flaoting point math in Ride7?

sima · ‎2009-03-20

Posted on March 20, 2009 at 08:42

sima · ‎2011-05-17

Posted on May 17, 2011 at 13:06

Why don’t simple floating point operations work in my compiled code? I'm using Ride7.

Or must I have to activate floating point math somehow?

Try this for example:

float x, y;

x = 1000.0;

y = x * 2.0; // Works

y = x * 0.5; // Error

y = x / 2.0; // Error

Insane results. :o

brunoalltest · ‎2011-05-17

Posted on May 17, 2011 at 13:06

Although it should not be necessary, Try

#include

guyvo67 · ‎2011-05-17

Posted on May 17, 2011 at 13:06

Hi,

I did the test also and you're right.

I get something 1.1E-38 for the multiplication. (viewed in the simulator)

Maybe there must be some float library be added. But I can't find in the linker config tab.

Be careful tough that you must be aware of compiler optimizations. Better to write volatile in front of your float than you're sure. But I tested it without optimizations on and gave the same wrong result.

So indeed we are missing something here.

PS

It's not needed to do any include normally to work with a float type. But it can be necessary to link with some dedicated float library for the target. ( It's the same with AVR targets based on gcc dists)

sima · ‎2011-05-17

Posted on May 17, 2011 at 13:06

Hello again, the problem is solved.

I have located the floating point bug to Ride7's internal simulator.

When I tried the same code in hardware it debuggs ok.

guyvo67 · ‎2011-05-17

Posted on May 17, 2011 at 13:06

Ok thx for letting me know.

Maybe you can post this bug to the ride7 people.