diff options
Diffstat (limited to 'LUFA/Drivers/Board/USBKEY/Dataflash.h')
| -rw-r--r-- | LUFA/Drivers/Board/USBKEY/Dataflash.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/LUFA/Drivers/Board/USBKEY/Dataflash.h b/LUFA/Drivers/Board/USBKEY/Dataflash.h index a87dfd0ae..b81510f0c 100644 --- a/LUFA/Drivers/Board/USBKEY/Dataflash.h +++ b/LUFA/Drivers/Board/USBKEY/Dataflash.h @@ -88,6 +88,44 @@ #define DATAFLASH_PAGES 8192 /* Inline Functions: */ + /** Initializes 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 @@ -110,6 +148,28 @@ 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. * |