sprintf not working when converting float to string

[Bhumika]

Hi,

I am using sprintf to copy floating sensor data to a string and later copy that string in payload.

But when I do so, floating number is not copied, but rest of the numbers are copied.

I used the same code to copy floating numbers to string in nRF_SDK_Thread.

But in nRF_Connect_SDK this is not working.

Below is the code snippet:

	#define HEALTH_DATA_MESSAGE_FORMAT  "i=1&1=%d&i=5&1=%u&i=6&1=%0.2f&i=8&1=%d&i=11&1=%0.2f"

	float bat = 2.54;
	float chip_temp = 25.79;
    sprintf(buff, HEALTH_DATA_MESSAGE_FORMAT, -78, 1, bat, 3, chip_temp);
    

Output:

i=1&1=-78&i=5&1=1&i=6&1=&i=8&1=3&i=11&1=

[ovrebekk]

Hi

Could you try to add the following line to your prj.conf file, and rebuild the project?

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

Best regards
Torbjørn