68 lines
2.3 KiB
Rust
68 lines
2.3 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use core::future::pending;
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_nrf::gpio::{Input, Pull};
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use embassy_nrf::gpiote::{InputChannel, InputChannelPolarity};
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use embassy_nrf::ppi::Ppi;
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use embassy_nrf::pwm::{Config, Prescaler, SequenceConfig, SequencePwm, SingleSequenceMode, SingleSequencer};
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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: [u16; 5] = [1000, 250, 100, 50, 0];
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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 250ms 250ms/8 = 31.25 periods
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// so round to 31 - 1 (we get the one period for free remember)
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// thus our sequence takes 5 * 250ms or 1.25 seconds
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let mut seq_config = SequenceConfig::default();
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seq_config.refresh = 30;
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let mut pwm = unwrap!(SequencePwm::new_1ch(p.PWM0, p.P0_13, config));
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// pwm.stop() deconfigures pins, and then the task_start_seq0 task cant work
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// so its going to have to start running in order load the configuration
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let button1 = InputChannel::new(
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p.GPIOTE_CH0,
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Input::new(p.P0_11, Pull::Up),
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InputChannelPolarity::HiToLo,
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);
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let button2 = InputChannel::new(
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p.GPIOTE_CH1,
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Input::new(p.P0_12, Pull::Up),
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InputChannelPolarity::HiToLo,
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);
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// messing with the pwm tasks is ill advised
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// Times::Ininite and Times even are seq0, Times odd is seq1
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let start = unsafe { pwm.task_start_seq0() };
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let stop = unsafe { pwm.task_stop() };
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let sequencer = SingleSequencer::new(&mut pwm, &seq_words, seq_config);
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unwrap!(sequencer.start(SingleSequenceMode::Infinite));
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let mut ppi = Ppi::new_one_to_one(p.PPI_CH1, button1.event_in(), start);
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ppi.enable();
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let mut ppi2 = Ppi::new_one_to_one(p.PPI_CH0, button2.event_in(), stop);
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ppi2.enable();
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info!("PPI setup!");
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info!("Press button 1 to start LED 1");
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info!("Press button 2 to stop LED 1");
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info!("Note! task_stop stops the sequence, but not the pin output");
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// Block forever so the above drivers don't get dropped
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pending::<()>().await;
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}
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