Floating point issue on Raspberry PI

ChibiOS public support forum for all topics not covered by a specific support forum.

Moderators: utzig, lbednarz, tfAteba, barthess, RoccoMarco

robu
Posts: 25
Joined: Sat Nov 24, 2012 3:39 pm

Re: Floating point issue on Raspberry PI

Postby robu » Sat Dec 01, 2012 5:04 pm

Hi,

It's the same effect I'm getting just 0.000

Regards,
Robert

gmb42
Posts: 31
Joined: Tue Oct 02, 2012 8:09 pm
Location: Aberdeenshire, UK

Re: Floating point issue on Raspberry PI

Postby gmb42 » Sat Dec 01, 2012 7:34 pm

Are you sure the object file for chprintf got recompiled? Did you "make clean"? I tripped over that when I was trying to get fp output last week.

robu
Posts: 25
Joined: Sat Nov 24, 2012 3:39 pm

Re: Floating point issue on Raspberry PI

Postby robu » Sat Dec 01, 2012 9:56 pm

If I don't set the CHPRINTF_USE_FLOAT flag than insted of the number it will print out only a f

gmb42
Posts: 31
Joined: Tue Oct 02, 2012 8:09 pm
Location: Aberdeenshire, UK

Re: Floating point issue on Raspberry PI

Postby gmb42 » Sat Dec 01, 2012 10:08 pm

OK, I'm out of advice now, it works for me on an STM32F4.

robu
Posts: 25
Joined: Sat Nov 24, 2012 3:39 pm

Re: Floating point issue on Raspberry PI

Postby robu » Sat Dec 01, 2012 10:11 pm

Thanks for your help.

mabl
Posts: 417
Joined: Tue Dec 21, 2010 10:19 am
Location: Karlsruhe, Germany
Been thanked: 1 time
Contact:

Re: Floating point issue on Raspberry PI

Postby mabl » Sun Dec 02, 2012 9:10 am

Wasn't there once an issue with varargs and floating point? Which also never got solved and the "toolchain" got the blame? I'd wager this is the same case.

What is the status of the raspberry Pi Port? I guess it needs a recommended toolchain and working debugging. OpenOCD should support it, right?

User avatar
Badger
Posts: 346
Joined: Mon Apr 18, 2011 6:07 pm
Location: Bath, UK
Contact:

Re: Floating point issue on Raspberry PI

Postby Badger » Mon Dec 03, 2012 11:23 am

mabl wrote:Wasn't there once an issue with varargs and floating point? Which also never got solved and the "toolchain" got the blame? I'd wager this is the same case


I've experienced the same issues with STM32. I never found the time to get to the bottom of it, I just printed a scaled integer instead. There's some more info here.

robu
Posts: 25
Joined: Sat Nov 24, 2012 3:39 pm

Re: Floating point issue on Raspberry PI

Postby robu » Mon Dec 03, 2012 2:54 pm

Thanks for the help, I will give a try.

robu
Posts: 25
Joined: Sat Nov 24, 2012 3:39 pm

Re: Floating point issue on Raspberry PI

Postby robu » Wed Dec 19, 2012 9:02 pm

Hi,

Finally I figure it out the problem.

There was the stack initialization problem, I added

Code: Select all

mov sp,#0x8000


to the vector.s and now it is working

Robert


Return to “General Support”

Who is online

Users browsing this forum: No registered users and 6 guests