RP2: EndpointIn::write doesn't check enabled status

[jamesmunns]

embassy/embassy-rp/src/usb.rs

Lines 605 to 643 in a580437

	async fn write(&mut self, buf: &[u8]) -> Result<(), EndpointError> {
	if buf.len() > self.info.max_packet_size as usize {
	return Err(EndpointError::BufferOverflow);
	}
	trace!("WRITE WAITING");
	let index = self.info.addr.index();
	let val = poll_fn(|cx| {
	EP_IN_WAKERS[index].register(cx.waker());
	let val = T::dpram().ep_in_buffer_control(index).read();
	if val.available(0) {
	Poll::Pending
	} else {
	Poll::Ready(val)
	}
	})
	.await;
	self.buf.write(buf);
	let pid = !val.pid(0);
	T::dpram().ep_in_buffer_control(index).write(|w| {
	w.set_pid(0, pid);
	w.set_length(0, buf.len() as _);
	w.set_full(0, true);
	});
	cortex_m::asm::delay(12);
	T::dpram().ep_in_buffer_control(index).write(|w| {
	w.set_pid(0, pid);
	w.set_length(0, buf.len() as _);
	w.set_full(0, true);
	w.set_available(0, true);
	});
	trace!("WRITE OK");
	Ok(())
	}

I'm pretty sure the EpIn code doesn't check the endpoint status, so if you try to write while USB is disconnected, it'll just hang/sleep forever.