1.8.2.4 mchp_cfft_init_f32()
mchp_status mchp_cfft_init_f32 (mchp_cfft_instance_f32 * S, uint16_t fftLen)
Initialize a single-precision floating-point complex FFT instance.
This function selects the appropriate twiddle-factor table and initializes the FFT instance based on fftLen.
| out | S |
Pointer to instance structure. |
| in | fftLen |
FFT length (e.g., 128, 256, 2048). |
Note:
Twiddle table availability is controlled entirely by build-time macros such as: USE_FFT_LEN_1024
Example:
mchp_cfft_instance_f32 S1, S2; mchp_cfft_init_f32(&S1, 128); mchp_cfft_init_f32(&S2, 256);