Disable serial IDLE event test

Author: Sh3Rm4n

src/serial.rs

@@ -46,6 +46,7 @@ use cortex_m::interrupt;
 #[cfg_attr(feature = "enumset", derive(EnumSetType))]
 #[cfg_attr(not(feature = "enumset"), derive(Copy, Clone, PartialEq, Eq))]
 #[non_exhaustive]
+// TODO: Split up in transmission and reception events (RM0316 29.7)
 pub enum Event {
     /// Transmit data register empty / new data can be sent.
     ///

testsuite/tests/uart.rs

@@ -394,6 +394,9 @@ mod tests {
             unwrap!(nb::block!(serial.write(b'A')).ok());
         });
 
+        // FIXME: This test is sensitive to timing and the event might already be triggered by a
+        // previous transmission. (More details about IDLE event RM0316 29.8.1)
+        #[cfg(feature = "disabled")]
         trigger_event(Event::Idle, &mut serial, |serial| {
             // Note: The IDLE bit will not be set again until the RXNE bit has been set (i.e. a new
             // idle line occurs).