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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
#![no_std]
#![no_main]
use core::future::pending;
use defmt::*;
use embassy_executor::Spawner;
use embassy_nrf::gpio::{Input, Pull};
use embassy_nrf::gpiote::{InputChannel, InputChannelPolarity};
use embassy_nrf::ppi::Ppi;
use embassy_nrf::pwm::{Config, Prescaler, SequenceConfig, SequencePwm, SingleSequenceMode, SingleSequencer};
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_nrf::init(Default::default());
let seq_words: [u16; 5] = [1000, 250, 100, 50, 0];
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 250ms 250ms/8 = 31.25 periods
// so round to 31 - 1 (we get the one period for free remember)
// thus our sequence takes 5 * 250ms or 1.25 seconds
let mut seq_config = SequenceConfig::default();
seq_config.refresh = 30;
let mut pwm = unwrap!(SequencePwm::new_1ch(p.PWM0, p.P0_13, config));
// pwm.stop() deconfigures pins, and then the task_start_seq0 task cant work
// so its going to have to start running in order load the configuration
let button1 = InputChannel::new(
p.GPIOTE_CH0,
Input::new(p.P0_11, Pull::Up),
InputChannelPolarity::HiToLo,
);
let button2 = InputChannel::new(
p.GPIOTE_CH1,
Input::new(p.P0_12, Pull::Up),
InputChannelPolarity::HiToLo,
);
// messing with the pwm tasks is ill advised
// Times::Ininite and Times even are seq0, Times odd is seq1
let start = unsafe { pwm.task_start_seq0() };
let stop = unsafe { pwm.task_stop() };
let sequencer = SingleSequencer::new(&mut pwm, &seq_words, seq_config);
unwrap!(sequencer.start(SingleSequenceMode::Infinite));
let mut ppi = Ppi::new_one_to_one(p.PPI_CH1, button1.event_in(), start);
ppi.enable();
let mut ppi2 = Ppi::new_one_to_one(p.PPI_CH0, button2.event_in(), stop);
ppi2.enable();
info!("PPI setup!");
info!("Press button 1 to start LED 1");
info!("Press button 2 to stop LED 1");
info!("Note! task_stop stops the sequence, but not the pin output");
// Block forever so the above drivers don't get dropped
pending::<()>().await;
}
|
