ESP32 + LAN8720 potential problems?

Arrovil
Posts: 2
Joined: Fri Oct 16, 2020 11:51 am

ESP32 + LAN8720 potential problems?

Postby Arrovil » Tue Oct 20, 2020 5:41 pm

Hi all! Could you please share your experience with ESP32+LAN8720? I need ethternet connection for my ESP32, but I've found that here can be connectivity issues and might need additional efforts (although some of them are few years old):

https://github.com/espressif/arduino-esp32/issues/2907
https://github.com/espressif/arduino-esp32/issues/3831
https://sautter.com/blog/ethernet-on-es ... g-lan8720/
viewtopic.php?t=9442
viewtopic.php?t=5732

So basically I would like to know:
1) What of ESP32 modifications is preferable, 30 pins, 38 pins, or maybe ESP32-WROOM-32D?
2) Is there any actual and full guide (wiring + programming)?

Thank you!

ESP_morris
Posts: 145
Joined: Wed Sep 05, 2018 6:23 am

Re: ESP32 + LAN8720 potential problems?

Postby ESP_morris » Fri Oct 23, 2020 3:16 am

I would say it depends on how you designed your LAN8720 board, especially the RMII clock part. You can refer to the doc here: https://docs.espressif.com/projects/esp ... ac-and-phy

The connection between ESP32 and LAN8720 is flexible, so I cant say "hey you have to connect them two in this way". And once you decided your LAN8720 design (especially the RMII clock part), then you need to configure the Ethernet component from menuconfig accordingly.

Arrovil
Posts: 2
Joined: Fri Oct 16, 2020 11:51 am

Re: ESP32 + LAN8720 potential problems?

Postby Arrovil » Tue Nov 03, 2020 2:54 pm

Thanks for reply! For now I don't have any specific requirements for connecting and I'd like to buy ESP32 with the simplest way to get work with ethernet :)

As far as I understood it would be better to use 38-pins model (with GPIO0) rather than 30-pins, just in case to have one more additional way for wiring.

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