Crate eth_phy_lan87xx 

#![no_std] MDIO driver for the Microchip LAN87xx family of 10/100 Ethernet PHYs:

• LAN8710A
• LAN8720A
• LAN8740A
• LAN8741A
• LAN8742A

Implements eth_mdio_phy::PhyDriver, so any MAC that exposes eth_mdio_phy::MdioBus can drive the chip — typical case is the ESP32 built-in EMAC SMI controller via esp_emac::mdio::EspMdio.

See the crate-level README (rendered on docs.rs and shipped via Cargo.toml’s readme field) for installation, the full embassy-net example via esp-emac, and a troubleshooting checklist covering the cold-boot ANAR quirk, MDIO bus failures, and strap-pin pitfalls.

Quick start

use eth_mdio_phy::{MdioBus, PhyDriver};
use eth_phy_lan87xx::PhyLan87xx;

let mut phy = PhyLan87xx::new(/* PHY MDIO address */ 1);
phy.init(mdio)?;
loop {
    if let Some(status) = phy.poll_link(mdio)? {
        // status.speed, status.duplex
        break;
    }
}

Crate features

Feature	Default	When to enable
defmt	off	Adds defmt::Format derives via eth-mdio-phy/defmt.

Cold-boot ANAR quirk

On a cold boot, BMCR.RESET does NOT restore ANAR to 0x01E1 on the LAN87xx family. The driver writes ANAR = 0x01E1 explicitly before kicking auto-negotiation; if you reimplement this elsewhere, do the same — see the crate README’s troubleshooting section.

Structs

PhyLan87xx

LAN87xx PHY driver (software-only, no reset pin).

PhyLan87xxWithReset

LAN87xx PHY driver with a hardware reset pin.