105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
/**
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* Copyright (c) 2011-2018 Bill Greiman
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* This file is part of the SdFat library for SD memory cards.
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*
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* MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#if defined(ESP8266)
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#include "SdSpiDriver.h"
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//------------------------------------------------------------------------------
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/** Initialize the SPI bus.
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*
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* \param[in] chipSelectPin SD card chip select pin.
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*/
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void SdSpiAltDriver::begin(uint8_t csPin) {
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m_csPin = csPin;
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pinMode(m_csPin, OUTPUT);
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digitalWrite(m_csPin, HIGH);
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SPI.begin();
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}
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//------------------------------------------------------------------------------
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/** Set SPI options for access to SD/SDHC cards.
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*
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*/
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void SdSpiAltDriver::activate() {
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SPI.beginTransaction(m_spiSettings);
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}
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//------------------------------------------------------------------------------
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void SdSpiAltDriver::deactivate() {
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// Note: endTransaction is an empty function on ESP8266.
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SPI.endTransaction();
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}
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//------------------------------------------------------------------------------
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/** Receive a byte.
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*
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* \return The byte.
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*/
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uint8_t SdSpiAltDriver::receive() {
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return SPI.transfer(0XFF);
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}
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//------------------------------------------------------------------------------
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/** Receive multiple bytes.
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*
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* \param[out] buf Buffer to receive the data.
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* \param[in] n Number of bytes to receive.
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*
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* \return Zero for no error or nonzero error code.
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*/
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uint8_t SdSpiAltDriver::receive(uint8_t* buf, size_t n) {
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// Adjust to 32-bit alignment.
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while ((reinterpret_cast<uintptr_t>(buf) & 0X3) && n) {
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*buf++ = SPI.transfer(0xff);
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n--;
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}
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// Do multiple of four byte transfers.
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size_t n4 = 4*(n/4);
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SPI.transferBytes(0, buf, n4);
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// Transfer up to three remaining bytes.
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for (buf += n4, n -= n4; n; n--) {
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*buf++ = SPI.transfer(0xff);
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}
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return 0;
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}
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//------------------------------------------------------------------------------
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/** Send a byte.
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*
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* \param[in] b Byte to send
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*/
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void SdSpiAltDriver::send(uint8_t b) {
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SPI.transfer(b);
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}
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//------------------------------------------------------------------------------
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/** Send multiple bytes.
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*
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* \param[in] buf Buffer for data to be sent.
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* \param[in] n Number of bytes to send.
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*/
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void SdSpiAltDriver::send(const uint8_t* buf , size_t n) {
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// Adjust to 32-bit alignment.
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while ((reinterpret_cast<uintptr_t>(buf) & 0X3) && n) {
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SPI.transfer(*buf++);
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n--;
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}
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SPI.transferBytes(const_cast<uint8_t*>(buf), 0, n);
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}
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#endif // defined(ESP8266)
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