1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use defmt::*;
use embassy::executor::Spawner;
use embassy::time::{Duration, Timer};
use embassy_nrf::pwm::{
Config, Prescaler, Sequence, SequenceConfig, SequenceMode, SequencePwm, Sequencer,
StartSequence,
};
use embassy_nrf::Peripherals;
use defmt_rtt as _; // global logger
use panic_probe as _;
#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
let seq_words_0: [u16; 5] = [1000, 250, 100, 50, 0];
let seq_words_1: [u16; 4] = [50, 100, 250, 1000];
let mut config = Config::default();
config.prescaler = Prescaler::Div128;
// 1 period is 1000 * (128/16mhz = 0.000008s = 0.008ms) = 8us
// but say we want to hold the value for 5000ms
// so we want to repeat our value as many times as necessary until 5000ms passes
// want 5000/8 = 625 periods total to occur, so 624 (we get the one period for free remember)
let mut seq_config = SequenceConfig::default();
seq_config.refresh = 624;
// thus our sequence takes 5 * 5000ms or 25 seconds
let mut pwm = unwrap!(SequencePwm::new_1ch(p.PWM0, p.P0_13, config));
let sequence_0 = Sequence::new(&seq_words_0, seq_config.clone());
let sequence_1 = Sequence::new(&seq_words_1, seq_config);
let sequencer = Sequencer::new(&mut pwm, sequence_0, Some(sequence_1));
unwrap!(sequencer.start(StartSequence::Zero, SequenceMode::Loop(1)));
// we can abort a sequence if we need to before its complete with pwm.stop()
// or stop is also implicitly called when the pwm peripheral is dropped
// when it goes out of scope
Timer::after(Duration::from_millis(40000)).await;
info!("pwm stopped early!");
}
|
