fix: Wio Tracker LED on P1.01, move SimpleLed to board layer

Per the Wio Tracker L1 schematic, it has a green LED on P1.01.
Moved SimpleLed from driver/ to board layer (esp32s3.rs and
wio_tracker_l1.rs) since the impl needs HAL-specific Output types.
Removed driver/simple_led.rs — each board layer defines its own.
RAK WisBlock remains LedDriver=() (no user LED on the core module).

firmware/src/board/esp32s3.rs

@@ -18,6 +18,20 @@ use crate::hal::esp32s3 as mcu;
 
 pub use mcu::{I2cBus as DisplayI2c, SpiBus};
 
+// ── LED driver ──────────────────────────────────────────────────────
+
+pub struct SimpleLed(pub Output<'static>);
+
+impl super::traits::RgbLed for SimpleLed {
+    async fn set_rgb(&mut self, r: u8, g: u8, b: u8) {
+        if r > 0 || g > 0 || b > 0 {
+            self.0.set_high();
+        } else {
+            self.0.set_low();
+        }
+    }
+}
+
 // ── Concrete peripheral types ───────────────────────────────────────
 
 type Nss = Output<'static>;

firmware/src/board/heltec_v3.rs

@@ -11,7 +11,7 @@ use static_cell::StaticCell;
 
 use super::esp32s3;
 use super::traits::{BoardParts, LoRaBoard};
-use crate::driver::simple_led::SimpleLed;
+use super::esp32s3::SimpleLed;
 use crate::hal::esp32s3 as mcu;
 
 pub use super::esp32s3::{
@@ -84,7 +84,7 @@ impl LoRaBoard for Board {
 
         // White LED on GPIO35
         let led_pin = Output::new(p.GPIO35, Level::Low, OutputConfig::default());
-        let led = Some(SimpleLed::new(led_pin));
+        let led = Some(SimpleLed(led_pin));
 
         BoardParts {
             radio,

firmware/src/board/heltec_v3_uart.rs

@@ -10,7 +10,7 @@ use esp_hal::gpio::{Level, Output, OutputConfig};
 
 use super::esp32s3;
 use super::traits::{BoardParts, LoRaBoard};
-use crate::driver::simple_led::SimpleLed;
+use super::esp32s3::SimpleLed;
 use crate::hal::esp32s3 as mcu;
 
 pub use super::esp32s3::{
@@ -80,7 +80,7 @@ impl LoRaBoard for Board {
 
         // White LED on GPIO35
         let led_pin = Output::new(p.GPIO35, Level::Low, OutputConfig::default());
-        let led = Some(SimpleLed::new(led_pin));
+        let led = Some(SimpleLed(led_pin));
 
         BoardParts {
             radio,

firmware/src/board/heltec_v4.rs

@@ -3,7 +3,7 @@ use static_cell::StaticCell;
 
 use super::esp32s3;
 use super::traits::{BoardParts, LoRaBoard};
-use crate::driver::simple_led::SimpleLed;
+use super::esp32s3::SimpleLed;
 use crate::hal::esp32s3 as mcu;
 
 pub use super::esp32s3::{
@@ -77,7 +77,7 @@ impl LoRaBoard for Board {
 
         // Orange LED on GPIO35
         let led_pin = Output::new(p.GPIO35, Level::Low, OutputConfig::default());
-        let led = Some(SimpleLed::new(led_pin));
+        let led = Some(SimpleLed(led_pin));
 
         BoardParts {
             radio,

firmware/src/board/wio_tracker_l1.rs

@@ -20,7 +20,22 @@ type RadioSpiDevice = SpiDevice<'static, NoopRawMutex, mcu::SpiBus, Nss>;
 pub type RadioDriver = Sx126x<RadioSpiDevice, Iv, Sx1262>;
 pub type UsbDriver = mcu::UsbNrfDriver;
 pub type DisplayI2c = mcu::I2cBus;
-pub type LedDriver = ();
+
+// ── LED driver (green LED on P1.01) ─────────────────────────────────
+
+pub struct SimpleLed(pub Output<'static>);
+
+impl super::traits::RgbLed for SimpleLed {
+    async fn set_rgb(&mut self, r: u8, g: u8, b: u8) {
+        if r > 0 || g > 0 || b > 0 {
+            self.0.set_high();
+        } else {
+            self.0.set_low();
+        }
+    }
+}
+
+pub type LedDriver = SimpleLed;
 
 pub type DisplayDriver = crate::driver::sh1106::Sh1106<DisplayI2c>;
 
@@ -67,7 +82,7 @@ impl LoRaBoard for Board {
     type CommParts = UsbParts;
     type DisplayParts = DisplayParts;
     type DisplayDriver = DisplayDriver;
-    type LedDriver = ();
+    type LedDriver = LedDriver;
 
     fn init() -> Self {
         let mut config = embassy_nrf::config::Config::default();
@@ -81,7 +96,7 @@ impl LoRaBoard for Board {
         mcu::mac_address()
     }
 
-    fn into_parts(self) -> BoardParts<RadioParts, UsbParts, DisplayParts, ()> {
+    fn into_parts(self) -> BoardParts<RadioParts, UsbParts, DisplayParts, LedDriver> {
         let p = self.p;
 
         // ── SPI bus for SX1262 ──────────────────────────────────
@@ -131,11 +146,15 @@ impl LoRaBoard for Board {
         );
         let display = Some(DisplayParts { i2c });
 
+        // Green LED on P1.01
+        let led_pin = Output::new(p.P1_01, Level::Low, OutputDrive::Standard);
+        let led = Some(SimpleLed(led_pin));
+
         BoardParts {
             radio,
             host,
             display,
-            led: None,
+            led,
             mac: Self::mac_address(),
         }
     }

firmware/src/driver/mod.rs

@@ -1,5 +1,2 @@
 #[cfg(feature = "wio_tracker_l1")]
 pub mod sh1106;
-
-#[cfg(any(feature = "heltec_v3", feature = "heltec_v3_uart", feature = "heltec_v4"))]
-pub mod simple_led;

firmware/src/driver/simple_led.rs

@@ -1,28 +0,0 @@
-//! Simple single-color LED driver (GPIO on/off).
-//!
-//! For boards with a plain LED (not addressable RGB). Any non-zero
-//! RGB value turns the LED on; all zeros turns it off.
-
-use esp_hal::gpio::Output;
-
-use crate::board::RgbLed;
-
-pub struct SimpleLed {
-    pin: Output<'static>,
-}
-
-impl SimpleLed {
-    pub fn new(pin: Output<'static>) -> Self {
-        Self { pin }
-    }
-}
-
-impl RgbLed for SimpleLed {
-    async fn set_rgb(&mut self, r: u8, g: u8, b: u8) {
-        if r > 0 || g > 0 || b > 0 {
-            self.pin.set_high();
-        } else {
-            self.pin.set_low();
-        }
-    }
-}