printf hard fault

[luke514]

Whenever the compiler executes

printf("frequency %f: %f \n", ((float32_t)(i * SAMPLING_RATE) / FFT_BUFFER_SIZE), output_fft_mag);

it goes to HardFault.

I attach main.c and syscall.c

All the code that we need to analyze is inside the function void get_sineval_FFT2()

Here's the problem:

EDIT: The problem is only there when I try to printf floats ... whereas with normal strings or ints everything goes

[Pavel A.]

This is very strange. Floats passed to printf  must be automatically converted to doubles. Something else goes on there. The float 'coprocessor' not enabled by startup?

[luke514]

Now it works:

After so many trials I don't really remember what I changed from the main.c I had posted in the first post of this thread, maybe I was using temp while I should have used temp[i] ? .. I don't know.

In any case, thank you for your efforts and help.

[raptorhal2]

This is a late-in-the-game longshot. Is your FFT producing double or long double complex results as successive real and imaginary parts in the buffer ?

include <complex.h> support is not in your main.c.

[luke514]

The FFT produces a vector like this: [a0, b0, a1, b1 ...] where a0 is the real part while b0 is the imaginary part of the number