demo: add pwm demo for ch32v307

examples/ch32v307/.cargo/config.toml

@@ -1,7 +1,7 @@
 [build]
-target = "riscv32imac-unknown-none-elf"
+target = "riscv32imafc-unknown-none-elf"
 
-[target.riscv32imac-unknown-none-elf]
+[target.riscv32imafc-unknown-none-elf]
 runner = "wlink flash --enable-sdi-print --watch-serial"
 # runner = "wlink -v flash --no-erase --dry-run"
 # runner = "probe-rs run --chip CH32V307"

examples/ch32v307/README.md

@@ -3,3 +3,21 @@
 ## Boards
 
 ### YD-CH32V307VCT6
+
+8MHz XTAL, 32.768KHz XTAL
+
+- PA15, Red LED, active high
+- PB4, Blue LED, active high
+- PB3, User button, active low
+
+FT24C32, with pull up
+
+- SCL: PB10
+- SDA: PB11
+
+W26Q16
+
+- CS: PA2
+- DO(IO1): PA6
+- CLK: PA5
+- DI(IO0): PA7

examples/ch32v307/src/bin/blinky_pwm.rs

@@ -0,0 +1,49 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy_executor::Spawner;
+use embassy_time::Timer;
+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 _};
+
+#[embassy_executor::main(entry = "qingke_rt::entry")]
+async fn main(_spawner: Spawner) -> ! {
+    hal::debug::SDIPrint::enable();
+    let mut config = hal::Config::default();
+    config.rcc = hal::rcc::Config::SYSCLK_FREQ_144MHZ_HSE;
+    let p = hal::init(Default::default());
+    hal::embassy::init();
+
+    // use remap 1, or 3
+    let pin = PwmPin::new_ch1::<1>(p.PA15);
+    let mut pwm = SimplePwm::new(
+        p.TIM2,
+        Some(pin),
+        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, 7000);
+    pwm.enable(ch);
+
+    loop {
+        for i in 0..100 {
+            pwm.set_duty(ch, i * 80);
+            Timer::after_millis(5).await;
+        }
+        for i in (0..100).rev() {
+            pwm.set_duty(ch, i * 80);
+            Timer::after_millis(5).await;
+        }
+    }
+}