Getting 10 kHz PWM

can tell me how close 10 khz (can off few hz) on digital pin 9 on nano?  looked @ prescalars , don't allow me close number doing research appears possible through other means.  confused heavy amounts of c++ code though if can post dummy-proof syntax set , unset pin 9 10khz immensely grateful.  last resort, if can't decipher code, i'd able copy/paste code block sketch.  thank you.

here's 1 way, blink without delay style.
adjust duration period want.

code: [select]


byte triggerout = 2; // port d, bit 2 on arduino

unsigned long currentmicros;
unsigned long nextmicros;
unsigned long duration = 25ul; // flip every 50us = 20khz pulse
unsigned long elapsedmicros;

void setup() {
  pinmode (triggerout, output);
nextmicros = micros();
}
void loop() {
  currentmicros = micros();
  elapsedmicros = currentmicros - nextmicros;
  if (elapsedmicros >= duration) {
    nextmicros = nextmicros + duration;
    pind = pind | 0b00000100; // toggle d2 output writing input port.
  }
// other stuff while time goes by
// ...
// end of other stuff, go check time again @ top of loop
}


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