LPC11U24: Fix baremetal build and runtime error

[hugueskamba]

Summary of changes

• Add USTICKER support for LPC11U24.
• Add tickless-from-us-ticker and boot-stack-size overrides.

Impact of changes

It is now possible to build LPC11U24 with the baremetal profile.
i.e It is now possible to build mbed-os-example-blinky-baremetal with $ mbed compile -t gcc_arm -m lpc11u24

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

@mprse

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[ciarmcom]

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

[bulislaw]

I don't think that will work, even if it compiles. I think the us ticker is required:

mbed-os/platform/source/mbed_os_timer.cpp

Line 44 in 5e69377

OsTimer *init_os_timer()

@kjbracey-arm do you remember why is it an assert not compile time error? Also there's some commented out code there

[0xc0170]

Looking at mbed_os_timer, it should work (it requires us ticket only if sleep from us ticker is enabled?). us ticker is not requirement (there is a fallback for wait() to use ns instead).

However mbed os timer needs a ticker.

plus https://github.com/ARMmbed/mbed-os/blob/5e693778f46a0c349159a1aab8347151c0022db9/platform/source/mbed_os_timer.cpp#L58 should be removed as noted.

@kjbracey-arm Please review

[bulislaw]

Hm will it run tests? I remember back in the day usticker was a dependency.

[0xc0170]

Hm will it run tests? I remember back in the day usticker was a dependency.

Me as well. Surprised to see a target without us ticker. I would expect having this target disabled but if no one has objected until now - was it used or not?

[toyowata]

The change was already merged by the PR #12134

@hugueskamba
To fix baremetal build error and runtime failure for the target, you will need to:-

• Add USTICKER feature in the targets.json (I think the target LPC11U24 does support usticker, but the configuration was not updated for long time)
• Add tickless-from-us-ticker and boot-stack-size properly (see https://github.com/ARMmbed/mbed-os/pull/12134/files)

[hugueskamba]

The change was already merged by the PR #12134

@hugueskamba
To fix baremetal build error and runtime failure for the target, you will need to:-

• Add USTICKER feature in the targets.json (I think the target LPC11U24 does support usticker, but the configuration was not updated for long time)
• Add tickless-from-us-ticker and boot-stack-size properly (see https://github.com/ARMmbed/mbed-os/pull/12134/files)

Thanks @toyowata
Done.

[adbridge]

I'll run this through CI while awaiting the review

[mbed-ci]

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 1
Build artifacts