daisy::SdmmcHandler Class Reference

Detailed Description

Configuration for interfacing with SD cards. Currently only supports operation using FatFS filesystem

Only SDMMC1 is supported at this time.

Pins are fixed to the following: PC12 - SDMMC1 CK PD2 - SDMMC1 CMD PC8 - SDMMC1 D0 PC9 - SDMMC1 D1 (optional) PC10 - SDMMC1 D2 (optional) PC11 - SDMMC1 D3 (optional)

#include <sdmmc.h>

Classes
struct	Config

Public Types
enum class	Result { OK , ERROR }
enum class	BusWidth { BITS_1 , BITS_4 }
enum class	Speed {   SLOW , MEDIUM_SLOW , STANDARD , FAST ,   VERY_FAST }

Public Member Functions
	SdmmcHandler ()
	~SdmmcHandler ()
Result	Init (const Config &cfg)

Member Enumeration Documentation

BusWidth

enum class daisy::SdmmcHandler::BusWidth

strong

Sets whether 4-bit mode or 1-bit mode is used for the SDMMC

Enumerator
BITS_1	Only 1 bit of data per clock is transferred
BITS_4	4-bits of parallel data for each clock pulse

Result

enum class daisy::SdmmcHandler::Result

strong

Return values for the SdmmcHandler class

Enumerator
OK
ERROR

Speed

enum class daisy::SdmmcHandler::Speed

strong

Sets the desired clock speed of the SD card bus.
Initialization is always done at or below 400kHz, and then the user speed is set.

Enumerator
SLOW	400kHz, initialization performed at this rate, before moving to user value
MEDIUM_SLOW	12.5MHz - half of standard rate
STANDARD	25MHz - DS (Default Speed for SDMMC)
FAST	50MHz - HS (High Speed signaling)
VERY_FAST	100MHz - SDR50 Overclocked rate for maximum transfer rates

Constructor & Destructor Documentation

SdmmcHandler()

daisy::SdmmcHandler::SdmmcHandler ( )

inline

~SdmmcHandler()

daisy::SdmmcHandler::~SdmmcHandler ( )

inline

Member Function Documentation

Init()

Result daisy::SdmmcHandler::Init

(

const Config &

cfg

)

Configures the SDMMC Peripheral with the user defined settings. Initialization does not happen immediatly and will be called by the filesystem (i.e. FatFS).

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The documentation for this class was generated from the following file:

• src/per/sdmmc.h