RE: sprintf floating point support NCS

LukeC — Thu, 27 Oct 2022 17:47:52 GMT

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

RE: sprintf floating point support NCS

Håkon Alseth — Thu, 27 Oct 2022 09:02:03 GMT

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