max/embassy
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Now permits sequences to be mutated subsequently

Browse Source
This commit is contained in:
huntc
2022-01-28 16:21:53 +11:00
parent 8e9f448866
commit 9ac52a768b
4 changed files with 58 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
examples/nrf/src/bin/pwm_sequence_ws2812b.rs
View File

@ -15,7 +15,9 @@ use embassy_nrf::Peripherals;
// WS2812B LED light demonstration. Drives just one light.
// The following reference on WS2812B may be of use:
// https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf
// https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf.
// This demo lights up a single LED in blue. It then proceeds
// to pulsate the LED rapidly.
// In the following declarations, setting the high bit tells the PWM
// to reverse polarity, which is what the WS2812B expects.
@ -29,17 +31,17 @@ const RES: u16 = 0x8000;
#[embassy::main]
async fn main(_spawner: Spawner, p: Peripherals) {
// Declare the bits of 24 bits
let blue_seq_words = [
let mut color_seq_words = [
T0H, T0H, T0H, T0H, T0H, T0H, T0H, T0H, // G
T0H, T0H, T0H, T0H, T0H, T0H, T0H, T0H, // R
T1H, T1H, T1H, T1H, T1H, T1H, T1H, T1H, // B
];
let blue_seq = Sequence::new(&blue_seq_words, SequenceConfig::default());
let color_seq = Sequence::new(&mut color_seq_words, SequenceConfig::default());
let reset_seq_words = [RES; 1];
let mut reset_seq_words = [RES; 1];
let mut reset_seq_config = SequenceConfig::default();
reset_seq_config.end_delay = 799; // 50us (20 ticks * 40) - 1 tick because we've already got one RES;
let reset_seq = Sequence::new(&reset_seq_words, reset_seq_config);
let reset_seq = Sequence::new(&mut reset_seq_words, reset_seq_config);
let mut config = Config::default();
config.sequence_load = SequenceLoad::Common;
@ -49,8 +51,33 @@ async fn main(_spawner: Spawner, p: Peripherals) {
p.PWM0, p.P1_05, NoPin, NoPin, NoPin, config,
));
unwrap!(pwm.start(blue_seq, Some(reset_seq), SequenceMode::Times(2)));
unwrap!(pwm.start(color_seq, Some(reset_seq), SequenceMode::Times(2)));
Timer::after(Duration::from_millis(20000)).await;
info!("Program stopped");
Timer::after(Duration::from_millis(1000)).await;
let mut color_bit = 16;
let mut bit_value = T0H;
loop {
if let (Some(color_seq), Some(reset_seq)) = pwm.stop() {
color_seq.words[color_bit] = bit_value;
unwrap!(pwm.start(color_seq, Some(reset_seq), SequenceMode::Times(2)));
}
Timer::after(Duration::from_millis(50)).await;
if bit_value == T0H {
if color_bit == 20 {
bit_value = T1H;
} else {
color_bit += 1;
}
} else {
if color_bit == 16 {
bit_value = T0H;
} else {
color_bit -= 1;
}
}
}
}