Sync with CMSIS repo / allow use of CMSIS-DSP

[bmcdonnell-ionx]

Description

• Type: Enhancement
• Priority: Major | Minor (somewhere in this range)

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Enhancement

Reason to enhance or problem with existing solution

There is no straightforward or maintainable way to utilize the parts of CMSIS which are not already included by mbed-os, e.g. CMSIS-DSP.

This is due to the subset of files chosen from the CMSIS repo, which are taken from different revisions of the CMSIS repo, organized in a different folder structure, and further customized within mbed-os. (In my working copy of mbed-os, I did git log --all --graph --decorate cmsis to investigate this. I'm not aware of those customizations being pushed upstream.)

Suggested enhancement

• Most importantly, keep in sync with the CMSIS git repo. If necessary (due to organizational reasons or whatever), fork it, and maintain your own mbed branch.
• Do not rearrange the file/folder structure of CMSIS in the mbed-os tree. Optionally remove some files/folders in the mbed-os CMSIS folder subtree, if necessary.
  • Or maybe even somehow pull all of CMSIS in as a sublibrary. Optionally utilize the pre-built library files provided by CMSIS. (This may be a separate later improvement.)

Pros

• Easy to promptly integrate bugfixes and enhancements from upstream CMSIS.
• Easy to use excluded parts of CMSIS; or the whole thing will be available.

Cons

• Effort / up-front work to implement this change.

[bmcdonnell-ionx]

For the record, I noticed that CMSIS-DSP appears to be located under mbed-os/features/unsupported/dsp. How can I include this in my build?
[Mirrored to Jira]

[0xc0170]

@ARMmbed/mbed-os-core Please review
[Mirrored to Jira]