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PWM WS2812B example and per sequence config

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Demonstrates how to set the colour of a WS2812B to blue using PWM, and the use of multiple sequences along with their own config. This required an API change.
This commit is contained in:
huntc
2022-01-25 18:06:42 +11:00
parent d76cd5ceaf
commit 47aeab152f
4 changed files with 144 additions and 35 deletions
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9
examples/nrf/src/bin/pwm_sequence_ppi.rs
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@@ -11,26 +11,27 @@ use embassy::executor::Spawner;
use embassy_nrf::gpio::{Input, NoPin, Pull};
use embassy_nrf::gpiote::{InputChannel, InputChannelPolarity};
use embassy_nrf::ppi::Ppi;
use embassy_nrf::pwm::{Prescaler, SequenceConfig, SequenceMode, SequencePwm};
use embassy_nrf::pwm::{Config, Prescaler, SequenceConfig, SequenceMode, SequencePwm};
use embassy_nrf::Peripherals;
#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
let seq_values: [u16; 5] = [1000, 250, 100, 50, 0];
let mut config = SequenceConfig::default();
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
config.refresh = 30;
let mut seq_config = SequenceConfig::default();
seq_config.refresh = 30;
let mut pwm = unwrap!(SequencePwm::new(
p.PWM0, p.P0_13, NoPin, NoPin, NoPin, config,
));
let _ = pwm.start(&seq_values, SequenceMode::Times(1));
let _ = pwm.start(&seq_values, seq_config, None, None, SequenceMode::Infinite);
// 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