/*
  ESP32 + A4988 + Stepper (NEMA17) example for Wokwi

  Wiring (matches diagram.json):
  - STEP -> GPIO 18
  - DIR  -> GPIO 19
  - EN   -> GPIO 23 (LOW = enabled)
*/

#define STEP_PIN 18
#define DIR_PIN  19
#define EN_PIN   23

// A4988 microstep pins in diagram are tied LOW (full-step).
// Steps per revolution depends on your motor (commonly 200 for NEMA17).
const int STEPS_PER_REV = 200;

// Speed control (microseconds between step pulses)
int stepDelayUs = 800; // smaller = faster

void stepOnce() {
  digitalWrite(STEP_PIN, HIGH);
  delayMicroseconds(3);         // A4988 needs a short HIGH pulse (>= ~1us)
  digitalWrite(STEP_PIN, LOW);
  delayMicroseconds(stepDelayUs);
}

void stepN(int steps) {
  for (int i = 0; i < steps; i++) stepOnce();
}

void setup() {
  Serial.begin(115200);

  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);
  pinMode(EN_PIN, OUTPUT);

  // Enable driver (A4988 EN is active-low)
  digitalWrite(EN_PIN, LOW);

  Serial.println("Stepper demo: 1 rev CW, pause, 1 rev CCW...");
}

void loop() {
  // Clockwise
  digitalWrite(DIR_PIN, HIGH);
  Serial.println("CW");
  stepN(STEPS_PER_REV);
  delay(500);

  // Counter-clockwise
  digitalWrite(DIR_PIN, LOW);
  Serial.println("CCW");
  stepN(STEPS_PER_REV);
  delay(500);
}