Adds a simple_pwm example for the trinket

Author: dalpil

examples/trinket/src/bin/trinket-simple-pwm.rs

@@ -0,0 +1,28 @@
+/*!
+ * Example of using simple_pwm to fade the built-in LED in and out.
+ */
+
+#![no_std]
+#![no_main]
+
+use arduino_hal::simple_pwm::*;
+use panic_halt as _;
+
+#[arduino_hal::entry]
+fn main() -> ! {
+    let dp = arduino_hal::Peripherals::take().unwrap();
+    let pins = arduino_hal::pins!(dp);
+
+    let timer0 = Timer0Pwm::new(dp.TC0, Prescaler::Prescale64);
+
+    // Digital pin 1 is also connected to an onboard LED marked "L"
+    let mut pwm_led = pins.d1.into_output().into_pwm(&timer0);
+    pwm_led.enable();
+
+    loop {
+        for x in (0..=255).chain((0..=254).rev()) {
+            pwm_led.set_duty(x);
+            arduino_hal::delay_ms(10);
+        }
+    }
+}