Programming WT32-ETH01 with a nodemcu (esp8266). And working EXAMPLE core ESP32 >3.0 (!)

[arjenv]

I am not sure whether this github is still active, but searching the net for examples for my -just arrived- WT32 ETH0 board, the info is scarce.

It appears that most of the examples and libraries are outdated. They are for ESP32 core 2.+ and not for 3.+ I found out the hard way :-(

No example would compile without errors, tried several boards in the IDE. Nothing.

Then finally I stumbled upon the fine library of Juraj: (https://github.com/Networking-for-Arduino/EthernetESP32)

It is in the 'manage library' tab of the Arduino IDE. just search for Ethernetesp32

I used the example helloserver.ini.

Change the driver from
W5500Driver driver;
to

EMACDriver driver(ETH_PHY_LAN8720, 23,18,16);

(I just commented out the 1st driver)

I do not have a programmer, but I do have several Nodemcu's lying around. I will use that as a programmer. Don't have fancy graphic software to make a picture but this is what I did:

On the NODEMCU connect Enable pin with GND (effectively bypassing the ESP8266, it is now just an USB-RS232 interface)

Connect TXpin (NodeMCU) to TXpin (ESP32)
Connect RXpin (NodeMCU) to RXpin (ESP32)
Connect +3V3 (NodeMCU) to +3V3 (ESP32)
Connect GND (NodeMCU) to GND (ESP32)

Finally on the WT32 connect Io0 to GND

As you may notice the RX/TX lines are not crossed.

Compile and upload the Sketch.
Disconnect the Io0 from GND
restart the ESP32 (I have to disconnect/reconnect the 3V3 pin, did not find a reset button on the WT32)
Don't forget to connect the WT32 to your network with a UTP cable.

This example gets a DHCP address from you router. It will print this to the serial port. Then I type this IP address in my browser it just returns:
hello from esp32!

So we are in business!

Hope others can benefit from this.