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feat(hid): implement lower-latency consistency algo

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This commit is contained in:
Naxdy 2024-04-19 14:20:14 +02:00
parent d661abc882
commit 1d51c12bc1
Signed by: Naxdy
GPG key ID: CC15075846BCE91B
1 changed files with 15 additions and 12 deletions
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27
src/gcc_hid.rs
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@ -13,7 +13,7 @@ use embassy_rp::{
};
use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, mutex::Mutex, signal::Signal};
use embassy_time::{Duration, Instant, Ticker, Timer};
use embassy_time::{Duration, Instant, Timer};
use embassy_usb::{
class::hid::{HidReaderWriter, ReportId, RequestHandler, State},
control::OutResponse,
@ -361,7 +361,8 @@ pub async fn usb_transfer_task(raw_serial: [u8; 8], driver: Driver<'static, USB>
let mut gcc_subscriber = CHANNEL_GCC_STATE.subscriber().unwrap();
let mut last_report_time = Instant::now();
let mut ticker = Ticker::every(Duration::from_micros(8333));
let mut frame_ready_time = Instant::now() + Duration::from_micros(8333);
let mut usb_ready_time = Instant::now() + Duration::from_millis(8);
loop {
// This is what we like to call a "hack".
@ -383,9 +384,18 @@ pub async fn usb_transfer_task(raw_serial: [u8; 8], driver: Driver<'static, USB>
Timer::at(last_report_time + Duration::from_micros(8100)).await;
}
InputConsistencyMode::ConsistencyHack => {
// Ticker better maintains a consistent interval than Timer, so
// we prefer it for consistency mode, where we send reports regularly.
ticker.next().await;
// Ensure we report in multiples of 1 (not in decimals, like 8.33ms)
Timer::at(usb_ready_time).await;
while Instant::now() < frame_ready_time {
Timer::after_micros(1000).await;
}
// has to be done this way in case we're behind through e.g. suspends
while frame_ready_time < Instant::now() {
frame_ready_time += Duration::from_micros(8333);
}
while usb_ready_time < Instant::now() {
usb_ready_time += Duration::from_millis(8);
}
}
InputConsistencyMode::Original => {}
}
@ -404,13 +414,6 @@ pub async fn usb_transfer_task(raw_serial: [u8; 8], driver: Driver<'static, USB>
let polltime = currtime.duration_since(last_report_time);
let micros = polltime.as_micros();
debug!("Report written in {}us", micros);
// If we're sending reports too fast in regular consistency mode, reset the ticker.
// This might happen right after plug-in, or after suspend.
if input_consistency_mode == InputConsistencyMode::ConsistencyHack
&& micros < 8150
{
ticker.reset()
}
last_report_time = currtime;
}
Err(e) => warn!("Failed to send report: {:?}", e),