text: /**
   * Copyright (c) 20011-2017 Bill Greiman
   * This file is part of the SdFat_Gre library for SD memory cards.
   *
   * MIT License
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included
   * in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  #ifndef SdioCard_h
  #define SdioCard_h
  #include "SysCall.h"
  #include "BlockDriver.h"
  /**
   * \class SdioCard
   * \brief Raw SDIO access to SD and SDHC flash memory cards.
   */
  class SdioCard : public BaseBlockDriver {
   public:
    /** Initialize the SD card.
     * \return true for success else false.
     */
    bool begin();
    /**
     * Determine the size of an SD flash memory card.
     *
     * \return The number of 512 byte data blocks in the card
     *         or zero if an error occurs.
     */
    uint32_t cardSize();
    /** Erase a range of blocks.
     *
     * \param[in] firstBlock The address of the first block in the range.
     * \param[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.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool erase(uint32_t firstBlock, uint32_t lastBlock);
    /**
     * \return code for the last error. See SdInfo_Gre.h for a list of error codes.
     */
    uint8_t errorCode();
    /** \return error data for last error. */
    uint32_t errorData();
    /** \return error line for last error. Tmp function for debug. */
    uint32_t errorLine();
    /**
     * Check for busy with CMD13.
     *
     * \return true if busy else false.
     */
    bool isBusy();
    /** \return the SD clock frequency in kHz. */
    uint32_t kHzSdClk();
    /**
     * Read a 512 byte block from an SD card.
     *
     * \param[in] lba Logical block to be read.
     * \param[out] dst Pointer to the location that will receive the data.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readBlock(uint32_t lba, uint8_t* dst);
    /**
     * Read multiple 512 byte blocks from an SD card.
     *
     * \param[in] lba Logical block to be read.
     * \param[in] nb Number of blocks to be read.
     * \param[out] dst Pointer to the location that will receive the data.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readBlocks(uint32_t lba, uint8_t* dst, size_t nb);
    /**
     * Read a card's CID register. The CID contains card identification
     * information such as Manufacturer ID, Product name, Product serial
     * number and Manufacturing date.
     *
     * \param[out] cid pointer to area for returned data.
     *
     * \return true for success or false for failure.
     */
    bool readCID(void* cid);
    /**
     * Read a card's CSD register. The CSD contains Card-Specific Data that
     * provides information regarding access to the card's contents.
     *
     * \param[out] csd pointer to area for returned data.
     *
     * \return true for success or false for failure.
     */
    bool readCSD(void* csd);
    /** Read one data block in a multiple block read sequence
     *
     * \param[out] dst Pointer to the location for the data to be read.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readData(uint8_t *dst);
    /** Read OCR register.
     *
     * \param[out] ocr Value of OCR register.
     * \return true for success else false.
     */
    bool readOCR(uint32_t* ocr);
    /** Start a read multiple blocks sequence.
     *
     * \param[in] lba 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.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readStart(uint32_t lba);
    /** Start a read multiple blocks sequence.
     *
     * \param[in] lba Address of first block in sequence.
     * \param[in] count Maximum block count.
     * \note This function is used with readData() and readStop() for optimized
     * multiple block reads.  SPI chipSelect must be low for the entire sequence.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readStart(uint32_t lba, uint32_t count);
    /** End a read multiple blocks sequence.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readStop();
    /** \return success if sync successful. Not for user apps. */
    bool syncBlocks();
    /** Return the card type: SD V1, SD V2 or SDHC
     * \return 0 - SD V1, 1 - SD V2, or 3 - SDHC.
     */
    uint8_t type();
    /**
     * Writes a 512 byte block to an SD card.
     *
     * \param[in] lba Logical block to be written.
     * \param[in] src Pointer to the location of the data to be written.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeBlock(uint32_t lba, const uint8_t* src);
    /**
     * Write multiple 512 byte blocks to an SD card.
     *
     * \param[in] lba Logical block to be written.
     * \param[in] nb Number of blocks to be written.
     * \param[in] src Pointer to the location of the data to be written.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeBlocks(uint32_t lba, const uint8_t* src, size_t nb);
    /** Write one data block in a multiple block write sequence.
     * \param[in] src Pointer to the location of the data to be written.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeData(const uint8_t* src);
    /** Start a write multiple blocks sequence.
     *
     * \param[in] lba Address of first block in sequence.
     *
     * \note This function is used with writeData() and writeStop()
     * for optimized multiple block writes.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeStart(uint32_t lba);
    /** Start a write multiple blocks sequence.
     *
     * \param[in] lba Address of first block in sequence.
     * \param[in] count Maximum block count.
     * \note This function is used with writeData() and writeStop()
     * for optimized multiple block writes.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeStart(uint32_t lba, uint32_t count);
  
    /** End a write multiple blocks sequence.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeStop();
  };
  //==============================================================================
  /**
   * \class SdioCardEX
   * \brief Extended SD I/O block driver.
   */
  class SdioCardEX : public SdioCard {
   public:
    /** Initialize the SD card
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool begin() {
      m_curState = IDLE_STATE;
      return SdioCard::begin();
    }
    /** Erase a range of blocks.
     *
     * \param[in] firstBlock The address of the first block in the range.
     * \param[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.
     *
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool erase(uint32_t firstBlock, uint32_t lastBlock) {
      return syncBlocks() && SdioCard::erase(firstBlock, lastBlock);
    }
    /**
     * Read a 512 byte block from an SD card.
     *
     * \param[in] block Logical block to be read.
     * \param[out] dst Pointer to the location that will receive the data.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readBlock(uint32_t block, uint8_t* dst);
    /** End multi-block transfer and go to idle state.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool syncBlocks();
    /**
     * Writes a 512 byte block to an SD card.
     *
     * \param[in] block Logical block to be written.
     * \param[in] src Pointer to the location of the data to be written.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeBlock(uint32_t block, const uint8_t* src);
    /**
     * Read multiple 512 byte blocks from an SD card.
     *
     * \param[in] block Logical block to be read.
     * \param[in] nb Number of blocks to be read.
     * \param[out] dst Pointer to the location that will receive the data.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool readBlocks(uint32_t block, uint8_t* dst, size_t nb);
    /**
     * Write multiple 512 byte blocks to an SD card.
     *
     * \param[in] block Logical block to be written.
     * \param[in] nb Number of blocks to be written.
     * \param[in] src Pointer to the location of the data to be written.
     * \return The value true is returned for success and
     * the value false is returned for failure.
     */
    bool writeBlocks(uint32_t block, const uint8_t* src, size_t nb);
  
   private:
    static const uint32_t IDLE_STATE = 0;
    static const uint32_t READ_STATE = 1;
    static const uint32_t WRITE_STATE = 2;
    uint32_t m_curLba;
    uint32_t m_limitLba;
    uint8_t m_curState;
  };
  #endif  // SdioCard_h
  