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 *         ATMEL Microcontroller Software Support
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 * Copyright (c) 2010, Atmel Corporation
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/** \addtogroup pio_capture_module Working with PIO Parallel Capture Mode
 * The PIO Parallel Capture Mode driver provides the interface to configure and use the
 * PIO Parallel Capture Mode peripheral.\n
 *
 * The PIO Controller integrates an interface able to read data from a CMOS digital
 * image sensor, a high-speed parallel ADC, a DSP synchronous port in synchronous
 * mode, etc.... For better understanding and to ease reading, the following
 * description uses an example with a CMOS digital image sensor
 *
 * To use the PIO Parallel Capture, the user has to follow these few steps:
 * <ul>
 *   <li> Enable PIOA peripheral clock </li>
 *   <li> Configure the PDC </li>
 *   <li> Configure the PIO Capture interrupt </li>
 *   <li> Enable the PDC </li>
 *   <li> Enable the PIO Capture </li>
 *   <li> Wait for interrupt </li>
 *   <li> Disable the interrupt </li>
 *   <li> Read the DATA </li>
 * </ul>
 *
 * For more accurate information, please look at the PIO Parallel Capture Mode section of the
 * Datasheet.
 *
 * Related files :\n
 * \ref pio_capture.c\n
 * \ref pio_capture.h\n
 */
/*@{*/
/*@}*/
/**
 * \file
 *
 * Implementation of PIO Parallel Capture.
 *
 */

/*----------------------------------------------------------------------------
 *        Headers
 *----------------------------------------------------------------------------*/

#include "chip.h"

#include <stdlib.h>
#include <assert.h>

/*----------------------------------------------------------------------------
 *        Local Functions
 *----------------------------------------------------------------------------*/
/** Copy the API structure for interrupt handler */
static SPioCaptureInit* _PioCaptureCopy ;

/*----------------------------------------------------------------------------
 *        Global Functions
 *----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------*/
/**
 * \brief The PIO_CaptureHandler must be called by the PIO Capture Interrupt
 * Service Routine with the corresponding PIO Capture instance.
 */
/*----------------------------------------------------------------------------*/
extern void PIO_CaptureHandler( void )
{
    volatile uint32_t pio_captureSr;

    /* Read the status register*/
    pio_captureSr = PIOA->PIO_PCISR ;
    pio_captureSr &= PIOA->PIO_PCIMR ;

    if (pio_captureSr & PIO_PCISR_DRDY)
    {
        /* Parallel Capture Mode Data Ready */
        if ( _PioCaptureCopy->CbkDataReady != NULL )
        {
            _PioCaptureCopy->CbkDataReady( _PioCaptureCopy );
        }
        else
        {
//            TRACE_DEBUG("IT PIO Capture Data Ready received (no callback)\n\r");
        }
    }

    if (pio_captureSr & PIO_PCISR_OVRE)
    {
        /* Parallel Capture Mode Overrun Error */
        if ( _PioCaptureCopy->CbkOverrun != NULL )
        {
            _PioCaptureCopy->CbkOverrun( _PioCaptureCopy );
        }
        else
        {
//            TRACE_DEBUG("IT PIO Capture Overrun Error received (no callback)\n\r");
        }
    }

    if (pio_captureSr & PIO_PCISR_RXBUFF)
    {
        /* Reception Buffer Full */
        if ( _PioCaptureCopy->CbkBuffFull != NULL )
        {
            _PioCaptureCopy->CbkBuffFull( _PioCaptureCopy );
        }
        else
        {
//            TRACE_DEBUG("IT PIO Capture Reception Buffer Full received (no callback)\n\r");
        }
    }

    if (pio_captureSr & PIO_PCISR_ENDRX)
    {
        /* End of Reception Transfer */
        if ( _PioCaptureCopy->CbkEndReception != NULL )
        {
            _PioCaptureCopy->CbkEndReception( _PioCaptureCopy );
        }
        else
        {
//            TRACE_DEBUG("IT PIO Capture End of Reception Transfer received (no callback)\n\r");
        }
    }
}

/*----------------------------------------------------------------------------*/
/**
 * \brief Disable Interupt of the PIO Capture
 * \param itToDisable : Interrupt to disable
 */
/*----------------------------------------------------------------------------*/
void PIO_CaptureDisableIt( uint32_t itToDisable )
{
    /* Parallel capture mode is enabled */
    PIOA->PIO_PCIDR = itToDisable;
}

/*----------------------------------------------------------------------------*/
/**
 * \brief Enable Interupt of the PIO Capture
 * \param itToEnable : Interrupt to enable
 */
/*----------------------------------------------------------------------------*/
void PIO_CaptureEnableIt( uint32_t itToEnable )
{
    /* Parallel capture mode is enabled */
    PIOA->PIO_PCIER = itToEnable;
}

/*----------------------------------------------------------------------------*/
/**
 * \brief Enable the PIO Capture
 */
/*----------------------------------------------------------------------------*/
void PIO_CaptureEnable( void )
{
    /* PDC: Receive Pointer Register */
    PIOA->PIO_RPR = (uint32_t)_PioCaptureCopy->pData ;
    /* PDC: Receive Counter Register */
    /* Starts peripheral data transfer if corresponding channel is active */
    PIOA->PIO_RCR = PIO_RCR_RXCTR(_PioCaptureCopy->dPDCsize) ;

    /* Parallel capture mode is enabled */
    PIOA->PIO_PCMR |= PIO_PCMR_PCEN ;
}

/*----------------------------------------------------------------------------*/
/**
 * \brief Disable the PIO Capture
 */
/*----------------------------------------------------------------------------*/
void PIO_CaptureDisable( void )
{
    /* Parallel capture mode is disabled */
    PIOA->PIO_PCMR &= (uint32_t)(~PIO_PCMR_PCEN) ;
}

/*----------------------------------------------------------------------------*/
/**
 * \brief Initialize the PIO Capture
 * Be careful to configure the PDC before enable interrupt on pio capture.
 * Otherway, the pdc will go in interrupt handler continuously.
 * \param dsize :
 *  0 = The reception data in the PIO_PCRHR register is a BYTE (8-bit).
 *  1 = The reception data in the PIO_PCRHR register is a HALF-WORD (16-bit).
 * 2/3 = The reception data in the PIO_PCRHR register is a WORD (32-bit).
 * \param alwaysSampling: ALWYS: Parallel Capture Mode Always Sampling
 * 0 = The parallel capture mode samples the data when both data enables are active.
 * 1 = The parallel capture mode samples the data whatever the data enables are.
 * \param halfSampling: HALFS: Parallel Capture Mode Half Sampling
 * 0 = The parallel capture mode samples all the data.
 * 1 = The parallel capture mode samples the data only one time out of two.
 * \param modeFirstSample: FRSTS: Parallel Capture Mode First Sample
 * This bit is useful only if the HALFS bit is set to 1. If data are numbered
 * in the order that they are received with an index from 0 to n:
 * 0 = Only data with an even index are sampled.
 * 1 = Only data with an odd index are sampled.
 */
/*----------------------------------------------------------------------------*/
void PIO_CaptureInit( SPioCaptureInit *pInit )
{
    PMC_EnablePeripheral( ID_PIOA );

    assert( (pInit->dsize < 0x4) ) ;
    assert( (pInit->dPDCsize <= PIO_RPR_RXPTR_Msk) ) ;
    assert( (pInit->alwaysSampling < 2)  );
    assert( (pInit->halfSampling < 2) );
    assert( (pInit->modeFirstSample < 2) );

    /* PDC: Transfer Control Register */
    /* Disables the PDC transmitter channel requests */
    PIOA->PIO_PTCR = PIO_PTCR_RXTDIS;
    /* PDC: Receive Pointer Register */
    PIOA->PIO_RPR = (uint32_t)pInit->pData;
    /* PDC: Receive Counter Register */
    /* Starts peripheral data transfer if corresponding channel is active */
    PIOA->PIO_RCR = PIO_RCR_RXCTR(pInit->dPDCsize);

    /* PDC: Transfer Control Register */
    /* Enables PDC receiver channel requests if RXTDIS is not set */
    PIOA->PIO_PTCR = PIO_PTCR_RXTEN ;


    /* Copy the API structure for interrupt handler */
    _PioCaptureCopy = pInit;
    /* PIO Parallel Capture Mode */
    PIOA->PIO_PCMR =  PIO_PCMR_DSIZE(pInit->dsize)
                    | ((pInit->alwaysSampling<<9) & PIO_PCMR_ALWYS)
                    | ((pInit->halfSampling<<10) & PIO_PCMR_HALFS)
                    | ((pInit->modeFirstSample<<11) & PIO_PCMR_FRSTS);

    if ( pInit->CbkDataReady != NULL )
    {
        PIOA->PIO_PCIER = PIO_PCISR_DRDY;
    }

    if ( pInit->CbkOverrun != NULL )
    {
        PIOA->PIO_PCIER = PIO_PCISR_OVRE;
    }

    if ( pInit->CbkEndReception != NULL )
    {
        PIOA->PIO_PCIER = PIO_PCISR_ENDRX;
    }

    if ( pInit->CbkBuffFull != NULL )
    {
        PIOA->PIO_PCIER = PIO_PCISR_RXBUFF;
    }
//    else
//    {
//        TRACE_INFO("No interruption, no callback\n\r");
//    }

}