Hi, I want to make the printer wirelessly using esp8266, but when connected via UART download speed of gcode files is very low (up to 2 Mbit / s). Is it possible to configure the SPI for receiving commands? Speed up 12,5Mbit / s. I understand that I can not connect a display and a thermocouple.
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Using SPI as a serial console isn’t supported, and would require additional code. It shouldn’t be *too much* difficult. If you want to have a crack at it tell me and I’ll help you as best as I can.
Are you streaming ( executing lines of Gcode over serial ) or uploading ( writing a file to the SD card ) ? If you are uploading, the limit is in the speed at which the SD card is accessed, and using SPI will not help.
I’m uploading a file. Is it possible to estimate the maximum speed of access to the SD card? I do not know how 
It’s not very high. Uploading via USB or Ethernet will give you a good idea of the max capacity