Well, I celebrated too soon. Still has the same behavior. I am adding a 10µf cap to the EN pin and GND.

DE

Group,

I added a 100µf cap to the 5v power plane, next to the 5v pin of the ESP32. The system now boots. I believe this will solve the issue.

Adding a cap next to the EN pin, just in case. Laying out the new PCB at this moment.

Many thanks, David

Great suggestions. So I put my logic analyzer on 5v and 3.3v. These is a dip in the 5v when the ESP32 initializes. And no, I do not have enough capacitance on the 5v rail. My bad, but easily resolved. Since I am building a REV2 of this board, I just may add a 2nd 5v regulator just for the ESP32. Tha...

Group, I have a ESP32-DevKitC-32UE mounted to a custom PCB as the controller module. The core is powered by +5V regulated to the 5V pin and GND. The PCB runs at 5V logic and I have a TXB0104 and TXS0104 chips for 5v/3.3v interface. The system also uses SPI and I2C. Both of these are buffered via the...

I have a complete controller that the ESP32 mounts to, with a JTAG interface. Install a ESP32 U device (ESP32-DevKitC-32U); program and debug in Visual Studio/Visual Micro. Works perfectly. Install a ESP32 UE device (ESP32-DevKitC-32UE); program and debug in Visual Studio/Visual Micro. Fails with th...

I am now using a ESP32-DevKitC-32EU, as the E device is not longer available. Same error as the E device. I would like to resolve this, as I have a new project to start soon. -- The 32U device works just fine. I have two ESP-PROG; same results for both. Error: Open On-Chip Debugger v0.10.0-esp32-201...

This is a brand new module from Mouser Electronics. I will try again with a different module. I will program via Arduino with a running example program, which will set all the pin designations and attempt the JTAG interface.

Thanks, David

I have a development system running with a ESP32-DevKitC-32U core. It has a JTAG interface on the PCB connected to the ESP32-PROG programmer. It has worked flawlessly for 6 months (Visual Studio; running Visual Micro Arduino extension). I recently purchased an ESP32-DevKitC-32E core. It fails to con...