RP: Add RTC example to rp2040.

examples/rp/src/bin/rtc.rs

@@ -0,0 +1,33 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_rp::rtc::{DateTime, DayOfWeek, RealTimeClock};
+use embassy_time::{Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+    info!("Hello World!");
+
+    let now = DateTime {
+        year: 2020,
+        month: 5,
+        day: 15,
+        day_of_week: DayOfWeek::Monday,
+        hour: 10,
+        minute: 30,
+        second: 50,
+    };
+
+    let rtc_result = RealTimeClock::new(p.RTC, now);
+    if let Ok(rtc) = rtc_result {
+        // In reality the delay would be much longer
+        Timer::after(Duration::from_millis(20000)).await;
+
+        let _then: DateTime = rtc.now().unwrap();
+    }
+}