legacy reference: https://www.electrodragon.com/w/Ethernet#LAN8720_Ethernet_with_ESP
hardware
| ESP32 | func | Ethernet | Note |
|---|---|---|---|
| GPIO 17 | PHY_POWER | Osc_PWR (PHY_pwr) | obselete pin |
| GPIO 22 | EMAC_TXD1 | TX1 | |
| GPIO 19 | EMAC_TXD0 | TX0 | |
| GPIO 21 | EMAC_TX_EN | TX_EN | |
| GPIO 26 | EMAC_RXD1 | RX1 | |
| GPIO 25 | EMAC_RXD0 | RX0 | |
| GPIO 27 | EMAC_RX_DV | CRS | |
| GPIO 00 | EMAC_TX_CLK | nINT/REFCLK | CLK IN |
| GPIO 23 | SMI_MDC | MDC | |
| GPIO 18 | SMI_MDIO | MDIO | |
| GND | GND | ||
| 3V3 | VCC |
Crystal
- active 50MHz
jumper setup
IO 17 – Osc_PWR (PHY_pwr)
3-way jumper
- NC (Not connect)
- connected
2-way jumper
- Add pull down 4.7K
IO0 – CLK
2-way jumper (left)
- 4k7 pull up
- the boot may still not improve much with this pull up
2-way jumper (right)
- connected
The final jumper setup please refer the image blow
demo code output
the demo code parts
WiFi.onEvent(WiFiEvent); may need fix
Normal output
setup done
connecting to 163.com
HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Tue, 25 Apr 2023 07:01:33 GMT
Content-Type: text/html
Content-Length: 178
Connection: keep-alive
Location: http://www.163.com/
<html>
<head><title>301 Moved Permanently</title></head>
<body bgcolor="white">
<center><h1>301 Moved Permanently</h1></center>
<hr><center>nginx</center>
</body>
</html>
closing connection
ETH status0, ETH MAC: 84:0D:8E:C8:8C:67, IPv4: 192.168.1.173, FULL_DUPLEX, 100Mbps
Bug
- ESP32 board may fail on start, you may need to press reset "EN" buttons a few times to get correct boot
demo
- https://t.me/electrodragon3/201
ref
-
https://www.electrodragon.com/w/Ethernet#LAN8720_Ethernet_with_ESP
- arduino-IDE-DAT please find demo code in arduino-ESP32
- NWI1199