max/embassy
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Discard the first N samples due to transients

Browse Source
This commit is contained in:
Quentin Smith
2022-08-21 01:44:04 -04:00
parent 0963b5f92c
commit 3d26573c6b
2 changed files with 24 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
examples/nrf/src/bin/pdm.rs
View File

@ -26,14 +26,16 @@ async fn main(_p: Spawner) {
info!("Gain = {} dB", defmt::Debug2Format(&gain));
for _ in 0..10 {
let mut buf = [0; 1500];
pdm.sample(&mut buf).await;
pdm.sample(5, &mut buf).await;
let mean = (buf.iter().map(|v| i32::from(*v)).sum::<i32>() / buf.len() as i32) as i16;
info!(
"{} samples, min {=i16}, max {=i16}, RMS {=i16}",
"{} samples, min {=i16}, max {=i16}, mean {=i16}, AC RMS {=i16}",
buf.len(),
buf.iter().min().unwrap(),
buf.iter().max().unwrap(),
mean,
(
buf.iter().map(|v| i32::from(*v).pow(2)).fold(0i32, |a,b| a.saturating_add(b))
buf.iter().map(|v| i32::from(*v - mean).pow(2)).fold(0i32, |a,b| a.saturating_add(b))
/ buf.len() as i32).sqrt() as i16,
);
info!("samples = {}", &buf);