Nuvoton: Fix NuMaker I2C timeout

[cyliangtw]

Summary of changes

This PR is to fix I2C timeout measurement for NuMaker platforms instead of hardcode max timer count.

Impact of changes

Migration actions required

Documentation

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@cyliangtw, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[0xc0170]

Please add details to the commit message how is this fixing (was 0xffffff causing an issue on the bus , what was it?)

Pull request has been modified.

[cyliangtw]

Please add details to the commit message how is this fixing (was 0xffffff causing an issue on the bus , what was it?)

@0xc0170 , I added more details to this commit message. As while H/W timer counting overflow, it will encounter i2c fake time out and impact i2c application.

[0xc0170]

Can you review gitattributetest, something isn ot correct. running git diff --exit-code failed.

Pull request has been modified.

[cyliangtw]

@0xc0170 , Resolved gitattributetest issue by commit 3916026 and it already passed travis-ci/gitattributestest.

[0xc0170]

One thought: shouldn't we use us_timestamp_t ticker_read_us(const ticker_data_t *const ticker); instead of us ticker?

[0xc0170]

CI started

[cyliangtw]

One thought: shouldn't we use us_timestamp_t ticker_read_us(const ticker_data_t *const ticker); instead of us ticker?

@0xc0170 , ticker_read_us() is upper layer API and need critical section overhead. us_ticker_read() is low level API and could get more efficiency. Anyway, these 2 ways could achieve the same goal.

[mbed-ci]

Jenkins CI Test : ✔️ SUCCESS

Build Number: 1 | 🔒 Jenkins CI Job | 🌐 Logs & Artifacts

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jobs	Status
jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_build-ARM	✔️
jenkins-ci/mbed-os-ci_build-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️
jenkins-ci/mbed-os-ci_dynamic-memory-usage	✔️
jenkins-ci/mbed-os-ci_cloud-client-pytest	✔️