| // 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(()) |
| }) |
| } |