demo: add pwm demo for ch32v103

examples/ch32v103/src/bin/pwm.rs

@@ -0,0 +1,44 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use hal::delay::Delay;
+use hal::println;
+use hal::time::Hertz;
+use hal::timer::low_level::CountingMode;
+use hal::timer::simple_pwm::{PwmPin, SimplePwm};
+use {ch32_hal as hal, panic_halt as _};
+
+#[qingke_rt::entry]
+fn main() -> ! {
+    hal::debug::SDIPrint::enable();
+    let p = hal::init(Default::default());
+
+    let ch1 = PwmPin::new_ch1::<0>(p.PA8);
+    let mut pwm = SimplePwm::new(
+        p.TIM1,
+        Some(ch1),
+        None,
+        None,
+        None,
+        Hertz::khz(1),
+        CountingMode::default(),
+    );
+    let ch = hal::timer::Channel::Ch1;
+
+    let max_duty = pwm.get_max_duty();
+    println!("max duty: {}", max_duty);
+    pwm.set_duty(ch, 2000);
+    pwm.enable(ch);
+
+    loop {
+        for i in 0..100 {
+            pwm.set_duty(ch, i * 80);
+            Delay.delay_ms(1_0);
+        }
+        for i in (0..100).rev() {
+            pwm.set_duty(ch, i * 80);
+            Delay.delay_ms(1_0);
+        }
+    }
+}