c9f29534d6
I had introduced a small bug in my last PR where I assigned the sequence before stopping the PWM. I now stop the PWM before doing that now. Also, corrected a math comment.
46 lines
1.6 KiB
Rust
46 lines
1.6 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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#[path = "../example_common.rs"]
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mod example_common;
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use defmt::*;
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use embassy::executor::Spawner;
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use embassy::time::{Duration, Timer};
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use embassy_nrf::gpio::NoPin;
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use embassy_nrf::pwm::{Prescaler, SequenceConfig, SequenceMode, SequencePwm};
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use embassy_nrf::Peripherals;
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#[embassy::main]
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async fn main(_spawner: Spawner, p: Peripherals) {
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let seq_values_1: [u16; 5] = [1000, 250, 100, 50, 0];
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let seq_values_2: [u16; 5] = [0, 50, 100, 250, 1000];
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let mut config = SequenceConfig::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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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(
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p.PWM0, p.P0_13, NoPin, NoPin, NoPin, config,
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));
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let _ = pwm.start(&seq_values_1, SequenceMode::Infinite);
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info!("pwm started!");
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Timer::after(Duration::from_millis(20000)).await;
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info!("pwm starting with another sequence!");
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let _ = pwm.start(&seq_values_2, SequenceMode::Infinite);
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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(20000)).await;
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info!("pwm stopped early!");
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}
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