esp32+lan8720+rc522

rueham
Posts: 2
Joined: Sat Jun 10, 2023 7:15 pm

esp32+lan8720+rc522

Postby rueham » Sat Jun 10, 2023 7:34 pm

Hello everyone!

I'm trying to read rfid-cards with rc522 and send info via ethernet on esp32wroom38pin. I have scheme to connect and it worsk well separately.

But scheme shows same pins for modules. I know I can change 18 and 32 pins for lan8720 and assign to others and it works. My problem is one common pin 19. Is it possible to change 19 pin for lan9720 or rc522? Or any other way to use both modules on my esp. I'm newbie any help appreciated.

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rueham
Posts: 2
Joined: Sat Jun 10, 2023 7:15 pm

Re: esp32+lan8720+rc522

Postby rueham » Tue Jun 13, 2023 10:42 pm

You can remove my post and delete my acc since this forum gives nothing

Pistolinhadura
Posts: 2
Joined: Sun Aug 13, 2023 8:06 pm

Re: esp32+lan8720+rc522

Postby Pistolinhadura » Sun Aug 13, 2023 8:08 pm

Aorry for it dude, i pass throug the same, and i can't solve, did you find one way to that?

ESP_ondrej
Posts: 207
Joined: Fri May 07, 2021 10:35 am

Re: esp32+lan8720+rc522

Postby ESP_ondrej » Mon Aug 14, 2023 11:09 am

You cannot change GPIO for RMII EMAC. However, you can use whatever IO pin (via IO Matrix) for SPI if you don't need high speed SPI CLK (more than 26.6 MHz).

Pistolinhadura
Posts: 2
Joined: Sun Aug 13, 2023 8:06 pm

Re: esp32+lan8720+rc522

Postby Pistolinhadura » Wed Aug 23, 2023 3:44 am

ESP_ondrej wrote:
Mon Aug 14, 2023 11:09 am
You cannot change GPIO for RMII EMAC. However, you can use whatever IO pin (via IO Matrix) for SPI if you don't need high speed SPI CLK (more than 26.6 MHz).
so, how would you recommend me to connect all lan8720 with rfid? I didn't understand very well how all this would have to be done, if you could I would be grateful

ESP_ondrej
Posts: 207
Joined: Fri May 07, 2021 10:35 am

Re: esp32+lan8720+rc522

Postby ESP_ondrej » Wed Aug 30, 2023 7:42 am

Read documentation at https://docs.espressif.com/projects/esp ... ac-and-phy and get familiar with REF RMII CLK options. In case of LAN8720, I recommend to use GPIO17 as CLK source to avoid board reset and startup issues, see https://www.crowdsupply.com/silicogniti ... reset-saga. However note, that you need WROOM module to be able to use GPIO16/17 since WROVER modules use these pins for PSRAM. In addition make sure, there is no oscillator on your LAN8720 dev board.
Then connect the remaining LAN8720 pins to GPIO as described at https://github.com/espressif/esp-idf/tr ... s/ethernet

SPI device can be connected to whatever pins left unconnected. However, I recommend avoiding using ESP32 bootstrap pins. They can be handled but it requires extra care so it is better to not use them for simplicity. Check the modules datasheet to find which pins are bootstrap.

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