#if defined(ARDUINO_SAMD_ZERO) && defined(CRYSTALLESS) && defined(USBCON)
/* Arduino SdSpiCard Library
 * Copyright (C) 2012 by William Greiman
 *
 * This file is part of the Arduino SdSpiCard Library
 *
 * This Library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This Library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Arduino SdSpiCard Library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */
#include "SdSpiCard.h"
#include "SdSpi.h"
// debug trace macro
#define SD_TRACE(m, b)
// #define SD_TRACE(m, b) Serial.print(m);Serial.println(b);
//==============================================================================
#if USE_SD_CRC
// CRC functions
//------------------------------------------------------------------------------
static uint8_t CRC7(const uint8_t* data, uint8_t n) {
  uint8_t crc = 0;
  for (uint8_t i = 0; i < n; i++) {
    uint8_t d = data[i];
    for (uint8_t j = 0; j < 8; j++) {
      crc <<= 1;
      if ((d & 0x80) ^ (crc & 0x80)) {
        crc ^= 0x09;
      }
      d <<= 1;
    }
  }
  return (crc << 1) | 1;
}
//------------------------------------------------------------------------------
#if USE_SD_CRC == 1
// slower CRC-CCITT
// uses the x^16,x^12,x^5,x^1 polynomial.
static uint16_t CRC_CCITT(const uint8_t *data, size_t n) {
  uint16_t crc = 0;
  for (size_t i = 0; i < n; i++) {
    crc = (uint8_t)(crc >> 8) | (crc << 8);
    crc ^= data[i];
    crc ^= (uint8_t)(crc & 0xff) >> 4;
    crc ^= crc << 12;
    crc ^= (crc & 0xff) << 5;
  }
  return crc;
}
#elif USE_SD_CRC > 1  // CRC_CCITT
//------------------------------------------------------------------------------
// faster CRC-CCITT
// uses the x^16,x^12,x^5,x^1 polynomial.
#ifdef __AVR__
static const uint16_t crctab[] PROGMEM = {
#else  // __AVR__
static const uint16_t crctab[] = {
#endif  // __AVR__
  0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
  0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
  0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
  0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
  0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
  0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
  0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
  0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
  0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
  0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
  0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
  0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
  0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
  0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
  0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
  0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
  0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
  0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
  0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
  0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
  0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
  0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
  0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
  0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
  0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
  0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
  0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
  0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
  0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
  0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
  0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
  0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};
static uint16_t CRC_CCITT(const uint8_t* data, size_t n) {
  uint16_t crc = 0;
  for (size_t i = 0; i < n; i++) {
#ifdef __AVR__
    crc = pgm_read_word(&crctab[(crc >> 8 ^ data[i]) & 0XFF]) ^ (crc << 8);
#else  // __AVR__
    crc = crctab[(crc >> 8 ^ data[i]) & 0XFF] ^ (crc << 8);
#endif  // __AVR__
  }
  return crc;
}
#endif  // CRC_CCITT
#endif  // USE_SD_CRC
//==============================================================================
// SdSpiCard member functions
//------------------------------------------------------------------------------
bool SdSpiCard::begin(m_spi_t* spi, uint8_t chipSelectPin, uint8_t sckDivisor) {
  m_errorCode = m_type = 0;
  m_spi = spi;
  m_chipSelectPin = chipSelectPin;
  // 16-bit init start time allows over a minute
  uint16_t t0 = (uint16_t)millis();
  uint32_t arg;

  pinMode(m_chipSelectPin, OUTPUT);
  digitalWrite(m_chipSelectPin, HIGH);
  spiBegin();

  // set SCK rate for initialization commands
  m_sckDivisor = SPI_SCK_INIT_DIVISOR;
  spiBeginTransaction(m_sckDivisor);

  // must supply min of 74 clock cycles with CS high.
  for (uint8_t i = 0; i < 10; i++) {
    spiSend(0XFF);
  }
  spiEndTransaction();
  // command to go idle in SPI mode
  while (cardCommand(CMD0, 0) != R1_IDLE_STATE) {
    if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT) {
      error(SD_CARD_ERROR_CMD0);
      goto fail;
    }
  }
#if USE_SD_CRC
  if (cardCommand(CMD59, 1) != R1_IDLE_STATE) {
    error(SD_CARD_ERROR_CMD59);
    goto fail;
  }
#endif  // USE_SD_CRC
  // check SD version
  while (1) {
    if (cardCommand(CMD8, 0x1AA) == (R1_ILLEGAL_COMMAND | R1_IDLE_STATE)) {
      type(SD_CARD_TYPE_SD1);
      break;
    }
    for (uint8_t i = 0; i < 4; i++) {
      m_status = spiReceive();
    }
    if (m_status == 0XAA) {
      type(SD_CARD_TYPE_SD2);
      break;
    }
    if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT) {
      error(SD_CARD_ERROR_CMD8);
      goto fail;
    }
  }
  // initialize card and send host supports SDHC if SD2
  arg = type() == SD_CARD_TYPE_SD2 ? 0X40000000 : 0;

  while (cardAcmd(ACMD41, arg) != R1_READY_STATE) {
    // check for timeout
    if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT) {
      error(SD_CARD_ERROR_ACMD41);
      goto fail;
    }
  }
  // if SD2 read OCR register to check for SDHC card
  if (type() == SD_CARD_TYPE_SD2) {
    if (cardCommand(CMD58, 0)) {
      error(SD_CARD_ERROR_CMD58);
      goto fail;
    }
    if ((spiReceive() & 0XC0) == 0XC0) {
      type(SD_CARD_TYPE_SDHC);
    }
    // Discard rest of ocr - contains allowed voltage range.
    for (uint8_t i = 0; i < 3; i++) {
      spiReceive();
    }
  }
  chipSelectHigh();
  m_sckDivisor = sckDivisor;
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
// send command and return error code.  Return zero for OK
uint8_t SdSpiCard::cardCommand(uint8_t cmd, uint32_t arg) {
  // select card
  chipSelectLow();

  // wait if busy
  waitNotBusy(SD_WRITE_TIMEOUT);

  uint8_t *pa = reinterpret_cast<uint8_t *>(&arg);

#if USE_SD_CRC
  // form message
  uint8_t d[6] = {cmd | 0X40, pa[3], pa[2], pa[1], pa[0]};

  // add crc
  d[5] = CRC7(d, 5);

  // send message
  for (uint8_t k = 0; k < 6; k++) {
    spiSend(d[k]);
  }
#else  // USE_SD_CRC
  // send command
  spiSend(cmd | 0x40);

  // send argument
  for (int8_t i = 3; i >= 0; i--) {
    spiSend(pa[i]);
  }

  // send CRC - correct for CMD0 with arg zero or CMD8 with arg 0X1AA
  spiSend(cmd == CMD0 ? 0X95 : 0X87);
#endif  // USE_SD_CRC

  // skip stuff byte for stop read
  if (cmd == CMD12) {
    spiReceive();
  }

  // wait for response
  for (uint8_t i = 0; ((m_status = spiReceive()) & 0X80) && i != 0XFF; i++) {
  }
  return m_status;
}
//------------------------------------------------------------------------------
uint32_t SdSpiCard::cardSize() {
  csd_t csd;
  if (!readCSD(&csd)) {
    return 0;
  }
  if (csd.v1.csd_ver == 0) {
    uint8_t read_bl_len = csd.v1.read_bl_len;
    uint16_t c_size = (csd.v1.c_size_high << 10)
                      | (csd.v1.c_size_mid << 2) | csd.v1.c_size_low;
    uint8_t c_size_mult = (csd.v1.c_size_mult_high << 1)
                          | csd.v1.c_size_mult_low;
    return (uint32_t)(c_size + 1) << (c_size_mult + read_bl_len - 7);
  } else if (csd.v2.csd_ver == 1) {
    uint32_t c_size = 0X10000L * csd.v2.c_size_high + 0X100L
                      * (uint32_t)csd.v2.c_size_mid + csd.v2.c_size_low;
    return (c_size + 1) << 10;
  } else {
    error(SD_CARD_ERROR_BAD_CSD);
    return 0;
  }
}
//------------------------------------------------------------------------------
void SdSpiCard::spiYield() {
#if ENABLE_SPI_TRANSACTIONS && ENABLE_SPI_YIELD
  chipSelectHigh();
  chipSelectLow();
#endif  // ENABLE_SPI_TRANSACTIONS && ENABLE_SPI_YIELD
}
//------------------------------------------------------------------------------
void SdSpiCard::chipSelectHigh() {
  digitalWrite(m_chipSelectPin, HIGH);
  // insure MISO goes high impedance
  spiSend(0XFF);
  spiEndTransaction();
}
//------------------------------------------------------------------------------
void SdSpiCard::chipSelectLow() {
  spiBeginTransaction(m_sckDivisor);
  digitalWrite(m_chipSelectPin, LOW);
}
//------------------------------------------------------------------------------
bool SdSpiCard::erase(uint32_t firstBlock, uint32_t lastBlock) {
  csd_t csd;
  if (!readCSD(&csd)) {
    goto fail;
  }
  // check for single block erase
  if (!csd.v1.erase_blk_en) {
    // erase size mask
    uint8_t m = (csd.v1.sector_size_high << 1) | csd.v1.sector_size_low;
    if ((firstBlock & m) != 0 || ((lastBlock + 1) & m) != 0) {
      // error card can't erase specified area
      error(SD_CARD_ERROR_ERASE_SINGLE_BLOCK);
      goto fail;
    }
  }
  if (m_type != SD_CARD_TYPE_SDHC) {
    firstBlock <<= 9;
    lastBlock <<= 9;
  }
  if (cardCommand(CMD32, firstBlock)
      || cardCommand(CMD33, lastBlock)
      || cardCommand(CMD38, 0)) {
    error(SD_CARD_ERROR_ERASE);
    goto fail;
  }
  if (!waitNotBusy(SD_ERASE_TIMEOUT)) {
    error(SD_CARD_ERROR_ERASE_TIMEOUT);
    goto fail;
  }
  chipSelectHigh();
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::eraseSingleBlockEnable() {
  csd_t csd;
  return readCSD(&csd) ? csd.v1.erase_blk_en : false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::isBusy() {
  bool rtn;
  chipSelectLow();
  for (uint8_t i = 0; i < 8; i++) {
    rtn = spiReceive() != 0XFF;
    if (!rtn) {
      break;
    }
  }
  chipSelectHigh();
  return rtn;
}
//------------------------------------------------------------------------------
bool SdSpiCard::readBlock(uint32_t blockNumber, uint8_t* dst) {
  SD_TRACE("RB", blockNumber);
  // 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);

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::readBlocks(uint32_t block, uint8_t* dst, size_t count) {
  if (!readStart(block)) {
    return false;
  }
  for (uint16_t b = 0; b < count; b++, dst += 512) {
    if (!readData(dst)) {
      return false;
    }
  }
  return readStop();
}
//------------------------------------------------------------------------------
bool SdSpiCard::readData(uint8_t *dst) {
  chipSelectLow();
  return readData(dst, 512);
}
//------------------------------------------------------------------------------
bool SdSpiCard::readData(uint8_t* dst, size_t count) {
#if USE_SD_CRC
  uint16_t crc;
#endif  // USE_SD_CRC
  // wait for start block token
  uint16_t t0 = millis();
  while ((m_status = spiReceive()) == 0XFF) {
    if (((uint16_t)millis() - t0) > SD_READ_TIMEOUT) {
      error(SD_CARD_ERROR_READ_TIMEOUT);
      goto fail;
    }
  }
  if (m_status != DATA_START_BLOCK) {
    error(SD_CARD_ERROR_READ);
    goto fail;
  }
  // transfer data
  if ((m_status = spiReceive(dst, count))) {
    error(SD_CARD_ERROR_SPI_DMA);
    goto fail;
  }

#if USE_SD_CRC
  // get crc
  crc = (spiReceive() << 8) | spiReceive();
  if (crc != CRC_CCITT(dst, count)) {
    error(SD_CARD_ERROR_READ_CRC);
    goto fail;
  }
#else
  // discard crc
  spiReceive();
  spiReceive();
#endif  // USE_SD_CRC
  chipSelectHigh();
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::readOCR(uint32_t* ocr) {
  uint8_t *p = reinterpret_cast<uint8_t*>(ocr);
  if (cardCommand(CMD58, 0)) {
    error(SD_CARD_ERROR_CMD58);
    goto fail;
  }
  for (uint8_t i = 0; i < 4; i++) {
    p[3 - i] = spiReceive();
  }

  chipSelectHigh();
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
/** read CID or CSR register */
bool SdSpiCard::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;
  }
  return readData(dst, 16);

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::readStart(uint32_t blockNumber) {
  SD_TRACE("RS", blockNumber);
  if (type() != SD_CARD_TYPE_SDHC) {
    blockNumber <<= 9;
  }
  if (cardCommand(CMD18, blockNumber)) {
    error(SD_CARD_ERROR_CMD18);
    goto fail;
  }
  chipSelectHigh();
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::readStop() {
  if (cardCommand(CMD12, 0)) {
    error(SD_CARD_ERROR_CMD12);
    goto fail;
  }
  chipSelectHigh();
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
// wait for card to go not busy
bool SdSpiCard::waitNotBusy(uint16_t timeoutMillis) {
  uint16_t t0 = millis();
  while (spiReceive() != 0XFF) {
    if (((uint16_t)millis() - t0) >= timeoutMillis) {
      goto fail;
    }
    spiYield();
  }
  return true;

fail:
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::writeBlock(uint32_t blockNumber, const uint8_t* src) {
  SD_TRACE("WB", blockNumber);
  // use address if not SDHC card
  if (type() != SD_CARD_TYPE_SDHC) {
    blockNumber <<= 9;
  }
  if (cardCommand(CMD24, blockNumber)) {
    error(SD_CARD_ERROR_CMD24);
    goto fail;
  }
  if (!writeData(DATA_START_BLOCK, src)) {
    goto fail;
  }

#define CHECK_PROGRAMMING 0
#if CHECK_PROGRAMMING
  // wait for flash programming to complete
  if (!waitNotBusy(SD_WRITE_TIMEOUT)) {
    error(SD_CARD_ERROR_WRITE_TIMEOUT);
    goto fail;
  }
  // response is r2 so get and check two bytes for nonzero
  if (cardCommand(CMD13, 0) || spiReceive()) {
    error(SD_CARD_ERROR_WRITE_PROGRAMMING);
    goto fail;
  }
#endif  // CHECK_PROGRAMMING

  chipSelectHigh();
  return true;

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::writeBlocks(uint32_t block, const uint8_t* src, size_t count) {
  if (!writeStart(block, count)) {
    return false;
  }
  for (size_t b = 0; b < count; b++, src += 512) {
    if (!writeData(src)) {
      return false;
    }
  }
  return writeStop();
}
//------------------------------------------------------------------------------
bool SdSpiCard::writeData(const uint8_t* src) {
  chipSelectLow();
  // wait for previous write to finish
  if (!waitNotBusy(SD_WRITE_TIMEOUT)) {
    goto fail;
  }
  if (!writeData(WRITE_MULTIPLE_TOKEN, src)) {
    goto fail;
  }
  chipSelectHigh();
  return true;

fail:
  error(SD_CARD_ERROR_WRITE_MULTIPLE);
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
// send one block of data for write block or write multiple blocks
bool SdSpiCard::writeData(uint8_t token, const uint8_t* src) {
#if USE_SD_CRC
  uint16_t crc = CRC_CCITT(src, 512);
#else  // USE_SD_CRC
  uint16_t crc = 0XFFFF;
#endif  // USE_SD_CRC
  spiSend(token);
  spiSend(src, 512);
  spiSend(crc >> 8);
  spiSend(crc & 0XFF);

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

fail:
  chipSelectHigh();
  return false;
}
//------------------------------------------------------------------------------
bool SdSpiCard::writeStart(uint32_t blockNumber, uint32_t eraseCount) {
  SD_TRACE("WS", blockNumber);
  // 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 SdSpiCard::writeStop() {
  chipSelectLow();
  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;
}
#endif
