EZ32 ESP32JTAG is an open-source, wireless JTAG and logic analyzer tool that can debug both MCUs and FPGAs. It features a 16-channel 250 MHz logic analyzer and integrated UART interface, designed to replace tools such as ST-Link or Saleae analyzers in a single compact, wireless solution.
The device is built around an ESP32-S3 dual-core SoC and a small FPGA with 5k logic gates and 1 Mbit of internal RAM to handle high-speed signal processing. Connectivity options include Wi-Fi 4, Bluetooth 5.0, and USB Type-C, and a small 1.83-inch LCD displays system information such as IP address and status. The ESP32JTAG is also equipped with four configurable 4-wire ports for JTAG, SWD, UART, and logic analyzer mode, and supports target voltage monitoring.
EZ32 ESP32JTAG specifications:
- Wireless MCU – Espressif Systems ESP32-S3
- CPU – dual-core Tensilica LX7 @ up to 240 MHz with vector instructions for AI acceleration
- Memory – 512KB RAM, 8MB PSRAM
- Built-in wireless connectivity (See below)
- Storage – 16MB flash
- FPGA – Gowin Semiconductors GW1N FPGA (Not confirmed)
- Display – 1.83-inch LCD for IP address, Wi-Fi status, and system information
- Connectivity via ESP32-S3
- 2.4 GHz 802.11 b/g/n Wi-Fi 4 with 40 MHz bandwidth support
- Bluetooth Low Energy (BLE) 5.0 connectivity with the long-range backing, 2 Mbps data rate
- Onboard PCB antenna module
- USB – USB Type-C port for power and programming
- Supported Modes
- MCU JTAG/SWD debugging (OpenOCD, Blackmagic Probe, CMSIS-DAP)
- FPGA JTAG programming (openFPGALoader, XVC for Vivado)
- UART terminal with WebTerminal support
- 16-channel logic analyzer, up to 250 MHz sampling rate
- Misc
- Boot, Reset buttons
- Voltage monitoring and reset control
- Power – 5V via USB-C port
- Dimensions – 40 x 33 x 5 mm (bare board); 120 x 80 × 20 mm (package)
- Weight – 200 grams (with packaging)
- Compliance – CE, UKCA (underway), FCC (ESP32-S3 pre-certified module)
In terms of software support, the ESP32JTAG works with open-source tools such as OpenOCD, Blackmagic Probe, CMSIS-DAP, GDB Server, and openFPGALoader. It also supports IDEs like VSCode, Arduino IDE, STM32CubeIDE, Vivado, and PlatformIO. The built-in web interface provides configuration, firmware updates, and access to a browser-based logic analyzer and WebUART terminal without needing drivers. The firmware is based on ESP-IDF and FreeRTOS, and the company mentions that all hardware and files will be open-source and available on GitHub. EZ32 plans to release all open hardware files, firmware, and documentation before production is complete. The latest hardware revision (v1.4) focuses on Wi-Fi performance and enclosure.
Previously, we have written about other debugging tools like the WiSer, which allows users to establish a P2P wireless connection between a host computer and the USB-Cereal designed to simplify the testing, development, debugging, and manufacturing of devices with USB Type-C ports. While writing, one interesting thing I noticed is that the hardware configuration is very similar to the LILYGO T-FPGA devkit, with the same ESP32-S3 and GW1N FPGA configuration.
The ESP32JTAG is available for pre-order on Crowd Supply for $139 with free US shipping and $12 to the rest of the world. The campaign has already met its $10,000 funding goal and will remain open until December 4, 2025. Deliveries are expected to start on February 14, 2026. Units will be manufactured and tested by a professional PCB assembly house and fulfilled globally via Mouser’s logistics network.
Debashis Das is a technical content writer and embedded engineer with over five years of experience in the industry. With expertise in Embedded C, PCB Design, and SEO optimization, he effectively blends difficult technical topics with clear communication
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