start adding embassy example

examples/embassy/Cargo.toml

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+[package]
+name = "embassy"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+cortex-m = { version = "0.7", features = ["critical-section-single-core"] }
+cortex-m-rt = "0.7"
+embedded-hal = "1"
+rtt-target = { version = "0.5" }
+panic-rtt-target = { version = "0.1" }
+
+embassy-sync = { version = "0.6.0" }
+embassy-time = { version = "0.3.2", features = ["tick-hz-32_768"] }
+
+[dependencies.embassy-executor]
+version = "0.6.0"
+features = ["arch-cortex-m", "executor-thread", "executor-interrupt", "integrated-timers"]
+
+[dependencies.va416xx-hal]
+path = "../../va416xx-hal"
+features = ["va41630"]

examples/embassy/src/main.rs

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+#![no_std]
+#![no_main]
+use embassy_executor::Spawner;
+use embassy_time::Timer;
+use embedded_hal::digital::StatefulOutputPin;
+use panic_rtt_target as _;
+use rtt_target::{rprintln, rtt_init_print};
+use va416xx_hal::{gpio::PinsG, pac};
+
+// main is itself an async function.
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    rtt_init_print!();
+    rprintln!("VA416xx RTT Demo");
+
+    let mut dp = pac::Peripherals::take().unwrap();
+    let portg = PinsG::new(&mut dp.sysconfig, dp.portg);
+    let mut led = portg.pg5.into_readable_push_pull_output();
+    loop {
+        Timer::after_millis(200).await;
+        led.toggle().ok();
+    }
+}