interrupt advice

Hi people,

i want to use interrupt when my stepper motor is moving full rotation (this take the motor about 3 sec to complete full rotation, so i have a window to use interrupt.
the only problem is that i don’t know how to do interrupt only via the code (i want the code to make interrupt when the full revolutions order is happening.
how do I do that?

include <Stepper.h>

int stepPerRev = 2048;
int motspeed = 10;
int dt =500;

Stepper myStepper (stepPerRev, 2, 3, 4, 5);
void setup() {

void loop() {
// interupt here, when the line above happen simultaneously !!!


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