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dual-iir: add some mqtt parameter docs #346

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bors merged 1 commit into from
Apr 28, 2021
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dual-iir: add some mqtt parameter docs #346

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9 changes: 8 additions & 1 deletion src/bin/dual-iir.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,9 +31,17 @@ pub struct Settings {
impl Default for Settings {
fn default() -> Self {
Self {
// Analog frontend programmable gain amplifier gains (G1, G2, G5, G10)
afe: [AfeGain::G1, AfeGain::G1],
// IIR filter tap gains are an array `[b0, b1, b2, a1, a2]` such that the
// new output is computed as `y0 = a1*y1 + a2*y2 + b0*x0 + b1*x1 + b2*x2`.
// The array is `iir_state[channel-index][cascade-index][coeff-index]`.
// The IIR coefficients can be mapped to other transfer function
// representations, for example as described in https://arxiv.org/abs/1508.06319
iir_ch: [[iir::IIR::new(1., -SCALE, SCALE); IIR_CASCADE_LENGTH]; 2],
// Permit the DI1 digital input to suppress filter output updates.
allow_hold: false,
// Force suppress filter output updates.
force_hold: false,
}
}
Expand All @@ -48,7 +56,6 @@ const APP: () = {
dacs: (Dac0Output, Dac1Output),
mqtt_config: MiniconfInterface<Settings>,

// Format: iir_state[ch][cascade-no][coeff]
#[init([[[0.; 5]; IIR_CASCADE_LENGTH]; 2])]
iir_state: [[iir::Vec5; IIR_CASCADE_LENGTH]; 2],
settings: Settings,
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