CMSIS Conditions for MATLAB Functions to Support ARM Cortex-M Processors

Each MATLAB^® function that can be used with the Support Package for ARM^® Cortex^®-M processors requires specific conditions to allow code replacement by using the CMSIS Library. You use this code replacement when generating C code from a model or from MATLAB code.

If you do not meet the specific requirements, then the generated C code runs on the ARM Cortex-M processors. However, this generated code does not use CMSIS library support.

The CMSIS library supports these MATLAB functions only when you set specific properties, as indicated in this table:

MATLAB Function	Supported Function Signatures	Input Requirements	Parameter Requirements	Equivalent CMSIS Functions
fft	Y = fft(X) Y = fft(X, n) Y = fft(X, n, dim)	Real or Complex Values Multichannel Input (Multiple columns) single data type	Transform Length n: Real Input: n must be in the range[9 2048] U {4096}-{16}. Complex Input: n must be in the range[5 2048] U {4096}-{8}. Dimension to operate along dim: dim must be a compile time constant.	arm_cfft_f32 arm_rfft_fast_init_f32 arm_rfft_fast_f32 Wrapper functions, each with an mw_prefix, are provided to bridge the library interface.
ifft	X = ifft(Y) X = ifft(Y, n) X = ifft(Y, n, dim) X = ifft(__, symflag)	Real or Complex Values Multichannel Input single data type	Transform Length n: Minimum length is 8. Dimension to operate along dim: dim must be a compile time constant. Symmetric type symflag: non-symmetric (default)	arm_cfft_f32 arm_rfft_fast_init_f32 arm_rfft_fast_f32 Wrapper functions, each with an mw_prefix, are provided to bridge the library interface.
fft2	Y = fft2(X) Y = fft2(X, m, n)	Real or Complex Values Multichannel Input single data type	Number of transform rows m: Minimum length is 8 when input is real. Minimum length is 4 when input is complex. Number of transform rows n: Minimum length is 8 when input is real. Minimum length is 4 when input is complex.	arm_cfft_f32 arm_rfft_fast_init_f32 arm_rfft_fast_f32 Wrapper functions, each with an mw_prefix, are provided to bridge the library interface.
ifft2	X = ifft2(Y) X = ifft2(Y, m, n) X = ifft2(__, symflag)	Complex Values Multichannel Input single data type	Number of transform rows m: Minimum length is 8 Number of transform rows n: Minimum length is 8 Symmetric type symflag: non-symmetric (default)	arm_cfft_f32 arm_rfft_fast_init_f32 arm_rfft_fast_f32 Wrapper functions, each with an mw_prefix, are provided to bridge the library interface.
fftn	Y = fftn(X) Y = fftn(X, sz)	Real or Complex Values Multichannel Input (Multiple columns) single data type	Length of transform dimension sz: Each of sz element should have: Minimum value 8 when input is real Minimum value 4 when input is complex	arm_cfft_f32 arm_rfft_fast_init_f32 arm_rfft_fast_f32 Wrapper functions, each with an mw_prefix, are provided to bridge the library interface.
ifftn	X = ifftn(Y) X = ifftn(Y, sz) X = ifftn(__, symflag)	Complex Values Multichannel Input single data type	Length of transform dimension sz: Each of sz element should have: Minimum value is 8	arm_cfft_f32 arm_rfft_fast_init_f32 arm_rfft_fast_f32 Wrapper functions, each with an mw_prefix, are provided to bridge the library interface.