Use std::env::var rather than env! in the build script
This will let the crate build on crates.io.
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@ -4,7 +4,7 @@ mod gen;
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use avr_mcu::*;
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use std::fs::{self, File};
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use std::io;
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use std::{env, io};
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use std::io::prelude::*;
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use std::path::{Path, PathBuf};
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@ -12,7 +12,7 @@ use std::path::{Path, PathBuf};
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/// archicectures that are not AVR.
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const DEFAULT_MCU_FOR_NON_AVR_DOCS: &'static str = "atmega328";
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const DEFAULT_FREQUENCY_HZ_FOR_NON_AVR_DOCS: &'static str = "16_000_000";
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const DEFAULT_FREQUENCY_HZ_FOR_NON_AVR_DOCS: u64 = 16_000_000;
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fn src_path() -> PathBuf {
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Path::new(env!("CARGO_MANIFEST_DIR")).join("src")
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@ -53,8 +53,11 @@ fn generate_config_module() -> Result<(), io::Error> {
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let path = src_path().join("config.rs");
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let mut f = File::create(&path)?;
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let clock = if cfg!(arch = "avr") {
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env!("AVR_CPU_FREQUENCY_HZ")
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let clock: u64 = if cfg!(arch = "avr") {
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env::var("AVR_CPU_FREQUENCY_HZ")
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.expect("Please set the '$AVR_CPU_FREQUENCY_HZ' environment variable")
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.parse()
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.expect("The $AVR_CPU_FREQUENCY_HZ environment variable is not an integer")
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} else {
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DEFAULT_FREQUENCY_HZ_FOR_NON_AVR_DOCS
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};
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