61 lines
2 KiB
Rust
61 lines
2 KiB
Rust
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#![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::{
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Config, Prescaler, SequenceConfig, SequenceLoad, SequenceMode, SequencePwm,
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};
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use embassy_nrf::Peripherals;
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// WS2812B LED light demonstration. Drives just one light.
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// The following reference on WS2812B may be of use:
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// https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf
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// In the following declarations, setting the high bit tells the PWM
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// to reverse polarity, which is what the WS2812B expects.
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const T1H: u16 = 0x8000 | 13; // Duty = 13/20 ticks (0.8us/1.25us) for a 1
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const T0H: u16 = 0x8000 | 7; // Duty 7/20 ticks (0.4us/1.25us) for a 0
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const RES: u16 = 0x8000;
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// Provides data to a WS2812b (Neopixel) LED and makes it go blue. The data
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// line is assumed to be P1_05.
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#[embassy::main]
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async fn main(_spawner: Spawner, p: Peripherals) {
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// Declare the bits of 24 bits
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let mut blue_seq: [u16; 8 * 3] = [
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T0H, T0H, T0H, T0H, T0H, T0H, T0H, T0H, // G
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T0H, T0H, T0H, T0H, T0H, T0H, T0H, T0H, // R
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T1H, T1H, T1H, T1H, T1H, T1H, T1H, T1H, // B
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];
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let reset_seq = [RES; 1];
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let mut config = Config::default();
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config.sequence_load = SequenceLoad::Common;
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config.prescaler = Prescaler::Div1;
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config.max_duty = 20; // 1.25us (1s / 16Mhz * 20)
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let mut pwm = unwrap!(SequencePwm::new(
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p.PWM0, p.P1_05, NoPin, NoPin, NoPin, config,
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));
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let blue_seq_config = SequenceConfig::default();
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let mut reset_seq_config = SequenceConfig::default();
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reset_seq_config.end_delay = 799; // 50us (20 ticks * 40) - 1 tick because we've already got one RES
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unwrap!(pwm.start(
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&blue_seq,
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blue_seq_config,
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Some(&reset_seq),
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Some(reset_seq_config),
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SequenceMode::Times(2)
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));
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Timer::after(Duration::from_millis(20000)).await;
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info!("Program stopped");
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}
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