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Hi, I'm using CMSIS DSP Libraries with a microcontroller STM32F4 to compute FFT. Here is my function code to compute the FFT: void fftProcess(float32_t *parSignalInput_f32, float32_t *parfftOutput_f32) { uint16_t i = 0, n = 0;
for (i=0; i<2048; i++) { hamming_signal_real_img_f32[2*i] = 0;//*(parSignalInput_f32+i); hamming_signal_real_img_f32[2*i+1] = 0; }
// // Calculate RFFT on samples // arm_cfft_f32(&arm_cfft_sR_f32_len2048, hamming_signal_real_img_f32, INVERT_FFT, BIT_ORDER_FFT);
// // Calculate complex power of FFT results // arm_cmplx_mag_f32(hamming_signal_real_img_f32, g_fFFTResult_f32, NUM_SAMPLES);
for(i=0; i< (NUM_SAMPLES/2); i++) { *(parfftOutput_f32 + i) = g_fFFTResult_f32[i]; }
} I'm wondering why the next variables: parfftOutput_f32, parSignalInput_f32, g_fFFTResult_f32, hamming_signal_real_img_f32 must be defined as global variables. If there are not, my program goes in the hardfault handler. Thanks for your answer, PH
Thanks for your correction, you are right :) I try to test my function by putting all my variables in local static to understand if the scope or the lifetime was important. I have no error. It seems that the parameter "parfftOutput_f32" of the function must be declared as local but not static. The three other variables must be declared as static.
"It seems that the parameter "parfftOutput_f32" of the function must be declared as local but not static. The three other variables must be declared as static."
Ho? I think there is something else going wrong...