How to generate HF signals

Using Arduino Programming Questions
#1

Hi everyone ,I’m new in arduino and I’ve been looking for a way to generate SPWM using both carrier and sine wave. Could you tell me how to generate a high frecuency triangle signal in arduino mega?.
Below you can find my arduino code used to generate triangle, sine and PWM signal.

int hsc=0;
int PWM=0;
int thetax=0;
int mSignalx=0;
int pSignalx=0;
int pState=0;
float theta=0.0;
float ang=0.0;
float mSignal=0.0;
float pSignal=0.0;
float x=64;
void setup() {
}
void loop(){
while(1)
 {
   // funcion diente de sierra        
   if (hsc >= 256) {
     hsc=0;
     ang++;
     if (ang>=32) {ang=0;}
     }
   else hsc++;  
   if (pState==0) {
     pSignal++;
     if (pSignal>=x) { pState=1; } }
   else{
     pSignal--;  
     if (pSignal<=-x) { pState=0; } }
   // Sine Pulse Width Modulation
   theta = (2*3.1416*ang)/32.0; // Angulo para la funcion sinusoidal  
   mSignal=x*sin(theta);
    if (mSignal<pSignal) { PWM=0; }
   else { PWM=1; }
      // convert variables
   thetax=round(theta);
   mSignalx=round(mSignal);
   pSignalx=round(pSignal);  
}
}
#2

What's wrong with that code? Does it not work?

#3

Delta_G:
What's wrong with that code? Does it not work?

Delta_G:
What's wrong with that code? Does it not work?

The code works, I'd like to know how to increase the frecuency of my triangle signal to 6kHz

#4

Why didn't you say so?

How well do you understand how it works? Where did you get it? Did you write it?

#5

It looks like that code is limited by execution speed. What frequency does it produce now?

One way to speed thing up is to pre-calculate tables rather than calling the sin() function. Your calculations break down to:
mSignal = 64.0 * sin((2 * 3.1416 * ang) / 32.0
And 'ang' is in integer from 0 to 31. That looks like a mistake since I would expect you would want sin(n/32) rather than sin(n)/32. After that is corrected the data looks like:

int sineWave[32] = {0,12,24,35,45,53,59,62,
63,62,59,53,45,35,24,12,
-1,-13,-25,-36,-46,-54,-60,-63,
-64,-63,-60,--54,46,-36,-25,-13};

Your code doesn't actually DO anything with the results of all the calculations. It just throws the results away.

#6