/** Start a write multiple blocks sequence.
 *
 * \param[in] blockNumber Address of first block in sequence.
 * \param[in] eraseCount The number of blocks to be pre-erased.
 *
 * \note This function is used with writeData() and writeStop()
 * for optimized multiple block writes.
 *
 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
uint8_t Sd2Card::writeStart(uint32_t blockNumber, uint32_t eraseCount) {
#if SD_PROTECT_BLOCK_ZERO
  // don't allow write to first block
  if (blockNumber == 0) {
    error(SD_CARD_ERROR_WRITE_BLOCK_ZERO);
    goto fail;
  }
#endif  // SD_PROTECT_BLOCK_ZERO
  // send pre-erase count
  if (cardAcmd(ACMD23, eraseCount)) {
    error(SD_CARD_ERROR_ACMD23);
    goto fail;
  }
  // use address if not SDHC card
  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
  if (cardCommand(CMD25, blockNumber)) {
    error(SD_CARD_ERROR_CMD25);
    goto fail;
  }
  return true;

 fail:
  chipSelectHigh();
  return false;
}

//------------------------------------------------------------------------------
// send one block of data for write block or write multiple blocks
uint8_t Sd2Card::writeData(uint8_t token, const uint8_t* src) {
#ifdef OPTIMIZE_HARDWARE_SPI

  // send data - optimized loop
  SPDR = token;

  // send two byte per iteration
  for (uint16_t i = 0; i < 512; i += 2) {
    while (!(SPSR & (1 << SPIF)));
    SPDR = src[i];
    while (!(SPSR & (1 << SPIF)));
    SPDR = src[i+1];
  }

  // wait for last data byte
  while (!(SPSR & (1 << SPIF)));

#else  // OPTIMIZE_HARDWARE_SPI
  spiSend(token);
  for (uint16_t i = 0; i < 512; i++) {
    spiSend(src[i]);
  }
#endif  // OPTIMIZE_HARDWARE_SPI
  spiSend(0xff);  // dummy crc
  spiSend(0xff);  // dummy crc

  status_ = spiRec();
  if ((status_ & DATA_RES_MASK) != DATA_RES_ACCEPTED) {
    error(SD_CARD_ERROR_WRITE);
    chipSelectHigh();
    return false;
  }
  return true;
}

/**
 * Writes a 512 byte block to an SD card.
 *
 * \param[in] blockNumber Logical block to be written.
 * \param[in] src Pointer to the location of the data to be written.
 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
uint8_t Sd2Card::writeBlock(uint32_t blockNumber, const uint8_t* src)
{
#if SD_PROTECT_BLOCK_ZERO
    // don't allow write to first block
    if (blockNumber == 0)
    {
        error(SD_CARD_ERROR_WRITE_BLOCK_ZERO);
        SerialDebug.println("Error: Write block zero");
        goto fail;
    }
#endif  // SD_PROTECT_BLOCK_ZERO

    // use address if not SDHC card
    if (type() != SD_CARD_TYPE_SDHC)
        blockNumber <<= 9;
    if (cardCommand(CMD24, blockNumber))
    {
        SerialDebug.println("Error: CMD24");
        error(SD_CARD_ERROR_CMD24);
        goto fail;
    }
    if (!writeData(DATA_START_BLOCK, src))
        goto fail;

    // wait for flash programming to complete
    if (!waitNotBusy(SD_WRITE_TIMEOUT))
    {
        error(SD_CARD_ERROR_WRITE_TIMEOUT);
        SerialDebug.println("Error: Write timeout");
        goto fail;
    }
    // response is r2 so get and check two bytes for nonzero
    if (cardCommand(CMD13, 0) || spiRec())
    {
        error(SD_CARD_ERROR_WRITE_PROGRAMMING);
        SerialDebug.println("Error: Write programming");
        goto fail;
    }
    chipSelectHigh();
    return true;

fail:
    chipSelectHigh();
    SerialDebug.println("Error: Sd2Card::writeBlock");
    return false;
}

/** Skip remaining data in a block when in partial block read mode. */
void Sd2Card::readEnd(void) {
  if (inBlock_) {
      // skip data and crc
    while (offset_++ < 514) spiRec();
    chipSelectHigh();
    inBlock_ = 0;
  }
}

/** read CID or CSR register */
uint8_t Sd2Card::readRegister(uint8_t cmd, void* buf) {
  uint8_t* dst = reinterpret_cast<uint8_t*>(buf);
  if (cardCommand(cmd, 0)) {
    error(SD_CARD_ERROR_READ_REG);
    goto fail;
  }
  if (!waitStartBlock()) goto fail;
  // transfer data
  for (uint16_t i = 0; i < 16; i++) dst[i] = spiRec();
  spiRec();  // get first crc byte
  spiRec();  // get second crc byte
  chipSelectHigh();
  return true;

 fail:
  chipSelectHigh();
  return false;
}

/** Start a write multiple blocks sequence.
 *
 * \param[in] blockNumber Address of first block in sequence.
 * \param[in] eraseCount The number of blocks to be pre-erased.
 *
 * \note This function is used with writeData() and writeStop()
 * for optimized multiple block writes.
 *
 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
bool Sd2Card::writeStart(uint32_t blockNumber, uint32_t eraseCount) {
  // send pre-erase count
  if (cardAcmd(ACMD23, eraseCount)) {
    error(SD_CARD_ERROR_ACMD23);
    goto fail;
  }
  // use address if not SDHC card
  if (type() != SD_CARD_TYPE_SDHC) blockNumber <<= 9;
  if (cardCommand(CMD25, blockNumber)) {
    error(SD_CARD_ERROR_CMD25);
    goto fail;
  }
  chipSelectHigh();
  return true;

 fail:
  chipSelectHigh();
  return false;
}

//------------------------------------------------------------------------------
bool Sd2Card::readData(uint8_t* dst, uint16_t count) {
  // wait for start block token
  uint16_t t0 = millis();
  while ((status_ = spiRec()) == 0XFF) {
    if (((uint16_t)millis() - t0) > SD_READ_TIMEOUT) {
      error(SD_CARD_ERROR_READ_TIMEOUT);
      goto fail;
    }
  }
  if (status_ != DATA_START_BLOCK) {
    error(SD_CARD_ERROR_READ);
    goto fail;
  }
  // transfer data
  spiRead(dst, count);

#ifdef SD_CHECK_AND_RETRY
  {
    uint16_t calcCrc = CRC_CCITT(dst, count);
    uint16_t recvCrc = spiRec() << 8;
    recvCrc |= spiRec();
    if (calcCrc != recvCrc)
    {
        error(SD_CARD_ERROR_CRC);
        goto fail;
    }
  }
#else
  // discard CRC
  spiRec();
  spiRec();
#endif
  chipSelectHigh();
  // Send an additional dummy byte, required by Toshiba Flash Air SD Card
  spiSend(0XFF);
  return true;

 fail:
  chipSelectHigh();
  // Send an additional dummy byte, required by Toshiba Flash Air SD Card
  spiSend(0XFF);
  return false;
}

/** End a write multiple blocks sequence.

    \return The value one, true, is returned for success and
    the value zero, false, is returned for failure.
*/
uint8_t Sd2Card::writeStop(void)
{
    if (!waitNotBusy(SD_WRITE_TIMEOUT))
    {
        goto fail;
    }
    spiSend(STOP_TRAN_TOKEN);
    if (!waitNotBusy(SD_WRITE_TIMEOUT))
    {
        goto fail;
    }
    chipSelectHigh();
    return true;

fail:
    error(SD_CARD_ERROR_STOP_TRAN);
    chipSelectHigh();
    return false;
}

/**
 * Read a 512 byte block from an SD card device.
 *
 * \param[in] block Logical block to be read.
 * \param[out] dst Pointer to the location that will receive the data.

 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
int Sd2Card::readBlock(uint32_t block, uint8_t* dst) {
	//return readData(block, 0, 512, dst);
	unsigned int *idst;
	int i;


	if (!inBlock_ || block != block_) {
		block_ = block;
		// use address if not SDHC card
		if (type()!= SD_CARD_TYPE_SDHC) block <<= 9;
		if (cardCommand(CMD17, block)) {
			error(SD_CARD_ERROR_CMD17);
			goto fail;
		}
		if (!waitStartBlock()) {
			goto fail;
		}
		offset_ = 0;
		inBlock_ = 1;
	}
		/* Do fast readout */

	idst = (unsigned int*)dst;
	for (i=128;i!=0;i--) {
		*idst++=spiRec32(wishboneSlot_);
		// USPIDATA=0xff;
		// USPIDATA=0xff;
		// USPIDATA=0xff;
		// USPIDATA=0xff;
		//*idst++=USPIDATA;
	}
	chipSelectHigh();
	inBlock_ = 0;
	return true;

fail:
	chipSelectHigh();
	return false;
}

/**
 * Read a 512 byte block from an SD card.
 *
 * \param[in] blockNumber Logical block to be read.
 * \param[out] dst Pointer to the location that will receive the data.
 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
bool Sd2Card::readBlock(uint32_t blockNumber, uint8_t* dst) {
#if ENABLED(SD_CHECK_AND_RETRY)
  uint8_t retryCnt = 3;
  // use address if not SDHC card
  if (type()!= SD_CARD_TYPE_SDHC) blockNumber <<= 9;
 retry2:
  retryCnt --;
  if (cardCommand(CMD17, blockNumber)) {
    error(SD_CARD_ERROR_CMD17);
    if (retryCnt > 0) goto retry;
    goto fail;
  }
  if (!readData(dst, 512))
  {
    if (retryCnt > 0) goto retry;
    goto fail;
  }
  return true;
 retry:
   chipSelectHigh();
   cardCommand(CMD12, 0);//Try sending a stop command, but ignore the result.
   errorCode_ = 0;
   goto retry2;
#else
  // use address if not SDHC card
  if (type()!= SD_CARD_TYPE_SDHC) blockNumber <<= 9;
  if (cardCommand(CMD17, blockNumber)) {
    error(SD_CARD_ERROR_CMD17);
    goto fail;
  }
  return readData(dst, 512);
#endif

 fail:
  chipSelectHigh();
  return false;
}

//------------------------------------------------------------------------------
// send one block of data for write block or write multiple blocks
uint8_t Sd2Card::writeData(uint8_t token, const uint8_t* src) {
  spiSend(token);
  for (uint16_t i = 0; i < 512; i++) {
    spiSend(src[i]);
  }
  spiSend(0xff);  // dummy crc
  spiSend(0xff);  // dummy crc

  status_ = spiRec();
  if ((status_ & DATA_RES_MASK) != DATA_RES_ACCEPTED) {
    error(SD_CARD_ERROR_WRITE);
    chipSelectHigh();
    return false;
  }
  return true;
}

/**
 * Read part of a 512 byte block from an SD card.
 *
 * \param[in] block Logical block to be read.
 * \param[in] offset Number of bytes to skip at start of block
 * \param[out] dst Pointer to the location that will receive the data.
 * \param[in] count Number of bytes to read
 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
uint8_t Sd2Card::readData(uint32_t block,
        uint16_t offset, uint16_t count, uint8_t* dst) {
  uint16_t n;

  if (count == 0) return true;
  if ((count + offset) > 512) {
    goto fail;
  }
  if (!inBlock_ || block != block_ || offset < offset_) {
    block_ = block;
    // use address if not SDHC card
    if (type()!= SD_CARD_TYPE_SDHC) block <<= 9;
    if (cardCommand(CMD17, block)) {
      error(SD_CARD_ERROR_CMD17);
      goto fail;
    }
    if (!waitStartBlock()) {
      goto fail;
    }
    offset_ = 0;
    inBlock_ = 1;
  }

  // skip data before offset
  for (;offset_ < offset; offset_++) {
    spiRec();
  }

  n = count;

  // transfer data
  for (uint16_t i = 0; i < n; i++) {
    dst[i] = spiRec();
  }

  offset_ += count;
  if (!partialBlockRead_ || offset_ >= 512) {
    // read rest of data, checksum and set chip select high
    readEnd();
  }

  return true;

 fail:
  chipSelectHigh();
  return false;
}

//------------------------------------------------------------------------------
// send one block of data for write block or write multiple blocks
bool Sd2Card::writeData(uint8_t token, const uint8_t* src) {
  spiSendBlock(token, src);

  spiSend(0xff);  // dummy crc
  spiSend(0xff);  // dummy crc

  status_ = spiRec();
  if ((status_ & DATA_RES_MASK) != DATA_RES_ACCEPTED) {
    error(SD_CARD_ERROR_WRITE);
    goto fail;
  }
  return true;

 fail:
  chipSelectHigh();
  return false;
}

/** Skip remaining data in a block when in partial block read mode. */
void Sd2Card::readEnd(void) {
  if (inBlock_) {
      // skip data and crc
#ifdef OPTIMIZE_HARDWARE_SPI
    // optimize skip for hardware
    SPDR = 0XFF;
    while (offset_++ < 513) {
      while (!(SPSR & (1 << SPIF)));
      SPDR = 0XFF;
    }
    // wait for last crc byte
    while (!(SPSR & (1 << SPIF)));
#else  // OPTIMIZE_HARDWARE_SPI
    while (offset_++ < 514) spiRec();
#endif  // OPTIMIZE_HARDWARE_SPI
    chipSelectHigh();
    inBlock_ = 0;
  }
}

/** Wait for start block token */
int Sd2Card::waitStartBlock(void) {
	//unsigned t0 = millis();
	unsigned count = 30000;
	while ((status_ = spiRec()) == 0XFF) {
		if (count-- == 0) {
			error(SD_CARD_ERROR_READ_TIMEOUT);
			goto fail;
		}
	}

  if (status_ != DATA_START_BLOCK) {
    error(SD_CARD_ERROR_READ);
    goto fail;
  }
  return true;

 fail:
  chipSelectHigh();
  return false;
}

/** Skip remaining data in a block when in partial block read mode. */
void Sd2Card::readEnd(void) {
  if (inBlock_) {
      // skip data and crc
#ifdef SPI_DMA
        dma_setup_transfer(DMA1, DMA_CH3, &SPI1->regs->DR, DMA_SIZE_8BITS, ack, DMA_SIZE_8BITS,
                           (/*DMA_MINC_MODE | DMA_CIRC_MODE |*/ DMA_FROM_MEM | DMA_TRNS_CMPLT | DMA_TRNS_ERR));
        dma_attach_interrupt(DMA1, DMA_CH3, DMAEvent);
        dma_set_priority(DMA1, DMA_CH3, DMA_PRIORITY_VERY_HIGH);
        dma_set_num_transfers(DMA1, DMA_CH3, SPI_BUFF_SIZE + 1 - offset_);

        dmaActive = true;
        dma_enable(DMA1, DMA_CH3);

        while(dmaActive)delayMicroseconds(1);
        dma_disable(DMA1, DMA_CH3);
#else  // SPI_DMA
    while (offset_++ < 514) spiRec();
#endif  // SPI_DMA
    chipSelectHigh();
    inBlock_ = 0;
  }
}

/** Skip remaining data in a block when in partial block read mode. */
void Sd2Card::readEnd(void) {
  if (inBlock_) {
      // skip data and crc
#if defined(USE_TEENSY3_SPI)
    if (offset_ < 514) {
      spiRecIgnore(514 - offset_);
      offset_ = 514;
    }
#elif defined(OPTIMIZE_HARDWARE_SPI)
    // optimize skip for hardware
    SPDR = 0XFF;
    while (offset_++ < 513) {
      while (!(SPSR & (1 << SPIF)));
      SPDR = 0XFF;
    }
    // wait for last crc byte
    while (!(SPSR & (1 << SPIF)));
#else  // OPTIMIZE_HARDWARE_SPI
    while (offset_++ < 514) spiRec();
#endif  // OPTIMIZE_HARDWARE_SPI
    chipSelectHigh();
    inBlock_ = 0;
  }
}

/**
    Read part of a 512 byte block from an SD card.

    \param[in] block Logical block to be read.
    \param[in] offset Number of bytes to skip at start of block
    \param[out] dst Pointer to the location that will receive the data.
    \param[in] count Number of bytes to read
    \return The value one, true, is returned for success and
    the value zero, false, is returned for failure.
*/
uint8_t Sd2Card::readData(uint32_t block, uint16_t offset, uint16_t count, uint8_t* dst)
{
//    uint16_t n;
    if (count == 0)
    {
        return true;
    }
    if ((count + offset) > 512)
    {
        goto fail;
    }
    if (!inBlock_ || block != block_ || offset < offset_)
    {
        block_ = block;
        // use address if not SDHC card
        if (type() != SD_CARD_TYPE_SDHC)
        {
            block <<= 9;
        }
        if (cardCommand(CMD17, block))
        {
            error(SD_CARD_ERROR_CMD17);
            goto fail;
        }
        if (!waitStartBlock())
        {
            goto fail;
        }
        offset_ = 0;
        inBlock_ = 1;
    }

#ifdef OPTIMIZE_HARDWARE_SPI
    // start first spi transfer
    SPDR = 0XFF;

    // skip data before offset
    for (; offset_ < offset; offset_++)
    {
        while (!(SPSR & (1 << SPIF)));
        SPDR = 0XFF;
    }
    // transfer data
    n = count - 1;
    for (uint16_t i = 0; i < n; i++)
    {
        while (!(SPSR & (1 << SPIF)));
        dst[i] = SPDR;
        SPDR = 0XFF;
    }
    // wait for last byte
    while (!(SPSR & (1 << SPIF)));
    dst[n] = SPDR;

#else  // OPTIMIZE_HARDWARE_SPI

    // skip data before offset
    for (; offset_ < offset; offset_++)
    {
        spiRec();
    }
    // transfer data
    for (uint16_t i = 0; i < count; i++)
    {
        dst[i] = spiRec();
    }
#endif  // OPTIMIZE_HARDWARE_SPI

    offset_ += count;
    if (!partialBlockRead_ || offset_ >= 512)
    {
        // read rest of data, checksum and set chip select high
        readEnd();
    }
    return true;

fail:
    chipSelectHigh();
    return false;
}

/**
 * Read part of a 512 byte block from an SD card.
 *
 * \param[in] block Logical block to be read.
 * \param[in] offset Number of bytes to skip at start of block
 * \param[out] dst Pointer to the location that will receive the data.
 * \param[in] count Number of bytes to read
 * \return The value one, true, is returned for success and
 * the value zero, false, is returned for failure.
 */
uint8_t Sd2Card::readData(uint32_t block,
        uint16_t offset, uint16_t count, uint8_t* dst) {
  //uint16_t n;
  if (count == 0) return true;
  if ((count + offset) > 512) {
    goto fail;
  }
  if (!inBlock_ || block != block_ || offset < offset_) {
    block_ = block;
    // use address if not SDHC card
    if (type()!= SD_CARD_TYPE_SDHC) block <<= 9;
    if (cardCommand(CMD17, block)) {
      error(SD_CARD_ERROR_CMD17);
	  Serial.println("Error: CMD17");
      goto fail;
    }
    if (!waitStartBlock()) {
      goto fail;
    }
    offset_ = 0;
    inBlock_ = 1;
  }

#ifdef SPI_DMA
    // skip data before offset
    if(offset_ < offset){
        dma_setup_transfer(DMA1,
				DMA_CH3,
				&SPI1->regs->DR,
				DMA_SIZE_8BITS,
				ack,
				DMA_SIZE_8BITS,
                           (/*DMA_MINC_MODE | DMA_CIRC_MODE  |*/ DMA_FROM_MEM | DMA_TRNS_CMPLT | DMA_TRNS_ERR));
        dma_attach_interrupt(DMA1, DMA_CH3, DMAEvent);
        dma_set_priority(DMA1, DMA_CH3, DMA_PRIORITY_VERY_HIGH);
        dma_set_num_transfers(DMA1, DMA_CH3, offset - offset_);

        dmaActive = true;
        dma_enable(DMA1, DMA_CH3);

        while(dmaActive) delayMicroseconds(1);
        dma_disable(DMA1, DMA_CH3);
    }
    offset_ = offset;

    // transfer data
    dma_setup_transfer(DMA1, DMA_CH2, &SPI1->regs->DR, DMA_SIZE_8BITS, dst, DMA_SIZE_8BITS,
                       (DMA_MINC_MODE | DMA_TRNS_CMPLT | DMA_TRNS_ERR));
    dma_attach_interrupt(DMA1, DMA_CH2, DMAEvent);
    dma_setup_transfer(DMA1, DMA_CH3, &SPI1->regs->DR, DMA_SIZE_8BITS, ack, DMA_SIZE_8BITS,
                       (/*DMA_MINC_MODE | DMA_CIRC_MODE |*/ DMA_FROM_MEM));
    dma_set_priority(DMA1, DMA_CH2, DMA_PRIORITY_VERY_HIGH);
    dma_set_priority(DMA1, DMA_CH3, DMA_PRIORITY_VERY_HIGH);
    dma_set_num_transfers(DMA1, DMA_CH2, count);
    dma_set_num_transfers(DMA1, DMA_CH3, count);

    dmaActive = true;
    dma_enable(DMA1, DMA_CH3);
    dma_enable(DMA1, DMA_CH2);

    while(dmaActive) delayMicroseconds(1);
    dma_disable(DMA1, DMA_CH3);
    dma_disable(DMA1, DMA_CH2);

    offset_ += count;
    if (!partialBlockRead_ || offset_ >= SPI_BUFF_SIZE) {
        readEnd();
    }

#else
  // skip data before offset
  for (;offset_ < offset; offset_++) {
    spiRec();
  }
  // transfer data
  for (uint16_t i = 0; i < count; i++) {
    dst[i] = spiRec();
  }
  offset_ += count;
  if (!partialBlockRead_ || offset_ >= 512) {
    // read rest of data, checksum and set chip select high
    readEnd();
  }
#endif

  return true;

 fail:
  chipSelectHigh();
  Serial.println("Error: Sd2Card::readData()");
//.........这里部分代码省略.........

/**
    Initialize an SD flash memory card.

    \param[in] sckRateID SPI clock rate selector. See setSckRate().
    \param[in] chipSelectPin SD chip select pin number.

    \return The value one, true, is returned for success and
    the value zero, false, is returned for failure.  The reason for failure
    can be determined by calling errorCode() and errorData().
*/
uint8_t Sd2Card::init(uint8_t chipSelectPin, uint8_t sckRateID, int8_t SPI_Port, int8_t cardDetectionPin, int8_t level)
{
    // Serial.println("> Sd2Card::init");

    errorCode_ = inBlock_ = partialBlockRead_ = type_ = 0;
    chipSelectPin_ = chipSelectPin;
    SPI_Port_ = SPI_Port;
    cardDetectionPin_ = cardDetectionPin;
    level_ = level;

    // 16-bit init start time allows over a minute
    uint16_t t0 = (uint16_t)millis();
    uint32_t arg;

    // set pin modes
    pinMode(chipSelectPin_, OUTPUT);
    chipSelectHigh();

    if (cardDetectionPin_ >= 0)
    {
        pinMode(cardDetectionPin_, INPUT_PULLUP);
    }
    //#ifndef USE_SPI_LIB
    //  pinMode(SPI_MISO_PIN, INPUT);
    //  pinMode(SPI_MOSI_PIN, OUTPUT);
    //  pinMode(SPI_SCK_PIN, OUTPUT);
    //#endif

    //#ifndef SOFTWARE_SPI
    //#ifndef USE_SPI_LIB
    //  // SS must be in output mode even it is not chip select
    //  pinMode(SS_PIN, OUTPUT);
    //  digitalWrite(SS_PIN, HIGH); // disable any SPI device using hardware SS pin
    //  // Enable SPI, Master, clock rate f_osc/128
    //  SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR1) | (1 << SPR0);
    //  // clear double speed
    //  SPSR &= ~(1 << SPI2X);
    //#else // USE_SPI_LIB

    /// @todo Add SPI port selection for LM4F and TM4C

    SPI_for_SD.begin();

#if defined(__LM4F120H5QR__) || defined(__TM4C1230C3PM__) || defined(__TM4C123GH6PM__) || defined(__TM4C129XNCZAD__) || defined(__TM4C1294NCPDT__)
    // LM4F and TM4C specific
    if (SPI_Port >= 0)
    {
        SPI_for_SD.setModule(SPI_Port);
    }
#endif

#ifdef SPI_CLOCK_DIV128
    // Serial.println("> SPI_Port 128");
    SPI_for_SD.setClockDivider(SPI_CLOCK_DIV128);
#else
    // Serial.println("> SPI_Port 255");
    SPI_for_SD.setClockDivider(255);
#endif

    //#endif // USE_SPI_LIB
    //#endif // SOFTWARE_SPI


    // Hardware card detection
    if (cardDetectionPin_ >= 0)
    {
        //        debugln("hardware card detection %i should be %i", digitalRead(cardDetectionPin_), level);
        if (digitalRead(cardDetectionPin_) != level_)
        {
            // Serial.println("*** hardware failure");
            error(SD_CARD_ERROR_CMD0);
            // I don't like goto but this is how it is implemented
            goto fail;
        }
    }

    // Software card detection

    // must supply min of 74 clock cycles with CS high.
    for (uint8_t i = 0; i < 10; i++)
    {
        spiSend(0xff);
    }

    chipSelectLow();

    // Serial.print("software card detection ");


    // command to go idle in SPI mode
//.........这里部分代码省略.........