sig_gen.cpp

Go to the documentation of this file.

#include <math.h>

#include "misc/sig_gen.h"

#define PI                      3.14159265358979
#define TWOPI           6.28318530717959

//static float g_freqHz, g_amplitude, g_periodSec, g_time;


//void init_sig_gen( float loopPeriodSec, float freqHz, float amplitude )
//{
        //g_freqHz = freqHz;
        //g_amplitude = amplitude;
        //g_periodSec = loopPeriodSec;
        //g_time = 0;
//}


float step_sinwave( float *sig_gen, float freqHz, float amplitude, float periodSec )
{
        *sig_gen += freqHz * periodSec * TWOPI;
        
        // Unwrap Angle
        if( *sig_gen > PI )     
                *sig_gen -= TWOPI;
        
        return amplitude * sinf( *sig_gen );
}