rt-thread/bsp/lpc824/Libraries/peri_driver/mrt/mrt_8xx.h

/*
 * @brief LPC8xx Multi-Rate Timer (MRT) registers and driver functions
 *
 * @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.
 */

#ifndef __MRT_8XX_H_
#define __MRT_8XX_H_

#ifdef __cplusplus
extern "C" {
#endif

/** @defgroup MRT_8XX CHIP: LPC8xx Multi-Rate Timer driver
 * @ingroup CHIP_8XX_Drivers
 * @{
 */

/**
 * @brief LPC8xx MRT chip configuration
 */
#define MRT_CHANNELS_NUM      (4)
#define MRT_NO_IDLE_CHANNEL   (0x40)

/**
 * @brief MRT register block structure
 */
typedef struct {
	__IO uint32_t INTVAL;	/*!< Timer interval register */
	__O  uint32_t TIMER;	/*!< Timer register */
	__IO uint32_t CTRL;		/*!< Timer control register */
	__IO uint32_t STAT;		/*!< Timer status register */
} LPC_MRT_CH_T;

/**
 * @brief MRT register block structure
 */
typedef struct {
	LPC_MRT_CH_T CHANNEL[MRT_CHANNELS_NUM];
	uint32_t unused[45];
	__O  uint32_t IDLE_CH;
	__IO uint32_t IRQ_FLAG;
} LPC_MRT_T;

/* Reserved bits masks for registers */
#define MRT_CTRL_RESERVED   (~7)
#define MRT_STAT_RESERVED   (~3)

/**
 * @brief MRT Interrupt Modes enum
 */
typedef enum MRT_MODE {
	MRT_MODE_REPEAT =  (0 << 1),	/*!< MRT Repeat interrupt mode */
	MRT_MODE_ONESHOT = (1 << 1)		/*!< MRT One-shot interrupt mode */
} MRT_MODE_T;

/**
 * @brief MRT register bit fields & masks
 */
/* MRT Time interval register bit fields */
#define MRT_INTVAL_IVALUE        (0x7FFFFFFFUL)	/* Maximum interval load value and mask */
#define MRT_INTVAL_LOAD          (0x80000000UL)	/* Force immediate load of timer interval register bit */

/* MRT Control register bit fields & masks */
#define MRT_CTRL_INTEN_MASK      (0x01)
#define MRT_CTRL_MODE_MASK       (0x06)

/* MRT Status register bit fields & masks */
#define MRT_STAT_INTFLAG         (0x01)
#define MRT_STAT_RUNNING         (0x02)

/* Pointer to individual MR register blocks */
#define LPC_MRT_CH0         ((LPC_MRT_CH_T *) &LPC_MRT->CHANNEL[0])
#define LPC_MRT_CH1         ((LPC_MRT_CH_T *) &LPC_MRT->CHANNEL[1])
#define LPC_MRT_CH2         ((LPC_MRT_CH_T *) &LPC_MRT->CHANNEL[2])
#define LPC_MRT_CH3         ((LPC_MRT_CH_T *) &LPC_MRT->CHANNEL[3])
#define LPC_MRT_CH(ch)      ((LPC_MRT_CH_T *) &LPC_MRT->CHANNEL[(ch)])

/* Global interrupt flag register interrupt mask/clear values */
#define MRT0_INTFLAG        (1)
#define MRT1_INTFLAG        (2)
#define MRT2_INTFLAG        (4)
#define MRT3_INTFLAG        (8)
#define MRTn_INTFLAG(ch)    (1 << (ch))

/**
 * @brief	Initializes the MRT
 * @return	Nothing
 */
STATIC INLINE void Chip_MRT_Init(void)
{
	/* Enable the clock to the register interface */
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_MRT);

	/* Reset MRT */
	Chip_SYSCTL_PeriphReset(RESET_MRT);
}

/**
 * @brief	De-initializes the MRT Channel
 * @return	Nothing
 */
STATIC INLINE void Chip_MRT_DeInit(void)
{
	/* Disable the clock to the MRT */
	Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_MRT);
}

/**
 * @brief	Returns a pointer to the register block for a MRT channel
 * @param	ch	: MRT channel tog et register block for (0..3)
 * @return	Pointer to the MRT register block for the channel
 */
STATIC INLINE LPC_MRT_CH_T *Chip_MRT_GetRegPtr(uint8_t ch)
{
	return LPC_MRT_CH(ch);
}

/**
 * @brief	Returns the timer time interval value
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	Timer time interval value (IVALUE)
 */
STATIC INLINE uint32_t Chip_MRT_GetInterval(LPC_MRT_CH_T *pMRT)
{
	return pMRT->INTVAL;
}

/**
 * @brief	Sets the timer time interval value
 * @param	pMRT	 : Pointer to selected MRT Channel
 * @param   interval : The interval timeout (31-bits)
 * @return	Nothing
 * @note	Setting bit 31 in timer time interval register causes the time interval value
 * to load immediately, otherwise the time interval value will be loaded in
 * next timer cycle.<br>
 * Example: Chip_MRT_SetInterval(pMRT, 0x500 | MRT_INTVAL_LOAD); // Will load timer interval immediately<br>
 * Example: Chip_MRT_SetInterval(pMRT, 0x500); // Will load timer interval after internal expires
 */
STATIC INLINE void Chip_MRT_SetInterval(LPC_MRT_CH_T *pMRT, uint32_t interval)
{
	pMRT->INTVAL = interval;
}

/**
 * @brief	Returns the current timer value
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	The current timer value
 */
STATIC INLINE uint32_t Chip_MRT_GetTimer(LPC_MRT_CH_T *pMRT)
{
	return pMRT->TIMER;
}

/**
 * @brief	Returns true if the timer is enabled
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	True if enabled, Flase if not enabled
 */
STATIC INLINE bool Chip_MRT_GetEnabled(LPC_MRT_CH_T *pMRT)
{
	return (bool) ((pMRT->CTRL & MRT_CTRL_INTEN_MASK) != 0);
}

/**
 * @brief	Enables the timer
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	Nothing
 */
STATIC INLINE void Chip_MRT_SetEnabled(LPC_MRT_CH_T *pMRT)
{
	pMRT->CTRL = MRT_CTRL_INTEN_MASK | (pMRT->CTRL & ~MRT_CTRL_RESERVED);
}

/**
 * @brief	Disables the timer
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	Nothing
 */
STATIC INLINE void Chip_MRT_SetDisabled(LPC_MRT_CH_T *pMRT)
{
	pMRT->CTRL &= ~(MRT_CTRL_INTEN_MASK | MRT_CTRL_RESERVED);
}

/**
 * @brief	Returns the timer mode (repeat or one-shot)
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	The current timer mode
 */
STATIC INLINE MRT_MODE_T Chip_MRT_GetMode(LPC_MRT_CH_T *pMRT)
{
	return (MRT_MODE_T) (pMRT->CTRL & MRT_CTRL_MODE_MASK);
}

/**
 * @brief	Sets the timer mode (repeat or one-shot)
 * @param	pMRT	: Pointer to selected MRT Channel
 * @param   mode    : Timer mode
 * @return	Nothing
 */
STATIC INLINE void Chip_MRT_SetMode(LPC_MRT_CH_T *pMRT, MRT_MODE_T mode)
{
	uint32_t reg;

	reg = pMRT->CTRL & ~(MRT_CTRL_MODE_MASK | MRT_CTRL_RESERVED);
	pMRT->CTRL = reg | (uint32_t) mode;
}

/**
 * @brief	Check if the timer is configured in repeat mode
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	True if in repeat mode, False if in one-shot mode
 */
STATIC INLINE bool Chip_MRT_IsRepeatMode(LPC_MRT_CH_T *pMRT)
{
	return ((pMRT->CTRL & MRT_CTRL_MODE_MASK) != 0) ? false : true;
}

/**
 * @brief	Check if the timer is configured in one-shot mode
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	True if in one-shot mode, False if in repeat mode
 */
STATIC INLINE bool Chip_MRT_IsOneShotMode(LPC_MRT_CH_T *pMRT)
{
	return ((pMRT->CTRL & MRT_CTRL_MODE_MASK) != 0) ? true : false;
}

/**
 * @brief	Check if the timer has an interrupt pending
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	True if interrupt is pending, False if no interrupt is pending
 */
STATIC INLINE bool Chip_MRT_IntPending(LPC_MRT_CH_T *pMRT)
{
	return (bool) ((pMRT->STAT & MRT_STAT_INTFLAG) != 0);
}

/**
 * @brief	Clears the pending interrupt (if any)
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	Nothing
 */
STATIC INLINE void Chip_MRT_IntClear(LPC_MRT_CH_T *pMRT)
{
	pMRT->STAT = MRT_STAT_INTFLAG | (pMRT->STAT & ~MRT_STAT_RESERVED);
}

/**
 * @brief	Check if the timer is running
 * @param	pMRT	: Pointer to selected MRT Channel
 * @return	True if running, False if stopped
 */
STATIC INLINE bool Chip_MRT_Running(LPC_MRT_CH_T *pMRT)
{
	return (bool) ((pMRT->STAT & MRT_STAT_RUNNING) != 0);
}

/**
 * @brief	Returns the IDLE channel value
 * @return	IDLE channel value (unshifted in bits 7..4)
 */
STATIC INLINE uint8_t Chip_MRT_GetIdleChannel(void)
{
	return (uint8_t) (LPC_MRT->IDLE_CH);
}

/**
 * @brief	Returns the IDLE channel value
 * @return	IDLE channel value (shifted in bits 3..0)
 */
STATIC INLINE uint8_t Chip_MRT_GetIdleChannelShifted(void)
{
	return (uint8_t) (Chip_MRT_GetIdleChannel() >> 4);
}

/**
 * @brief	Returns the interrupt pending status for all MRT channels
 * @return	IRQ pending channel bitfield(bit 0 = MRT0, bit 1 = MRT1, etc.)
 */
STATIC INLINE uint32_t Chip_MRT_GetIntPending(void)
{
	return LPC_MRT->IRQ_FLAG;
}

/**
 * @brief	Returns the interrupt pending status for a singel MRT channel
 * @param	ch	: Channel to check pending interrupt status for
 * @return	IRQ pending channel number
 */
STATIC INLINE bool Chip_MRT_GetIntPendingByChannel(uint8_t ch)
{
	return (bool) (((LPC_MRT->IRQ_FLAG >> ch) & 1) != 0);
}

/**
 * @brief	Clears the interrupt pending status for one or more MRT channels
 * @param	mask	: Channels to clear (bit 0 = MRT0, bit 1 = MRT1, etc.)
 * @return	Nothing
 * @note	Use this function to clear multiple interrupt pending states in
 * a single call via the IRQ_FLAG register. Performs the same function for
 * all MRT channels in a single call as the Chip_MRT_IntClear() does for a
 * single channel.
 */
STATIC INLINE void Chip_MRT_ClearIntPending(uint32_t mask)
{
	LPC_MRT->IRQ_FLAG = mask;
}

/**
 * @}
 */

#ifdef __cplusplus
}
#endif

#endif /* __MRT_8XX_H_ */