Cargo Features

STM32F469XX has no features set by default.

[dependencies]
stm32f469xx = { version = "0.4.0", features = ["rt"] }
rt

Enables device of cortex-m-rt ^0.6.3

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

cortex-m-rt rt?

Enables cortex-m-rt ^0.6.3