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Signed-off-by: Damien George <damien@micropython.org>
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Signed-off-by: Damien George <damien@micropython.org>
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Getting this test running on stm32- and mimxrt-based boards requires adding
a small delay after constructing the UART so that the initial idle frame
has time to be transmitted before the test starts.
Also, the timing margin needs to account for an additional 1-bit worth of
time on some MCUs.
Thanks to @robert-hh for the esp32, mimxrt and samd settings.
Signed-off-by: Damien George <damien@micropython.org>
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Prior to this commit, when flushing a UART on the rp2 port, it returns just
before the last character is sent out the wire.
Fix this by waiting until the BUSY flag is cleared.
This also fixes the behaviour of `UART.txdone()` to return `True` only when
the last byte has gone out.
Updated docs and tests to match. The test now checks that UART TX time is
very close to the expected time (prior, it was just testing that the TX
time was less than the expected time).
Signed-off-by: Damien George <damien@micropython.org>
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Currently only runs on rp2 but could be extended to run on other targets.
Signed-off-by: robert-hh <robert@hammelrath.com>
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