demo: add ch32v208 demo to ci

examples/ch32v208/.cargo/config.toml

@@ -0,0 +1,6 @@
+[build]
+target = "riscv32imac-unknown-none-elf"
+
+[target."riscv32imac-unknown-none-elf"]
+runner = "wlink -v flash --enable-sdi-print --watch-serial"
+# runner = "wlink -v flash"

examples/ch32v208/Cargo.toml

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+[package]
+name = "ch32v208-examples"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ch32-hal = { path = "../../", features = [
+    "ch32v208wbu6",
+    "defmt",
+    "embassy",
+    "rt",
+], default-features = false }
+embassy-executor = { version = "0.5.0", features = [
+    "nightly",
+    "integrated-timers",
+    "arch-riscv32",
+    "executor-thread",
+] }
+embassy-time = { version = "0.3.0" }
+
+qingke-rt = { version = "0.2.0" }
+qingke = { version = "0.2.0" }
+# qingke-rt = { version = "0.2.0", path = "../../../qingke/qingke-rt" }
+# qingke = { version = "0.2.0", path = "../../../qingke" }
+
+panic-halt = "0.2.0"
+
+[profile.release]
+strip = false   # symbols are not flashed to the microcontroller, so don't strip them.
+lto = true
+opt-level = "z" # Optimize for size.

examples/ch32v208/build.rs

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+fn main() {
+    // println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    // println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}

examples/ch32v208/src/bin/blinky.rs

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+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use hal::gpio::{Level, Output};
+use qingke::riscv;
+use {ch32_hal as hal, panic_halt as _};
+
+#[qingke_rt::entry]
+fn main() -> ! {
+    let p = hal::init(Default::default());
+
+    let mut led = Output::new(p.PB8, Level::Low, Default::default());
+    loop {
+        led.toggle();
+
+        unsafe {
+            riscv::asm::delay(1000000);
+        }
+    }
+}