42 lines
1.7 KiB
Rust
42 lines
1.7 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::*;
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use embassy_executor::Spawner;
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use embassy_nrf::pwm::{
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Config, Prescaler, Sequence, SequenceConfig, SequenceMode, SequencePwm, Sequencer, StartSequence,
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};
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use embassy_time::{Duration, Timer};
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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(_spawner: Spawner) {
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let p = embassy_nrf::init(Default::default());
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let seq_words_0: [u16; 5] = [1000, 250, 100, 50, 0];
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let seq_words_1: [u16; 4] = [50, 100, 250, 1000];
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let mut config = Config::default();
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config.prescaler = Prescaler::Div128;
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// 1 period is 1000 * (128/16mhz = 0.000008s = 0.008ms) = 8us
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// but say we want to hold the value for 5000ms
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// so we want to repeat our value as many times as necessary until 5000ms passes
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// want 5000/8 = 625 periods total to occur, so 624 (we get the one period for free remember)
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let mut seq_config = SequenceConfig::default();
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seq_config.refresh = 624;
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// thus our sequence takes 5 * 5000ms or 25 seconds
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let mut pwm = unwrap!(SequencePwm::new_1ch(p.PWM0, p.P0_13, config));
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let sequence_0 = Sequence::new(&seq_words_0, seq_config.clone());
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let sequence_1 = Sequence::new(&seq_words_1, seq_config);
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let sequencer = Sequencer::new(&mut pwm, sequence_0, Some(sequence_1));
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unwrap!(sequencer.start(StartSequence::Zero, SequenceMode::Loop(1)));
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// we can abort a sequence if we need to before its complete with pwm.stop()
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// or stop is also implicitly called when the pwm peripheral is dropped
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// when it goes out of scope
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Timer::after(Duration::from_millis(40000)).await;
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info!("pwm stopped early!");
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}
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