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Optimization to be able to work with only 2 buffers

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This commit is contained in:
Christian Perez Llamas
2022-11-29 01:09:47 +01:00
parent 6b8ab32536
commit 199504be56
2 changed files with 43 additions and 25 deletions
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20
examples/nrf/src/bin/i2s_waveform.rs
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@ -12,7 +12,8 @@ use {defmt_rtt as _, panic_probe as _};
type Sample = i16;
const NUM_SAMPLES: usize = 6000;
const NUM_BUFFERS: usize = 2;
const NUM_SAMPLES: usize = 50;
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
@ -30,31 +31,27 @@ async fn main(_spawner: Spawner) {
let irq = interrupt::take!(I2S);
let mut output_stream = I2S::master(p.I2S, irq, p.P0_25, p.P0_26, p.P0_27, master_clock, config).output(p.P0_28);
let mut buffers: [i2s::AlignedBuffer<Sample, NUM_SAMPLES>; 3] = [
i2s::AlignedBuffer::default(),
i2s::AlignedBuffer::default(),
i2s::AlignedBuffer::default(),
];
let mut buffers: [i2s::AlignedBuffer<Sample, NUM_SAMPLES>; NUM_BUFFERS] =
[i2s::AlignedBuffer::default(); NUM_BUFFERS];
let mut waveform = Waveform::new(1.0 / sample_rate as f32);
waveform.process(&mut buffers[0]);
waveform.process(&mut buffers[1]);
output_stream.start(&buffers[0]).await.expect("I2S Start");
let mut index = 1;
loop {
waveform.process(&mut buffers[index]);
if let Err(err) = output_stream.send_from_ram(&buffers[index]).await {
error!("{}", err);
}
index += 1;
if index >= 3 {
if index >= NUM_BUFFERS {
index = 0;
}
waveform.process(&mut buffers[index]);
}
}
@ -67,7 +64,8 @@ struct Waveform {
impl Waveform {
fn new(inv_sample_rate: f32) -> Self {
let carrier = SineOsc::new();
let mut carrier = SineOsc::new();
carrier.set_frequency(110.0, inv_sample_rate);
let mut freq_mod = SineOsc::new();
freq_mod.set_frequency(8.0, inv_sample_rate);