I’ve been able to upload the firmware to the custom board, there was a problem with a diode. When I open serial monitor to see messages, I see there is a problem with ESP32 and LAN8742:
Do you know why this happens? Maybe a hardware issue?

I'm using both ESP32 and USB-to-serial converter because if I only use converter I can't make it work as a programmer and terminal. As putty is using the converter port, if I try to flash the program CPU can't access converter port because it is already opened: serial.serialutil.SerialException: cou...

You're right, crystal signal seems to be noise. That's the cleanest signal I could obtain, but that's not a 40 Mhz frequency signal: IMG_20220922_081327.jpg To use the standard terminal, I've implemented this setup: setup.jpg I use USB to UART converter (left) to flash the custom board. To see the m...

Hi,

Thanks for reply. The 3.3V line is stable as shown here: 40 MHz crystal seems to be oscillating too: Related to your last question, I'm not able to use a standard terminal on my serial-to-USB converter unfortunately.

Hi, I'm woking on a project with a custom board based on ESP32, I attach the schematics project. When I try to load the program into the board, I get the following error: A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header. I'm using an USB to UART converter, conn...