Add custom board option to STM32 pins generation script

[AGlass0fMilk]

Summary of changes

Added flag to STM32 pins generation script (tools/targets//STM32_gen_PeripheralPins.py) to enable users to generate PinNames and PeripheralPins files for a custom board.

Using the CubeMX tool, a user can configure the STM32 peripherals to reflect their custom hardware. The user may then save this configuration as a .ioc file from CubeMX. By passing this .ioc file to the STM32_gen_PeripheralPins.py script with the -c or --custom flag, the script will generate appropriate pins/peripheral definitions to create a custom Mbed target for their board.

Impact of changes

Migration actions required

Documentation

None, new flag is documented by script help dialog.

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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

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

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Reviewers

@jeromecoutant
@ARMmbed/team-st-mcd

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[ciarmcom]

@AGlass0fMilk, thank you for your changes.
@jeromecoutant @ARMmbed/mbed-os-tools @ARMmbed/mbed-os-maintainers please review.

[ladislas]

this is amazing! I was just about to ask on the forum how to do that for the STM32F769. :)

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CI started

[mbed-ci]

Test run: FAILED

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Build number : 1
Build artifacts

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• jenkins-ci/mbed-os-ci_greentea-test

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