221 lines
8.7 KiB
C
221 lines
8.7 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2012.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief LUFA Custom Board Dataflash Hardware Driver (Template)
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*
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* This is a stub driver header file, for implementing custom board
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* layout hardware with compatible LUFA board specific drivers. If
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* the library is configured to use the BOARD_USER board mode, this
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* driver file should be completed and copied into the "/Board/" folder
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* inside the application's folder.
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*
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* This stub is for the board-specific component of the LUFA Dataflash
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* driver.
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*/
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#ifndef __DATAFLASH_USER_H__
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#define __DATAFLASH_USER_H__
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/* Includes: */
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// TODO: Add any required includes here
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_DATAFLASH_H)
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#error Do not include this file directly. Include LUFA/Drivers/Board/Dataflash.h instead.
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#endif
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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/* Macros: */
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#define DATAFLASH_CHIPCS_MASK // TODO: Replace this with a mask of all the /CS pins of all Dataflashes
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#define DATAFLASH_CHIPCS_DDR // TODO: Replace with the DDR register name for the board's Dataflash ICs
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#define DATAFLASH_CHIPCS_PORT // TODO: Replace with the PORT register name for the board's Dataflash ICs
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Constant indicating the total number of dataflash ICs mounted on the selected board. */
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#define DATAFLASH_TOTALCHIPS 1 // TODO: Replace with the number of Dataflashes on the board, max 2
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/** Mask for no dataflash chip selected. */
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#define DATAFLASH_NO_CHIP DATAFLASH_CHIPCS_MASK
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/** Mask for the first dataflash chip selected. */
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#define DATAFLASH_CHIP1 // TODO: Replace with mask to hold /CS of first Dataflash low, and all others high
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/** Mask for the second dataflash chip selected. */
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#define DATAFLASH_CHIP2 // TODO: Replace with mask to hold /CS of second Dataflash low, and all others high
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/** Internal main memory page size for the board's dataflash ICs. */
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#define DATAFLASH_PAGE_SIZE // TODO: Replace with the page size for the Dataflash ICs
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/** Total number of pages inside each of the board's dataflash ICs. */
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#define DATAFLASH_PAGES // TODO: Replace with the total number of pages inside one of the Dataflash ICs
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/* Inline Functions: */
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/** Initializes the dataflash driver so that commands and data may be sent to an attached dataflash IC.
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* The microcontroller's SPI driver MUST be initialized before any of the dataflash commands are used.
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*/
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static inline void Dataflash_Init(void)
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{
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DATAFLASH_CHIPCS_DDR |= DATAFLASH_CHIPCS_MASK;
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DATAFLASH_CHIPCS_PORT |= DATAFLASH_CHIPCS_MASK;
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}
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/** Sends a byte to the currently selected dataflash IC, and returns a byte from the dataflash.
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*
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* \param[in] Byte Byte of data to send to the dataflash
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*
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* \return Last response byte from the dataflash
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*/
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static inline uint8_t Dataflash_TransferByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
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static inline uint8_t Dataflash_TransferByte(const uint8_t Byte)
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{
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// TODO
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}
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/** Sends a byte to the currently selected dataflash IC, and ignores the next byte from the dataflash.
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*
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* \param[in] Byte Byte of data to send to the dataflash
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*/
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static inline void Dataflash_SendByte(const uint8_t Byte) ATTR_ALWAYS_INLINE;
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static inline void Dataflash_SendByte(const uint8_t Byte)
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{
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// TODO
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}
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/** Sends a dummy byte to the currently selected dataflash IC, and returns the next byte from the dataflash.
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*
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* \return Last response byte from the dataflash
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*/
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static inline uint8_t Dataflash_ReceiveByte(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
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static inline uint8_t Dataflash_ReceiveByte(void)
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{
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// TODO
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}
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/** Determines the currently selected dataflash chip.
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*
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* \return Mask of the currently selected Dataflash chip, either \ref DATAFLASH_NO_CHIP if no chip is selected
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* or a DATAFLASH_CHIPn mask (where n is the chip number).
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*/
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static inline uint8_t Dataflash_GetSelectedChip(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
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static inline uint8_t Dataflash_GetSelectedChip(void)
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{
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return (DATAFLASH_CHIPCS_PORT & DATAFLASH_CHIPCS_MASK);
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}
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/** Selects the given dataflash chip.
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*
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* \param[in] ChipMask Mask of the Dataflash IC to select, in the form of DATAFLASH_CHIPn mask (where n is
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* the chip number).
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*/
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static inline void Dataflash_SelectChip(const uint8_t ChipMask) ATTR_ALWAYS_INLINE;
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static inline void Dataflash_SelectChip(const uint8_t ChipMask)
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{
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DATAFLASH_CHIPCS_PORT = ((DATAFLASH_CHIPCS_PORT & ~DATAFLASH_CHIPCS_MASK) | ChipMask);
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}
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/** Deselects the current dataflash chip, so that no dataflash is selected. */
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static inline void Dataflash_DeselectChip(void) ATTR_ALWAYS_INLINE;
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static inline void Dataflash_DeselectChip(void)
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{
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Dataflash_SelectChip(DATAFLASH_NO_CHIP);
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}
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/** Selects a dataflash IC from the given page number, which should range from 0 to
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* ((DATAFLASH_PAGES * DATAFLASH_TOTALCHIPS) - 1). For boards containing only one
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* dataflash IC, this will select DATAFLASH_CHIP1. If the given page number is outside
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* the total number of pages contained in the boards dataflash ICs, all dataflash ICs
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* are deselected.
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*
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* \param[in] PageAddress Address of the page to manipulate, ranging from
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* 0 to ((DATAFLASH_PAGES * DATAFLASH_TOTALCHIPS) - 1).
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*/
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static inline void Dataflash_SelectChipFromPage(const uint16_t PageAddress)
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{
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Dataflash_DeselectChip();
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if (PageAddress >= (DATAFLASH_PAGES * DATAFLASH_TOTALCHIPS))
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return;
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#if (DATAFLASH_TOTALCHIPS == 2)
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if (PageAddress & 0x01)
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Dataflash_SelectChip(DATAFLASH_CHIP2);
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else
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Dataflash_SelectChip(DATAFLASH_CHIP1);
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#else
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Dataflash_SelectChip(DATAFLASH_CHIP1);
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#endif
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}
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/** Toggles the select line of the currently selected dataflash IC, so that it is ready to receive
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* a new command.
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*/
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static inline void Dataflash_ToggleSelectedChipCS(void)
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{
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uint8_t SelectedChipMask = Dataflash_GetSelectedChip();
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Dataflash_DeselectChip();
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Dataflash_SelectChip(SelectedChipMask);
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}
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/** Spin-loops while the currently selected dataflash is busy executing a command, such as a main
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* memory page program or main memory to buffer transfer.
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*/
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static inline void Dataflash_WaitWhileBusy(void)
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{
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Dataflash_ToggleSelectedChipCS();
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Dataflash_SendByte(DF_CMD_GETSTATUS);
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while (!(Dataflash_ReceiveByte() & DF_STATUS_READY));
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Dataflash_ToggleSelectedChipCS();
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}
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/** Sends a set of page and buffer address bytes to the currently selected dataflash IC, for use with
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* dataflash commands which require a complete 24-bit address.
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*
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* \param[in] PageAddress Page address within the selected dataflash IC
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* \param[in] BufferByte Address within the dataflash's buffer
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*/
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static inline void Dataflash_SendAddressBytes(uint16_t PageAddress, const uint16_t BufferByte)
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{
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#if (DATAFLASH_TOTALCHIPS == 2)
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PageAddress >>= 1;
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#endif
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Dataflash_SendByte(PageAddress >> 5);
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Dataflash_SendByte((PageAddress << 3) | (BufferByte >> 8));
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Dataflash_SendByte(BufferByte);
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}
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#endif
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