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SdSpiESP.cpp
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96 lines (94 loc) · 3.59 KB
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/**
* Copyright (c) 2011-2022 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(ESP8266) || defined(ESP32))
#define ESP_UNALIGN_OK 1
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::activate() {
m_spi->beginTransaction(m_spiSettings);
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::begin(SdSpiConfig spiConfig) {
if (spiConfig.spiPort) {
m_spi = spiConfig.spiPort;
#if defined(SDCARD_SPI) && defined(SDCARD_SS_PIN)
} else if (spiConfig.csPin == SDCARD_SS_PIN) {
m_spi = &SDCARD_SPI;
#endif // defined(SDCARD_SPI) && defined(SDCARD_SS_PIN)
} else {
m_spi = &SPI;
}
m_spi->begin();
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::deactivate() {
m_spi->endTransaction();
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::end() {
m_spi->end();
}
//------------------------------------------------------------------------------
uint8_t SdSpiArduinoDriver::receive() {
return m_spi->transfer(0XFF);
}
//------------------------------------------------------------------------------
uint8_t SdSpiArduinoDriver::receive(uint8_t* buf, size_t count) {
#if ESP_UNALIGN_OK
m_spi->transferBytes(nullptr, buf, count);
#else // ESP_UNALIGN_OK
// Adjust to 32-bit alignment.
while ((reinterpret_cast<uintptr_t>(buf) & 0X3) && count) {
*buf++ = m_spi->transfer(0xff);
count--;
}
// Do multiple of four byte transfers.
size_t n4 = 4*(count/4);
if (n4) {
m_spi->transferBytes(nullptr, buf, n4);
}
// Transfer up to three remaining bytes.
for (buf += n4, count -= n4; count; count--) {
*buf++ = m_spi->transfer(0xff);
}
#endif // ESP_UNALIGN_OK
return 0;
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::send(uint8_t data) {
m_spi->transfer(data);
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::send(const uint8_t* buf , size_t count) {
#if !ESP_UNALIGN_OK
// Adjust to 32-bit alignment.
while ((reinterpret_cast<uintptr_t>(buf) & 0X3) && count) {
SPI.transfer(*buf++);
count--;
}
#endif // #if ESP_UNALIGN_OK
m_spi->transferBytes(const_cast<uint8_t*>(buf), nullptr, count);
}
#endif // defined(SD_USE_CUSTOM_SPI) && (defined(ESP8266) || defined(ESP32))