SdSpiCard Class Reference

Raw access to SD and SDHC flash memory cards via SPI protocol. More...

`#include <SdSpiCard.h>`

Inheritance diagram for SdSpiCard:
[legend]

## Public Member Functions

bool | begin (SdSpiDriver *spi, uint8_t csPin, SPISettings spiSettings)
uint32_t | cardSize ()
bool | erase (uint32_t firstBlock, uint32_t lastBlock)
bool | eraseSingleBlockEnable ()
void | error (uint8_t code)
int | errorCode () const
int | errorData () const
bool | isBusy ()
bool | readBlock (uint32_t lba, uint8_t *dst)
bool | readBlocks (uint32_t lba, uint8_t *dst, size_t nb)
bool | readCID (cid_t *cid)
bool | readCSD (csd_t *csd)
bool | readData (uint8_t *dst)
bool | readOCR (uint32_t *ocr)
bool | readStart (uint32_t blockNumber)
bool | readStatus (uint8_t *status)
bool | readStop ()
| SdSpiCard ()
void | spiStart ()
void | spiStop ()
bool | syncBlocks ()
int | type () const
bool | writeBlock (uint32_t lba, const uint8_t *src)
bool | writeBlocks (uint32_t lba, const uint8_t *src, size_t nb)
bool | writeData (const uint8_t *src)
bool | writeStart (uint32_t blockNumber)
bool | writeStart (uint32_t blockNumber, uint32_t eraseCount)
bool | writeStop ()

## Detailed Description

Raw access to SD and SDHC flash memory cards via SPI protocol.

## Constructor & Destructor Documentation

## SdSpiCard()

SdSpiCard::SdSpiCard | ( |  | ) |

inline

Construct an instance of SdSpiCard.

## Member Function Documentation

## begin()

bool SdSpiCard::begin | ( | SdSpiDriver * | spi,
|  | uint8_t | csPin,
|  | SPISettings | spiSettings
| ) |  |

Initialize the SD card.

Parameters

  [in] | spi | SPI driver for card.
  [in] | csPin | card chip select pin.
  [in] | spiSettings | SPI speed, mode, and bit order.

Returns
  true for success else false.

## cardSize()

uint32_t SdSpiCard::cardSize | ( |  | ) |

Determine the size of an SD flash memory card.

Returns
  The number of 512 byte data blocks in the card or zero if an error occurs.

## erase()

bool SdSpiCard::erase | ( | uint32_t | firstBlock,
|  | uint32_t | lastBlock
| ) |  |

Erase a range of blocks.

Parameters

  [in] | firstBlock | The address of the first block in the range.
  [in] | lastBlock | The address of the last block in the range.

Note
  This function requests the SD card to do a flash erase for a range of blocks. The data on the card after an erase operation is either 0 or 1, depends on the card vendor. The card must support single block erase.

Returns
  The value true is returned for success and the value false is returned for failure.

## eraseSingleBlockEnable()

bool SdSpiCard::eraseSingleBlockEnable | ( |  | ) |

Determine if card supports single block erase.

Returns
  true is returned if single block erase is supported. false is returned if single block erase is not supported.

## error()

void SdSpiCard::error | ( | uint8_t | code | ) |

inline

Set SD error code.

Parameters

  [in] | code | value for error code.

## errorCode()

int SdSpiCard::errorCode | ( |  | ) | const

inline

Returns
  code for the last error. See SdInfo.h for a list of error codes.

## errorData()

int SdSpiCard::errorData | ( |  | ) | const

inline

Returns
  error data for last error.

## isBusy()

bool SdSpiCard::isBusy | ( |  | ) |

Check for busy. MISO low indicates the card is busy.

Returns
  true if busy else false.

## readBlock()

bool SdSpiCard::readBlock | ( | uint32_t | lba,
|  | uint8_t * | dst
| ) |  |

Read a 512 byte block from an SD card.

Parameters

  [in] | lba | Logical block to be read.
  [out] | dst | Pointer to the location that will receive the data.

Returns
  The value true is returned for success and the value false is returned for failure.

## readBlocks()

bool SdSpiCard::readBlocks | ( | uint32_t | lba,
|  | uint8_t * | dst,
|  | size_t | nb
| ) |  |

Read multiple 512 byte blocks from an SD card.

Parameters

  [in] | lba | Logical block to be read.
  [in] | nb | Number of blocks to be read.
  [out] | dst | Pointer to the location that will receive the data.

Returns
  The value true is returned for success and the value false is returned for failure.

## readCID()

bool SdSpiCard::readCID | ( | cid_t * | cid | ) |

inline

Read a card's CID register. The CID contains card identification information such as Manufacturer ID, Product name, Product serial number and Manufacturing date.

Parameters

  [out] | cid | pointer to area for returned data.

Returns
  true for success or false for failure.

## readCSD()

bool SdSpiCard::readCSD | ( | csd_t * | csd | ) |

inline

Read a card's CSD register. The CSD contains Card-Specific Data that provides information regarding access to the card's contents.

Parameters

  [out] | csd | pointer to area for returned data.

Returns
  true for success or false for failure.

## readData()

bool SdSpiCard::readData | ( | uint8_t * | dst | ) |

Read one data block in a multiple block read sequence

Parameters

  [out] | dst | Pointer to the location for the data to be read.

Returns
  The value true is returned for success and the value false is returned for failure.

## readOCR()

bool SdSpiCard::readOCR | ( | uint32_t * | ocr | ) |

Read OCR register.

Parameters

  [out] | ocr | Value of OCR register.

Returns
  true for success else false.

## readStart()

bool SdSpiCard::readStart | ( | uint32_t | blockNumber | ) |

Start a read multiple blocks sequence.

Parameters

  [in] | blockNumber | Address of first block in sequence.

Note
  This function is used with readData() and readStop() for optimized multiple block reads. SPI chipSelect must be low for the entire sequence.

Returns
  The value true is returned for success and the value false is returned for failure.

## readStatus()

bool SdSpiCard::readStatus | ( | uint8_t * | status | ) |

Return the 64 byte card status

Parameters

  [out] | status | location for 64 status bytes.

Returns
  The value true is returned for success and the value false is returned for failure.

## readStop()

bool SdSpiCard::readStop | ( |  | ) |

End a read multiple blocks sequence.

Returns
  The value true is returned for success and the value false is returned for failure.

## spiStart()

void SdSpiCard::spiStart | ( |  | ) |

Set CS low and activate the card.

## spiStop()

void SdSpiCard::spiStop | ( |  | ) |

Set CS high and deactivate the card.

## syncBlocks()

bool SdSpiCard::syncBlocks | ( |  | ) |

inline

Returns
  success if sync successful. Not for user apps.

## type()

int SdSpiCard::type | ( |  | ) | const

inline

Return the card type: SD V1, SD V2 or SDHC

Returns
  0 - SD V1, 1 - SD V2, or 3 - SDHC.

## writeBlock()

bool SdSpiCard::writeBlock | ( | uint32_t | lba,
|  | const uint8_t * | src
| ) |  |

Writes a 512 byte block to an SD card.

Parameters

  [in] | lba | Logical block to be written.
  [in] | src | Pointer to the location of the data to be written.

Returns
  The value true is returned for success and the value false is returned for failure.

## writeBlocks()

bool SdSpiCard::writeBlocks | ( | uint32_t | lba,
|  | const uint8_t * | src,
|  | size_t | nb
| ) |  |

Write multiple 512 byte blocks to an SD card.

Parameters

  [in] | lba | Logical block to be written.
  [in] | nb | Number of blocks to be written.
  [in] | src | Pointer to the location of the data to be written.

Returns
  The value true is returned for success and the value false is returned for failure.

## writeData()

bool SdSpiCard::writeData | ( | const uint8_t * | src | ) |

Write one data block in a multiple block write sequence.

Parameters

  [in] | src | Pointer to the location of the data to be written.

Returns
  The value true is returned for success and the value false is returned for failure.

## writeStart() [1/2]

bool SdSpiCard::writeStart | ( | uint32_t | blockNumber | ) |

Start a write multiple blocks sequence.

Parameters

  [in] | blockNumber | Address of first block in sequence.

Note
  This function is used with writeData() and writeStop() for optimized multiple block writes.

Returns
  The value true is returned for success and the value false is returned for failure.

## writeStart() [2/2]

bool SdSpiCard::writeStart | ( | uint32_t | blockNumber,
|  | uint32_t | eraseCount
| ) |  |

Start a write multiple blocks sequence with pre-erase.

Parameters

  [in] | blockNumber | Address of first block in sequence.
  [in] | eraseCount | The number of blocks to be pre-erased.

Note
  This function is used with writeData() and writeStop() for optimized multiple block writes.

Returns
  The value true is returned for success and the value false is returned for failure.

## writeStop()

bool SdSpiCard::writeStop | ( |  | ) |

End a write multiple blocks sequence.

Returns
  The value true is returned for success and the value false is returned for failure.

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

- Arduino/libraries/SdFat/src/SdCard/SdSpiCard.h
- Arduino/libraries/SdFat/src/SdCard/SdSpiCard.cpp