feat(check): add check for endpoint table length

src/lib.rs

@@ -38,16 +38,14 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
 
                 // If ep_aadr not provided, or current endpoint is allocated, try to find next free endpoint, otherwise return UsbError. //
                 _ => {
-                    let index = self
-                        .ep_table
+                    let index = self.ep_table[1..]
                         .iter()
                         .enumerate()
-                        .skip(1)
                         .find(|(index, ep)| {
                             !ep.is_allocated && max_packet_size <= ENDPOINTS_ALLOC_LAYOUT[*index]
                         })
-                        .ok_or(UsbError::EndpointOverflow)?
-                        .0;
+                        .map(|(index, _)| index)
+                        .ok_or(UsbError::EndpointOverflow)?;
 
                     EndpointAddress::from_parts(index, ep_dir)
                 }

src/types/usb_device.rs

@@ -84,6 +84,7 @@ pub(crate) const ONE_MS_16_MGHZ: u32 = 16000;
 impl<const L: usize> UsbDevice<L> {
     #[inline]
     pub fn new(pll: PLL, usb: USB_DEVICE) -> UsbBusAllocator<Self> {
+        if L > 1 {
             UsbBusAllocator::new(Self {
                 pll: Mutex::new(pll),
                 usb: Mutex::new(usb),
@@ -91,6 +92,9 @@ impl<const L: usize> UsbDevice<L> {
                 pending_ins: Mutex::new(Cell::new(0u8)),
                 dpram_already_used: 0,
             })
+        } else {
+            panic!("Endpoint table cannot be with length <= 1")
+        }
     }
 
     #[inline(always)]