fix: remove redundant length check

Reviewed-on: #1

src/lib.rs

@@ -46,8 +46,8 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
                         .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)
                 }
@@ -190,6 +190,7 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
 
             if usb.usbcon.read().frzclk().bit_is_clear() {
                 let (mut ep_out, mut ep_in_complete, mut ep_setup) = (0u16, 0u16, 0u16);
+                let pending_ins = self.pending_ins.borrow(cs);
 
                 for (ep_index, _ep) in self.allocated_endpoints() {
                     if self.select_endpoint(cs, ep_index).is_err() {
@@ -204,8 +205,9 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
                             ep_setup |= 1 << ep_index;
                         }
 
-                        if ueintx.txini().bit_is_set() {
+                        if pending_ins.get() & (1 << ep_index) != 0 && ueintx.txini().bit_is_set() {
                             ep_in_complete |= 1 << ep_index;
+                            pending_ins.set(pending_ins.get() & !(1 << ep_index));
                         }
                     }
                 }
@@ -450,6 +452,9 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
                 }
             };
 
+            let pending_ins = self.pending_ins.borrow(cs);
+            pending_ins.set(pending_ins.get() | 1 << ep_addr.index());
+
             Ok(buf.len())
         })
     }

src/types/usb_device.rs

@@ -1,3 +1,5 @@
+use core::cell::Cell;
+
 use avr_device::{
     atmega32u4::{PLL, USB_DEVICE},
     interrupt::{CriticalSection, Mutex},
@@ -6,7 +8,7 @@ use usb_device::{bus::UsbBusAllocator, endpoint::EndpointType, UsbDirection, Usb
 
 #[allow(unused)]
 #[derive(Default, Copy, Clone)]
-pub struct USBEndpoint {
+pub(crate) struct USBEndpoint {
     pub(crate) is_allocated: bool,
     pub(crate) size: u8,
     pub(crate) ep_type: u8,
@@ -70,6 +72,7 @@ pub struct UsbDevice<const L: usize> {
     pub(crate) pll: Mutex<PLL>,
     pub(crate) usb: Mutex<USB_DEVICE>,
     pub(crate) ep_table: [USBEndpoint; L],
+    pub(crate) pending_ins: Mutex<Cell<u8>>,
     pub(crate) dpram_already_used: u16,
 }
 
@@ -85,6 +88,7 @@ impl<const L: usize> UsbDevice<L> {
             pll: Mutex::new(pll),
             usb: Mutex::new(usb),
             ep_table: [USBEndpoint::default(); L],
+            pending_ins: Mutex::new(Cell::new(0u8)),
             dpram_already_used: 0,
         })
     }
@@ -132,10 +136,6 @@ impl<const L: usize> UsbDevice<L> {
         Ok(())
     }
 
-    pub fn get_ep_table(&self) -> &[USBEndpoint] {
-        &self.ep_table
-    }
-
     pub(crate) fn configure_endpoint(
         &self,
         cs: CriticalSection<'_>,