Added feature flag for single packet messages so we can have an optimized version when we don't need to check data over multiple packets.

Cargo.toml

@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.3.2"
+version = "0.3.3"
 edition = "2021"
 repository = "https://git.bfpower.io/BFPOWER/physical"
 readme = "README.md"

node/Cargo.toml

@@ -9,6 +9,7 @@ license.workspace = true
 
 [features]
 comms = []
+single-packet-msgs = []
 usb = ["embassy-usb"]
 stm32 = ["embassy-stm32", "physical/stm32"]
 

node/src/stm32/usb.rs

@@ -18,11 +18,17 @@ impl comms::Sender for TypedInterIn {
 }
 
 impl comms::Receiver for TypedInterOut {
+    #[cfg(feature = "single-packet-msgs")]
     async fn receive(&mut self, buffer: &mut [u8]) -> Result<(), comms::Reset> {
-        // This should be OK because all our messages are smaller than a single packet.
+        // This is OK when all our messages are smaller than a single packet.
         self.read(buffer)
             .await
             .map(|_| ())
             .map_err(|_| comms::Reset)
     }
+    
+    #[cfg(not(feature = "single-packet-msgs"))]
+    async fn receive(&mut self, buffer: &mut [u8]) -> Result<(), comms::Reset> { 
+        todo!("Decide if we want a general purpose multi-packet message receive")
+    }
 }