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/*******************************************************************************
 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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 * $Date: 2016-03-21 14:44:55 -0500 (Mon, 21 Mar 2016) $
 * $Revision: 22017 $
 *
 ******************************************************************************/

/**
 * @file  pt.h
 * @addtogroup pt Pulse Train
 * @brief This is the high level API for the pulse train module
 * @{
 *
 */

#ifndef _PT_H
#define _PT_H

#include "mxc_config.h"
#include "pt_regs.h"
#include "mxc_assert.h"
#include "mxc_sys.h"

#ifdef __cplusplus
extern "C" {
#endif

/// @struct pt_pt_cfg_t
/// Pulse train mode configuration structure. @note Do not use for square wave
typedef struct {
    uint32_t bps;           ///< pulse train bit rate
    uint32_t pattern;       ///< Output pattern to shift out, starts at LSB
    uint8_t ptLength;       ///< Number of bits in pulse train, 0 = 32bits, 1 = non valid , 2 = 2 bits, ...
    uint16_t loop;          ///< Number of times to repeat the train, 0 = continuous
    uint16_t loopDelay;     ///< Delay between loops specified in bits Example: loopDelay = 4,  delays time  = time it takes to shift out 4 bits
} pt_pt_cfg_t;

/**
 * @brief This function initializes pulse train modules to a known stopped state
 *        and sets the global PT clock scale
 * @param clk_scale scale the system clock for the global PT clock
 */
void PT_Init(sys_pt_clk_scale clk_scale);

/**
 * @brief   Configures the pulse train in the specified mode.
 * @details The parameters in config structure must be set before calling this function.
 *          This function should be used for configuring pulse train mode only.
 * @note    The pulse train cannot be running when this function is called
 *
 * @param   pt      pulse train to operate on
 * @param   cfg     pointer to pulse train configuration
 * @param   sysCfg  pointer to pulse train system GPIO configuration
 *
 * @returns E_NO_ERROR if everything is successful, error if unsuccessful.
 */
int PT_PTConfig(mxc_pt_regs_t *pt, pt_pt_cfg_t *cfg, const sys_cfg_pt_t *sysCfg);

/**
 * @brief   Configures the pulse train in the square wave mode.
 * @details This function should be used for configuring square wave mode only.
 * @note    The pulse train cannot be running when this function is called
 *
 * @param   pt      pulse train to operate on
 * @param   freq    square wave output frequency in Hz
 * @param   sysCfg  pointer to pulse train system GPIO configuration
 *
 * @returns E_NO_ERROR if everything is successful, error if unsuccessful.
 */
int PT_SqrWaveConfig(mxc_pt_regs_t *pt, uint32_t freq, const sys_cfg_pt_t *sysCfg);

/**
 * @brief   Starts the pulse train specified
 *
 * @param   pt      pulse train to operate on
 */
__STATIC_INLINE void PT_Start(mxc_pt_regs_t *pt)
{
    int ptIndex = MXC_PT_GET_IDX(pt);

    MXC_PTG->enable |= (1 << ptIndex);

    //wait for PT to start
    while( (MXC_PTG->enable & (1 << ptIndex)) == 0 );
}

/**
 * @brief   Start multiple pulse train modules together.
 *
 * @param   pts     set the bits of pulse trains to start
 *                  Bit0-\>pt0, Bit1-\>pt1... etc.
 */
__STATIC_INLINE void PT_StartMulti(uint32_t pts)
{
    MXC_PTG->enable |= pts;

    //wait for PTs to start
    while( (MXC_PTG->enable & pts) != pts );
}

/**
 * @brief   Stops a pulse train
 *
 * @param   pt      pulse train to operate on
 */
__STATIC_INLINE void PT_Stop(mxc_pt_regs_t *pt)
{
    int ptIndex = MXC_PT_GET_IDX(pt);

    MXC_PTG->enable &= ~(1 << ptIndex);
}

/**
 * @brief   Stop multiple pulse trains together
 *
 * @param   pts     set the bits of pulse trains to stop
 *                  Bit0-\>pt0, Bit1-\>pt1... etc.
 */
__STATIC_INLINE void PT_StopMulti(uint32_t pts)
{
    MXC_PTG->enable &= ~(pts);
}

/**
 * @brief   Determines if the pulse train is running
 *
 * @param   pt      pulse train to operate on
 *
 * @return  0 = pulse train is off, non-zero = pulse train is on
 */
__STATIC_INLINE uint32_t PT_IsActive(mxc_pt_regs_t *pt)
{
    int ptIndex = MXC_PT_GET_IDX(pt);

    return (!!(MXC_PTG->enable & (1 << ptIndex)));
}

/**
 * @brief   Determines if the pulse trains selected are running
 *
 * @param   pts     set the bits of pulse trains to check
 *                  Bit0-\>pt0, Bit1-\>pt1... etc.
 *
 * @return  0 = all pulse trains are off, non-zero = at least one pulse train is on
 */
__STATIC_INLINE uint32_t PT_IsActiveMulti(uint32_t pts)
{
    return (MXC_PTG->enable & pts);
}

/**
 * @brief   Sets the pattern of the pulse train
 *
 * @param   pt      Pointer to pulse train to operate on
 * @param   pattern output pattern
 *
 */
__STATIC_INLINE void PT_SetPattern(mxc_pt_regs_t *pt, uint32_t pattern)
{
    pt->train = pattern;
}

/**
 * @brief   Enable pulse train interrupt
 *
 * @param   pts     Pointer to pulse train to operate on
 */
__STATIC_INLINE void PT_EnableINT(mxc_pt_regs_t *pt)
{
    int ptIndex = MXC_PT_GET_IDX(pt);

    MXC_PTG->inten |= (1 << ptIndex);
}

/**
 * @brief   Enable interrupts for the pulse trains selected
 *
 * @param   pts     set the bits of pulse trains to enable
 *                  Bit0-\>pt0, Bit1-\>pt1... etc.
 */
__STATIC_INLINE void PT_EnableINTMulti(uint32_t pts)
{
    MXC_PTG->inten |= pts;
}

/**
 * @brief   Disable pulse train interrupt
 *
 * @param   pts     pulse train to operate on
 */
__STATIC_INLINE void PT_DisableINT(mxc_pt_regs_t *pt)
{
    int ptIndex = MXC_PT_GET_IDX(pt);

    MXC_PTG->inten &= ~(1 << ptIndex);
}

/**
 * @brief   Disable interrupts for the pulse trains selected
 *
 * @param   pts     set the bits of pulse trains to enable
 *                  Bit0-\>pt0, Bit1-\>pt1... etc.
 */
__STATIC_INLINE void PT_DisableINTMulti(uint32_t pts)
{
    MXC_PTG->inten &= ~pts;
}
/**
 * @brief   Gets the pulse trains's interrupt flags
 *
 * @return  The Pulse Train Flags, bits that are 1 are set.
 */
__STATIC_INLINE uint32_t PT_GetFlags(void)
{
    return MXC_PTG->intfl;
}

/**
 * @brief   Clears the pulse train's interrupt flag
 *
 * @param   mask    bits to clear
 *
 */
__STATIC_INLINE void PT_ClearFlags(uint32_t mask)
{
    MXC_PTG->intfl = mask;
}

/**
 * @brief   Setup and enables a pulse train to restart after another pulse train has exited its loop.
 *          Each pulse train can have up to two restart triggers.
 *
 * @param   ptToRestart     pulse train to restart after \a ptStop ends
 * @param   ptStop          pulse train that stops and triggers \a ptToRestart to begin
 * @param   restartIndex    selects which restart trigger to set (0 or 1)
 */
__STATIC_INLINE void PT_SetRestart(mxc_pt_regs_t *ptToRestart, mxc_pt_regs_t *ptStop, uint8_t restartIndex)
{
    int ptStopIndex = MXC_PT_GET_IDX(ptStop);

    MXC_ASSERT(ptStopIndex >= 0);

    if(restartIndex) {
        ptToRestart->restart |= (ptStopIndex << MXC_F_PT_RESTART_PT_Y_SELECT_POS) |
                                MXC_F_PT_RESTART_ON_PT_Y_LOOP_EXIT;
    } else {
        ptToRestart->restart |= (ptStopIndex << MXC_F_PT_RESTART_PT_X_SELECT_POS) |
                                MXC_F_PT_RESTART_ON_PT_X_LOOP_EXIT;
    }
}

/**
 * @brief   Disable the restart for the specified pulse train
 *
 * @param   ptToRestart     pulse train to disable the restart
 * @param   restartIndex    selects which restart trigger to disable (0 or 1)
 */
__STATIC_INLINE void PT_RestartDisable(mxc_pt_regs_t *ptToRestart, uint8_t restartIndex)
{
    if(restartIndex)
        ptToRestart->restart &= ~MXC_F_PT_RESTART_ON_PT_Y_LOOP_EXIT;
    else
        ptToRestart->restart &= ~MXC_F_PT_RESTART_ON_PT_X_LOOP_EXIT;
}

/**
 * @brief   Resynchronize individual pulse trains together.
 *          Resync will stop those resync_pts; others will be still running
 *
 * @param   resyncPts       pulse train modules that need to be re-synced by bit number.
 *                          Bit0-\>pt0, Bit1-\>pt1... etc.
 */
__STATIC_INLINE void PT_Resync(uint32_t resyncPts)
{
    MXC_PTG->resync = resyncPts;
    while(MXC_PTG->resync);
}

/**@}*/
#ifdef __cplusplus
}
#endif

#endif /* _PT_H_ */