14.20. lwip_udpecho

14.20.1. Overview

This example shows UDP echo communication.

  • PC sends UDP data frames to MCU, and then MCU sends the data frames back to PC

14.20.2. Board Settings

  • Connect a USB port on PC to the PWR DEBUG port on the development board with a USB Type-C cable

  • Connect an Ethernet port on PC to a RGMII port or a RMII port on the development board with an Ethernet cable

14.20.3. Project Configurations

  • Ethernet Port Settings: Refer to Ethernet common project settings

  • Ethernet DHCP Configurations

    • the configurations in the CMakeLists.txt as follows:

      • sdk_compile_definitions(-DLWIP_DHCP=0): Disable DHCP feature

      • sdk_compile_definitions(-DLWIP_DHCP=1): Enable DHCP feature

14.20.4. Run Example

  • Compiling and Downloading

  • Running log is shown in the serial terminal as follows:

    This is an ethernet demo: UDP Echo (Polling Usage)
LwIP Version: 2.1.2
Enet phy init passed !
Link Status: Down
Link Status: Up
Link Speed:  1000Mbps
Link Duplex: Full duplex
IPv4 Address: 192.168.100.10
IPv4 Netmask: 255.255.255.0
IPv4 Gateway: 192.168.100.1

  • Run an Ethernet debugging tool

    • Select the protocol type: UDP

    • Select the local host address and port

    • Open

    • Select the remote host address and port

    • Enter and send any characters in the edit window

    • Watch the characters echoed from MCU

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