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Low Level MMC Interface
[Block Devices]

Collaboration diagram for Low Level MMC Interface:


Detailed Description

Bit banging SPI for MMC.


Data Structures

struct  _MMCDCB
 Private data of NPL card interface. More...

Defines

#define SPI0_CS_BIT
 Port bit for SPI chip select.
#define SPI0_CLK_BIT
 Port bit for SPI clock.
#define SPI0_MOSI_BIT
 Port bit for SPI MOSI line.
#define SPI0_MISO_BIT
 Port bit for SPI MISO line.
#define MMC0_CLR_BIT(n)
#define MMC0_SET_BIT(n)
#define MMC0_IS_BIT_SET(n)
#define MMC0_TST_BIT(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.


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.


Variable Documentation

NUTDEVICE devSbiMmc0
 

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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