fix: remove redundant length check

Reviewed-on: https://gitea.doryan04.ru/TheEmbeddedRust/usb-avr-lib/pulls/1

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "usb_avr"
+name = "usb-avr"
 version = "0.1.0"
 edition = "2021"
 

src/lib.rs

@@ -14,6 +14,10 @@ pub use types::*;
 
 use types::{DPRAM_SIZE, ENDPOINTS_ALLOC_LAYOUT, ONE_MS_16_MGHZ};
 
+const RESTRICT_RW_FLAG: u8 = !(1 << 5);
+const USBINT_CLEAR: u8 = 1 << 0;
+const UDINT_CLEAR: u8 = !(1 << 7 | 1 << 1);
+
 impl<const L: usize> UsbBus for UsbDevice<L> {
     fn alloc_ep(
         &mut self,
@@ -24,60 +28,58 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
         _interval: u8,
     ) -> UsbResult<EndpointAddress> {
         // Handle first endpoint. //
-        free(|_cs| {
-            if ep_addr == Some(EndpointAddress::from_parts(0, UsbDirection::In)) {
-                Ok(ep_addr.unwrap())
-            } else {
-                let address = match ep_addr {
-                    // If current endpoint doesn't allocated, assign ep_addr to variable. //
-                    Some(addr) if !self.ep_table[addr.index()].is_allocated => addr,
 
-                    // If ep_aadr not provided, or current endpoint is allocated, try to find next free endpoint, otherwise return UsbError. //
+        if ep_addr == Some(EndpointAddress::from_parts(0, UsbDirection::In)) {
-                    _ => {
+            ep_addr.ok_or(UsbError::InvalidState)
-                        let index = self
+        } else {
-                            .ep_table
+            let address = match ep_addr {
-                            .iter()
+                // If current endpoint doesn't allocated, assign ep_addr to variable. //
-                            .enumerate()
+                Some(addr) if !self.ep_table[addr.index()].is_allocated => addr,
-                            .skip(1)
-                            .find(|(index, ep)| {
-                                !ep.is_allocated
-                                    && max_packet_size <= ENDPOINTS_ALLOC_LAYOUT[*index]
-                            })
-                            .ok_or(UsbError::EndpointOverflow)?
-                            .0;
 
-                        EndpointAddress::from_parts(index, ep_dir)
+                // If ep_aadr not provided, or current endpoint is allocated, try to find next free endpoint, otherwise return UsbError. //
-                    }
+                _ => {
-                };
+                    let index = self
+                        .ep_table
+                        .iter()
+                        .enumerate()
+                        .skip(1)
+                        .find(|(index, ep)| {
+                            !ep.is_allocated && max_packet_size <= ENDPOINTS_ALLOC_LAYOUT[*index]
+                        })
+                        .map(|(index, _)| index)
+                        .ok_or(UsbError::EndpointOverflow)?;
 
-                // Select endpoint info by address index. //
+                    EndpointAddress::from_parts(index, ep_dir)
-
-                let target_endpoint = &mut self.ep_table[address.index()];
-
-                // Get power of two number of endpoint size. //
-
-                let ep_size = max(8, max_packet_size.next_power_of_two());
-
-                // Endpoint allocation marker. //
-
-                if DPRAM_SIZE - self.dpram_already_used < ep_size {
-                    Err(UsbError::EndpointMemoryOverflow)
-                } else {
-                    // Set endpoint parameters. //
-
-                    target_endpoint.set_dir(ep_dir);
-                    target_endpoint.set_type(ep_type);
-                    target_endpoint.set_size(ep_size)?;
-
-                    // Add used dpram memory. //
-
-                    target_endpoint.is_allocated = true;
-                    self.dpram_already_used += ep_size;
-
-                    Ok(address)
                 }
+            };
+
+            // Select endpoint info by address index. //
+
+            let target_endpoint = &mut self.ep_table[address.index()];
+
+            // Get power of two number of endpoint size. //
+
+            let ep_size = max(8, max_packet_size.next_power_of_two());
+
+            // Endpoint allocation marker. //
+
+            if DPRAM_SIZE - self.dpram_already_used < ep_size {
+                Err(UsbError::EndpointMemoryOverflow)
+            } else {
+                // Set endpoint parameters. //
+
+                target_endpoint.set_dir(ep_dir);
+                target_endpoint.set_type(ep_type);
+                target_endpoint.set_size(ep_size)?;
+
+                // Add used dpram memory. //
+
+                target_endpoint.is_allocated = true;
+                self.dpram_already_used += ep_size;
+
+                Ok(address)
             }
-        })
+        }
     }
 
     fn enable(&mut self) {
@@ -116,7 +118,7 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
             // Endpoint configuration //
 
             self.allocated_endpoints().for_each(|(i, _ep)| {
-                self.configure_endpoint(cs, i).unwrap();
+                let _ = self.configure_endpoint(cs, i);
             });
 
             // Set high speed and attach the USB. //
@@ -132,17 +134,15 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
     }
 
     fn force_reset(&self) -> UsbResult<()> {
-        free(|cs| {
+        let set_detach = |bit| {
-            let usbcon = &self.usb.borrow(cs).usbcon;
+            free(|cs| {
-            usbcon.modify(|_, w| w.usbe().set_bit());
+                self.usb.borrow(cs).udcon.modify(|_, w| w.detach().bit(bit));
-        });
+            });
+        };
 
+        set_detach(true);
         delay_cycles(ONE_MS_16_MGHZ);
-
+        set_detach(false);
-        free(|cs| {
-            let usbcon = &self.usb.borrow(cs).usbcon;
-            usbcon.modify(|_, w| w.usbe().set_bit());
-        });
 
         Ok(())
     }
@@ -162,7 +162,8 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
 
             if usbint.vbusti().bit_is_set() {
                 usb.usbint
-                    .write(|w| unsafe { w.bits(0x01) }.vbusti().clear_bit());
+                    .write(|w| unsafe { w.bits(USBINT_CLEAR) }.vbusti().clear_bit());
+
                 if usb.usbsta.read().vbus().bit_is_set() {
                     return PollResult::Resume;
                 } else {
@@ -184,7 +185,7 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
 
             if udint.sofi().bit_is_set() {
                 usb.udint
-                    .write(|w| unsafe { w.bits(0x7d) }.sofi().clear_bit());
+                    .write(|w| unsafe { w.bits(UDINT_CLEAR) }.sofi().clear_bit());
             }
 
             if usb.usbcon.read().frzclk().bit_is_clear() {
@@ -226,60 +227,62 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
         free(|cs| {
             let usb = self.usb.borrow(cs);
 
-            if let Err(error) = self.select_endpoint(cs, ep_addr.index()) {
+            self.select_endpoint(cs, ep_addr.index())?;
-                Err(error)
-            } else {
-                let ep = &self.ep_table[ep_addr.index()];
 
-                if ep.ep_type == 0 {
+            let ep = &self.ep_table[ep_addr.index()];
-                    let ueintx = usb.ueintx.read();
 
-                    if ueintx.rxouti().bit_is_clear() && ueintx.rxstpi().bit_is_clear() {
+            if ep.ep_type == 0 {
-                        return Err(UsbError::WouldBlock);
+                let ueintx = usb.ueintx.read();
-                    }
 
-                    let buf_size = self.get_size(cs);
+                if ueintx.rxouti().bit_is_clear() && ueintx.rxstpi().bit_is_clear() {
-                    if buf.len() < buf_size {
+                    return Err(UsbError::WouldBlock);
-                        return Err(UsbError::BufferOverflow);
-                    }
-
-                    for byte in &mut buf[..buf_size] {
-                        *byte = usb.uedatx.read().bits();
-                    }
-
-                    usb.ueintx.write(|w| {
-                        unsafe { w.bits(0xdf) }
-                            .rxouti()
-                            .clear_bit()
-                            .rxstpi()
-                            .clear_bit()
-                    });
-
-                    Ok(buf_size)
-                } else {
-                    if usb.ueintx.read().rxouti().bit_is_clear() {
-                        return Err(UsbError::WouldBlock);
-                    }
-                    usb.ueintx
-                        .write(|w| unsafe { w.bits(0xdf) }.rxouti().clear_bit());
-
-                    let mut bytes_read = 0;
-                    for slot in buf {
-                        if usb.ueintx.read().rwal().bit_is_clear() {
-                            break;
-                        }
-                        *slot = usb.uedatx.read().bits();
-                        bytes_read += 1;
-                    }
-
-                    if usb.ueintx.read().rwal().bit_is_set() {
-                        return Err(UsbError::BufferOverflow);
-                    }
-
-                    usb.ueintx
-                        .write(|w| unsafe { w.bits(0xdf) }.fifocon().clear_bit());
-                    Ok(bytes_read)
                 }
+
+                let buf_size = self.get_size(cs);
+
+                if buf.len() < buf_size {
+                    return Err(UsbError::BufferOverflow);
+                }
+
+                for byte in &mut buf[..buf_size] {
+                    *byte = usb.uedatx.read().bits();
+                }
+
+                usb.ueintx.write(|w| {
+                    unsafe { w.bits(RESTRICT_RW_FLAG) }
+                        .rxouti()
+                        .clear_bit()
+                        .rxstpi()
+                        .clear_bit()
+                });
+
+                Ok(buf_size)
+            } else {
+                if usb.ueintx.read().rxouti().bit_is_clear() {
+                    return Err(UsbError::WouldBlock);
+                }
+
+                usb.ueintx
+                    .write(|w| unsafe { w.bits(RESTRICT_RW_FLAG) }.rxouti().clear_bit());
+
+                let mut bytes_read = 0;
+
+                for slot in buf {
+                    if usb.ueintx.read().rwal().bit_is_clear() {
+                        break;
+                    }
+                    *slot = usb.uedatx.read().bits();
+                    bytes_read += 1;
+                }
+
+                if usb.ueintx.read().rwal().bit_is_set() {
+                    return Err(UsbError::BufferOverflow);
+                }
+
+                usb.ueintx
+                    .write(|w| unsafe { w.bits(RESTRICT_RW_FLAG) }.fifocon().clear_bit());
+
+                Ok(bytes_read)
             }
         })
     }
@@ -291,13 +294,13 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
             usb.udint.modify(|_, w| w.eorsti().clear_bit());
 
             self.allocated_endpoints().for_each(|(i, _)| {
-                self.configure_endpoint(cs, i).unwrap();
+                let _ = self.configure_endpoint(cs, i);
             });
 
             // Clear resume informations. //
 
             usb.udint.write(|w| {
-                unsafe { w.bits(0x7d) }
+                unsafe { w.bits(UDINT_CLEAR) }
                     .wakeupi()
                     .clear_bit()
                     .suspi()
@@ -325,7 +328,7 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
             usb.usbcon.modify(|_, w| w.frzclk().clear_bit());
 
             usb.udint.write(|w| {
-                unsafe { w.bits(0x7d) }
+                unsafe { w.bits(UDINT_CLEAR) }
                     .wakeupi()
                     .clear_bit()
                     .suspi()
@@ -369,7 +372,7 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
             let (usb, pll) = (self.usb.borrow(cs), self.pll.borrow(cs));
 
             usb.udint.write(|w| {
-                unsafe { w.bits(0x7d) }
+                unsafe { w.bits(UDINT_CLEAR) }
                     .wakeupi()
                     .clear_bit()
                     .suspi()
@@ -395,14 +398,14 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
         free(|cs| {
             let usb = self.usb.borrow(cs);
 
-            if let Err(error) = self.select_endpoint(cs, ep_addr.index()) {
+            self.select_endpoint(cs, ep_addr.index())?;
-                Err(error)
-            } else {
-                let ep = &self.ep_table[ep_addr.index()];
 
-                // Endpoint type confitions //
+            let ep = &self.ep_table[ep_addr.index()];
 
-                if ep.ep_type == 0 {
+            // Endpoint type confitions //
+
+            match ep.ep_type {
+                0 => {
                     if usb.ueintx.read().txini().bit_is_clear() {
                         return Err(UsbError::WouldBlock);
                     }
@@ -416,13 +419,15 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
                     }
 
                     usb.ueintx
-                        .write(|w| unsafe { w.bits(0xdf) }.txini().clear_bit());
+                        .write(|w| unsafe { w.bits(RESTRICT_RW_FLAG) }.txini().clear_bit());
-                } else {
+                }
+                _ => {
                     if usb.ueintx.read().txini().bit_is_clear() {
                         return Err(UsbError::WouldBlock);
                     }
+
                     usb.ueintx.write(|w| {
-                        unsafe { w.bits(0xdf) }
+                        unsafe { w.bits(RESTRICT_RW_FLAG) }
                             .txini()
                             .clear_bit()
                             .rxouti()
@@ -438,19 +443,19 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
                     }
 
                     usb.ueintx.write(|w| {
-                        unsafe { w.bits(0xdf) }
+                        unsafe { w.bits(RESTRICT_RW_FLAG) }
                             .rxouti()
                             .clear_bit()
                             .fifocon()
                             .clear_bit()
                     });
                 }
+            };
 
-                let pending_ins = self.pending_ins.borrow(cs);
+            let pending_ins = self.pending_ins.borrow(cs);
-                pending_ins.set(pending_ins.get() | 1 << ep_addr.index());
+            pending_ins.set(pending_ins.get() | 1 << ep_addr.index());
 
-                Ok(buf.len())
+            Ok(buf.len())
-            }
         })
     }
 }

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 +93,17 @@ impl<const L: usize> UsbDevice<L> {
         })
     }
 
-    #[inline]
+    #[inline(always)]
+    pub fn get_usb_device<'u>(&'u self, cs: CriticalSection<'u>) -> &'u USB_DEVICE {
+        self.usb.borrow(cs)
+    }
+
+    #[inline(always)]
+    pub fn get_pll<'u>(&'u self, cs: CriticalSection<'u>) -> &'u PLL {
+        self.pll.borrow(cs)
+    }
+
+    #[inline(always)]
     pub(crate) fn allocated_endpoints(&self) -> impl Iterator<Item = (usize, &USBEndpoint)> {
         self.ep_table
             .iter()
@@ -178,4 +181,11 @@ 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()
+    }
 }