/* Arduino SdSpiAltDriver Library * Copyright (C) 2016 by William Greiman * * STM32F1 code for Maple and Maple Mini support, 2015 by Victor Perez * * This file is part of the Arduino SdSpiAltDriver 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 SdSpiAltDriver Library. If not, see * . */ #if defined(ESP8266) #include "SdSpiDriver.h" //------------------------------------------------------------------------------ /** Initialize the SPI bus. * * \param[in] chipSelectPin SD card chip select pin. */ void SdSpiAltDriver::begin(uint8_t csPin) { m_csPin = csPin; pinMode(m_csPin, OUTPUT); digitalWrite(m_csPin, HIGH); SPI.begin(); } //------------------------------------------------------------------------------ /** Set SPI options for access to SD/SDHC cards. * */ void SdSpiAltDriver::activate() { SPI.beginTransaction(m_spiSettings); } //------------------------------------------------------------------------------ void SdSpiAltDriver::deactivate() { // Note: endTransaction is an empty function on ESP8266. SPI.endTransaction(); } //------------------------------------------------------------------------------ /** Receive a byte. * * \return The byte. */ uint8_t SdSpiAltDriver::receive() { return SPI.transfer(0XFF); } //------------------------------------------------------------------------------ /** Receive multiple bytes. * * \param[out] buf Buffer to receive the data. * \param[in] n Number of bytes to receive. * * \return Zero for no error or nonzero error code. */ uint8_t SdSpiAltDriver::receive(uint8_t* buf, size_t n) { // Works without 32-bit alignment of buf. SPI.transferBytes(0, buf, n); return 0; } //------------------------------------------------------------------------------ /** Send a byte. * * \param[in] b Byte to send */ void SdSpiAltDriver::send(uint8_t b) { SPI.transfer(b); } //------------------------------------------------------------------------------ /** Send multiple bytes. * * \param[in] buf Buffer for data to be sent. * \param[in] n Number of bytes to send. */ void SdSpiAltDriver::send(const uint8_t* buf , size_t n) { // Adjust to 32-bit alignment. while ((reinterpret_cast(buf) & 0X3) && n) { SPI.transfer(*buf++); n--; } SPI.transferBytes(const_cast(buf), 0, n); } #endif // defined(ESP8266)