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
67
68
|
//! This example shows powerful PIO module in the RP235x chip to communicate with WS2812 LED modules.
//! See (https://www.sparkfun.com/categories/tags/ws2812)
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::bind_interrupts;
use embassy_rp::peripherals::PIO0;
use embassy_rp::pio::{InterruptHandler, Pio};
use embassy_rp::pio_programs::ws2812::{PioWs2812, PioWs2812Program};
use embassy_time::{Duration, Ticker};
use smart_leds::RGB8;
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs {
PIO0_IRQ_0 => InterruptHandler<PIO0>;
});
/// Input a value 0 to 255 to get a color value
/// The colours are a transition r - g - b - back to r.
fn wheel(mut wheel_pos: u8) -> RGB8 {
wheel_pos = 255 - wheel_pos;
if wheel_pos < 85 {
return (255 - wheel_pos * 3, 0, wheel_pos * 3).into();
}
if wheel_pos < 170 {
wheel_pos -= 85;
return (0, wheel_pos * 3, 255 - wheel_pos * 3).into();
}
wheel_pos -= 170;
(wheel_pos * 3, 255 - wheel_pos * 3, 0).into()
}
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
info!("Start");
let p = embassy_rp::init(Default::default());
let Pio { mut common, sm0, .. } = Pio::new(p.PIO0, Irqs);
// This is the number of leds in the string. Helpfully, the sparkfun thing plus and adafruit
// feather boards for the 2040 both have one built in.
const NUM_LEDS: usize = 1;
let mut data = [RGB8::default(); NUM_LEDS];
// Common neopixel pins:
// Thing plus: 8
// Adafruit Feather: 16; Adafruit Feather+RFM95: 4
let program = PioWs2812Program::new(&mut common);
let mut ws2812 = PioWs2812::new(&mut common, sm0, p.DMA_CH0, p.PIN_16, &program);
// Loop forever making RGB values and pushing them out to the WS2812.
let mut ticker = Ticker::every(Duration::from_millis(10));
loop {
for j in 0..(256 * 5) {
debug!("New Colors:");
for i in 0..NUM_LEDS {
data[i] = wheel((((i * 256) as u16 / NUM_LEDS as u16 + j as u16) & 255) as u8);
debug!("R: {} G: {} B: {}", data[i].r, data[i].g, data[i].b);
}
ws2812.write(&data).await;
ticker.next().await;
}
}
}
|
