My thanks goes to Junxiao Shi (yoursunny.com) for his original code and documentation - so full credit goes to him for 99.9% of this code. I added OLED display support and had to make one wiring modification with the slave select line (SS) on the SPI interface.

TcpFipsyLoader example

In this example, the ESP32 receives a JEDEC file via TCP, and flashes the Fipsy FPGA once the file has been verified.

Wiring

ESP32 pin	Fipsy pin
3V3	1
GND	2
14	3
12	4
13	5
22	6

Usage

1. Modify WiFi setting in this sketch, and upload to ESP32.
2. Look for the IP address in serial output.
3. In Lattice Diamond, compile a JEDEC file for MachXO2-256.
4. Execute nc esp32-ip-address 34779 < filename.jed.

Sample interaction:

$ nc 192.168.5.58 34779 < 1.jed
JEDEC OK, fuse checksum: A0A5
Feature Row: 0 0
FEABITS: 420
Programming ...
Success