Printf() Floats in nrf52832

[Sami]

Hello,

I've gone through the other posts regarding printf() with floats (devzone.nordicsemi.com/.../) and I still can't seem to get float to print. Currently, printf() of floats prints a blank. I've declared in system_nrf52.c "#define __FPU_USED 1". However, it doesn't seem as though the FPU nor printf() of "%f" works. My makefile already contains:

"-mfloat-abi=hard -mfpu=fpv4-sp-d16"

and

"LDFLAGS += -u _printf_float"

yet still no results. What else am I missing? I'm using Eclipse Neon (v3) with gcc.

Please advise....

[Nguyen Hoan Hoang]

If you are using newlib-nano, you need to enable printf with float support link the linker setting with flag -u _printf_float

[Sami]

Thank Nguyen, I did that and still no luck. Yes I'm using "newlib-nano". Here is a snippet of my commands from the Makefile:

LDFLAGS += --specs=nano.specs -lc -lnosys

LDFLAGS += -u _printf_float

[Nguyen Hoan Hoang]

Try with regular newlib. I just remember some version of nano does not support it. It's been a while I don't remember exactly which