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  1.   Trademarks
  2. 1 Introduction
    1. 1.1 License
    2. 1.2 IwIP Version
    3. 1.3 lwIP Customization
    4. 1.4 IwIP API
      1. 1.4.1 TCP RAW APIs
      2. 1.4.2 UDP RAW APIs
    5. 1.5 lwIP Development Home Page and Support
  3. 2 Application Examples
  4. 3 Application Setup
    1. 3.1 Hardware Setup
    2. 3.2 Software Tools
  5. 4 Download and Import the Ethernet examples
  6. 5 Enet_tcpecho_server_lwip Example Overview
    1. 5.1 Build and Flash the Program
    2. 5.2 Check and Program the MAC Address
      1. 5.2.1 Using The LM Flash Programmer
      2. 5.2.2 Using the CCS
      3. 5.2.3 Using Uniflash
    3. 5.3 Configure the Terminal Window
    4. 5.4 Run the enet_tcpecho_server_lwip Example
  7. 6 Enet_tcpecho_server_static_ip_lwip Example Overview
    1. 6.1 How to Configure lwIP for Static Address
    2. 6.2 Run the enet_tcpecho_server_static_ip_lwip Example
  8. 7 Enet_udpecho_server_lwip Example Overview
    1. 7.1 Run the enet_udpecho_server_lwip Example
  9. 8 Enet_dns_lwip Example Overview
    1. 8.1 How to Configure lwIP for DNS
    2. 8.2 How to View the DNS Traffic on Wireshark
    3. 8.3 Run the enet_dns_lwip Example
  10. 9 Enet_sntp_lwip Example Overview
    1. 9.1 Run the enet_sntp_lwip Example
  11. 10Enet_tcpecho_client_lwip Example Overview
    1. 10.1 Configure the Server IP Address
    2. 10.2 Configure the SocketTest Server and Run the enet_tcpecho_client_lwip Example
    3. 10.3 Wireshark Capture for enet_tcpecho_client_lwip Example
  12. 11Enet_adcsensor_client_lwip Example Overview
    1. 11.1 Run the adcsensor_client_lwip Example
  13. 12Enet_udpecho_client_lwip Example Overview
    1. 12.1 Run the enet_udpecho_client_lwip Example
  14. 13References

6.1 How to Configure lwIP for Static Address

The lwipopts.h file allows different features to be enabled or disabled. To use static IP address, there are three steps to follow:

  1. The DHCP and AUTOIP features needs to be disabled in the lwipopts.h file. 
    #define LWIP_DHCP                       0
#define LWIP_AUTOIP                     0
  2. Define the static IP address, subnet mask and gateway mask in the enet_tcpecho_server_static_ip_lwip.c file. Note the below address is only an example. Users must change the static address per your own network, otherwise, the example will not work.
    #define IPADDR "82.254.168.192"
#define NETMASK "0.0.255.255"
#define GWMASK "0.0.255.255"
#define PORT 23
  3. Initialize lwIP with the IPADDR_USE_STATIC flag. 
    lwIPInit(g_ui32SysClock, pui8MACArray,
         inet_addr(IPADDR),
         inet_addr(NETMASK),
         inet_addr(GWMASK),
         IPADDR_USE_STATIC);
  4. Recompile the project and you are ready to run the example.