I tested the arduino function delayMicroseconds() in the following program on Edison arduino board. I want produce a square wave of T=400us and duty=50%.
But I got a square wave of T=600us and duty=50%. I watched the wave on an oscilloscope.
Why? And how can i get a accurate delay of us？
void setup() {
// put your setup code here, to run once:
pinMode(12,OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite(12,LOW);
delayMicroseconds(200);
digitalWrite(12,HIGH);
delayMicroseconds(200);
}