You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pwm_sequence_ws2812b.rs
    path of file: ./repos/embassy/examples/nrf52840/src/bin
    
    the code of the file until where you have to start completion: #![no_std]
#![no_main]

use defmt::*;
use embassy_executor::Spawner;
use embassy_nrf::pwm::{
    Config, Prescaler, SequenceConfig, SequenceLoad, SequencePwm, SingleSequenceMode, SingleSequencer,
};
use embassy_time::Timer;
use {defmt_rtt as _, panic_probe as _};

// WS2812B LED light demonstration. Drives just one light.
// The following ref
    
async fn main(_spawner: Spawner) {
    let p = embassy_nrf::init(Default::default());
    let mut config = Config::default();
    config.sequence_load = SequenceLoad::Common;
    config.prescaler = Prescaler::Div1;
    config.max_duty = 20; // 1.25us (1s / 16Mhz * 20)
    let mut pwm = unwrap!(SequencePwm::new_1ch(p.PWM0, p.P1_05, config));

    // Declare the bits of 24 bits in a buffer we'll be
    // mutating later.
    let mut 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
        RES,
    ];
    let mut seq_config = SequenceConfig::default();
    seq_config.end_delay = 799; // 50us (20 ticks * 40) - 1 tick because we've already got one RES;

    let mut color_bit = 16;
    let mut bit_value = T0H;

    loop {
        let sequences = SingleSequencer::new(&mut pwm, &seq_words, seq_config.clone());
        unwrap!(sequences.start(SingleSequenceMode::Times(1)));

        Timer::after_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;
            }
        }

        drop(sequences);

        seq_words[color_bit] = bit_value;
    }
}