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math: Introduce a DSP basicmath subsystem with a cmsis backend

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Introduce an API mirroring the CMSIS-DSP's basicmath. If CMSIS_DSP is
enabled, then it will by default be used as a backend. Developers may
opt into a custom backend by setting CONFIG_DSP_BACKEND_CMSIS=n. If
done, the application must provide `zdsp_backend/dsp.h` and optionally
implement the functions in its own .c files.

Signed-off-by: Yuval Peress <peress@google.com>
This commit is contained in:
Yuval Peress 2022-10-06 23:54:46 -06:00 • committed by Carles Cufí
commit b38445eaa0
20 changed files with 1637 additions and 3 deletions
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subsys/CMakeLists.txt
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@ -19,6 +19,7 @@ add_subdirectory(random)
add_subdirectory(storage)
add_subdirectory_ifdef(CONFIG_SETTINGS settings)
add_subdirectory(fb)
add_subdirectory(dsp)
add_subdirectory(portability)
add_subdirectory(pm)
add_subdirectory(stats)