[ECOS] building something real

Gary Thomas gthomas@cygnus.co.uk
Wed Apr 19 03:16:00 GMT 2000


On 17-Apr-00 Paul Kinzelman wrote:
> Could you please point me to something that describes how to build
> something real? In other words, I've built all the tests, but haven't a
> clue how to do something on my own or to use some of the packages.
> Did I just miss the documentation for this?
> 
> For instance, the 'hello' application has only a 'main' routine. The
> other tests seem to all have a 'cyg_user_start' which looks like
> it's probably the entrypoint.
> 
> For instance, how would I create a simple eCos program to
> watch for characters to be typed and just show them on the
> screen? The EDB7xxx kbd_support.c, etc., seem to have
> just their own entrypoints that some overall null process
> must call or something. Dare I ask about a tcpip stack?
> 
> What am I missing?
> TIA!
> -PaulK
> 

There is a progression of "entry" points in eCos:
  cyg_start
  cyg_user_start
  main  
Each of these has a default behaviour and can be separately overridden.

Most of our tests use 'cyg_user_start' as the entry point, since 'main'
is only used if you are linking in the  C library functions.  If you don't
want/need the 'main()' functionality, in particular the argument stuff 
which is common in Unix style applications, using 'cyg_user_start' is
just as good.

As for "real" programs, actually looking at the TCP/IP tests would be
a good idea since these are stand alone programs, and not created in
the same fashion as the other tests in the system.



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