#define EN_PIN 6
#define DIR_X 4
#define STEP_X 5

int step_rev = 6400; // 360/1.8 = 200
int dir = 1;
int i = 0;
bool STATE = LOW;
bool STATE_DIR = HIGH;

unsigned long previousMillis_1;  // Store current timer
const unsigned long interval_1 = 1; // Create timer1 1ms

void setup() {
    pinMode(EN_PIN, OUTPUT);
    pinMode(DIR_X, OUTPUT);
    pinMode(STEP_X, OUTPUT);
    Serial.begin(115200);
}

void loop() {
    unsigned long currentMillis = millis();
    digitalWrite(EN_PIN, LOW);
    if (dir > 0) {
        if (currentMillis - previousMillis_1 >= interval_1) {
            digitalWrite(DIR_X, STATE_DIR);
            previousMillis_1 = currentMillis;
            if (STATE) {
                STATE = LOW;
            } else {
                STATE = HIGH;
            }
            digitalWrite(STEP_X, STATE);
            if (i == step_rev) {
                i = 0;
                if (STATE_DIR) {
                    STATE_DIR = LOW;
                } else {
                    STATE_DIR = HIGH;
                }
            }
            i++;
            Serial.println(i);
        }
    }
}