Small sections about performing math functionality

[robamu]

Correct me if I am missing any information, but I was not able to use some standard float operations like floor and ceil and I required those when calculating register values for a HAL. Am I missing a necessary import for this? I now added the libm dependency and was able to use the floorf functions for my purposes, but I think not being able to use functions like floor is related to having the #[no_std] attribute on the application?

If that is the case, it might be worth an idea to add a small section related to how to perform some basic math operations which are reserved to std normally

[eldruin]

That is correct. It would be great if you could contribute that small section about this in a PR.

[robamu]

Unfortunately, I'm not an expert (yet), I only stumbled upon this when trying to do floating point calculation on a MCU. I could try to get some information about which math operations are allowed and which ones are reserved to std . I might do some research. Maybe someone already compiled a list or something similar? Then I could try to contribute a small section about this topic.

[robamu]

A related RFC can be found here: rust-lang/rfcs#2505