Add led blink indicator

src/main.rs

@@ -4,6 +4,7 @@
 use rp_pico::entry;
 
 use embedded_hal::digital::OutputPin;
+use embedded_hal::digital::StatefulOutputPin;
 
 use rp_pico::hal::pac;
 
@@ -91,6 +92,8 @@ fn main() -> ! {
     .ok()
     .unwrap();
 
+    let timer = hal::timer::Timer::new(pac.TIMER, &mut pac.RESETS, &clocks);
+
     let sio = hal::Sio::new(pac.SIO);
     let pins = rp_pico::Pins::new(
         pac.IO_BANK0,
@@ -122,8 +125,26 @@ fn main() -> ! {
         .self_powered(false)
         .build();
 
+    let mut start_time: u64 = 0;
     loop {
-        led_pin.set_high().unwrap();
+        let interval = match (usb_device.state(), led_pin.is_set_high().unwrap()) {
+            // The USB device has just been created or reset.
+            (UsbDeviceState::Default, true) => 100_000,
+            (UsbDeviceState::Default, false) => 100_000,
+            // The USB device has received an address from the host.
+            (UsbDeviceState::Addressed, true) => 250_000,
+            (UsbDeviceState::Addressed, false) => 250_000,
+            // The USB device has been configured and is fully functional.
+            (UsbDeviceState::Configured, true) => 1_000_000,
+            (UsbDeviceState::Configured, false) => 0,
+            // The USB device has been suspended by the host or it has been unplugged from the USB bus.
+            (UsbDeviceState::Suspend, true) => 25_000,
+            (UsbDeviceState::Suspend, false) => 2_000_000,
+        };
+        if timer.get_counter().ticks() - start_time > interval {
+            led_pin.toggle().unwrap();
+            start_time = timer.get_counter().ticks();
+        }
 
         if !usb_device.poll(&mut [&mut scsi]) {
             continue;
@@ -134,7 +155,6 @@ fn main() -> ! {
         }
 
         let _ = scsi.poll(|command| {
-            led_pin.set_low().unwrap();
             if let Err(err) = process_command(command, &mut state, &mut storage) {
                 //defmt::error!("{}", err);
             }