fixup, if ok: wrapper to show command in hex

usbd-storage/src/subclass/scsi.rs

@@ -2,6 +2,7 @@
 
 use crate::transport::Transport;
 use crate::CLASS_MASS_STORAGE;
+use core::fmt::{Debug, Formatter};
 use num_enum::TryFromPrimitive;
 use usb_device::bus::InterfaceNumber;
 use usb_device::bus::UsbBus;
@@ -40,16 +41,33 @@ const WRITE_10: u8 = 0x2A;
 /* MMC */
 const READ_FORMAT_CAPACITIES: u8 = 0x23;
 
+/// A u8, when printed shown as hex
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+pub struct U8Hex(u8);
+
+impl Debug for U8Hex {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        write!(f, "0x{:02x}", self.0)
+    }
+}
+
+#[cfg(feature = "defmt")]
+impl defmt::Format for U8Hex {
+    fn format(&self, fmt: defmt::Formatter) {
+        defmt::write!(fmt, "0x{:02x}", self.0)
+    }
+}
+
 /// SCSI command
 ///
 /// Refer to specifications (SPC,SAM,SBC,MMC,etc.)
 #[derive(Copy, Clone, Debug)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[non_exhaustive]
 pub enum ScsiCommand {
-    /// Note: When debugging it's shown as decimal but all commands are usually documented in hex.
     Unknown {
-        cmd: u8,
+        cmd: U8Hex,
     },
 
     /* SPC */
@@ -154,7 +172,7 @@ fn parse_cb(cb: &[u8]) -> ScsiCommand {
         READ_FORMAT_CAPACITIES => ScsiCommand::ReadFormatCapacities {
             alloc_len: u16::from_be_bytes([cb[7], cb[8]]),
         },
-        cmd => ScsiCommand::Unknown { cmd },
+        cmd => ScsiCommand::Unknown { cmd: U8Hex(cmd) },
     }
 }