Try SdFat, a Library for SD Cards

[whg]

I did log the issue but never followed up to check for a fix since I became very busy with other non Particle projects.

Bug in SPI block transfer complete callback

The SPI DMA block transfer call back for transfer complete is based on DMA TX complete. The SPI interface may still be busy which may cause following single byte transfers to fail. Here is part of a routine that writes a block to an SD card. spiSend(src, 512); // send data spiSend(crc >> 8); // send dummy crc byte spiSend(crc & 0XFF); // send dummy crc byte m_status = spiReceive(); // get status token chipSelectHigh(); // set chip select high and send byte to make MISO high-Z This tra…