/* ---------------------------------------------------------------------------- */
/*                  Atmel Microcontroller Software Support                      */
/*                       SAM Software Package License                           */
/* ---------------------------------------------------------------------------- */
/* Copyright (c) 2015, Atmel Corporation                                        */
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/*                                                                              */
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/* ---------------------------------------------------------------------------- */

#ifndef _TWID_
#define _TWID_

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

#include "chip.h"

#include <stdint.h>

/*----------------------------------------------------------------------------
 *        Definition
 *----------------------------------------------------------------------------*/

/** TWI driver is currently busy. */
#define TWID_ERROR_BUSY              1

/** Transfer is still pending.*/
#define ASYNC_STATUS_PENDING        0xFF
#ifdef __cplusplus
extern "C" {
#endif

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

/*----------------------------------------------------------------------------
*        Type
*----------------------------------------------------------------------------*/
/** \brief Asynchronous transfer descriptor. */
typedef struct _Async {
	/** Asynchronous transfer status.*/
	volatile uint32_t status;
	/** Callback function to invoke when transfer completes or fails.*/
	void *callback;
	/** Driver storage area; do not use.*/
	uint8_t pStorage[9];
} Async;

/** \brief TWI driver structure. Holds the internal state of the driver.*/
typedef struct _Twid {
	/** Pointer to the underlying TWI peripheral.*/
	Twihs *pTwi;
	/** Current asynchronous transfer being processed.*/
	Async *pTransfer;
} Twid;

/** \brief TWI driver structure. Holds the internal state of the driver.*/
typedef struct {
	uint8_t Twi_id;
	/** Pointer to the underlying TWI driver.*/
	Twid *pTwid;
	/** Pointer to the underlying DMA driver for TWI.*/
	sXdmad *pTwiDma;
} TwihsDma;

/*----------------------------------------------------------------------------
 *        Export functions
 *----------------------------------------------------------------------------*/
extern void TWID_Initialize(Twid *pTwid, Twihs *pTwi);
extern void TWID_DmaInitialize(TwihsDma *pTwidma, Twihs *pTwi,
							   uint8_t bPolling);

extern void TWID_Handler(Twid *pTwid);

extern uint32_t ASYNC_IsFinished(Async *pAsync);

extern uint8_t TWID_Read(
	Twid *pTwid,
	uint8_t address,
	uint32_t iaddress,
	uint8_t isize,
	uint8_t *pData,
	uint32_t num,
	Async *pAsync);

extern uint8_t TWID_Write(
	Twid *pTwid,
	uint8_t address,
	uint32_t iaddress,
	uint8_t isize,
	uint8_t *pData,
	uint32_t num,
	Async *pAsync);

extern uint8_t TWID_DmaRead(
	TwihsDma *pTwiXdma,
	uint8_t address,
	uint32_t iaddress,
	uint8_t isize,
	uint8_t *pData,
	uint32_t num,
	Async *pAsync);

extern uint8_t TWID_DmaWrite(
	TwihsDma *pTwiXdma,
	uint8_t address,
	uint32_t iaddress,
	uint8_t isize,
	uint8_t *pData,
	uint32_t num,
	Async *pAsync);

#ifdef __cplusplus
}
#endif

#endif //#ifndef TWID_H