82 lines
1.9 KiB
Rust
82 lines
1.9 KiB
Rust
use serde::{Deserialize, Serialize};
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use core::convert::TryFrom;
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use enum_iterator::IntoEnumIterator;
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#[derive(Copy, Clone, Debug, Serialize, Deserialize, IntoEnumIterator)]
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pub enum Gain {
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G1 = 0b00,
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G2 = 0b01,
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G5 = 0b10,
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G10 = 0b11,
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}
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/// A programmable gain amplifier that allows for setting the gain via GPIO.
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pub struct ProgrammableGainAmplifier<A0, A1> {
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a0: A0,
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a1: A1,
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}
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impl TryFrom<u8> for Gain {
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type Error = ();
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fn try_from(value: u8) -> Result<Self, Self::Error> {
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for gain in Gain::into_enum_iter() {
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if value == gain as u8 {
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return Ok(gain);
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}
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}
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Err(())
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}
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}
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impl<A0, A1> ProgrammableGainAmplifier<A0, A1>
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where
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A0: embedded_hal::digital::v2::StatefulOutputPin,
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A0::Error: core::fmt::Debug,
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A1: embedded_hal::digital::v2::StatefulOutputPin,
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A1::Error: core::fmt::Debug,
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{
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/// Construct a new programmable gain driver.
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///
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/// Args:
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/// * `a0` - An output connected to the A0 input of the amplifier.
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/// * `a1` - An output connected to the A1 input of the amplifier.
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pub fn new(a0: A0, a1: A1) -> Self {
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let mut afe = Self { a0, a1 };
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afe.set_gain(Gain::G1);
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afe
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}
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/// Set the gain of the front-end.
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pub fn set_gain(&mut self, gain: Gain) {
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if (gain as u8 & 0b01) != 0 {
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self.a0.set_high().unwrap();
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} else {
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self.a0.set_low().unwrap();
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}
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if (gain as u8 & 0b10) != 0 {
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self.a1.set_high().unwrap()
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} else {
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self.a1.set_low().unwrap();
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}
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}
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/// Get the programmed gain of the analog front-end.
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pub fn get_gain(&self) -> Result<Gain, ()> {
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let mut code: u8 = 0;
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if self.a0.is_set_high().unwrap() {
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code |= 0b1;
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}
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if self.a1.is_set_high().unwrap() {
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code |= 0b10;
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}
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Gain::try_from(code)
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}
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}
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