feat(api): add plug_in_detection

src/types/usb_device.rs

@@ -82,13 +82,6 @@ pub(crate) const ENDPOINTS_ALLOC_LAYOUT: [u16; MAX_ENDPOINTS] = [64, 256, 64, 64
 pub(crate) const ONE_MS_16_MGHZ: u32 = 16000;
 
 impl<const L: usize> UsbDevice<L> {
-    #[inline]
-    pub(crate) fn get_size(&self, cs: CriticalSection<'_>) -> usize {
-        let usb = self.usb.borrow(cs);
-
-        (((usb.uebchx.read().bits() as u16) << 8) | (usb.uebclx.read().bits() as u16)).into()
-    }
-
     #[inline]
     pub fn new(pll: PLL, usb: USB_DEVICE) -> UsbBusAllocator<Self> {
         UsbBusAllocator::new(Self {
@@ -100,7 +93,12 @@ impl<const L: usize> UsbDevice<L> {
         })
     }
 
-    #[inline]
+    #[inline(always)]
+    pub fn plug_in_detect(&self, cs: CriticalSection<'_>) -> bool {
+        self.usb.borrow(cs).usbsta.read().vbus().bit_is_set()
+    }
+
+    #[inline(always)]
     pub(crate) fn allocated_endpoints(&self) -> impl Iterator<Item = (usize, &USBEndpoint)> {
         self.ep_table
             .iter()
@@ -178,4 +176,11 @@ impl<const L: usize> UsbDevice<L> {
             Err(exception) => Err(exception),
         }
     }
+
+    #[inline(always)]
+    pub(crate) fn get_size(&self, cs: CriticalSection<'_>) -> usize {
+        let usb = self.usb.borrow(cs);
+
+        (((usb.uebchx.read().bits() as u16) << 8) | (usb.uebclx.read().bits() as u16)).into()
+    }
 }