ETH1 LWIP Echo Server Test

Create Vivado Project

Modify the hardware based on the previous HDMI project:

Since the default output of ZYNQ's PS using the EMIO method is GMII, and our network part (adapter card) chip RTL8211 outputs RGMII, we need to add a GMII to RGMII conversion IP module (Gmii to Rgmii).

Open the GMII TO RGMII module and change the settings as shown below.

Also, because GMII TO RGMII is active-high reset, but ZYNQ outputs an active-low reset, we need to add an inverter (search for utility, and in the retrieved options, select utility vector logic).

In the settings page, change it to not (inverter) and set the bit width to 1.

Since the configuration requirements for the network port conflict with the HDMI configuration requirements, we need to modify the ZYNQ settings:

Connect according to the diagram below:

After modifying the block design, save it, then regenerate "Generate Output Products" and "Create HDL Wrapper". Next, we need to modify the constraints file to assign pins for the Ethernet1 interface according to the schematic.

Save the constraints file, then proceed with the subsequent operations to regenerate the BIT file.

Create Vitis Project

Since it can share the same project with Ethernet0, there is no need to create a new project. However, some modifications are still needed:

In the project's code files, change the network port to Ethernet1:

Modify the lwip library files:

Modify the lwip211.mld file:

According to the software installation path, mine is at C:\Xilinx\Vitis\2021.1\data\embeddedsw\ThirdParty\sw_services\lwip211_v1_5\data. Add the following content:

  BEGIN CATEGORY emio_options
    PARAM name = emio_options, desc = "Settings for ETH using EMIO in PL";
    PARAM name = use_gmii2rgmii_core_on_eth0, desc = "Settings for ETH0 using GMII to RGMII ip core in PL", type = bool, default = false;
    PARAM name = use_gmii2rgmii_core_on_eth1, desc = "Settings for ETH1 using GMII to RGMII ip core in PL", type = bool, default = false;
    PARAM name = gmii2rgmii_core_address_on_eth0, desc = "Settings for ETH0's PHY address of GMII to RGMII ip core in PL", type = int, default = 0;
    PARAM name = gmii2rgmii_core_address_on_eth1, desc = "Settings for ETH1's PHY address of GMII to RGMII ip core in PL", type = int, default = 0;
  END CATEGORY

After that, open the BSP and modify the settings as shown in the figure below:

Modify the lwip211.tcl file (file path: C:\Xilinx\Vitis\2021.1\data\embeddedsw\ThirdParty\sw_services\lwip211_v1_5\data), and add the following content:

proc generate_lwip_opts {libhandle} {
    ....
    
    # Content added begins
    # EMIO options
    set use_gmii2rgmii_core_on_eth0 [common::get_property CONFIG.use_gmii2rgmii_core_on_eth0 $libhandle]
    set use_gmii2rgmii_core_on_eth1 [common::get_property CONFIG.use_gmii2rgmii_core_on_eth1 $libhandle]
    set gmii2rgmii_core_address_on_eth0 [common::get_property CONFIG.gmii2rgmii_core_address_on_eth0 $libhandle]
    set gmii2rgmii_core_address_on_eth1 [common::get_property CONFIG.gmii2rgmii_core_address_on_eth1 $libhandle]

    if { $use_gmii2rgmii_core_on_eth0 == true } {
       puts $lwipopts_fd "\#define XPAR_GMII2RGMIICON_0N_ETH0_ADDR $gmii2rgmii_core_address_on_eth0"
    }
    
    if { $use_gmii2rgmii_core_on_eth1 == true } {
       puts $lwipopts_fd "\#define XPAR_GMII2RGMIICON_0N_ETH1_ADDR $gmii2rgmii_core_address_on_eth1"
    }
    # Content added ends

    puts $lwipopts_fd "\#endif"
    close $lwipopts_fd
}

Similarly, after making the modifications, be sure to right-click the platform project and select Build Project:

Compile and Debug

After the project is compiled successfully, connect the development board's JTAG to the computer using a Type-C USB cable, and use another Type-C USB cable to connect the board's PS UART to the computer. Connect an Ethernet cable between the board and the computer. Open a serial debugging tool like MobaXterm on the computer and establish a connection with the development board's PS UART. Through the serial port, you can observe that the network has started, the IP address is 192.168.3.150, and the network port is port 7.

Using a Windows computer on the same router network segment (you can use the host's IP), ping this IP address. If the ping is successful, it means the network connection is established:

After connecting with a network debugging assistant, whatever data you send will be received back through the network (the port number is set to 7, and the IP address is set according to the board's IP address read from the serial port earlier). Run a TCP client on the computer: