NUCLEO F411RE, CubeIDE
As a learning exercise I'm trying to generate 100Hz cosine wave & then eventually do a DFT on it but I'm getting some odd results from the cos function using code below...
#include "arm_math.h"
#define NUM_SAMP 100
#define SIGNAL_FREQ 100.0
#define SAMPLING_FREQ 1000
static void fpu_enable(void);
typedef struct
{
float real;
float imag;
}complex_number;
complex_number samples[NUM_SAMP];
main()
{
fpu_enable();
/* Generate a test signal 100Hz */
for(int n = 0; n < NUM_SAMP; n++ )
{
samples[n].real = cos(2 * PI* SIGNAL_FREQ * n / SAMPLING_FREQ);
samples[n].imag = 0.0;
}
}
static void fpu_enable(void)
{
SCB->CPACR |= ((3UL << 10 * 2) | (3UL << 11 * 2));
}
When I check the values in samples in the debugger....
I was expecting a value of 1 for the first entry and then subsequent values in the interval [-1, 1]
Is this a formatting issue in Cube's debugger or am I missing something obvious here?
