Subject:
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Re: A robot who knows his position
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 28 Apr 1999 08:00:27 GMT
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Viewed:
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1078 times
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In lugnet.robotics, lego-robotics@crynwr.com (John A. Tamplin) writes:
> Actually, software floating point is quite doable on the H8. In fact, at
> least egcs 1.1.[1,2] includes FP emulation (config/fp-bit.c), which gets
> put into libgcc2.a, which get merged into libgcc.a. You don't have to do
> anything special to use them -- just use float variables as normal (the H8
> port treats float and double as the same -- 32 bit floats).
This is great! I thought it was possible, but my knowledge of C isn't simply
enough to figure out HOW TO.
> You can get the various math functions typically in libm.a from glibc. It
> takes a bit of work to get them compiled, since glibc is intended for 32
> bit targets running a Unix-like OS, but I have been able to get all the
> str* functions and most of the math functions compiled and they work fine.
> Software emulation of floating point isn't terribly fast, but it is quite
> usable.
Yes, when you have floats you can use/adapt standard math libraries. I'll try
this.
> When I have the time (yeah, you've heard that before so don't hold your
> breath), I plan on releasing a configuration to use the parts of glibc that
> make sense on the RCX so you can just link your code to libc.a as usual to
> get all of these functions.
This would be of great help (not only to me I guess...)
Thanks for all your valuable info.
Mario
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Message is in Reply To:
 | | Re: A robot who knows his position
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| (...) Actually, software floating point is quite doable on the H8. In fact, at least egcs 1.1.[1,2] includes FP emulation (config/fp-bit.c), which gets put into libgcc2.a, which get merged into libgcc.a. You don't have to do anything special to use (...) (25 years ago, 27-Apr-99, to lugnet.robotics)
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