pounder_test/src/hardware/afe.rs

85 lines
2.0 KiB
Rust

use miniconf::Miniconf;
use serde::{Deserialize, Serialize};
use core::convert::TryFrom;
use num_enum::TryFromPrimitive;
#[derive(
Copy, Clone, Debug, Serialize, Deserialize, TryFromPrimitive, Miniconf,
)]
#[repr(u8)]
pub enum Gain {
G1 = 0b00,
G2 = 0b01,
G5 = 0b10,
G10 = 0b11,
}
/// A programmable gain amplifier that allows for setting the gain via GPIO.
pub struct ProgrammableGainAmplifier<A0, A1> {
a0: A0,
a1: A1,
}
impl Gain {
/// Get the AFE gain as a numerical value.
pub fn as_multiplier(self) -> f32 {
match self {
Gain::G1 => 1.0,
Gain::G2 => 2.0,
Gain::G5 => 5.0,
Gain::G10 => 10.0,
}
}
}
impl<A0, A1> ProgrammableGainAmplifier<A0, A1>
where
A0: embedded_hal::digital::v2::StatefulOutputPin,
A0::Error: core::fmt::Debug,
A1: embedded_hal::digital::v2::StatefulOutputPin,
A1::Error: core::fmt::Debug,
{
/// Construct a new programmable gain driver.
///
/// Args:
/// * `a0` - An output connected to the A0 input of the amplifier.
/// * `a1` - An output connected to the A1 input of the amplifier.
pub fn new(a0: A0, a1: A1) -> Self {
let mut afe = Self { a0, a1 };
afe.set_gain(Gain::G1);
afe
}
/// Set the gain of the front-end.
pub fn set_gain(&mut self, gain: Gain) {
if (gain as u8 & 0b01) != 0 {
self.a0.set_high().unwrap();
} else {
self.a0.set_low().unwrap();
}
if (gain as u8 & 0b10) != 0 {
self.a1.set_high().unwrap()
} else {
self.a1.set_low().unwrap();
}
}
/// Get the programmed gain of the analog front-end.
pub fn get_gain(&self) -> Gain {
let mut code: u8 = 0;
if self.a0.is_set_high().unwrap() {
code |= 0b1;
}
if self.a1.is_set_high().unwrap() {
code |= 0b10;
}
// NOTE(unwrap): All possibilities covered.
Gain::try_from(code).unwrap()
}
}