How to print floats with NRF_LOG macros

[mokincha]

Trying to print floats with NRF_LOG functions always prints a value of 0.00000.

E.g.

float value = 123.456; NRF_LOG_ERROR( "Float %f\r\n", value );

prints:

ERROR:Float 0.00000

but NRF_LOG_ERROR( "Float %u\r\n", (uint16_t)value );

prints

ERROR:Float 123

I have the _printf_float linker option enabled. It's clear from the output that something is recognizing the float param and handling it. How can I print floats to the LOG output?

Printing a char* string variable with "%s" also fails to compile.

[Turbo J]

There are special macros available for float values:

NRF_LOG_ERROR( "Float " NRF_LOG_FLOAT_MARKER "\r\n", NRF_LOG_FLOAT(value));

Note: These macros wrongly show values -1.0<value<0.0 as positive.

Printing a char* string variable with "%s" also fails to compile.

Try using nrf_log_push(). The -Werror gcc option may be incompatible with NRF_LOG_ functions.

[GT]

The macros shows correct values even between -1.0<value<0.0 

[awneil]

Note that you are replying to a two year old thread - presumably, it has been fixed in the meantime?

Which SDK version(s) are you referring to?

A similar bug exists (existed?) in the Thingy code:

https://devzone.nordicsemi.com/f/nordic-q-a/47223/error-in-thingy-52-environment-service---temperature