delayMicroseconds(0) = 16383µs

Projects Programming
26

my appologies for the delayMicroseconds(0) in replying.... pun intended.

I'm working on an ignition timing circuit which has a potentiometer on A0 that essentially translates into a delay that is the inverse of the Timing Advance. So, if I want all 20 degrees advance then my pot is set to 0 and that is translated into delayMicroseconds(0).

I'm using this function because I want as much resolution as possible... and adding say 20-40us of programming overhead is still acceptable compared to being limited to a 1ms resolution..

This is how I've been coping with the 0 and 16383 limit:

 if (u_offsetTime == 0){    //when delayMicroseconds(0) = 16383µs.. glitch in library.
    u_offsetTime = 1;}
    
  if (u_offsetTime >= 0x3ffe){ //delayMicroseconds limit is 0x3fff, so we seperate the number into 2 variables.
    u1_offsetTime = (u_offsetTime - 0x3ffe); //made this 1 less than 0x3fff because I want to be EXTRA sure that it doesn't do funny things.
    u_offsetTime = 0x3ffe;
     
    if (u1_offsetTime >= 0x3ffe){
      u2_offsetTime = (u1_offsetTime - 0x3ffe);
      u1_offsetTime = 0x3ffe;}
      else { u2_offsetTime = 1;}        
}
  else {
    u1_offsetTime = 1;
  }

so far it seems to be working fine and I'm able to have (16382 * 3)us of delay if I need it...

I feel like I'm trying to cut a turkey with a fork. It's crewed but it seems to be working.

Thanks for all the replies.