Arduino for STM32

is it possible to say the compiler not to use the fpu?

fpiSTM wrote: Sat Oct 17, 2020 3:45 pm My 2 cents is that some rounding in the operation...

Maybe but why only when using fpu ?

I have blackpill too.
I use VS Code with PlattfomIo. Using as standard STM32Duino
it makes no difference when I use arduino IDE.

The Sample from github is for a MPU9250. There a Quaternions and Kalman Filter calculated. So my thought is a problem when compiler use FPU.

thats not so easy to explain.
Board is a Blackpill with STM32f411.

[env:blackpill_f411ce]
platform = ststm32
board = blackpill_f411ce
framework = arduino

The code was written for the sam21d.
On sam after reset Kompass are fast in right direction. On the 411 compas starts count from 0 up to 50 ...

Hello I have problems with the sparkfun dmp libary. https://github.com/sparkfun/SparkFun_MPU-9250-DMP_Arduino_Library

Lib runs fine on Sam21d (m0 without FPU)

on the 411 filter is not working correct. I think it is a problem of the FPU. Any suggestions ?
there are other libs witch have same ...

Thanks a lot. Thats what I was looking for!

Hi, someone could tell me how change the default pinspack (PB6,PB7) for a STM32f407 MCU?

thanks in advance