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// Copyright (c) 2018 The rust-gpio-cdev Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use gpio_cdev::{Chip, LineRequestFlags};
use quicli::prelude::*;
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
struct Cli {
/// The gpiochip device (e.g. /dev/gpiochip0)
chip: String,
/// The offset of the GPIO line for the provided chip
line: u32,
/// The value to write
value: u8,
}
fn do_main(args: Cli) -> std::result::Result<(), gpio_cdev::Error> {
let mut chip = Chip::new(args.chip)?;
// NOTE: we set the default value to the desired state so
// setting it separately is not required. The LineHandle
// instance that is returned by request must be owned by a
// variable for the duration of the time that the line will
// be used. If the instance is not assigned to a variable,
// then the LineHandle will be immediately dropped after
// request returns and the pin will appear to do nothing.
let _handle =
chip.get_line(args.line)?
.request(LineRequestFlags::OUTPUT, args.value, "driveoutput")?;
println!("Output being driven... Enter to exit");
let mut buf = String::new();
::std::io::stdin().read_line(&mut buf)?;
Ok(())
}
fn main() -> CliResult {
let args = Cli::from_args();
do_main(args).or_else(|e| {
error!("{:?}", e);
Ok(())
})
}
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