ETH_ERR_AUTONEG_TIMEOUT
embedded
communication_error
ai_generated
true
ETH：PHY自协商超时，持续5000毫秒后失败
ETH: PHY autonegotiation timeout after 5000ms
ID: embedded/eth-phy-autonegotiation-timeout
75%修复率
88%置信度
1证据数
2024-01-10首次发现
版本兼容性
| 版本 | 状态 | 引入 | 弃用 | 备注 |
|---|---|---|---|---|
| STM32H7 ETH driver v2.0.1 | active | — | — | — |
| LWIP v2.1.3 | active | — | — | — |
| PHY LAN8742A | active | — | — | — |
根因分析
PHY设备在配置的超时时间内未能完成自协商，原因可能是链路伙伴不兼容或网线故障。
English
PHY device failed to complete autonegotiation within the configured timeout due to incompatible link partner or faulty cable.
官方文档
https://www.st.com/resource/en/application_note/an4606-ethernet-phy-interfacing-with-stm32-mcus-stmicroelectronics.pdf解决方案
-
Force the PHY to a specific speed/duplex (e.g., 100Mbps Full Duplex) using: `phy_write(PHY_CTRL_REG, MII_CR_SPEED_100 | MII_CR_FULL_DUPLEX | MII_CR_RESTART_AUTONEG)`
-
Check and replace the Ethernet cable, then reset the PHY: `phy_reset(phy_dev); HAL_Delay(100); phy_autonegotiate(phy_dev);`
无效尝试
常见但无效的做法:
-
60% 失败
If the root cause is link partner incompatibility or cable fault, increasing timeout only delays the failure; autonegotiation will still fail.
-
90% 失败
Looping without fixing the underlying issue can cause an infinite retry loop, blocking other tasks and consuming CPU cycles.