TMS320F28388D: How to access(write/read) the PHY register using MDC/MDIO interface within ESC peripheral of 28388?

Hi Bruce,

Here's the test code as an example of writing / reading PHY registers.

/* MII Management and PHY Addressing defines */
#define ESC_MII_CTRL_STATUS_1_OFFSET         0x0510
#define ESC_MII_CTRL_STATUS_2_OFFSET         0x0511
#define ESC_PHY_ADDRESS_OFFSET               0x0512
#define ESC_PHY_REG_ADDRESS_OFFSET           0x0513
#define ESC_PHY_DATA_OFFSET                  0x0514
#define ESC_MII_ECAT_ACCESS_OFFSET           0x0516
#define ESC_MII_PDI_ACCESS_OFFSET            0x0517

    // Adding PHY configuration code here
    HW_EscWriteByte(0x01,ESC_MII_PDI_ACCESS_OFFSET); // Give PDI access to MII management

    HW_EscWriteByte(0x0A,ESC_PHY_REG_ADDRESS_OFFSET); // Set PHY register to read/write
    HW_EscWriteByte(0x01,ESC_MII_CTRL_STATUS_2_OFFSET); // Read PHY reg
    HW_EscWriteWord(0x0102,ESC_PHY_DATA_OFFSET); // Set the value to write to register
    HW_EscWriteByte(0x02,ESC_MII_CTRL_STATUS_2_OFFSET); // Write PHY reg
    HW_EscWriteWord(0x00,ESC_PHY_DATA_OFFSET); // Set the value to write to register, clearing to 0x00
    HW_EscWriteByte(0x01,ESC_MII_CTRL_STATUS_2_OFFSET); // Read PHY reg

If you want to make sense of the sequence you'll need to reference the ESC registers in Beckhoff's datasheet below:

https://download.beckhoff.com/download/document/io/ethercat-development-products/ethercat_esc_datasheet_sec2_registers_2i9.pdf

Best,

Kevin