1.Open Manage Run-Time Environment and check the DSP
2.Include arm_math.h
and path in your project:Keil_v5\ARM\PACK\ARM\CMSIS\5.0.1\CMSIS\Include
3.Add symbol ARM_MATH_CM4 since nrf52832 use Cortex M4F
4.Simple matrix multiplication code
Ref:
1. CMSIS DSP Software Library
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