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Ran 25 Nov 2025 06:54PM UTC

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Committed 25 Nov 2025 06:50PM UTC coverage: 45.783%. Remained the same

Job # 19680642352.2

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github

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web-flow

Commit Message

pbio/drv/uart: Fix slow SUART on short messages.

This changes two items about the SUART driver:

1. The FIFO trigger level is set to 8 bytes rather than 15.
   This is to reduce the likelihood that we might not be able to
   drain the fifo before it fills up (e.g. if we are already processing
   some other interrupt and for whatever reason it takes too long).
2. The SUART FIFO timeout is decreased from ~10ms to ~100us.
   This means that if the FIFO is not empty, it will fire an interrupt
   after about 100us, causing us to drain it. This prevents consumers
   from having to wait as long for a short message to be received.

Tested by running a simple torture test script a few times.

Fixes https://github.com/pybricks/support/issues/2456

Co-authored-by: David Lechner <david@pybricks.com>

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