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122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
/* Arduino SdSpiAltDriver Library
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* Copyright (C) 2013 by William Greiman
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*
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* This file is part of the Arduino SdSpiAltDriver Library
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino SdSpiAltDriver Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#if defined(__STM32F1__)
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#include "SdSpiDriver.h"
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#define USE_STM32F1_DMAC 1
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//------------------------------------------------------------------------------
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static SPIClass m_SPI1(1);
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#if BOARD_NR_SPI > 1
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static SPIClass m_SPI2(2);
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#endif // BOARD_NR_SPI > 1
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#if BOARD_NR_SPI > 2
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static SPIClass m_SPI3(3);
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#endif // BOARD_NR_SPI > 2
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//
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static SPIClass* pSpi[] =
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#if BOARD_NR_SPI == 1
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{&m_SPI1};
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#elif BOARD_NR_SPI == 2
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{&m_SPI1, &m_SPI2};
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#elif BOARD_NR_SPI == 3
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{&m_SPI1, &m_SPI2, &m_SPI3};
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#else // BOARD_NR_SPI
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#error "BOARD_NR_SPI too large"
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#endif // BOARD_NR_SPI
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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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* \param[in] divisor SCK clock divider relative to the APB1 or APB2 clock.
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*/
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void SdSpiAltDriver::activate() {
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pSpi[m_spiPort]->beginTransaction(m_spiSettings);
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}
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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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pSpi[m_spiPort]->begin();
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}
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//------------------------------------------------------------------------------
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/**
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* End SPI transaction.
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*/
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void SdSpiAltDriver::deactivate() {
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pSpi[m_spiPort]->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 pSpi[m_spiPort]->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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int rtn = 0;
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#if USE_STM32F1_DMAC
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rtn = pSpi[m_spiPort]->dmaTransfer(0, const_cast<uint8*>(buf), n);
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#else // USE_STM32F1_DMAC
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// pSpi[m_spiPort]->read(buf, n); fails ?? use byte transfer
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for (size_t i = 0; i < n; i++) {
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buf[i] = pSpi[m_spiPort]->transfer(0XFF);
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}
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#endif // USE_STM32F1_DMAC
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return rtn;
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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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pSpi[m_spiPort]->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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#if USE_STM32F1_DMAC
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pSpi[m_spiPort]->dmaSend(const_cast<uint8*>(buf), n);
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#else // #if USE_STM32F1_DMAC
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pSpi[m_spiPort]->write(buf, n);
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#endif // USE_STM32F1_DMAC
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}
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//-----------------------------------------------------------------------------
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void SdSpiAltDriver::setPort(uint8_t portNumber) {
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m_spiPort = portNumber < 1 || portNumber > BOARD_NR_SPI ? 0 : portNumber -1;
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}
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#endif // defined(__STM32F1__)
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