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Improve uart gpio test #25

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LinjingZhang
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By creating this pull request you agree to the terms in CONTRIBUTING.md.
https://github.com/Infineon/.github/blob/master/CONTRIBUTING.md
--- DO NOT DELETE ANYTHING ABOVE THIS LINE ---

CONTRIBUTING.md also tells you what to expect in the PR process.

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some documentation or minor fix after running the test for xmc4arduino 4.x

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@LinjingZhang LinjingZhang force-pushed the improve-uart-gpio-test branch from 0252a1c to f71e928 Compare April 11, 2025 15:27
@LinjingZhang
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I searched and recalled what open-drain output mode is: set the pin to HIGH in open-drain mode puts the pin in a high-impedance state. To pass the test, it assumes the presence of an internal/external pull-up resistor on the line to ensure the pin is set to high.

That is why I consider disable HIGH check for that test case.

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