使用LAN820和PIC32 MZ208EFM064.DrvEthEthPHixSmieRead函数总是返回DrvyEthoPHiReStudio操作

您好，我有问题使用LAN820和PIC32 MZ208EFM064.DrvEthEthPHixSmieRead函数总是返回DrvyEthoPHiReStudio操作。当我使用这个代码：= & Gt；读取值是好的，但Link失败= 1，如果我在代码之前添加这行，Link失败＝0，读取值是好的，但是Drv.EthyPHiSmiiRead没有。我如何解决这个问题？我在哪里可以找到DrvyEthPHiSmithSead（）源代码？



      以下为原文

    Hello,

I have problem to use a LAN8720 and PIC32MZ2048EFM064.

DRV_ETHPHY_SMIRead function return always DRV_ETHPHY_RES_OPERATION_ERR.

When I use this code :


    #define PHY_REG_IDENTIFIER1 (2) // reg value is 0x0007 for LAN8720
    #define PHY_REG_IDENTIFIER2 (3) // reg value is 0xC0Fx for LAN8720

    // Read operation
    EMAC1MADRbits.PHYADDR = 0; // 1- Write PHY Addr
    EMAC1MADRbits.REGADDR = PHY_REG_IDENTIFIER1; // 2- Write Reg Addr
    //printf("MIIM->read_start : ");
    EMAC1MCMDbits.READ = 1; // 3- Set Read Command
    while(EMAC1MINDbits.MIIMBUSY){printf(".");} // 4- Wait end of operation
    EMAC1MCMDbits.READ = 0; // 5- Clear Read Command
    //printf("rn");
    printf("MIIM->LINKFAIL %u, NOTVALID %urn", EMAC1MINDbits.LINKFAIL, EMAC1MINDbits.NOTVALID); // 6- control status
    printf("VALUE : 0x%04Xrn", EMAC1MRDDbits.MRDD); // 7- Get value
   
    EMAC1MADRbits.REGADDR = PHY_REG_IDENTIFIER2; // 2- Write Reg Addr
    //printf("MIIM->read_start : ");
    EMAC1MCMDbits.READ = 1; // 3- Set Read Command
    while(EMAC1MINDbits.MIIMBUSY){printf(".");} // 4- Wait end of operation
    EMAC1MCMDbits.READ = 0; // 5- Clear Read Command
    //printf("rn");
    printf("MIIM->LINKFAIL %u, NOTVALID %urn", EMAC1MINDbits.LINKFAIL, EMAC1MINDbits.NOTVALID); // 6- control status
    printf("VALUE : 0x%04Xrn", EMAC1MRDDbits.MRDD); // 7- Get value
















=> read values are good but LINKFAIL = 1

If I add this lines before my code, LINKFAIL = 0 and read values are good but DRV_ETHPHY_SMIRead doesn't operate (return DRV_ETHPHY_RES_OPERATION_ERR) :

EMAC1MCFGbits.RESETMGMT = 1;
EMAC1MCFGbits.RESETMGMT = 0;


How can I do to fix this problem ?
Where can I found DRV_ETHPHY_SMIRead() source code ?