is there a way to reset millis(), without rebooting arduino and without waiting for 8+ hours ??
thanks in advance
newMillis() {
return (millis() - bias);
}
resetMillis() {
bias = millis();
}
this would work only if millis haven’t been reset, cause let say the upper limit for millis is roughly 4,000,000,000
and i call the new reset millis at millis = 3,900,000,000
and then new millis after a while, i get something like:
(millis = 10,000) 10,000 - 3,900,000,000 = newmillis
which is not good.
thanks for the help anyway !
So what is 10,000 - 3,900,000,000?
In human numbering that is -3,899,990,0000
But using a long unsigned integer that is actually 394,977,296. And that is the correct answer for the number of milliseconds between when you reset the timer at 3.9E9 and when the counter read 10,000. The only time this would fall apart is if you do not reset the counter at least once every 50 days.
Edit: Better example: You reset the counter 5 counts before the maximum
Max = 2^32-1 = 4,294,967,295
bias = Max-5 = 4,294,967,290
1 ms later millis() = 4,294,967,291
2 ms later millis() = 4,294,967,292
3 ms later millis() = 4,294,967,293
4 ms later millis() = 4,294,967,294
5 ms later millis() = 4,294,967,295
6 ms later millis() = 0
7 ms later millis() = 1
8 ms later millis() = 2
9 ms later millis() = 3
10 ms later millis() = 4
If you call newMillis at +10ms you would compute 4-bias or 4-4,294,967,290 or (drum roll please…) 10!