I am trying to develop an application using FREERTOS on AT91SAM7X .
But I am unable to find a small example application to build up.can u pls send me a small example application.

There are three in the download:

http://www.freertos.org/portsam7xiar.html
http://www.freertos.org/portsam7xlwIP.html#CommandLineUsage
http://www.freertos.org/portsam7xlwIP.html

Regards.