how to print long long int (s64_t) values using printk or printf

[Learner]

Hello,

I would like to print signed long long int (s64_t ) values using printk or printf.

I tried some suggestions I found online %lli , %lld but they did not work.

Please advise.

Thank you.

Kind regards

Mohamed

[Håkon Alseth]

Hi,

 

With ncs v1.5.0-rc1 (with minimal lib c), it should print 64 bit numbers using printk(). I added this to the hello_world sample:

	int64_t long_num = 0x10000000000;
	printk("%lli\n", long_num);

 

And it prints:

Hello World! nrf9160dk_nrf9160
1099511627776

 

Which tag are you on?

 

Kind regards,

Håkon

[Learner]

Håkon Alseth said:

Which tag are you on?

I am not sure which tag you are referring to.

[Learner]

Good morning Hakon,

Correct me if I am wrong but I think printk() does not handle float well and this is the reason I included 

Learner said:

CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

Kind regards

Mohamed

[Håkon Alseth]

Good morning Mohamed,

If you use newlib c, those needs to be set in order to use printf() with floats. printk needs "CONFIG_CBPRINTF_FP_SUPPORT" for float.

In the case of minimal libc, you should include "CONFIG_MINIMAL_LIBC_LL_PRINTF" to allow 64 bit printing.

 

Kind regards,

Håkon

[Learner]

Hi Hakon,

I am getting rather confused with what lib to use for what purpose .

I need to be able to print all types of values including float, intx_t int64_t etc... So, which lib should I be including?

Thank you.

Kind regards

Mohamed

[Håkon Alseth]

Hi,

 

Learner said:

I need to be able to print all types of values including float, intx_t int64_t etc... So, which lib should I be including?

 I would recommend that you setup a project that prints the types you want to print, via printk() and/or printf(), then set your local project configuration wrt. each standard libc, and see which one fits your needs.

 

Kind regards,

Håkon

  

[Learner]

Thank you Hakon.