STM32H7 ADC : dual pad feature update

[jeromecoutant]

Summary of changes

Here is an update for dual pad feature:

If pin is one of the dual pad pins (PA0, PA1, PC2 and PC3):

• if we are using analogin:
  • switch is opened
  • port is configured only for non C pins
• if we are using other feature:
  • switch is opened only for non C pins
  • port is configured

Discussion started in #14707

Minor update:

• ALTC define is replaced by DUAL_PAD for better readibility
  (and remove misunderstanding with mbedtls ALT)
• STM32_gen_PeripheralPins.py updated accordingly

@pennam
@ABOSTM @fpistm

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]

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

[pennam]

@jeromecoutant @ABOSTM @fpistm thanks for this update, I've tested it on the PORTENTA and it works great!

[0xc0170]

CI started

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[pennam]

FYI @facchinm

[jeromecoutant]

Note that this implementation makes available, for ex, PA1 pin as Ethernet ref clock and PA1_C as analog input in parallel.
But this doesn't forbid user to use PA1_C as GPIO...
Maybe you should implement an additional step? or add explicit comment in some doc that, if Ethernet is used, PA1_C can be only AnalogIn ?
Regards,

[pennam]

Thanks for pointing that out!