CC2640R2F: math function roundf() - round to nearest

JeanR

Intellectual 331 points

Part Number: CC2640R2F

Hi!

I am trying to round a number to nearest integer, meaning:

2.3 => 2

2.7 => 3

2.5 => 3

Which function is correct to use here? round() yields only the number before the comma, so it behaves like floor().

Or better, where do I find the documentation of the math functions for CC2640R2F SDK?

Thanks!

over 5 years ago

0 JeanR over 5 years ago

Intellectual 331 points

I am also noticing that variables of type double seem to be not treated as a floating point number. Am I missing some kind of setting?

For example:

double myTemp = 554257 / 80000;

print( " %d", (int)(myTemp * 1000) );

=> ' 6000' instead of expected '6928'

What am I missing?

0 daniel_o over 5 years ago in reply to JeanR

TI__Genius 10690 points

JeanR,

Are you including math.h in your project? I included math.h and ran a similar test:

You can read more about various methods of printing here: https://dev.ti.com/tirex/explore/node?node=ACAmHpRsYbFcPWGPpQxoUA__krol.2c__LATEST

You may need to add floating point support to your System.extendedFormats. See here: https://e2e.ti.com/support/tools/ccs/f/code-composer-studio-forum/824672/ccs-cc2640r2f-display_print-using-f-or-float-format-does-not-work/3050721#3050721

Regards,

Daniel

0 JeanR over 5 years ago in reply to daniel_o

Intellectual 331 points

Hi Daniel!

yes, math.h is included.

CCS level of printf is set to 'full'

The link in the link to the post does not work - I guess you tried to refer to the System.extendedFormats.

=> Could you please put a direct link or tell me what that is about?

I have not yet heard of System.extendedFormats so I don't know where to start with it in CCS. Is it documented in TI SDK or CCS docs somewhere?

Thanks!

Jean

+1 daniel_o over 5 years ago in reply to JeanR

TI__Genius 10690 points

Jean,

Essentially, you need to add the following to your .cfg file to enable floats in print.

System.extendedFormats = '%$L%$S%$F%f';

I also linked to the "Print" SimpleLink Academy so you can see an explanation of different methods of printing/debugging. Floats can require a lot of memory overhead and some debug/print methods are more efficient than others.

Regards,

Daniel

Bluetooth®︎

Bluetooth forum

CC2640R2F: math function roundf() - round to nearest