add missing common.h file for 25-signal example

[next-ramses]

Description

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Test A
• Test B

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[yunwei37]

Thanks for your help!

But I think maybe itwould be better to change the tutorial documents to using signal.h instead of common.h? The code is correct but there is some issue with the documents...

[yunwei37]

Thanks for your help!

But I think maybe itwould be better to change the tutorial documents to using signal.h instead of common.h? The code is correct but there is some issue with the documents. You can change the code in README.md.