FPGA passthru app allowing programming of the ESP32.
As shown in the schematics (page 7), the ESP32 pins are not directly accessible, and need an FPGA signal PassThru to be loaded.
VHDL PassThru in Lattice Diamond for Windows
Verilog PassThru in Lattice Diamond for Windows
See bin/upload_passthru.sh or bin/upload_passthru.bat
For additional passthru info, see https://github.com/emard/ulx3s-passthru