Add example that uses MRT as embedded-time clock

Cargo.toml

@@ -159,6 +159,10 @@ required-features = ["rt-selected", "82x"]
 name              = "i2c_eeprom"
 required-features = ["rt-selected"]
 
+[[example]]
+name              = "mrt_clock"
+required-features = ["rt-selected", "845"]
+
 [[example]]
 name              = "pinint"
 required-features = ["rt-selected", "845"]

examples/mrt_clock.rs

@@ -0,0 +1,32 @@
+#![no_main]
+#![no_std]
+
+extern crate panic_rtt_target;
+
+use embedded_time::{duration::Extensions as _, Clock as _};
+use lpc8xx_hal::{cortex_m_rt::entry, gpio::Level, mrt, Peripherals};
+
+#[entry]
+fn main() -> ! {
+    rtt_target::rtt_init_print!();
+
+    let p = Peripherals::take().unwrap();
+
+    let mut syscon = p.SYSCON.split();
+    let gpio = p.GPIO.enable(&mut syscon.handle);
+    let mut mrt = p.MRT0.split(&mut syscon.handle).mrt0;
+
+    let mut led = p
+        .pins
+        .pio1_1
+        .into_output_pin(gpio.tokens.pio1_1, Level::Low);
+
+    loop {
+        mrt.start(mrt::MAX_VALUE);
+
+        let timer = mrt.new_timer(1u32.seconds());
+        timer.start().unwrap().wait().unwrap();
+
+        led.toggle();
+    }
+}