WIP: get Heltec V3 working

src/board/heltec_v3.rs

@@ -3,8 +3,8 @@ use esp_hal::gpio::{Level, Output, OutputConfig};
 use super::esp32s3;
 use super::traits::LoRaBoard;
 
-#[allow(unused_imports)] // Re-exported for other modules (display, radio, usb tasks)
-pub use super::esp32s3::{DisplayI2c, DisplayParts, RadioDriver, RadioParts, UsbDriver, UsbParts};
+#[allow(unused_imports)] // Re-exported for other modules (display, radio, uart tasks)
+pub use super::esp32s3::{DisplayI2c, DisplayParts, RadioDriver, RadioParts, UartDriver, UartParts};
 
 // ── Board init ───────────────────────────────────────────────────────
 
@@ -27,23 +27,31 @@ impl LoRaBoard for Board {
 }
 
 impl Board {
-    pub fn into_parts(self) -> (RadioParts, UsbParts, Option<DisplayParts>) {
+    pub fn into_parts(self) -> (RadioParts, UartParts, Option<DisplayParts>) {
         let p = self.p;
 
         esp32s3::start_timer(p.TIMG0);
 
-        // Vext power: GPIO21, active LOW to enable OLED
-        let vext = Output::new(p.GPIO21, Level::Low, OutputConfig::default());
+        // Vext power: GPIO36, active LOW to enable peripherals
+        let vext = Output::new(p.GPIO36, Level::Low, OutputConfig::default());
         core::mem::forget(vext); // hold pin low permanently; drop would reset it
 
         let radio = esp32s3::init_radio(
             p.SPI2, p.DMA_CH0, p.GPIO9, p.GPIO10, p.GPIO11, p.GPIO8, p.GPIO12, p.GPIO14, p.GPIO13,
         );
-        let usb = esp32s3::init_usb(p.USB0, p.GPIO20, p.GPIO19);
+        let uart = esp32s3::init_uart(p.UART0, p.GPIO43, p.GPIO44);
+
+        // SSD1306 display reset: pulse GPIO21 low->high before I2C init
+        let mut display_rst = Output::new(p.GPIO21, Level::Low, OutputConfig::default());
+        esp_hal::delay::Delay::new().delay_millis(10);
+        display_rst.set_high();
+        esp_hal::delay::Delay::new().delay_millis(10);
+        core::mem::forget(display_rst); // hold reset high permanently
+
         let i2c = esp32s3::init_display_i2c(p.I2C0, p.GPIO17, p.GPIO18);
         let mac = Self::mac_address();
         let display = Some(DisplayParts { i2c, mac });
 
-        (radio, usb, display)
+        (radio, uart, display)
     }
 }