/* Arduino SdSpiAltDriver Library * Copyright (C) 2013 by William Greiman * * 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(__STM32F1__) #include "SdSpiDriver.h" #define USE_STM32F1_DMAC 1 //------------------------------------------------------------------------------ static SPIClass m_SPI1(1); #if BOARD_NR_SPI > 1 static SPIClass m_SPI2(2); #endif // BOARD_NR_SPI > 1 #if BOARD_NR_SPI > 2 static SPIClass m_SPI3(3); #endif // BOARD_NR_SPI > 2 // static SPIClass* pSpi[] = #if BOARD_NR_SPI == 1 {&m_SPI1}; #elif BOARD_NR_SPI == 2 {&m_SPI1, &m_SPI2}; #elif BOARD_NR_SPI == 3 {&m_SPI1, &m_SPI2, &m_SPI3}; #else // BOARD_NR_SPI #error "BOARD_NR_SPI too large" #endif // BOARD_NR_SPI //------------------------------------------------------------------------------ /** Set SPI options for access to SD/SDHC cards. * * \param[in] divisor SCK clock divider relative to the APB1 or APB2 clock. */ void SdSpiAltDriver::activate() { pSpi[m_spiPort]->beginTransaction(m_spiSettings); } //------------------------------------------------------------------------------ /** 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); pSpi[m_spiPort]->begin(); } //------------------------------------------------------------------------------ /** * End SPI transaction. */ void SdSpiAltDriver::deactivate() { pSpi[m_spiPort]->endTransaction(); } //------------------------------------------------------------------------------ /** Receive a byte. * * \return The byte. */ uint8_t SdSpiAltDriver::receive() { return pSpi[m_spiPort]->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) { int rtn = 0; #if USE_STM32F1_DMAC rtn = pSpi[m_spiPort]->dmaTransfer(0, const_cast(buf), n); #else // USE_STM32F1_DMAC // pSpi[m_spiPort]->read(buf, n); fails ?? use byte transfer for (size_t i = 0; i < n; i++) { buf[i] = pSpi[m_spiPort]->transfer(0XFF); } #endif // USE_STM32F1_DMAC return rtn; } //------------------------------------------------------------------------------ /** Send a byte. * * \param[in] b Byte to send */ void SdSpiAltDriver::send(uint8_t b) { pSpi[m_spiPort]->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) { #if USE_STM32F1_DMAC pSpi[m_spiPort]->dmaSend(const_cast(buf), n); #else // #if USE_STM32F1_DMAC pSpi[m_spiPort]->write(buf, n); #endif // USE_STM32F1_DMAC } //----------------------------------------------------------------------------- void SdSpiAltDriver::setPort(uint8_t portNumber) { m_spiPort = portNumber < 1 || portNumber > BOARD_NR_SPI ? 0 : portNumber -1; } #endif // defined(__STM32F1__)