Well, when you look at the schematics of the dual port logging shield https://cdn.sparkfun.com/assets/8/0/5/e ... ic_v11.pdf
, (look at the thing plus footprint), it is clear that the CS pin is connected to A5 (GPIO04) (or optionally to A4 - GPIO36 and A3 - GPIO39). Based on the graphical data sheet the * on GPIO036 and GPIO039 denotes that it can't be used as port output, but A5-GPIO04 has no restrictions.
The SD card logger that is on the ESP WROOM (USB-C) is connected to GPIO05 and it works, but I really want the features of the dual port logging shield...
I don't have another MCU. Do you have a suggestion of a model that might work with this datalogger?