2 files changed, 48 insertions(+), 3 deletions(-)

M build.rs
M src/lib.rs

@@ 3,7 3,8 @@ use std::process;
 fn main() {
     // Just run `make` to generate the chip definitions
     if !process::Command::new("make").status().unwrap().success() {
-        eprintln!("
+        eprintln!(
+            "
 avr-device: Running `make` resulted in a failure.
 
     Please make sure, you have all dependencies


@@ 16,7 17,8 @@ avr-device: Running `make` resulted in a failure.
 
     For more info, look at README file:
         https://github.com/Rahix/avr-device/blob/master/README.md
-");
+"
+        );
         panic!("make failed");
     }
 }

@@ 1,3 1,17 @@
+//! This crate contains register definitions for
+#![cfg_attr(feature = "atmega1280", doc = "**atmega1280**.")]
+#![cfg_attr(feature = "atmega8", doc = "**atmega8**.")]
+#![cfg_attr(feature = "atmega328p", doc = "**atmega328p**.")]
+#![cfg_attr(feature = "atmega32u4", doc = "**atmega32u4**.")]
+#![cfg_attr(feature = "attiny85", doc = "**attiny85**.")]
+//! Which chip the crate is built for depends on the feature flag used.
+//!
+//! The following chips are available (using feature flags of the same name):
+//! * `atmega1280`
+//! * `atmega8`
+//! * `atmega328p`
+//! * `atmega32u4`
+//! * `attiny85`
 #![no_std]
 #![feature(asm)]
 


@@ 18,10 32,39 @@ cfg_if::cfg_if! {
     } else if #[cfg(feature = "attiny85")] {
         pub use crate::devices::attiny85::*;
     } else {
-        compile_error!("You need to select exactly one chip as a feature!");
+        compile_error!("You need to select a chip as a feature!");
     }
 }
 
+// TODO: Find a better way to do this
+#[cfg(any(
+    all(feature = "atmega1280", any(
+        feature = "atmega8",
+        feature = "atmega328p",
+        feature = "atmega32u4",
+        feature = "attiny85",
+    )),
+    all(feature = "atmega8", any(
+        feature = "atmega1280",
+        feature = "atmega328p",
+        feature = "atmega32u4",
+        feature = "attiny85",
+    )),
+    all(feature = "atmega328p", any(
+        feature = "atmega1280",
+        feature = "atmega8",
+        feature = "atmega32u4",
+        feature = "attiny85",
+    )),
+    all(feature = "atmega32u4", any(
+        feature = "atmega1280",
+        feature = "atmega8",
+        feature = "atmega329p",
+        feature = "attiny85",
+    )),
+))]
+compile_error!("You cannot select multiple chips at once!");
+
 #[cfg(any(
     feature = "atmega1280",
     feature = "atmega8",