Add pipe::NO_DATA_STAGE const for convenience.

For use in `control_req`'s buffer argument if no data stage is
required. It was either this or have a separate function.

1 files changed, 3 insertions, 3 deletions

diff --git a/usbh/src/device.rs b/usbh/src/device.rs
index eeaa33b..bdb993e 100644
--- a/usbh/src/device.rs
+++ b/usbh/src/device.rs
@@ -1,4 +1,4 @@
-use super::pipe::{Pipe, PipeErr, PipeTable};
+use super::pipe::{Pipe, PipeErr, PipeTable, NO_DATA_STAGE};
 use super::usbproto::*;
 
 use core::convert::TryInto;
@@ -199,7 +199,7 @@ impl Device {
                     RequestCode::SetConfiguration,
                     WValue::from((conf, 0)),
                     0,
-                    Option::<&mut ()>::None,
+                    NO_DATA_STAGE,
                     self.millis,
                 )?;
                 debug!(" -- configuration set");
@@ -214,7 +214,7 @@ impl Device {
                     RequestCode::GetInterface, // This is also idle, but can't have two enums with the same value.
                     WValue::from((0, 0)),
                     0,
-                    Option::<&mut ()>::None,
+                    NO_DATA_STAGE,
                     self.millis,
                 )?;
                 debug!(" -- idle set");