35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::info;
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use embassy_executor::Spawner;
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use embassy_nrf::interrupt;
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use embassy_nrf::pdm::{Config, Channels, Pdm};
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use embassy_time::{Duration, Timer};
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use fixed::types::I7F1;
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::main]
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async fn main(_p: Spawner) {
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let mut p = embassy_nrf::init(Default::default());
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let mut config = Config::default();
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// Pins are correct for the onboard microphone on the Feather nRF52840 Sense.
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config.channels = Channels::Mono;
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config.gain_left = I7F1::from_bits(5); // 2.5 dB
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let mut pdm = Pdm::new(p.PDM, interrupt::take!(PDM), &mut p.P0_00, &mut p.P0_01, config);
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loop {
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let mut buf = [0; 128];
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pdm.sample(&mut buf).await;
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info!(
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"{} samples, min {=i16}, max {=i16}, mean {=i16}",
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buf.len(),
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buf.iter().min().unwrap(),
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buf.iter().max().unwrap(),
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(buf.iter().map(|v| i32::from(*v)).sum::<i32>() / buf.len() as i32) as i16,
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);
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Timer::after(Duration::from_millis(100)).await;
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}
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}
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