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usb: Read ints rather than sie_status in poll (#493)

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If the latency is too high, there is a risk that the status reverts to a
previous state while keeping the interrupt flag up.
This fixes that by relying on ints instead of sie_status to process the
events.
This commit is contained in:
Wilfried Chauveau 2022-11-28 18:08:23 +00:00 committed by GitHub
parent 0055dbaf87
commit 119534d2da
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1 changed files with 7 additions and 7 deletions
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14
rp2040-hal/src/usb.rs
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@ -615,12 +615,12 @@ impl UsbBusTrait for UsbBus {
}
// check for bus reset and/or suspended states.
let sie_status = inner.ctrl_reg.sie_status.read();
let ints = inner.ctrl_reg.ints.read();
let mut buff_status = inner.ctrl_reg.buff_status.read().bits();
if sie_status.bus_reset().bit_is_set() {
if ints.bus_reset().bit_is_set() {
#[cfg(feature = "rp2040-e5")]
if sie_status.connected().bit_is_clear() {
if inner.ctrl_reg.sie_status.read().connected().bit_is_clear() {
inner.errata5_state = Some(errata5::Errata5State::start());
return PollResult::None;
} else {
@ -629,11 +629,11 @@ impl UsbBusTrait for UsbBus {
#[cfg(not(feature = "rp2040-e5"))]
return PollResult::Reset;
} else if buff_status == 0 && sie_status.setup_rec().bit_is_clear() {
if sie_status.suspended().bit_is_set() {
} else if buff_status == 0 && ints.setup_req().bit_is_clear() {
if ints.dev_suspend().bit_is_set() {
inner.ctrl_reg.sie_status.write(|w| w.suspended().set_bit());
return PollResult::Suspend;
} else if sie_status.resume().bit_is_set() {
} else if ints.dev_resume_from_host().bit_is_set() {
inner.ctrl_reg.sie_status.write(|w| w.resume().set_bit());
return PollResult::Resume;
}
@ -664,7 +664,7 @@ impl UsbBusTrait for UsbBus {
}
// check for setup request
if sie_status.setup_rec().bit_is_set() {
if ints.setup_req().bit_is_set() {
// Small max_packet_size_ep0 Work-Around
inner.ctrl_dpram.ep_buffer_control[0].modify(|_, w| w.available_0().clear_bit());