2 files changed, 18 insertions, 12 deletions

diff --git a/embassy-usb/src/builder.rs b/embassy-usb/src/builder.rs
index e1bf8041f..c7d83e710 100644
--- a/embassy-usb/src/builder.rs
+++ b/embassy-usb/src/builder.rs
@@ -15,6 +15,11 @@ pub struct Config<'a> {
     pub(crate) vendor_id: u16,
     pub(crate) product_id: u16,
 
+    /// Device BCD USB version.
+    ///
+    /// Default: `0x02` ("2.1")
+    pub bcd_usb: u16,
+
     /// Device class code assigned by USB.org. Set to `0xff` for vendor-specific
     /// devices that do not conform to any class.
     ///
@@ -108,6 +113,7 @@ impl<'a> Config<'a> {
             vendor_id: vid,
             product_id: pid,
             device_release: 0x0010,
+            bcd_usb: 0x02,
             manufacturer: None,
             product: None,
             serial_number: None,
diff --git a/embassy-usb/src/descriptor.rs b/embassy-usb/src/descriptor.rs
index 06ebe0481..8824a0355 100644
--- a/embassy-usb/src/descriptor.rs
+++ b/embassy-usb/src/descriptor.rs
@@ -326,11 +326,11 @@ 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.bcd_usb >> 8) as u8, // bcdUSB
+        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,
@@ -353,13 +353,13 @@ pub(crate) fn device_qualifier_descriptor(config: &Config) -> [u8; 10] {
         10,   // bLength
         0x06, // 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
-        1,                        // bNumConfigurations
-        0,                        // Reserved
+        (config.bcd_usb >> 8) as u8, // bcdUSB
+        config.device_class,         // bDeviceClass
+        config.device_sub_class,     // bDeviceSubClass
+        config.device_protocol,      // bDeviceProtocol
+        config.max_packet_size_0,    // bMaxPacketSize0
+        1,                           // bNumConfigurations
+        0,                           // Reserved
     ]
 }