Has anyone had success hooking up an SD card to the Photon and writing/reading data?

Firmware Libraries
41

If you hit the SHOW RAW button in Web IDE when you see the error, you’ll find out that it is related to this line

  if (!sd.begin(chipSelect, SPI_HALF_SPEED))

You should be able to use SPI_FULL_SPEED instead, but if that produces communication errors you can use SD_SCK_HZ(4 * MHZ) instead of SPI_HALF_SPEED.

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