added example code

Author: robamu

src/serial.rs

@@ -350,6 +350,21 @@ uart_pins! {
 }
 
 /// Serial abstraction
+///
+/// # Examples
+/// ```
+/// let dp = pac::Peripherals::take().unwrap();
+/// let rcc = dp.RCC.constrain();
+/// let ccdr = rcc.freeze();
+/// let serial = Serial::usart3(
+///     dp.USART3,
+///     serial::config::Config::default().baudrate(115200.bps()),
+///     ccdr.peripheral.USART3,
+///     &ccdr.clocks
+/// ).unwrap();
+/// // core::fmt::Write is implemented for tx.
+/// writeln!(tx, Test\r").unwrap();
+/// ```
 pub struct Serial<USART> {
     pub(crate) usart: USART,
 }

src/timer.rs

@@ -177,6 +177,21 @@ pub trait TimerExt<TIM> {
 }
 
 /// Hardware timers
+///
+/// # Examples
+///
+/// ```rust
+/// let dp = pac::Peripherals::take().unwrap();
+/// let rcc = dp.RCC.constrain();
+/// let ccdr = rcc.freeze();
+/// let mut timer = Timer::tim1(dp.TIM1, ccdr.peripheral.TIM1, &ccdr.clocks);
+/// timer.start(1.hz());
+/// loop {
+///     // Do something here and then block for 1 second
+///     // do_something();
+///     block(timer.wait()).unwrap();
+/// }
+/// ```
 #[derive(Debug)]
 pub struct Timer<TIM> {
     clk: u32,