Low Level MMC Interface
[Block Devices]

Collaboration diagram for Low Level MMC Interface:

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Detailed Description

Bit banging SPI for MMC.

Data Structures
struct	_MMCDCB
	Private data of NPL card interface. More...
Defines
#define	SPI0_CS_BIT   6
	Port bit for SPI chip select.
#define	SPI0_CLK_BIT   4
	Port bit for SPI clock.
#define	SPI0_MOSI_BIT   5
	Port bit for SPI MOSI line.
#define	SPI0_MISO_BIT   3
	Port bit for SPI MISO line.
#define	MMC0_CLR_BIT(n)   outr(SPI0_SOD_REG, inr(SPI0_SOD_REG) & ~_BV(n))
#define	MMC0_SET_BIT(n)   outr(SPI0_SOD_REG, inr(SPI0_SOD_REG) | _BV(n))
#define	MMC0_IS_BIT_SET(n)   ((inr(SPI0_SOD_REG) & _BV(n)) == _BV(n))
#define	MMC0_TST_BIT(n)   ((inr(SPI0_PDS_REG) & _BV(n)) == _BV(n))
	Query status of a specified MMC input.
Typedefs
typedef _MMCDCB	MMCDCB
	Private data of NPL card interface.
Functions
int	SbiMmCard0Avail (void)
	Check if card is available in slot 0.
int	SbiMmCard0WrProt (void)
	Check if card in slot 0 is write protected.
Variables
NUTDEVICE	devSbiMmc0
	Multimedia card device information structure.

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Function Documentation

int SbiMmCard0Avail (  void   )

Check if card is available in slot 0. Todo: Card change should verify the card identifier. Right now any detection of removing and re-inserting a card counts as a card change. Returns: 0 if no card is detected, 1 if a card is available or 2 if a card change had been detected after the last mount.

int SbiMmCard0WrProt (  void   )

Check if card in slot 0 is write protected. Todo: Not implemented. Returns: Always 0.

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Variable Documentation

NUTDEVICE devSbiMmc0

Initial value: { 0, {'M', 'M', 'C', '0', 0, 0, 0, 0, 0} , 0, 0, 0, &mmc0_ifc, &mmc0_dcb, SbiMmcIfcInit, MmCardIOCtl, MmCardBlockRead, MmCardBlockWrite, MmCardBlockWrite_P, MmCardMount, MmCardUnmount, 0 } Multimedia card device information structure. A pointer to this structure must be passed to NutRegisterDevice() to bind this driver to the Nut/OS kernel. An application may then call /verbatim _open("MMC0:", _O_RDWR | _O_BINARY); /endverbatim to mount the first active primary partition with any previously registered file system driver (typically devPhat0).

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