Use 'avr-config' for CPU frequency logic rather than reimplement it

This crate is also used by the 'delay' crate.

Cargo.toml

@@ -28,6 +28,7 @@ default = ["avr-std-stub"]
 all-mcus = []
 
 [dependencies]
+avr-config = "1.0"
 avr-std-stub = { version = "1.0", optional = true }
 const_env--value = "0.1"
 target-cpu-macro = "0.1"

src/config.rs

@@ -1,13 +0,0 @@
-#[cfg(target_arch = "avr")] use const_env::value_from_env;
-
-/// The clock frequency of device being targeted in Hertz.
-#[cfg(target_arch = "avr")]
-pub const CPU_FREQUENCY_HZ: u32 = value_from_env!("AVR_CPU_FREQUENCY_HZ": u32);
-
-/// The clock frequency of device being targeted in Hertz.
-///
-/// This value is arbitrarily set to 16MHz as this crate is currently being targeted for a non-AVR
-/// device.
-#[cfg(not(target_arch = "avr"))]
-pub const CPU_FREQUENCY_HZ: u32 = 16_000_000; // Choose a nice default when not targeting AVR.
-

src/lib.rs

@@ -24,7 +24,7 @@ pub mod interrupt;
 pub mod modules;
 
 /// Configuration for the currently-targeted microcontroller.
-pub mod config;
+pub use avr_config as config;
 
 mod register;
 mod pin;