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Improve Bluetooth credit handling and Switch 2 connection timing

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Joey Yakimowich-Payne 2026-09-09 10:40:25 -06:00
commit 7c1c37a84e
13 changed files with 408 additions and 71 deletions
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README.md
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@ -336,6 +336,14 @@ still reads older 32-byte responses and treats their missing counters as
unreported, not zero. These count firmware queue discards/rejections, not
physical actuator-delivery receipts.
Receive-credit commands use a separate, word-aligned buffer so pending outgoing
ACL fragments cannot block receive-credit returns. This is enabled by default
with credit batching; `-DSWITCH_PICO_HCI_CREDIT_BUFFER=OFF` restores the shared
buffer for comparison. It does not change radio scheduling, pairing policy, or
the controller's credit limits. See the
[credit-buffer results](HAPTICS_EXPERIMENT.md#dedicated-receive-credit-buffer)
for the distinction between host-side progress and measured gameplay latency.
### Per-controller profiles
@ -496,21 +504,23 @@ results do **not** establish lossless arbitrary workloads or perceptual
equivalence. All 40 profiles, names, active selections and adapter
configuration were preserved during this upgrade.
**Joy-Con 2 connection timing:** both halves now request **7.5 ms BLE connection
intervals**, in Paired and Individual modes, including while Classic controllers
are connected. This deliberately replaces their earlier automatic 30 ms slowdown
to favor Joy-Con responsiveness and rumble quality. Other Switch 2 models retain
the existing coexistence policy: 30 ms when at least two physical Switch 2 links
are present, otherwise 7.5 ms. Unrelated BLE controllers are not retimed. Bonds,
profiles, HD encoding and the DualSense timeout are unchanged. Negotiated
intervals are reconciled after asynchronous updates and topology changes.
**Switch 2 connection timing:** all supported Switch 2 BLE controllers now request
**7.5 ms connection intervals**, including Switch 2 Pro and both Joy-Con 2 halves
in Paired or Individual mode. The earlier 30 ms policy for multiple Switch 2 links
is removed; additional BLE or Classic controllers do not slow these requests.
Unrelated BLE controllers are not retimed. Bonds, profiles, HD encoding and the
DualSense timeout are unchanged. Initial setup retains ownership of its interval
request; ready links reconcile negotiated intervals with at most one retry per
second. More frequent connection events favor responsiveness but can increase
shared-radio contention; this does not establish lower measured gameplay latency.
The BLE connection interval is not the rumble packet cadence: multiple packets
can travel per connection event. The normal active-output algorithm is unchanged
by this checkpoint; the direct-packet lab fixtures are not release features.
Lifecycle coverage includes Paired/Individual mode changes, Classic arrival and
departure, handle reuse, correcting a slow negotiated Joy-Con interval, unrelated
BLE isolation, and the retained Switch 2 Pro interval/retry policy.
departure, handle reuse, multiple Switch 2 Pro links, correcting slow negotiated
intervals, unrelated BLE isolation, asynchronous settlement across clock wrap
and bounded retries after rejected requests.
**Idle Switch 2 rumble traffic:** the parser sends three successful neutral
writes, then suppresses further idle output. Any successful non-neutral packet