/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *  \brief Board specific Dataflash driver header for the USBKEY.
 *
 *  Board specific Dataflash driver header for the USBKEY.
 *
 *  \note This file should not be included directly. It is automatically included as needed by the dataflash driver
 *        dispatch header located in LUFA/Drivers/Board/Dataflash.h.
 */

/** \ingroup Group_Dataflash
 *  @defgroup Group_Dataflash_USBKEY USBKEY
 *
 *  Board specific Dataflash driver header for the USBKEY board.
 *
 *  \note This file should not be included directly. It is automatically included as needed by the dataflash driver
 *        dispatch header located in LUFA/Drivers/Board/Dataflash.h. 
 *
 *  @{
 */

#ifndef __DATAFLASH_USBKEY_H__
#define __DATAFLASH_USBKEY_H__

	/* Includes: */
		#include "AT45DB642D.h"

	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_DATAFLASH_H)
			#error Do not include this file directly. Include LUFA/Drivers/Board/Dataflash.h instead.
		#endif
		
	/* Private Interface - For use in library only: */
	#if !defined(__DOXYGEN__)
		/* Macros: */
			#define DATAFLASH_CHIPCS_MASK                ((1 << 1) | (1 << 0))
			#define DATAFLASH_CHIPCS_DDR                 DDRE
			#define DATAFLASH_CHIPCS_PORT                PORTE
	#endif
	
	/* Public Interface - May be used in end-application: */
		/* Macros: */
			/** Constant indicating the total number of dataflash ICs mounted on the selected board. */
			#define DATAFLASH_TOTALCHIPS                 2

			/** Mask for no dataflash chip selected. */
			#define DATAFLASH_NO_CHIP                    DATAFLASH_CHIPCS_MASK

			/** Mask for the first dataflash chip selected. */
			#define DATAFLASH_CHIP1                      (1 << 1)

			/** Mask for the second dataflash chip selected. */
			#define DATAFLASH_CHIP2                      (1 << 0)
			
			/** Internal main memory page size for the board's dataflash ICs. */
			#define DATAFLASH_PAGE_SIZE                  1024

			/** Total number of pages inside each of the board's dataflash ICs. */
			#define DATAFLASH_PAGES                      8192
			
		/* Inline Functions: */
			/** Initialises the dataflash driver so that commands and data may be sent to an attached dataflash IC.
			 *  The AVR's SPI driver MUST be initialized before any of the dataflash commands are used.
			 */
			static inline void Dataflash_Init(void)
			{
				DATAFLASH_CHIPCS_DDR  |= DATAFLASH_CHIPCS_MASK;
				DATAFLASH_CHIPCS_PORT |= DATAFLASH_CHIPCS_MASK;
			}

			/** Determines the currently selected dataflash chip.
			 *
			 *  \return Mask of the currently selected Dataflash chip, either \ref DATAFLASH_NO_CHIP if no chip is selected
			 *  or a DATAFLASH_CHIPn mask (where n is the chip number).
			 */
			static inline uint8_t Dataflash_GetSelectedChip(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
			static inline uint8_t Dataflash_GetSelectedChip(void)
			{
				return (DATAFLASH_CHIPCS_PORT & DATAFLASH_CHIPCS_MASK);
			}

			/** Selects the given dataflash chip.
			 *
			 *  \param[in]  ChipMask  Mask of the Dataflash IC to select, in the form of DATAFLASH_CHIPn mask (where n is
			 *              the chip number).
			 */
			static inline void Dataflash_SelectChip(const uint8_t ChipMask) ATTR_ALWAYS_INLINE;
			static inline void Dataflash_SelectChip(const uint8_t ChipMask)
			{
				DATAFLASH_CHIPCS_PORT = ((DATAFLASH_CHIPCS_PORT & ~DATAFLASH_CHIPCS_MASK) | ChipMask);
			}

			/** Deselects the current dataflash chip, so that no dataflash is selected. */
			static inline void Dataflash_DeselectChip(void) ATTR_ALWAYS_INLINE;
			static inline void Dataflash_DeselectChip(void)
			{
				Dataflash_SelectChip(DATAFLASH_NO_CHIP);
			}
			
			/** Selects a dataflash IC from the given page number, which should range from 0 to
			 *  ((DATAFLASH_PAGES * DATAFLASH_TOTALCHIPS) - 1). For boards containing only one
			 *  dataflash IC, this will select DATAFLASH_CHIP1. If the given page number is outside
			 *  the total number of pages contained in the boards dataflash ICs, all dataflash ICs
			 *  are deselected.
			 *
			 *  \param[in] PageAddress  Address of the page to manipulate, ranging from
			 *                          ((DATAFLASH_PAGES * DATAFLASH_TOTALCHIPS) - 1).
			 */
			static inline void Dataflash_SelectChipFromPage(const uint16_t PageAddress)
			{
				Dataflash_DeselectChip();
				
				if (PageAddress >= (DATAFLASH_PAGES * DATAFLASH_TOTALCHIPS))
				  return;

				if (PageAddress & 0x01)
				  Dataflash_SelectChip(DATAFLASH_CHIP2);
				else
				  Dataflash_SelectChip(DATAFLASH_CHIP1);
			}

			/** Toggles the select line of the currently selected dataflash IC, so that it is ready to receive
			 *  a new command.
			 */
			static inline void Dataflash_ToggleSelectedChipCS(void)
			{
				uint8_t SelectedChipMask = Dataflash_GetSelectedChip();
					
				Dataflash_DeselectChip();
				Dataflash_SelectChip(SelectedChipMask);
			}

			/** Spin-loops while the currently selected dataflash is busy executing a command, such as a main
			 *  memory page program or main memory to buffer transfer.
			 */
			static inline void Dataflash_WaitWhileBusy(void)
			{
				Dataflash_ToggleSelectedChipCS();
				Dataflash_SendByte(DF_CMD_GETSTATUS);
				while (!(Dataflash_ReceiveByte() & DF_STATUS_READY));
				Dataflash_ToggleSelectedChipCS();				
			}

			/** Sends a set of page and buffer address bytes to the currently selected dataflash IC, for use with
			 *  dataflash commands which require a complete 24-byte address.
			 *
			 *  \param[in] PageAddress  Page address within the selected dataflash IC
			 *  \param[in] BufferByte   Address within the dataflash's buffer
			 */
			static inline void Dataflash_SendAddressBytes(uint16_t PageAddress,
			                                              const uint16_t BufferByte)
			{	
				PageAddress >>= 1;
				
				Dataflash_SendByte(PageAddress >> 5);
				Dataflash_SendByte((PageAddress << 3) | (BufferByte >> 8));
				Dataflash_SendByte(BufferByte);
			}		

#endif

/** @} */
