWWDT, uint32_t timeout)
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{
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pWWDT->WINDOW = timeout;
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}
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/**
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* @brief Enable watchdog timer options
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @param options : An or'ed set of options of values
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* WWDT_WDMOD_WDEN, WWDT_WDMOD_WDRESET, and WWDT_WDMOD_WDPROTECT
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* @return None
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* @note You can enable more than one option at once (ie, WWDT_WDMOD_WDRESET |
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* WWDT_WDMOD_WDPROTECT), but use the WWDT_WDMOD_WDEN after all other options
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* are set (or unset) with no other options. If WWDT_WDMOD_LOCK is used, it cannot
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* be unset.
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*/
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STATIC INLINE void Chip_WWDT_SetOption(LPC_WWDT_T *pWWDT, uint32_t options)
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{
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pWWDT->MOD = options | (pWWDT->MOD & ~WWDT_MOD_RESERVED);
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}
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/**
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* @brief Disable/clear watchdog timer options
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @param options : An or'ed set of options of values
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* WWDT_WDMOD_WDEN, WWDT_WDMOD_WDRESET, and WWDT_WDMOD_WDPROTECT
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* @return None
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* @note You can disable more than one option at once (ie, WWDT_WDMOD_WDRESET |
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* WWDT_WDMOD_WDTOF).
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*/
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STATIC INLINE void Chip_WWDT_UnsetOption(LPC_WWDT_T *pWWDT, uint32_t options)
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{
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pWWDT->MOD &= (~options) & WWDT_WDMOD_BITMASK;
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}
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/**
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* @brief Enable WWDT activity
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @return None
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*/
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STATIC INLINE void Chip_WWDT_Start(LPC_WWDT_T *pWWDT)
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{
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Chip_WWDT_SetOption(pWWDT, WWDT_WDMOD_WDEN);
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Chip_WWDT_Feed(pWWDT);
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}
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/**
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* @brief Read WWDT status flag
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @return Watchdog status, an Or'ed value of WWDT_WDMOD_*
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*/
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STATIC INLINE uint32_t Chip_WWDT_GetStatus(LPC_WWDT_T *pWWDT)
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{
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return pWWDT->MOD;
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}
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/**
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* @brief Clear WWDT interrupt status flags
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @param status : Or'ed value of status flag(s) that you want to clear, should be:
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* - WWDT_WDMOD_WDTOF: Clear watchdog timeout flag
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* - WWDT_WDMOD_WDINT: Clear watchdog warning flag
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* @return None
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*/
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void Chip_WWDT_ClearStatusFlag(LPC_WWDT_T *pWWDT, uint32_t status);
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/**
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* @brief Get the current value of WDT
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* @param pWWDT : The base of WatchDog Timer peripheral on the chip
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* @return current value of WDT
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*/
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STATIC INLINE uint32_t Chip_WWDT_GetCurrentCount(LPC_WWDT_T *pWWDT)
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{
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return pWWDT->TV;
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}
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* __WWDT_8XX_H_ */
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