Add led toggle

src/main.rs

@@ -9,6 +9,7 @@
 
 use esp_hal::{
     clock::CpuClock,
+    gpio::{Output, OutputConfig},
     main,
     time::{Duration, Instant},
 };
@@ -54,8 +55,15 @@ fn main() -> ! {
 
     esp_alloc::heap_allocator!(#[esp_hal::ram(reclaimed)] size: 98768);
 
+    let mut led = Output::new(
+        peripherals.GPIO21,
+        esp_hal::gpio::Level::High,
+        OutputConfig::default(),
+    );
+
     loop {
         log::info!("Hello world!");
+        led.toggle();
         let delay_start = Instant::now();
         while delay_start.elapsed() < Duration::from_millis(500) {}
     }