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dac.rs
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dac.rs
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//! Provides a DAC interface for userspace.
//!
//! Usage
//! -----
//!
//! ```rust
//! let dac = static_init!(
//! capsules::dac::Dac<'static>,
//! capsules::dac::Dac::new(&mut sam4l::dac::DAC));
//! ```
/// Syscall driver number.
pub const DRIVER_NUM: usize = 0x00000006;
use kernel::hil;
use kernel::{AppId, Driver, ReturnCode};
pub struct Dac<'a> {
dac: &'a hil::dac::DacChannel,
}
impl Dac<'a> {
pub fn new(dac: &'a hil::dac::DacChannel) -> Dac<'a> {
Dac { dac: dac }
}
}
impl Driver for Dac<'a> {
/// Control the DAC.
///
/// ### `command_num`
///
/// - `0`: Driver check.
/// - `1`: Initialize and enable the DAC.
/// - `2`: Set the output to `data1`, a scaled output value.
fn command(&self, command_num: usize, data: usize, _: usize, _: AppId) -> ReturnCode {
match command_num {
0 /* check if present */ => return ReturnCode::SUCCESS,
// enable the dac
1 => self.dac.initialize(),
// set the dac output
2 => self.dac.set_value(data),
_ => return ReturnCode::ENOSUPPORT,
}
}
}