teensy-sdfat/src/SpiDriver/SdSpiArtemis.cpp

/**
 * Copyright (c) 2011-2019 Bill Greiman
 * This file is part of the SdFat 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.
 */
#include "SdSpiDriver.h"
#if defined(SD_USE_CUSTOM_SPI) && defined(ARDUINO_ARCH_APOLLO3)
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::activate() {
  m_spi->beginTransaction(m_spiSettings);
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::begin(SdSpiConfig spiConfig) {
  if (spiConfig.spiPort) {
    m_spi = spiConfig.spiPort;
  } else {
    m_spi = &SPI;
  }
  m_spi->begin();
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::deactivate() {
  m_spi->endTransaction();
}
//------------------------------------------------------------------------------
uint8_t SdSpiArduinoDriver::receive() {
  return m_spi->transfer(0XFF);
}
//------------------------------------------------------------------------------
uint8_t SdSpiArduinoDriver::receive(uint8_t *buf, size_t count) {
  m_spi->transferIn(buf, count);
  return 0;
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::send(uint8_t data) {
  m_spi->transfer(data);
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::send(const uint8_t *buf, size_t count) {
  // If not a multiple of four.  Command with CRC used six byte send.
  while (count%4) {
    send(*buf++);
    count--;
  }
  // Convert byte array to 4 byte array.
  uint32_t myArray[count/4]; // NOLINT
  for (int x = 0; x < count/4; x++) {
    myArray[x] = ((uint32_t)buf[(x * 4) + 3] << (8 * 3)) |
                 ((uint32_t)buf[(x * 4) + 2] << (8 * 2)) |
                 ((uint32_t)buf[(x * 4) + 1] << (8 * 1)) |
                 ((uint32_t)buf[(x * 4) + 0] << (8 * 0));
  }
  m_spi->transfer(reinterpret_cast<void *>(myArray), count);
}
#endif  // defined(SD_USE_CUSTOM_SPI) && defined(ARDUINO_ARCH_APOLLO3)