Cargo Features

[dependencies]
stm32l1 = { version = "0.15.1", default-features = false, features = ["rt", "stm32l100", "stm32l151", "stm32l162"] }
default = rt

The rt feature is set by default whenever stm32l1 is added without default-features = false somewhere in the dependency tree.

rt default

Enables device of cortex-m-rt

stm32l100

Affects stm32l1::stm32l100

stm32l151

Affects stm32l1::stm32l151

stm32l162

Affects stm32l1::stm32l162

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

cortex-m-rt rt