kholia/xvc-esp8266
ESP8266 powered Xilinx Virtual Cable - Xilinx WiFi JTAG!
Xilinx Virtual Cable Server for ESP8266
Overview
ESP8266 implementation of XVC (Xilinx Virtual Cable) protocol based on xvcd
(https://github.com/tmbinc/xvcd).
By connecting the ESP8266 to the JTAG pins (TDI, TDO, TMS, TCK) of the target
FPGA, you can access the JTAG port of the FPGA from a Xilinx tool (Vivado,
etc.) via WiFi.
Author: Gennaro Tortone (https://github.com/gtortone)
Author 2: Dhiru Kholia - Remove optimizations (in hope of gaining wider
compatibility), Mirror functions from xvcpi (to make debugging easier).
Note: This project was tested with Vivado 2021.1, WeMos D1 Mini as the JTAG
programmer (XVC daemon), and EBAZ4205 'Development' FPGA Board in August 2021.
How to use
Change the WiFi credentials in the credentials.h file.
Note: The default pin mappings for the common, low-cost WeMos D1 Mini ESP8266
development board are:
| ESP8266 | JTAG |
|---|---|
| D6 | TDI |
| D4 | TDO |
| D7 | TCK |
| D5 | TMS |
Feel free to experiment with different ESP8266 development boards - most should
just work with any problems.
Next, build the program using Arduino IDE and write it to the ESP8266 board.
Finally, select the Add Xilinx Virtual Cable (XVC) option in the Hardware Manager in Vivado and mention the IP address of the ESP8266 board.
How to use (Linux version)
make install_arduino_cli
make install_platform
make deps
make upload
Tips
If you see the End of startup status: LOW error message in Vivado, check the
FPGA power supply's voltage and current ratings.
Rough Performance Stats ("Speed")
If cost and ease-of-availability are the driving constraints (at the cost of
speed), then this project is 'usable' and can probably suffice. If higher
programming speed is a requirement, I recommend using xc3sprog or
openFPGALoader with an FT2232H board.
This project might be the cheapest Vivado-Compatible JTAG programmer.
https://github.com/gtortone/esp-xvcd is much faster but there have been reports
of FPGA programming failures with it.
https://github.com/pftbest/xvc-esp8266 - this has GPIO optimizations + a nice
program structure - thanks!
Also see the following Related Projects section.
Related Ideas / Projects
- https://github.com/kholia/xvc-pico
- https://github.com/kholia/xvcpi
- https://github.com/kholia/xvc-esp32
- https://github.com/kholia/Colorlight-5A-75B
- https://github.com/fusesoc/blinky#ebaz4205-development-board
License
Probably -> CC0 1.0 Universal (CC0 1.0) - Public Domain Dedication