A-Star 32u4 Micro - SD Card

I’m trying to connect a micro SD reader to the A-Star 32u4 Micro using the SdFat library, with no luck.

The error message I keep getting:
Can’t access SD card. Do not reformat.
SD errorCode: 0X30,0X3

I’ve tried hooking up the MOSI/MISO/SCK pins to the corresponding pins on the a-star’s ISP header, and using pin 9 as the chip select pin. I’m using the 3.3v power from an arduino nano to power the SD reader, since the 3.3v pin from the a-star can only provide 50mA, which might not be enough to run the SD reader. I tried running the SdInfo example, but always get the error message. I tried switching pins and using SoftwareSPI instead, with the same results.

It’s also worth noting I can plug the same SD reader into an arduino nano and both SdFat examples work.

Has anyone tried to use an SD reader with the A-Star micro with any success that can point me in the right direction?



What micro SD card reader are you using? Do you have a datasheet or any other information about it? Can you post pictures that show how everything is connected?