As per the title, the SD card inserted into the expansion board is not recognized.
I also suspected the contact between the main board and the expansion board, which is another questioner's solution, but I can't recognize it.
Also, on the main board side, /dev/cu.SLAB_USBtoUART appears on the serial port, but not on the expansion board side (connected to the main board).Is there any other cause besides poor contact?
Does this mean that the SD card cannot be recognized as storage from the PC?
In that case, you must write a sketch to SPRESENSE to move it as mass storage before it will be recognized.
There is a sketch called "UsbMsc.ino" in the example sketch, so open it, compile it, and burn it to SPRESENSE.
If you see the following message on the serial console after the program runs, you are aware of the SD card.
\*\**USB MSC Prepared!***
Insert SD and Connect Extension Board USB to PC.
If the SD card is not recognized, the following message will appear and fail:
SD card is not present
USB MSC Failure!
After that, you can see the cable into the USB port on the side of the expansion board and the SD card as storage from your PC.
Try it.
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