Cargo Features

ch569-pac has no features set by default.

[dependencies]
ch569-pac = { version = "0.1.0", features = ["rt", "critical-section"] }
rt = riscv-rt
critical-section

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.

riscv-rt rt?

Enables riscv-rt ^0.9.0