[ECOS] Stack usage measurement

Gary Thomas gary@mlbassoc.com
Mon Apr 20 10:52:00 GMT 2009


Ross Younger wrote:
> Szentirmai Gergely wrote:
>> Does anybody has a estimation about the stack usage of pintf stuff? [...]
>> As a summary, I would have to avoid the usage of any printf if I'm short
>> of memory?
> 
> printf (or, more precisely, the actual format conversion in vfnprintf) is
> really quite a complicated function. This regularly bites people on limited
> targets; sometimes simply using printf is enough to cause your application
> to fail to link because it won't fit into RAM.
> 
> If you don't need to print out floating point numbers, you might save a
> little code size by disabling that support in your eCos config. Otherwise,
> puts and putc are pretty lean and mean - you could save a lot of code and
> stack if you can avoid printf in your application.

Good points, but 'diag_printf()' is already quite stripped; no floating point.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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