Merge pull request #2729 from adamgreig/usb-no-dd-buf

usb: remove device_descriptor buffer, store bytes in UsbDevice.inner instead

40 files changed, 33 insertions, 113 deletions

diff --git a/embassy-usb-logger/src/lib.rs b/embassy-usb-logger/src/lib.rs
index 6f4836d21..34d1ca663 100644
--- a/embassy-usb-logger/src/lib.rs
+++ b/embassy-usb-logger/src/lib.rs
@@ -16,7 +16,6 @@ type CS = embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 /// The logger state containing buffers that must live as long as the USB peripheral.
 pub struct LoggerState<'d> {
     state: State<'d>,
-    device_descriptor: [u8; 32],
     config_descriptor: [u8; 128],
     bos_descriptor: [u8; 16],
     msos_descriptor: [u8; 256],
@@ -28,7 +27,6 @@ impl<'d> LoggerState<'d> {
     pub fn new() -> Self {
         Self {
             state: State::new(),
-            device_descriptor: [0; 32],
             config_descriptor: [0; 128],
             bos_descriptor: [0; 16],
             msos_descriptor: [0; 256],
@@ -74,7 +72,6 @@ impl<const N: usize> UsbLogger<N> {
         let mut builder = Builder::new(
             driver,
             config,
-            &mut state.device_descriptor,
             &mut state.config_descriptor,
             &mut state.bos_descriptor,
             &mut state.msos_descriptor,
diff --git a/embassy-usb/src/builder.rs b/embassy-usb/src/builder.rs
index c4705d041..c06107396 100644
--- a/embassy-usb/src/builder.rs
+++ b/embassy-usb/src/builder.rs
@@ -128,7 +128,6 @@ pub struct Builder<'d, D: Driver<'d>> {
     driver: D,
     next_string_index: u8,
 
-    device_descriptor: DescriptorWriter<'d>,
     config_descriptor: DescriptorWriter<'d>,
     bos_descriptor: BosWriter<'d>,
 
@@ -144,7 +143,6 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
     pub fn new(
         driver: D,
         config: Config<'d>,
-        device_descriptor_buf: &'d mut [u8],
         config_descriptor_buf: &'d mut [u8],
         bos_descriptor_buf: &'d mut [u8],
         msos_descriptor_buf: &'d mut [u8],
@@ -167,11 +165,9 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
             _ => panic!("invalid max_packet_size_0, the allowed values are 8, 16, 32 or 64"),
         }
 
-        let mut device_descriptor = DescriptorWriter::new(device_descriptor_buf);
         let mut config_descriptor = DescriptorWriter::new(config_descriptor_buf);
         let mut bos_descriptor = BosWriter::new(DescriptorWriter::new(bos_descriptor_buf));
 
-        device_descriptor.device(&config);
         config_descriptor.configuration(&config);
         bos_descriptor.bos();
 
@@ -183,7 +179,6 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
             control_buf,
             next_string_index: STRING_INDEX_CUSTOM_START,
 
-            device_descriptor,
             config_descriptor,
             bos_descriptor,
 
@@ -199,7 +194,6 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
         self.bos_descriptor.end_bos();
 
         // Log the number of allocator bytes actually used in descriptor buffers
-        info!("USB: device_descriptor used: {}", self.device_descriptor.position());
         info!("USB: config_descriptor used: {}", self.config_descriptor.position());
         info!("USB: bos_descriptor used: {}", self.bos_descriptor.writer.position());
         info!("USB: msos_descriptor used: {}", msos_descriptor.len());
@@ -209,7 +203,6 @@ impl<'d, D: Driver<'d>> Builder<'d, D> {
             self.driver,
             self.config,
             self.handlers,
-            self.device_descriptor.into_buf(),
             self.config_descriptor.into_buf(),
             self.bos_descriptor.writer.into_buf(),
             msos_descriptor,
diff --git a/embassy-usb/src/descriptor.rs b/embassy-usb/src/descriptor.rs
index fa83ef583..eb3d1f53a 100644
--- a/embassy-usb/src/descriptor.rs
+++ b/embassy-usb/src/descriptor.rs
@@ -82,30 +82,6 @@ impl<'a> DescriptorWriter<'a> {
         self.position = start + length;
     }
 
-    pub(crate) fn device(&mut self, config: &Config) {
-        self.write(
-            descriptor_type::DEVICE,
-            &[
-                0x10,
-                0x02,                     // bcdUSB 2.1
-                config.device_class,      // bDeviceClass
-                config.device_sub_class,  // bDeviceSubClass
-                config.device_protocol,   // bDeviceProtocol
-                config.max_packet_size_0, // bMaxPacketSize0
-                config.vendor_id as u8,
-                (config.vendor_id >> 8) as u8, // idVendor
-                config.product_id as u8,
-                (config.product_id >> 8) as u8, // idProduct
-                config.device_release as u8,
-                (config.device_release >> 8) as u8,    // bcdDevice
-                config.manufacturer.map_or(0, |_| 1),  // iManufacturer
-                config.product.map_or(0, |_| 2),       // iProduct
-                config.serial_number.map_or(0, |_| 3), // iSerialNumber
-                1,                                     // bNumConfigurations
-            ],
-        );
-    }
-
     pub(crate) fn configuration(&mut self, config: &Config) {
         self.num_interfaces_mark = Some(self.position + 4);
 
@@ -269,6 +245,33 @@ impl<'a> DescriptorWriter<'a> {
     }
 }
 
+/// Create a new Device Descriptor array.
+///
+/// All device descriptors are always 18 bytes, so there's no need for
+/// a variable-length buffer or DescriptorWriter.
+pub(crate) fn device_descriptor(config: &Config) -> [u8; 18] {
+    [
+        18,   // bLength
+        0x01, // bDescriptorType
+        0x10,
+        0x02,                     // bcdUSB 2.1
+        config.device_class,      // bDeviceClass
+        config.device_sub_class,  // bDeviceSubClass
+        config.device_protocol,   // bDeviceProtocol
+        config.max_packet_size_0, // bMaxPacketSize0
+        config.vendor_id as u8,
+        (config.vendor_id >> 8) as u8, // idVendor
+        config.product_id as u8,
+        (config.product_id >> 8) as u8, // idProduct
+        config.device_release as u8,
+        (config.device_release >> 8) as u8,    // bcdDevice
+        config.manufacturer.map_or(0, |_| 1),  // iManufacturer
+        config.product.map_or(0, |_| 2),       // iProduct
+        config.serial_number.map_or(0, |_| 3), // iSerialNumber
+        1,                                     // bNumConfigurations
+    ]
+}
+
 /// A writer for Binary Object Store descriptor.
 pub struct BosWriter<'a> {
     pub(crate) writer: DescriptorWriter<'a>,
diff --git a/embassy-usb/src/lib.rs b/embassy-usb/src/lib.rs
index 241e33a78..d58950838 100644
--- a/embassy-usb/src/lib.rs
+++ b/embassy-usb/src/lib.rs
@@ -168,8 +168,6 @@ struct Interface {
 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct UsbBufferReport {
-    /// Number of device descriptor bytes used
-    pub device_descriptor_used: usize,
     /// Number of config descriptor bytes used
     pub config_descriptor_used: usize,
     /// Number of bos descriptor bytes used
@@ -191,7 +189,7 @@ struct Inner<'d, D: Driver<'d>> {
     bus: D::Bus,
 
     config: Config<'d>,
-    device_descriptor: &'d [u8],
+    device_descriptor: [u8; 18],
     config_descriptor: &'d [u8],
     bos_descriptor: &'d [u8],
     msos_descriptor: crate::msos::MsOsDescriptorSet<'d>,
@@ -217,7 +215,6 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
         driver: D,
         config: Config<'d>,
         handlers: Vec<&'d mut dyn Handler, MAX_HANDLER_COUNT>,
-        device_descriptor: &'d [u8],
         config_descriptor: &'d [u8],
         bos_descriptor: &'d [u8],
         msos_descriptor: crate::msos::MsOsDescriptorSet<'d>,
@@ -227,6 +224,7 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
         // Start the USB bus.
         // This prevent further allocation by consuming the driver.
         let (bus, control) = driver.start(config.max_packet_size_0 as u16);
+        let device_descriptor = descriptor::device_descriptor(&config);
 
         Self {
             control_buf,
@@ -256,7 +254,6 @@ impl<'d, D: Driver<'d>> UsbDevice<'d, D> {
     /// Useful for tuning buffer sizes for actual usage
     pub fn buffer_usage(&self) -> UsbBufferReport {
         UsbBufferReport {
-            device_descriptor_used: self.inner.device_descriptor.len(),
             config_descriptor_used: self.inner.config_descriptor.len(),
             bos_descriptor_used: self.inner.bos_descriptor.len(),
             msos_descriptor_used: self.inner.msos_descriptor.len(),
@@ -720,7 +717,7 @@ impl<'d, D: Driver<'d>> Inner<'d, D> {
 
         match dtype {
             descriptor_type::BOS => InResponse::Accepted(self.bos_descriptor),
-            descriptor_type::DEVICE => InResponse::Accepted(self.device_descriptor),
+            descriptor_type::DEVICE => InResponse::Accepted(&self.device_descriptor),
             descriptor_type::CONFIGURATION => InResponse::Accepted(self.config_descriptor),
             descriptor_type::STRING => {
                 if index == 0 {
diff --git a/embassy-usb/src/msos.rs b/embassy-usb/src/msos.rs
index 3858c0f51..a285a3ccd 100644
--- a/embassy-usb/src/msos.rs
+++ b/embassy-usb/src/msos.rs
@@ -255,7 +255,7 @@ use sealed::*;
 unsafe fn transmute_write_to<T: Sized>(t: &T, buf: &mut [u8]) {
     let bytes = core::slice::from_raw_parts((t as *const T) as *const u8, size_of::<T>());
     assert!(buf.len() >= bytes.len(), "MS OS descriptor buffer full");
-    (&mut buf[..bytes.len()]).copy_from_slice(bytes);
+    buf[..bytes.len()].copy_from_slice(bytes);
 }
 
 /// Table 9. Microsoft OS 2.0 descriptor wDescriptorType values.
@@ -444,9 +444,9 @@ impl CompatibleIdFeatureDescriptor {
     pub fn new(compatible_id: &str, sub_compatible_id: &str) -> Self {
         assert!(compatible_id.len() <= 8 && sub_compatible_id.len() <= 8);
         let mut cid = [0u8; 8];
-        (&mut cid[..compatible_id.len()]).copy_from_slice(compatible_id.as_bytes());
+        cid[..compatible_id.len()].copy_from_slice(compatible_id.as_bytes());
         let mut scid = [0u8; 8];
-        (&mut scid[..sub_compatible_id.len()]).copy_from_slice(sub_compatible_id.as_bytes());
+        scid[..sub_compatible_id.len()].copy_from_slice(sub_compatible_id.as_bytes());
         Self::new_raw(cid, scid)
     }
 
diff --git a/examples/boot/application/stm32wb-dfu/src/main.rs b/examples/boot/application/stm32wb-dfu/src/main.rs
index 37c3d7d90..929d6802c 100644
--- a/examples/boot/application/stm32wb-dfu/src/main.rs
+++ b/examples/boot/application/stm32wb-dfu/src/main.rs
@@ -41,7 +41,6 @@ async fn main(_spawner: Spawner) {
     config.product = Some("USB-DFU Runtime example");
     config.serial_number = Some("1235678");
 
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -49,7 +48,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [],
diff --git a/examples/boot/bootloader/stm32wb-dfu/src/main.rs b/examples/boot/bootloader/stm32wb-dfu/src/main.rs
index d989fbfdf..093b39f9d 100644
--- a/examples/boot/bootloader/stm32wb-dfu/src/main.rs
+++ b/examples/boot/bootloader/stm32wb-dfu/src/main.rs
@@ -49,7 +49,6 @@ fn main() -> ! {
         let mut buffer = AlignedBuffer([0; WRITE_SIZE]);
         let updater = BlockingFirmwareUpdater::new(fw_config, &mut buffer.0[..]);
 
-        let mut device_descriptor = [0; 256];
         let mut config_descriptor = [0; 256];
         let mut bos_descriptor = [0; 256];
         let mut control_buf = [0; 4096];
@@ -57,7 +56,6 @@ fn main() -> ! {
         let mut builder = Builder::new(
             driver,
             config,
-            &mut device_descriptor,
             &mut config_descriptor,
             &mut bos_descriptor,
             &mut [],
diff --git a/examples/nrf52840/src/bin/usb_ethernet.rs b/examples/nrf52840/src/bin/usb_ethernet.rs
index 3469c6e5f..a7e5c2668 100644
--- a/examples/nrf52840/src/bin/usb_ethernet.rs
+++ b/examples/nrf52840/src/bin/usb_ethernet.rs
@@ -70,7 +70,6 @@ async fn main(spawner: Spawner) {
     config.device_protocol = 0x01;
 
     // Create embassy-usb DeviceBuilder using the driver and config.
-    static DEVICE_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONFIG_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static BOS_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static MSOS_DESC: StaticCell<[u8; 128]> = StaticCell::new();
@@ -78,7 +77,6 @@ async fn main(spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut DEVICE_DESC.init([0; 256])[..],
         &mut CONFIG_DESC.init([0; 256])[..],
         &mut BOS_DESC.init([0; 256])[..],
         &mut MSOS_DESC.init([0; 128])[..],
diff --git a/examples/nrf52840/src/bin/usb_hid_keyboard.rs b/examples/nrf52840/src/bin/usb_hid_keyboard.rs
index 3e86590c4..52f081487 100644
--- a/examples/nrf52840/src/bin/usb_hid_keyboard.rs
+++ b/examples/nrf52840/src/bin/usb_hid_keyboard.rs
@@ -50,7 +50,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -63,7 +62,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/nrf52840/src/bin/usb_hid_mouse.rs b/examples/nrf52840/src/bin/usb_hid_mouse.rs
index 04ad841b7..5d2837793 100644
--- a/examples/nrf52840/src/bin/usb_hid_mouse.rs
+++ b/examples/nrf52840/src/bin/usb_hid_mouse.rs
@@ -43,7 +43,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -55,7 +54,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/nrf52840/src/bin/usb_serial.rs b/examples/nrf52840/src/bin/usb_serial.rs
index aff539b1b..02048e692 100644
--- a/examples/nrf52840/src/bin/usb_serial.rs
+++ b/examples/nrf52840/src/bin/usb_serial.rs
@@ -48,7 +48,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -59,7 +58,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/nrf52840/src/bin/usb_serial_multitask.rs b/examples/nrf52840/src/bin/usb_serial_multitask.rs
index 4e8118fb8..895cca8b9 100644
--- a/examples/nrf52840/src/bin/usb_serial_multitask.rs
+++ b/examples/nrf52840/src/bin/usb_serial_multitask.rs
@@ -67,7 +67,6 @@ async fn main(spawner: Spawner) {
     let state = STATE.init(State::new());
 
     // Create embassy-usb DeviceBuilder using the driver and config.
-    static DEVICE_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONFIG_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static BOS_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static MSOS_DESC: StaticCell<[u8; 128]> = StaticCell::new();
@@ -75,7 +74,6 @@ async fn main(spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut DEVICE_DESC.init([0; 256])[..],
         &mut CONFIG_DESC.init([0; 256])[..],
         &mut BOS_DESC.init([0; 256])[..],
         &mut MSOS_DESC.init([0; 128])[..],
diff --git a/examples/nrf52840/src/bin/usb_serial_winusb.rs b/examples/nrf52840/src/bin/usb_serial_winusb.rs
index 060f9ba94..c6675a3d3 100644
--- a/examples/nrf52840/src/bin/usb_serial_winusb.rs
+++ b/examples/nrf52840/src/bin/usb_serial_winusb.rs
@@ -53,7 +53,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -64,7 +63,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/rp/src/bin/pio_uart.rs b/examples/rp/src/bin/pio_uart.rs
index a07f1c180..53b696309 100644
--- a/examples/rp/src/bin/pio_uart.rs
+++ b/examples/rp/src/bin/pio_uart.rs
@@ -60,7 +60,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -70,7 +69,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/rp/src/bin/usb_ethernet.rs b/examples/rp/src/bin/usb_ethernet.rs
index 01f0d5967..f1b124efa 100644
--- a/examples/rp/src/bin/usb_ethernet.rs
+++ b/examples/rp/src/bin/usb_ethernet.rs
@@ -64,14 +64,12 @@ async fn main(spawner: Spawner) {
     config.device_protocol = 0x01;
 
     // Create embassy-usb DeviceBuilder using the driver and config.
-    static DEVICE_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONFIG_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static BOS_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONTROL_BUF: StaticCell<[u8; 128]> = StaticCell::new();
     let mut builder = Builder::new(
         driver,
         config,
-        &mut DEVICE_DESC.init([0; 256])[..],
         &mut CONFIG_DESC.init([0; 256])[..],
         &mut BOS_DESC.init([0; 256])[..],
         &mut [], // no msos descriptors
diff --git a/examples/rp/src/bin/usb_hid_keyboard.rs b/examples/rp/src/bin/usb_hid_keyboard.rs
index b5ac16245..710be8d13 100644
--- a/examples/rp/src/bin/usb_hid_keyboard.rs
+++ b/examples/rp/src/bin/usb_hid_keyboard.rs
@@ -36,7 +36,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     // You can also add a Microsoft OS descriptor.
@@ -50,7 +49,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/rp/src/bin/usb_hid_mouse.rs b/examples/rp/src/bin/usb_hid_mouse.rs
index afebd8813..e8b399cb1 100644
--- a/examples/rp/src/bin/usb_hid_mouse.rs
+++ b/examples/rp/src/bin/usb_hid_mouse.rs
@@ -39,7 +39,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     // You can also add a Microsoft OS descriptor.
@@ -53,7 +52,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/rp/src/bin/usb_midi.rs b/examples/rp/src/bin/usb_midi.rs
index 95306a35c..11db1b2e1 100644
--- a/examples/rp/src/bin/usb_midi.rs
+++ b/examples/rp/src/bin/usb_midi.rs
@@ -46,7 +46,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -54,7 +53,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/rp/src/bin/usb_raw.rs b/examples/rp/src/bin/usb_raw.rs
index a6c8a5b2e..97e7e0244 100644
--- a/examples/rp/src/bin/usb_raw.rs
+++ b/examples/rp/src/bin/usb_raw.rs
@@ -93,7 +93,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -106,7 +105,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/rp/src/bin/usb_raw_bulk.rs b/examples/rp/src/bin/usb_raw_bulk.rs
index 0dc8e9f72..331c3da4c 100644
--- a/examples/rp/src/bin/usb_raw_bulk.rs
+++ b/examples/rp/src/bin/usb_raw_bulk.rs
@@ -71,7 +71,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -80,7 +79,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/rp/src/bin/usb_serial.rs b/examples/rp/src/bin/usb_serial.rs
index ab24a994c..3c9bc96dd 100644
--- a/examples/rp/src/bin/usb_serial.rs
+++ b/examples/rp/src/bin/usb_serial.rs
@@ -46,7 +46,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -56,7 +55,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/rp/src/bin/usb_serial_with_logger.rs b/examples/rp/src/bin/usb_serial_with_logger.rs
index 4ba4fc25c..f9cfdef94 100644
--- a/examples/rp/src/bin/usb_serial_with_logger.rs
+++ b/examples/rp/src/bin/usb_serial_with_logger.rs
@@ -46,7 +46,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -57,7 +56,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32f1/src/bin/usb_serial.rs b/examples/stm32f1/src/bin/usb_serial.rs
index 1ae6c1dee..ee99acf41 100644
--- a/examples/stm32f1/src/bin/usb_serial.rs
+++ b/examples/stm32f1/src/bin/usb_serial.rs
@@ -60,7 +60,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 7];
@@ -70,7 +69,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32f3/src/bin/usb_serial.rs b/examples/stm32f3/src/bin/usb_serial.rs
index ee1c43afd..5760f2c1c 100644
--- a/examples/stm32f3/src/bin/usb_serial.rs
+++ b/examples/stm32f3/src/bin/usb_serial.rs
@@ -54,7 +54,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 7];
@@ -64,7 +63,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32f4/src/bin/usb_ethernet.rs b/examples/stm32f4/src/bin/usb_ethernet.rs
index 405cce6bc..d2cbeea1b 100644
--- a/examples/stm32f4/src/bin/usb_ethernet.rs
+++ b/examples/stm32f4/src/bin/usb_ethernet.rs
@@ -89,14 +89,12 @@ async fn main(spawner: Spawner) {
     config.device_protocol = 0x01;
 
     // Create embassy-usb DeviceBuilder using the driver and config.
-    static DEVICE_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONFIG_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static BOS_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONTROL_BUF: StaticCell<[u8; 128]> = StaticCell::new();
     let mut builder = Builder::new(
         driver,
         config,
-        &mut DEVICE_DESC.init([0; 256])[..],
         &mut CONFIG_DESC.init([0; 256])[..],
         &mut BOS_DESC.init([0; 256])[..],
         &mut [], // no msos descriptors
diff --git a/examples/stm32f4/src/bin/usb_hid_keyboard.rs b/examples/stm32f4/src/bin/usb_hid_keyboard.rs
index 6c25a0a64..a799b4e72 100644
--- a/examples/stm32f4/src/bin/usb_hid_keyboard.rs
+++ b/examples/stm32f4/src/bin/usb_hid_keyboard.rs
@@ -69,7 +69,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     // You can also add a Microsoft OS descriptor.
@@ -84,7 +83,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/stm32f4/src/bin/usb_hid_mouse.rs b/examples/stm32f4/src/bin/usb_hid_mouse.rs
index d4725d597..0bc236119 100644
--- a/examples/stm32f4/src/bin/usb_hid_mouse.rs
+++ b/examples/stm32f4/src/bin/usb_hid_mouse.rs
@@ -64,7 +64,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -76,7 +75,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32f4/src/bin/usb_raw.rs b/examples/stm32f4/src/bin/usb_raw.rs
index 15a98ff8b..4e583aeb8 100644
--- a/examples/stm32f4/src/bin/usb_raw.rs
+++ b/examples/stm32f4/src/bin/usb_raw.rs
@@ -117,7 +117,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut msos_descriptor = [0; 256];
@@ -130,7 +129,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut msos_descriptor,
diff --git a/examples/stm32f4/src/bin/usb_serial.rs b/examples/stm32f4/src/bin/usb_serial.rs
index 6080b34a8..f3a375d31 100644
--- a/examples/stm32f4/src/bin/usb_serial.rs
+++ b/examples/stm32f4/src/bin/usb_serial.rs
@@ -64,7 +64,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -74,7 +73,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32f7/src/bin/usb_serial.rs b/examples/stm32f7/src/bin/usb_serial.rs
index 26ecf3bc8..39a5512f4 100644
--- a/examples/stm32f7/src/bin/usb_serial.rs
+++ b/examples/stm32f7/src/bin/usb_serial.rs
@@ -64,7 +64,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -74,7 +73,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32g0/src/bin/usb_serial.rs b/examples/stm32g0/src/bin/usb_serial.rs
index 8b9915626..162dfd86b 100644
--- a/examples/stm32g0/src/bin/usb_serial.rs
+++ b/examples/stm32g0/src/bin/usb_serial.rs
@@ -36,7 +36,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 7];
@@ -46,7 +45,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32g4/src/bin/usb_serial.rs b/examples/stm32g4/src/bin/usb_serial.rs
index dc95aa6e5..dbe8f27c1 100644
--- a/examples/stm32g4/src/bin/usb_serial.rs
+++ b/examples/stm32g4/src/bin/usb_serial.rs
@@ -56,7 +56,6 @@ async fn main(_spawner: Spawner) {
     config.device_protocol = 0x01;
     config.composite_with_iads = true;
 
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -66,7 +65,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32h5/src/bin/usb_serial.rs b/examples/stm32h5/src/bin/usb_serial.rs
index 83477c8fa..4f86bb342 100644
--- a/examples/stm32h5/src/bin/usb_serial.rs
+++ b/examples/stm32h5/src/bin/usb_serial.rs
@@ -65,7 +65,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -75,7 +74,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32h7/src/bin/usb_serial.rs b/examples/stm32h7/src/bin/usb_serial.rs
index c3ddda72a..576506ad3 100644
--- a/examples/stm32h7/src/bin/usb_serial.rs
+++ b/examples/stm32h7/src/bin/usb_serial.rs
@@ -65,7 +65,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -75,7 +74,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32l1/src/bin/usb_serial.rs b/examples/stm32l1/src/bin/usb_serial.rs
index f738ea358..653bbd6d2 100644
--- a/examples/stm32l1/src/bin/usb_serial.rs
+++ b/examples/stm32l1/src/bin/usb_serial.rs
@@ -46,7 +46,6 @@ async fn main(_spawner: Spawner) {
     config.device_protocol = 0x01;
     config.composite_with_iads = true;
 
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -56,7 +55,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32l4/src/bin/usb_serial.rs b/examples/stm32l4/src/bin/usb_serial.rs
index 047234d60..198504b59 100644
--- a/examples/stm32l4/src/bin/usb_serial.rs
+++ b/examples/stm32l4/src/bin/usb_serial.rs
@@ -60,7 +60,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -70,7 +69,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32l5/src/bin/usb_ethernet.rs b/examples/stm32l5/src/bin/usb_ethernet.rs
index dc1e7022d..7f73fd677 100644
--- a/examples/stm32l5/src/bin/usb_ethernet.rs
+++ b/examples/stm32l5/src/bin/usb_ethernet.rs
@@ -79,14 +79,12 @@ async fn main(spawner: Spawner) {
     config.device_protocol = 0x01;
 
     // Create embassy-usb DeviceBuilder using the driver and config.
-    static DEVICE_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONFIG_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static BOS_DESC: StaticCell<[u8; 256]> = StaticCell::new();
     static CONTROL_BUF: StaticCell<[u8; 128]> = StaticCell::new();
     let mut builder = Builder::new(
         driver,
         config,
-        &mut DEVICE_DESC.init([0; 256])[..],
         &mut CONFIG_DESC.init([0; 256])[..],
         &mut BOS_DESC.init([0; 256])[..],
         &mut [], // no msos descriptors
diff --git a/examples/stm32l5/src/bin/usb_hid_mouse.rs b/examples/stm32l5/src/bin/usb_hid_mouse.rs
index b86fba455..9d30205bb 100644
--- a/examples/stm32l5/src/bin/usb_hid_mouse.rs
+++ b/examples/stm32l5/src/bin/usb_hid_mouse.rs
@@ -51,7 +51,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -62,7 +61,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32l5/src/bin/usb_serial.rs b/examples/stm32l5/src/bin/usb_serial.rs
index 5e2378b58..a64bda31b 100644
--- a/examples/stm32l5/src/bin/usb_serial.rs
+++ b/examples/stm32l5/src/bin/usb_serial.rs
@@ -47,7 +47,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 7];
@@ -57,7 +56,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors
diff --git a/examples/stm32u5/src/bin/usb_serial.rs b/examples/stm32u5/src/bin/usb_serial.rs
index 33e02ce3b..6a313efb0 100644
--- a/examples/stm32u5/src/bin/usb_serial.rs
+++ b/examples/stm32u5/src/bin/usb_serial.rs
@@ -61,7 +61,6 @@ async fn main(_spawner: Spawner) {
 
     // Create embassy-usb DeviceBuilder using the driver and config.
     // It needs some buffers for building the descriptors.
-    let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
     let mut control_buf = [0; 64];
@@ -71,7 +70,6 @@ async fn main(_spawner: Spawner) {
     let mut builder = Builder::new(
         driver,
         config,
-        &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
         &mut [], // no msos descriptors