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Investigating discontinuities in the signal

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This commit is contained in:
Christian Perez Llamas
2022-11-13 01:41:32 +01:00
parent 122a31d208
commit d2e8794f29
2 changed files with 66 additions and 29 deletions
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27
examples/nrf/src/bin/i2s.rs
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@ -9,6 +9,7 @@ use core::f32::consts::PI;
use defmt::{error, info};
use embassy_executor::Spawner;
use embassy_nrf::i2s::{MckFreq, Mode, Ratio, MODE_MASTER_16000, MODE_MASTER_8000};
use embassy_nrf::pac::ficr::info;
use embassy_nrf::{i2s, interrupt};
use {defmt_rtt as _, panic_probe as _};
@ -49,16 +50,14 @@ async fn main(_spawner: Spawner) {
let mut buf = AlignedBuffer([0i16; BUF_SIZE]);
let mut carrier = SineOsc::new();
carrier.set_frequency(300.0, inv_sample_rate);
carrier.set_frequency(240.0, inv_sample_rate);
let mut modulator = SineOsc::new();
modulator.set_frequency(0.01, inv_sample_rate);
modulator.set_amplitude(0.2);
// let mut modulator = SineOsc::new();
// modulator.set_frequency(0.01, inv_sample_rate);
// modulator.set_amplitude(0.2);
i2s.set_tx_enabled(true);
i2s.start();
loop {
let mut lastf = 0.0;
let mut generate = |buf: &mut [i16]| {
for sample in buf.as_mut().chunks_mut(2) {
let signal = carrier.generate();
// let modulation = bipolar_to_unipolar(modulator.generate());
@ -67,8 +66,18 @@ async fn main(_spawner: Spawner) {
let value = (i16::MAX as f32 * signal) as i16;
sample[0] = value;
sample[1] = value;
// info!("{}", signal);
}
};
generate(buf.as_mut().as_mut_slice());
i2s.set_tx_enabled(true);
i2s.start();
loop {
// info!("--");
generate(buf.as_mut().as_mut_slice());
if let Err(err) = i2s.tx(buf.as_ref().as_slice()).await {
error!("{}", err);