The ESP USB Bridge is an ESP-IDF project utilizing an ESP32-S2 (or optionally, an ESP32-S3) chip to create a bridge between a computer and a target microcontroller. It can serve as a replacement for USB-to-UART chips (e.g. CP210x).
ESP USB Bridge creates a composite USB device accessible from the computer when they are connected through a USB cable. The main features are the following.
- Serial bridge: The developer can run esptool or connect a terminal program to the serial port provided by the USB CDC. The communication is transferred in both directions between the computer and the target microcontroller through the ESP USB bridge.
- JTAG bridge: openocd-esp32 can be run on the computer which will connect to the ESP USB Bridge. The ESP32-S2 acts again as a bridge between the computer and the target microcontroller, and transfers JTAG communication between them in both directions.
- Mass storage device: USB Mass storage device is created which can be accessed by a file explorer of the computer. Binaries in UF2 format can be copied to this disk and the ESP32-S2 will use them to flash the target microcontroller. Currently ESP USB Bridge is capable of flashing various Espressif microcontrollers.
More information about the project can be found on Github. We hope it will be useful for the community. It is licensed under the Apache License Version 2.0. We welcome issue reports, feature requests and contributions on the project’s Github page.