How to use time.h and math.h in nrf connect sdk?

[Krumita]

1)I want to use "mktime" and "localtime" in my nrf52840 code ,how do i include time.h file?

2)I am using math.h file , in prj.conf i define "CONFIG_NEWLIB_LIBC=y"  but I continuously  get error as below ,how do i resolve it?

error:

/usr/include/math.h:415:33: error: '_Float128' is not supported on this target

415 | # define _Mdouble_ _Float128

[Naeem Maroof]

Hello Krumita,

Thank you for contacting DevZone at NordicSemi.

I am not sure if we are on the same page or not, but here is what I did:

I started with hello-world sample for the nrf52840dk in the ncs v2.4.0.

I simply added:

#include <time.h>
#include <math.h>

and then I was able to use the functions defined within those headers.

To print the floating point numbers, I had to add following in the prj.config:

CONFIG_SFLOAT=y
CONFIG_CBPRINTF_FP_SUPPORT=y

I can also see there are other Kconfig options available related to the DSP and Floating points

(for example: CONFIG_FPU to enable and use the floating point unit)

Below you can see the code I have used and the output on 52840dk

BR,

Naeem