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Connect LAN8720 PHY to the ESP32

I spotted a post asking about using LAN8720 with ESP32.  Sergey indicated that there is a plan to support this which is great.

It's clear in the ESP32 datasheet which pins are for the MII interface but not clear which are used when using the RMII interface.  I'd like to ensure I don't use the pins for something else, is anyone able to advise?


  • SergeySergey Dublin, Ireland
    @Eskibrew , do you have a hardware at hand to work with?
    We don't have any ethernet-equipped module delivered yet..
  • edited May 2017
    Thanks Sergey, Yes, I have ESP-Wroom32 and a couple of Waveshare LAN8720 modules.
    I can post you a Waveshare LAN8720 module if that would help?

    Alternatively, I'm happy to try stuff out here :-)

    Really liking mongoose-os - I need to talk to you about commercial licence at some point when I have a prototype working...
  • SergeySergey Dublin, Ireland
    what a neat-looking ethernet module. yeah, if you send one of those it might speed up things.
    what is the prototype you're working on, can you reveal please?
  • Ok, great. I'll post one today.  Is this the right address:
    Office 68
    The Design Tower
    Trinity Enterprise Centre
    Pearse St.
    Dublin 2

    Happy to discuss project offline, can I email you? - is it
  • SergeySergey Dublin, Ireland
    the address is correct, thanks.
    let's connect on skype, my login is schwortz, i'll be online in about 1h.
  • Ok, will do - you should have a contact request.  Buzz me when you're ready.
  • SergeySergey Dublin, Ireland

    Got the module, thank you Martin! Starting to work on it.

  • Brilliant, thanks for confirming receipt B)

  • SergeySergey Dublin, Ireland

    Could you share the breakout you're using please?

  • edited May 2017

    Breakout? - I'm using an ESP-WROOM-32 at the moment - is that what you mean?
    - Ah no, you probably mean the DIP module - hang on, will check...
    - ESP32-DEVKITC B)

  • Hi Eskibrew,

    Is the module LAN8720 already working with ESP32 using Mongoose-OS?
    I'm working on it, but no success yet.... only with Arduino IDE


  • Yes, it's working fine - has been for some months now :smile:

  • vipulgargvipulgarg New Delhi, India

    @Eskibrew i am using Waveshare Lan8720 board its working fine, but when i implement the same circuit on my board its hard to get on working.

  • edited September 2018

    Hi @vipulgarg. I have implemented my own board using the chip and it works fine.
    Initially though it would not work and it took me ages to realise I had not connected Vdd-IO pin on Lan8720. Once I fixed that, it worked perfectly. I'd suggest that you check your prototype very carefully as it should work :-)

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