sprintf floating point support NCS

[LukeC]

I cannot seem to get floating point supoort for printf/scranf 

It works for LOG_INF

    sprintf(str,"nopad: %f pad %2.1f\r\n", f,f );
    printk(str);

    printf("nopad: %f pad %2.1f\r\n", f,f);

    LOG_INF("Testing padded float %2.1f",f);

nopad: 0.000000 pad -nan

nopad: 0.000000 pad -nan

[00:00:01.373,535] <inf> display: Testing padded float 3.4

I have tried the following .conf settings:

CONFIG_NEWLIB_LIBC=y

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

CONFIG_CBPRINTF_FP_SUPPORT=y

CONFIG_CBPRINTF_COMPLETE=y

[Håkon Alseth]

Hi,

 

Your printk should be printk("%s", str).

 

I took hello_world, added these to prj.conf:

CONFIG_CBPRINTF_COMPLETE=y
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_CBPRINTF_FP_SUPPORT=y

 

Added your functions:

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <sys/printk.h>
#include <math.h>
#include <stdio.h>

void main(void)
{
	printk("Hello World! %s\n", CONFIG_BOARD);
	float f = 0.1234f;
	char str[100];
	sprintf(str,"nopad: %f pad %2.1f\r\n", f,f );
	printk("sprintf: %s\n",str);

	printf("nopad: %f pad %2.1f\r\n", f,f);

}

 

And here's the output:

*** Booting Zephyr OS build v3.1.99-ncs1  ***
Hello World! nrf5340dk_nrf5340_cpuapp
sprintf: nopad: 0.123400 pad 0.1

nopad: 0.123400 pad 0.1

 

Which ncs version are you running on? I am currently on ncs v2.1.0

 

Kind regards,

Håkon

[LukeC]

It must have been some build issue or overlay conflict because it is working now.