ESP32 Forum

I recently made a board using the ESP-WROOM-02D module, and assumed I could just program this with JTAG via my JLINK EDU. I didn't route the USB pins at all, since I have absolutely no need for CDC or other USB functionality. I thought it was dumb to put a USB Micro connector if I'm not going to use it, so I put a tag-connect (little pogo pin cable) footprint for the JTAG signals and I hacked up a little protoboard to connect this to my JLINK.

Upon receiving and assembling my board, I'm finding that I have to burn the DIS_USB_JTAG fuse in order to use an external adapter. But in order to do this I'm pretty sure I need to connect to the USB serial interface. https://docs.espressif.com/projects/esp ... -jtag.html

Is it possible to burn the eFuse in my board's current configuration (no USB)?

Do you still have access to U0TXD and U0RXD? If so, you can also use those to program the chip and/or burn fuses.

Oh great! I didn't realize you could do that. I was able to use an external FTDI board to burn the fuse. Thanks