ESP32 IDF Ethernet library

• Attention: This library only support LAN8720.

Wires

• Be careful with the ETH clock. It is the biggest source of problems.
• I use GPIO 16 as a clock source (connected to "nINT/RETCLCK"). In this case, dont forget to correctly configure the settings in the "ETH menuconfig".

GPIO	RMII Signal	Notes
GPIO21	TX_EN	EMAC_TX_EN
GPIO19	TX0	EMAC_TXD0
GPIO22	TX1	EMAC_TXD1
GPIO25	RX0	EMAC_RXD0
GPIO26	RX1	EMAC_RXD1
GPIO27	CRS_DV	EMAC_RX_DRV
GPIO23	MDC	Output to PHY
GPIO18	MDIO	Bidirectional
GPIO16	nINT/RETCLK	Internal CLK SRC

Simple example to start Ethernet

ETH eth;
if (eth.init()) //Wait IP (DHCP) up to 20sec.
{
    ESP_LOGI("ESP32", "Connected with IP: %s", eth.get_ip());
}
else
{
    ESP_LOGE("ESP32", "Fail to connect");
}