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SdSpiTeensy3.cpp - Use transfer(tx, rx, size) - avoid 512 bytes on stack #14

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merged 1 commit into from
Jan 16, 2025
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SdSpiTeensy3.cpp - Use transfer(tx, rx, size) - avoid 512 bytes on stack #14

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23 changes: 11 additions & 12 deletions src/SpiDriver/SdSpiTeensy3.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@
*/
#include "SdSpiDriver.h"
#if defined(SD_USE_CUSTOM_SPI) && defined(__arm__) && defined(CORE_TEENSY)
#define USE_BLOCK_TRANSFER 1
#define USE_TRANSFER_TX_RX 1
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::activate() {
m_spi->beginTransaction(m_spiSettings);
Expand Down Expand Up @@ -59,14 +59,13 @@ uint8_t SdSpiArduinoDriver::receive() {
}
//------------------------------------------------------------------------------
uint8_t SdSpiArduinoDriver::receive(uint8_t* buf, size_t count) {
#if USE_BLOCK_TRANSFER
#ifdef USE_TRANSFER_TX_RX
m_spi->setTransferWriteFill(0xff);
m_spi->transfer(nullptr, buf, count);
#else
memset(buf, 0XFF, count);
m_spi->transfer(buf, count);
#else // USE_BLOCK_TRANSFER
for (size_t i = 0; i < count; i++) {
buf[i] = m_spi->transfer(0XFF);
}
#endif // USE_BLOCK_TRANSFER
#endif
return 0;
}
//------------------------------------------------------------------------------
Expand All @@ -75,16 +74,16 @@ void SdSpiArduinoDriver::send(uint8_t data) {
}
//------------------------------------------------------------------------------
void SdSpiArduinoDriver::send(const uint8_t* buf , size_t count) {
#if USE_BLOCK_TRANSFER
#ifdef USE_TRANSFER_TX_RX
m_spi->transfer(buf, nullptr, count);
#else
uint32_t tmp[128];
if (0 < count && count <= 512) {
memcpy(tmp, buf, count);
m_spi->transfer(tmp, count);
return;
}
#endif // USE_BLOCK_TRANSFER
for (size_t i = 0; i < count; i++) {
m_spi->transfer(buf[i]);
}

#endif
}
#endif // defined(SD_USE_CUSTOM_SPI) && defined(__arm__) &&defined(CORE_TEENSY)