Re: [lwip-users] lwIP and Ping

[Simon Goldschmidt]

> I have looked through all of the files many times.  But I think you are
> missing the point that I am working on an embedded MCU LPC2468 with
> FreeRTOS.  There is no Windows, Unix, uLinix, or anything else that
> contains
> implementation of sys/time.h  for me.  I have to come up with an
> alternative.

Of course you do. That's why it's called a port: you have to implement all the 
functions in sys_arch.c (and correct all the defines and typedefs in cc.h and 
sys_arch.h) to fit your compiler, platform and OS. But the ports for unix and 
win32 show you what you need to implement. Of course, you cannot simply copy 
them (unless FreeRTOS provides a win32 compatibility layer, hehe).

Doing this is not that much work, but still it requires some time which is why 
most people share their ports. So if you have a FreeRTOS port, you should 
already have most of the functions. Doesn't this OS support some kind of timing 
function? Most OSes provide a simple counter that counts the timer interrupt 
ticks. If you know the timer's interval, you can calculate back the 
(milli-)seconds (since booting).

Simon
-- 
Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: 
http://www.gmx.net/de/go/multimessenger