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/**
 * \file
 *
 * Implementation of SPI driver, transfer data through DMA.
 *
 */

#ifndef _SPI_DMA_
#define _SPI_DMA_

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

#include "chip.h"

/*----------------------------------------------------------------------------
 *        Definitions
 *----------------------------------------------------------------------------*/

/** An unspecified error has occurred.*/
#define SPID_ERROR          1

/** SPI driver is currently in use.*/
#define SPID_ERROR_LOCK     2

/*----------------------------------------------------------------------------
 *        Macros
 *----------------------------------------------------------------------------*/

/** Calculates the value of the SCBR field of the Chip Select Register
    given MCK and SPCK.*/
#define SPID_CSR_SCBR(mck, spck)    SPI_CSR_SCBR((mck) / (spck))

/** Calculates the value of the DLYBS field of the Chip Select Register
    given delay in ns and MCK.*/
#define SPID_CSR_DLYBS(mck, delay)  SPI_CSR_DLYBS((((delay) * \
		((mck) / 1000000)) / 1000) + 1)

/** Calculates the value of the DLYBCT field of the Chip Select Register
    given delay in ns and MCK.*/
#define SPID_CSR_DLYBCT(mck, delay) SPI_CSR_DLYBCT((((delay) / 32 * \
		((mck) / 1000000)) / 1000) + 1)

#ifdef __cplusplus
extern "C" {
#endif

/*----------------------------------------------------------------------------
 *        Types
 *----------------------------------------------------------------------------*/

/** SPI transfer complete callback. */
typedef void (*SpidCallback)(uint8_t, void *);

/** \brief Spi Transfer Request prepared by the application upper layer.
 *
 * This structure is sent to the SPI_SendCommand function to start the transfer.
 * At the end of the transfer, the callback is invoked by the interrupt handler.
 */
typedef struct _SpidCmd {
	/** Pointer to the Tx data. */
	uint8_t *pTxBuff;
	/** Tx size in bytes. */
	uint8_t TxSize;
	/** Pointer to the Rx data. */
	uint8_t *pRxBuff;
	/** Rx size in bytes. */
	uint16_t RxSize;
	/** SPI chip select. */
	uint8_t spiCs;
	/** Callback function invoked at the end of transfer. */
	SpidCallback callback;
	/** Callback arguments. */
	void *pArgument;
} SpidCmd;

/** Constant structure associated with SPI port. This structure prevents
    client applications to have access in the same time. */
typedef struct _Spid {
	/** Pointer to SPI Hardware registers */
	Spi *pSpiHw;
	/** Current SpiCommand being processed */
	SpidCmd *pCurrentCommand;
	/** Pointer to DMA driver */
	sXdmad *pXdmad;
	/** SPI Id as defined in the product datasheet */
	uint8_t spiId;
	/** Mutual exclusion semaphore. */
	volatile int8_t semaphore;
} Spid;

/*----------------------------------------------------------------------------
 *        Exported functions
 *----------------------------------------------------------------------------*/

extern uint32_t SPID_Configure(Spid *pSpid,
								Spi *pSpiHw,
								uint8_t spiId,
								uint32_t SpiMode,
								sXdmad *pXdmad);

extern void SPID_ConfigureCS(Spid *pSpid, uint32_t dwCS, uint32_t dwCsr);

extern uint32_t SPID_SendCommand(Spid *pSpid, SpidCmd *pCommand);

extern void SPID_Handler(Spid *pSpid);

extern void SPID_DmaHandler(Spid *pSpid);

extern uint32_t SPID_IsBusy(const Spid *pSpid);

#ifdef __cplusplus
}
#endif

#endif /* #ifndef _SPI_DMA_ */