cmsis CMSIS Libraries

apps/mlearning/cmsis fetches CMSIS 5 and builds CMSIS-DSP and CMSIS-NN from that tree. Default version is 5.8.0 (CONFIG_CMSIS_VER). ARM archived the CMSIS 5 repository on 18 December 2025; NuttX still vendors this tree because NNABLA uses the CHW helpers in cmsis-nn-support_nnabla.patch. There is no CMake build for this package.

This package is aimed at NNABLA and generic DSP use. For TensorFlow Lite Micro kernel acceleration, use cmsis-nn CMSIS-NN Library instead. CONFIG_CMSIS_NN here is not CONFIG_MLEARNING_CMSIS_NN.

Enable CONFIG_CMSIS from Application Configuration ‣ Machine Learning Support ‣ CMSIS Libraries.

CONFIG_CMSIS_DSP

CMSIS-DSP. Optional CONFIG_CMSIS_DSP_ARM_MATH_MATRIX_CHECK and CONFIG_CMSIS_DSP_ARM_MATH_ROUNDING map to ARM_MATH_MATRIX_CHECK and ARM_MATH_ROUNDING. CONFIG_ARCH_FPU defines __FPU_PRESENT.

CONFIG_CMSIS_NN

CMSIS-NN from the CMSIS 5 tree. Depends on CONFIG_CMSIS_DSP. A NuttX patch (cmsis-nn-support_nnabla.patch) adds CHW convolution helpers used by NNABLA.

Public headers are added from:

  • CMSIS_5/CMSIS/Core/Include

  • CMSIS_5/CMSIS/DSP/Include (when DSP is enabled)

  • CMSIS_5/CMSIS/NN/Include (when NN is enabled)

See https://arm-software.github.io/CMSIS_5/General/html/index.html.