diff --git a/examples/ch32v003/Cargo.toml b/examples/ch32v003/Cargo.toml
index 13db783..2d00c39 100644
--- a/examples/ch32v003/Cargo.toml
+++ b/examples/ch32v003/Cargo.toml
@@ -19,7 +19,7 @@ embassy-executor = { version = "0.5.0", features = [
 ] }
 embassy-time = { version = "0.3.0" }
 
-qingke-rt = "0.2.1"
+qingke-rt = { version = "0.2.1", features = ["highcode"] }
 qingke = "0.2.0"
 # qingke-rt = { version = "0.2.0", path = "../../../qingke/qingke-rt" }
 # qingke = { version = "0.2.0", path = "../../../qingke" }
diff --git a/examples/ch32v003/src/bin/gpio_ws2812.rs b/examples/ch32v003/src/bin/gpio_ws2812.rs
new file mode 100644
index 0000000..00790c4
--- /dev/null
+++ b/examples/ch32v003/src/bin/gpio_ws2812.rs
@@ -0,0 +1,184 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use ch32_hal as hal;
+use ch32_hal::gpio::Output;
+use ch32_hal::timer::simple_pwm::SimplePwm;
+use hal::delay::Delay;
+use hal::println;
+use hal::time::Hertz;
+use hal::timer::complementary_pwm::{ComplementaryPwm, ComplementaryPwmPin};
+use hal::timer::low_level::CountingMode;
+use hal::timer::simple_pwm::PwmPin;
+use qingke_rt::highcode;
+
+pub const RGB_UNIT_MAX: f32 = 255.0;
+pub const HUE_MAX: f32 = 360.0;
+pub const PERCENT_MAX: f32 = 100.0;
+pub const RATIO_MAX: f32 = 1.0;
+pub const ALL_MIN: f32 = 0.0;
+
+const ONE: f32 = 1.0;
+const TWO: f32 = 2.0;
+const SIX: f32 = 6.0;
+
+const ONE_THIRD: f32 = ONE / 3.0;
+const TWO_THIRD: f32 = TWO / 3.0;
+
+pub fn bound(r: f32, entire: f32) -> f32 {
+    let mut n = r;
+    loop {
+        let less = n < ALL_MIN;
+        let bigger = n > entire;
+        if !less && !bigger {
+            break n;
+        }
+        if less {
+            n += entire;
+        } else {
+            n -= entire;
+        }
+    }
+}
+
+pub fn bound_ratio(r: f32) -> f32 {
+    bound(r, RATIO_MAX)
+}
+
+fn calc_rgb_unit(unit: f32, temp1: f32, temp2: f32) -> f32 {
+    let mut result = temp2;
+    if SIX * unit < ONE {
+        result = temp2 + (temp1 - temp2) * SIX * unit
+    } else if TWO * unit < ONE {
+        result = temp1
+    } else if 3.0 * unit < TWO {
+        result = temp2 + (temp1 - temp2) * (TWO_THIRD - unit) * SIX
+    }
+    result * RGB_UNIT_MAX
+}
+
+/// hsl: [1.0, 1.0, 1.0] -> [255.0, 255.0, 255.0]
+pub fn hsl_to_rgb(hsl: [f32; 3]) -> [f32; 3] {
+    let [h, s, l]: [f32; 3] = hsl;
+    if s == 0.0 {
+        let unit = RGB_UNIT_MAX * l;
+        return [unit, unit, unit];
+    }
+
+    let temp1 = if l < 0.5 { l * (ONE + s) } else { l + s - l * s };
+
+    let temp2 = TWO * l - temp1;
+    let hue = h;
+
+    let temp_r = bound_ratio(hue + ONE_THIRD);
+    let temp_g = bound_ratio(hue);
+    let temp_b = bound_ratio(hue - ONE_THIRD);
+
+    let r = calc_rgb_unit(temp_r, temp1, temp2);
+    let g = calc_rgb_unit(temp_g, temp1, temp2);
+    let b = calc_rgb_unit(temp_b, temp1, temp2);
+    [r, g, b]
+}
+
+struct WS2812 {
+    pin: Output<'static>,
+}
+
+impl WS2812 {
+    pub fn new(pin: Output<'static>) -> Self {
+        Self { pin }
+    }
+
+    pub fn reset(&mut self) {
+        self.pin.set_low();
+        Delay.delay_us(50);
+    }
+
+    // tune values to get 800kHz
+    // duty cycle 33% and 66%
+    #[highcode]
+    pub fn test(&mut self) {
+        loop {
+            self.pin.set_high();
+            qingke::riscv::asm::delay(18);
+            self.pin.set_low();
+            qingke::riscv::asm::delay(7);
+        }
+    }
+
+    #[highcode]
+    pub fn set_color(&mut self, mut color: u32) {
+        for i in (0..24).rev() {
+            if color & (1 << i) == 0 {
+                self.pin.set_high();
+                qingke::riscv::asm::delay(8);
+                self.pin.set_low();
+                qingke::riscv::asm::delay(16);
+            } else {
+                self.pin.set_high();
+                qingke::riscv::asm::delay(18);
+                self.pin.set_low();
+                qingke::riscv::asm::delay(7);
+            }
+        }
+
+        self.pin.set_low();
+        qingke::riscv::asm::delay(8 * 50);
+    }
+}
+
+#[qingke_rt::entry]
+fn main() -> ! {
+    hal::debug::SDIPrint::enable();
+    let mut config = hal::Config::default();
+
+    config.rcc = hal::rcc::Config::SYSCLK_FREQ_48MHZ_HSI;
+    let p = hal::init(config);
+
+    let ws2812 = Output::new(p.PA2, hal::gpio::Level::Low, Default::default());
+
+    let mut ws2812 = WS2812::new(ws2812);
+
+    let mut i = 0;
+
+    //  loop {
+    //      ws2812.test();
+    //  }
+
+    loop {
+        for h in 0..360 {
+            // hsl_to_rgb([h as f32 / 360.0, 0.900, 0.500])
+            let rgb = hsl_to_rgb([h as f32 / 360.0, 0.900, 0.500]);
+            // to GRB
+            let color = ((rgb[1] as u32) << 16) | ((rgb[0] as u32) << 8) | (rgb[2] as u32);
+
+
+            ws2812.set_color(color);
+
+            Delay.delay_ms(20);
+        }
+    }
+
+    loop {
+        ws2812.set_color(0x000000);
+        //        ws2812.pin.set_low();
+        // ws2812.reset();
+
+        // Shift random
+
+        if i > 0xffffff {
+            i = 0;
+        }
+
+        println!("toggle! {:06x}", i);
+        Delay.delay_ms(10);
+    }
+}
+
+#[panic_handler]
+fn panic(info: &core::panic::PanicInfo) -> ! {
+    let _ = hal::println!("\n\n\n{}", info);
+
+    loop {}
+}