10mhz clock output without delaying

Projects Programming
1

Hi,

I want to create a 10 mhz clock output without delaying, and have done this so far:

void loop() {
 
  double t = millis();
  
  // 10mhz cycle. half of the cycle is 5v the other is 0v:
  if(t - tslc > 0.00005 && !cs) 
  {
    if(!cs)
    {
      digitalWrite(XCLK_pin, HIGH);
      cs = true;
    }
    else
    {
      digitalWrite(XCLK_pin, LOW);
      cs = false;
    }
    
    tslc = millis();
  }
  
}
2

accidently posted the thread before i was finished writing..

so my question is, if what I've done so far could provide a steady 10mhz clock or if the arduino uno is too slow for this?

any help or discussion is very much appreciated, thanks

regards
søren

3

Ten milliHertz is one tick every 100 seconds.
I think a 16MHz processor can tackle that.

4 
  double t = millis();

I'm happy to see that you can RTFM.

6

He wants 10 mhz, as in, megahertz.

Not 10 millihertz (whatever did you get that idea? )

Can't be done on 16mhz uno - you can get 16, and you can get 8, but not 10 (though you could get it from an avr clocked at 20mhz.

Also, OP: numbers used by all the library functions take and return integers unless they specifically work with floats (the timekeeping ones certainly don't)

8

You can't get a 10 MHz output with a 16 MHz clock. You could get a 10 MHz clock by running your Arduino at 20 MHz. To do that you should buy a 20 MHz Arduino clone (none of the genuine Arduinos run at 20 MHz). An alternative would be to change the 16 MHz resonator to a 20 MHz one but that requires some tricky surface-mount soldering.