dsp1

#include "tistdtypes.h"
#include "gen_sinus.h"
#include "sine_table.h"
#include "math.h"

#define PI 3.14159265

void gen_sinus(int n, float a, float f, float ph, float buffer[])
{
	int i;
	for (i=0; i<n; i++)
	{
		/* TO DO: Generate sine wave using math.h sin() function */
		buffer[i]=a*sin(2*PI*f*i+ph);
	}
}

#define N SINE_TABLE_SIZE
void gen_sinus_table(int n, float a, float f, float ph, float buffer[])
{
    int i = 0;
    int delta = f * N;
    int k = (ph/(2*PI)*N);
    int mask = (N-1);

    for (i = 0; i < n; i++)
    {
        k = k & mask;
        buffer[i] = a*p_sine_table[k];
        k+=delta;
    }
}


void gen_sinus_multiton(int n, float a, float f0, float df, float ph, float buffer[])
{
	/* TO DO: Generate multitone sine wave */
	int i;
		for (i=0; i<n; i++)
		{
			/* TO DO: Generate sine wave using math.h sin() function */
			float f=0;
			for(f=f0;f<=0.5;){
			buffer[i]=a*sin(2*PI*f*i+ph);
			f+=df;
			}

		}

}

void gen_lin_sweep(int n, float a, float f1, float f2, float ph, float buffer[])
{
    /* TO DO: Generate linear sweep sine wave*/
		int i;
	for(i=0;i<n;i++)
	{
		buffer[i]=f1*i + ((f2-f1)/2*f2)*i*i + ph;
	}

}

void gen_log_sweep(int n, float a, float f1, float f2, float ph, float buffer[])
{
    int i = 0;
    float ph_t = 0;
    for(i = 0; i < n; i++)
    {
    	ph_t = (n*f1/log(f2/f1))*exp((i*log(f2/f1))/n)*2*PI+ph;
    	buffer[i] = a*sin(ph_t);
    }
}

void gen_square(int n, float a, float f, float D, float buffer[])
{
	int i = 0, j=0;
 	int T = 1/f;
 	int Tmax = D*T/100;

	for(i = 0; i < n; i++)
	{
		if(j < Tmax)
		{
			buffer[i] = a;
		}
		else if(j < T)
		{
			buffer[i] = 0;
		}
		else
		{
			j = 0;
			buffer[i] = a;
		}
		j++;
	}
}