How to get inside the delay() function

Projects Programming
1

Hi! Sorry if this question is around, I could not find it. I am working with timers directly. I would like to know where is the code of delay function. delay() use timer0 and I wonder how it was made? it is an oportunity for me to learning more about timers viewing this complex function. Thanks

2

Where did you install the IDE? Which version are you using? On my 1.0.5 version, delay() is implemented in
C:\Users\PaulS\Documents\Arduino_105\hardware\arduino\cores\arduino\wiring.c

3

There is nothing complex about delay()

4

delay() is here : https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/wiring.c
yield() is here : https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/hooks.c

I didn't know there was a 'yield()'.
This is a test to override the empty yield():

// override yield test
// Blink led and print a dot to serial monitor every second.

void setup() 
{
  Serial.begin(9600);
  Serial.println("Running");
  
  pinMode(13, OUTPUT);
}

void loop() 
{
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
}

// override the empty yield function, executed from within delay().
void yield()
{
  static unsigned long prevMillis;
  if( millis() - prevMillis > 1000)
  {
    Serial.print(".");
    prevMillis += 1000;
  }
}