ruduino/core_generator/build.rs

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extern crate avr_mcu;
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mod gen;
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use avr_mcu::*;
use std::fs::{self, File};
use std::io;
use std::io::prelude::*;
use std::path::{Path, PathBuf};
/// The MCU that will be assumed when running 'cargo doc' targeting
/// archicectures that are not AVR.
const DEFAULT_MCU_FOR_NON_AVR_DOCS: &'static str = "atmega328";
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fn src_path() -> PathBuf {
Path::new(env!("CARGO_MANIFEST_DIR")).join("src")
}
fn cores_path() -> PathBuf {
src_path().join("cores")
}
fn core_module_name(mcu: &Mcu) -> String {
mcu.device.name.to_lowercase().to_owned()
}
fn main() {
if !cores_path().exists() {
fs::create_dir_all(&cores_path()).expect("could not create cores directory");
}
let current_mcu = if cfg!(arch = "avr") {
avr_mcu::current::mcu()
.expect("no target cpu specified")
} else {
avr_mcu::microcontroller(DEFAULT_MCU_FOR_NON_AVR_DOCS)
};
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generate_config_module().unwrap();
generate_cores(&[current_mcu]).unwrap();
}
fn generate_cores(mcus: &[Mcu]) -> Result<(), io::Error> {
for mcu in mcus {
generate_core_module(mcu).expect("failed to generate mcu core");
}
generate_cores_mod_rs(mcus)
}
fn generate_config_module() -> Result<(), io::Error> {
let path = src_path().join("config.rs");
let mut f = File::create(&path)?;
let clock = env!("AVR_CPU_FREQUENCY_HZ");
writeln!(f, "/// The clock frequency of device being targeted in Hertz.")?;
writeln!(f, "pub const CPU_FREQUENCY_HZ: u32 = {};", clock)?;
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Ok(())
}
fn generate_core_module(mcu: &Mcu) -> Result<(), io::Error> {
let path = cores_path().join(format!("{}.rs", core_module_name(mcu)));
let mut file = File::create(&path)?;
write_core_module(mcu, &mut file)
}
fn generate_cores_mod_rs(mcus: &[Mcu]) -> Result<(), io::Error> {
let path = cores_path().join("mod.rs");
let mut w = File::create(&path)?;
writeln!(w)?;
for mcu in mcus {
let module_name = core_module_name(mcu);
writeln!(w, "/// The {}.", mcu.device.name)?;
writeln!(w, "pub mod {};", module_name)?;
writeln!(w, "#[cfg(all(target_arch = \"avr\", target_cpu = \"{}\"))]", module_name)?;
writeln!(w, "pub use self::{} as current;", module_name)?;
}
writeln!(w)
}
fn write_core_module(mcu: &Mcu, w: &mut Write) -> Result<(), io::Error> {
writeln!(w, "//! Core for {}.", mcu.device.name)?;
writeln!(w)?;
writeln!(w, "use {{RegisterBits, Register}};")?;
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writeln!(w, "use modules;")?;
writeln!(w)?;
gen::write_registers(mcu, w)?;
gen::write_pins(mcu, w)?;
gen::write_spi_modules(mcu, w)?;
gen::write_usarts(mcu, w)?;
gen::write_timers(mcu, w)?;
writeln!(w)
}