Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


How to use lwip

Posted by Bill Yang on July 8, 2009
Hi, I've used FreeRTOS v5.0.3 with the demo of CORTEX_LM3Sxxxx_Kail. This demo has used uIP as webserver application. I also see there is another application lwIP under the Common/ethernet folder. Please pardon me for below questions that I want to a shortcut to learn the lwIP stuffs.

I wonder if I can replace the lwIP application to uIP application in LM3Sxxxx_Kail demo. But I don't know how to do. Does some one have done already? so can I get a sample?

Also I wonder if there is any document like user manual or readme file regarding how to use lwIP. I only saw a couple FILES for describing a file tree. Is there document online?

Third, there is SNMP folder with files under the core folder. Does this mean the lwIP is supporting SNMP implementation? Because my project has a Ethernet switch controller by LM3S6965, the application needs to run SNMP.

Bill Yang

RE: How to use lwip

Posted by Richard on July 9, 2009
I have an lwIP Stellaris example sent by a third party that I can send to you as a starting point. Write to me at r (dot) barry [at] freertos.org.


RE: How to use lwip

Posted by Patrick DEFLANDRE on July 9, 2009
The best place for an lwIP online help is here :


I don't know about uIP, but lwIP use three kind of API :
- a raw API, which is useful an OS less system,
- netconn API, which is specific to lwIP an is use with an OS
- a BSD like socket API

If your uIP example use socket, then you could certainly adapt it to lwIP without pain.
But if this uIP use a specific API like a raw or netconn API, then you will probably find more problems to adapt it to lwIP.

As for SNMP, I don't have use it for now. But as far as I know, it is supported by lwIP.

[ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ]

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

Meet us at Embedded World. Hall 3A-525.

Hear from Richard Barry at Embedded World. Feb 28, 16:00, Hall 4-428.

Video: Watch James Gosling & Richard Barry at re:Invent, Las Vegas 2017.

FreeRTOS kernel V10.0.1 is available for immediate download. Now MIT licensed.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS