Add a control_buf to UsbDevice

examples/nrf/src/bin/usb/cdc_acm.rs

@@ -66,7 +66,6 @@ pub struct CdcAcmClass<'d, D: Driver<'d>> {
 
 struct Control<'a> {
     shared: &'a ControlShared,
-    buf: [u8; 7],
 }
 
 /// Shared data between Control and CdcAcmClass
@@ -97,7 +96,7 @@ impl<'a> Control<'a> {
     }
 }
 
-impl<'a> ControlHandler for Control<'a> {
+impl<'d> ControlHandler for Control<'d> {
     fn reset(&mut self) {
         let shared = self.shared();
         shared.line_coding.lock(|x| x.set(LineCoding::default()));
@@ -139,17 +138,18 @@ impl<'a> ControlHandler for Control<'a> {
         }
     }
 
-    fn control_in(&mut self, req: Request) -> InResponse<'_> {
+    fn control_in<'a>(&'a mut self, req: Request, buf: &'a mut [u8]) -> InResponse<'a> {
         match req.request {
             // REQ_GET_ENCAPSULATED_COMMAND is not really supported - it will be rejected below.
             REQ_GET_LINE_CODING if req.length == 7 => {
                 info!("Sending line coding");
                 let coding = self.shared().line_coding.lock(|x| x.get());
-                self.buf[0..4].copy_from_slice(&coding.data_rate.to_le_bytes());
-                self.buf[4] = coding.stop_bits as u8;
-                self.buf[5] = coding.parity_type as u8;
-                self.buf[6] = coding.data_bits;
-                InResponse::Accepted(&self.buf)
+                assert!(buf.len() >= 7);
+                buf[0..4].copy_from_slice(&coding.data_rate.to_le_bytes());
+                buf[4] = coding.stop_bits as u8;
+                buf[5] = coding.parity_type as u8;
+                buf[6] = coding.data_bits;
+                InResponse::Accepted(&buf[0..7])
             }
             _ => InResponse::Rejected,
         }
@@ -166,11 +166,12 @@ impl<'d, D: Driver<'d>> CdcAcmClass<'d, D> {
     ) -> Self {
         let control = state.control.write(Control {
             shared: &state.shared,
-            buf: [0; 7],
         });
 
         let control_shared = &state.shared;
 
+        assert!(builder.control_buf_len() >= 7);
+
         let comm_if = builder.alloc_interface_with_handler(control);
         let comm_ep = builder.alloc_interrupt_endpoint_in(8, 255);
         let data_if = builder.alloc_interface();

examples/nrf/src/bin/usb/main.rs

@@ -47,6 +47,7 @@ async fn main(_spawner: Spawner, p: Peripherals) {
     let mut device_descriptor = [0; 256];
     let mut config_descriptor = [0; 256];
     let mut bos_descriptor = [0; 256];
+    let mut control_buf = [0; 7];
 
     let mut state = State::new();
 
@@ -56,6 +57,7 @@ async fn main(_spawner: Spawner, p: Peripherals) {
         &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
+        &mut control_buf,
     );
 
     // Create classes on the builder.