RE: [rtl] rtl_printf an floating point

[<bionic@vassalboro.bu.edu>]

When I know the approximate magnitude of my numbers,
I just typecast to int to get floating point with kernel
printf versions...

rtl_printf("My number is %de-6",(int)(foo_float * 1e6));

-Chuck


On Wed, 7 Mar 2001, Dresner, Norman A. wrote:

> I believe you can't.  Even though you can specify that a real-time
> module/task/thread can use the math coprocessor (I'm assuming your in an x86
> architecture), the kernel versions of printf don't support floating point
> conversions.
> 
> I think that the best you can do is to send the data to a user-task via a
> real-time FIFO (or dump the data into shared memory) for printing.
> 
> Norman Dresner
> Fellow Systems Engineer
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> > -----Original Message-----
> > From:	joseph canou [SMTP:Joseph.Canou@bourges.univ-orleans.fr]
> > Sent:	Wednesday, March 07, 2001 7:54 AM
> > To:	rtl@rtlinux.org
> > Subject:	[rtl] rtl_printf an floating point
> > 
> > hello
> > i am using floating point in rt module and i would like to see some
> > results (for debugging) by using rtl_printf
> > but if i write  rtl_printf("%f", var) with var declared as double i just
> > see   %f   in /var/log/messages
> > how can i do to see this var value?
> > i use rtl3.0 pre9
> > thank you for your help
> > 
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