How can floating-point arithmetic be utilized on the NRF5340 microcontroller with the Zephyr real-time operating system?

[Anthony Shivakumar]

I'm attempting to perform PID control system calculations on the NRF5340 microcontroller. However, when I perform any floating-point computations, the result is always 0. I've tried enabling the following settings in prj.conf:

#CONFIG_FPU=y #CONFIG_FPU_SHARING=y

Unfortunately, enabling floating-point support causes the NRF5340 to crash. I'm having trouble understanding why floating-point operations are not functioning correctly. Could you please assist me in identifying any potential mistakes and determining the necessary settings to enable proper floating-point arithmetic? Thank you for your assistance.

[Hieu]

Hi Anthony,

I cannot reproduce your issue. Floating point math works for me, whether FPU is enabled or not.

Could you please review your code to see if you are inadvertently implicitly casting the calculation values to int types?

Hieu

[Anthony Shivakumar]

Let me retest and get back to you.

[Anthony Shivakumar]

I am able to see floating point math when running a new thread. Thank you!

[Hieu]

It should work on any thread though. Please review just in case.

If things work for you, please feel free to close this ticket at your convenience.

P.s: I noticed you closed the ticket, but it was reopened accidentally when you replied. I will close it again then.