newlib printk float formatting not working

[gdf8gdn8]

Describe the bug
printk for foating point value not working.
printf format expected also in serveral drivers LPS25HB.

Code

float f= 123,456712356;
printk("%.6f\n",f);

Output

%.6f

Expected behavior

123,456712

Environment (please complete the following information):

• OS: ArchLinux, Ubuntu 20.4
• Toolchain
  -- zephyr-sdk-0.11.4
  -- west v0.8.0
  -- zephyr v2.3.0-2198
• config: CONFIG_NEW_LIBC_FLOAT_PRINTF=y

[ArseniSoitu]

Hello. May be the reason is #31168 bug? Struggled with it several days ago.

[pabigot]

printk uses a Zephyr-internal formatting utility now; you don't need to select newlib for that unless you're using standard C functions like printf(). See this documentation. You'll want CONFIG_CBPRINTF_FP_SUPPORT=y.

[pabigot]

Ah; I see you seem to be using a Zephyr version before 2.4.0 was released. printk didn't support FP back then. The solution I recommended is available in the current development version and will be in 2.5 in about a month.

[gdf8gdn8]

Ah; I see you seem to be using a Zephyr version before 2.4.0 was released. printk didn't support FP back then. The solution I recommended is available in the current development version and will be in 2.5 in about a month.

It was fixed in v2.4.0. I updated to v2.4.0.

[pabigot]

Great; thanks for the update.