LWIP协议栈无法找到PHY device

发布于 2020-06-01 17:05:28 浏览：3102 订阅该版

```
\|1
RT -
Thread Operating System
/| \
4.0.2 build Jun 1 2020
2006 - 2019 Copyright by rt-thread team .
1wIP-2.0.2 initialized !
[222] D/drv.emac: eth hardware init success
[ 227] D/drv. emac: emac hardware start
[231] D/drv.emac: transmit frame length :350
[235] D/drv.emac: emac device init success
[240] I/sal.skt: Socket Abstraction Layer initialize success.
msh >[2135] D/drv.emac: transmit frame length :350.
[ 6145] D/drv.emac: transmit frame length :350.
[11258] E/drv.emac: No PHY device was detected, please check hardware !
[ 12266] E/drv.emac: No PHY device was detected, please check hardware !
[13274] E/drv.emac: No PHY device was detected, please check hardware !
```

本人在STM32 F767上 使用LWIP协议栈出现以上问题！
我是使用的DP83848在STM32 F767上进行LWIP协议栈的验证，配置完相应的IO口后（采用的是MII Mode）这个初始化都是通过了，但是还是一直在打印：
```
[11258] E/drv.emac: No PHY device was detected, please check hardware !
[ 12266] E/drv.emac: No PHY device was detected, please check hardware !
[13274] E/drv.emac: No PHY device was detected, please check hardware !
```
我有测量过相应的MDC MDIO都是由有波形的，那么该问题大概是因为什么导致的呢？