change STM32F4x7_ETH_LwIP_V1.1.1 PHY from DP83848CVV to LAN8720
試驗緣由 我移植了 STM32F4 + ucosii + lwip + lan8720, 編譯過了，發現網卡ping不通。 單步發現，網卡初始化都沒過. 卡死在下面的實現html while (ETH_GetSoftwareResetStatus() == SET); 經過單步能正常運行的第三方工程，發現個人試驗工程GPIO初始化錯了。en.stsw-stm32070的PHY是DP83848CVV
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