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rp usb: wait for accept() completion

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This ensures that the current response has finished being sent
before the subsequent set_address() happens. Otherwise connecting
a device is intermittent, can fail depending on timing.
This commit is contained in:
Matt Johnston 2022-10-21 22:02:13 +08:00
parent bf0ad38640
commit 866a42f3ae
1 changed files with 13 additions and 1 deletions
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14
embassy-rp/src/usb.rs
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@ -811,8 +811,8 @@ impl<'d, T: Instance> driver::ControlPipe for ControlPipe<'d, T> {
async move {
trace!("control: accept");
let bufcontrol = T::dpram().ep_in_buffer_control(0);
unsafe {
let bufcontrol = T::dpram().ep_in_buffer_control(0);
bufcontrol.write(|w| {
w.set_length(0, 0);
w.set_pid(0, true);
@ -826,6 +826,18 @@ impl<'d, T: Instance> driver::ControlPipe for ControlPipe<'d, T> {
w.set_available(0, true);
});
}
// wait for completion before returning, needed so
// set_address() doesn't happen early.
poll_fn(|cx| {
EP_IN_WAKERS[0].register(cx.waker());
if unsafe { bufcontrol.read().available(0) } {
Poll::Pending
} else {
Poll::Ready(())
}
})
.await;
}
}