tweak

src/main.cpp

@@ -25,15 +25,18 @@ TMC2209Stepper driver(SW_RX, SW_TX, R_SENSE, DRIVER_ADDRESS);
 #define STEPS_PER_REV 200 * MICROSTEPS
 
 void setup() {
+  Serial.begin(115200);
+  Serial.println("Start...");
+
+  // give power supply time to settle
+  delay(1000);
+
   pinMode(EN_PIN, OUTPUT);
   pinMode(STEP_PIN, OUTPUT);
   pinMode(DIR_PIN, OUTPUT);
   pinMode(DIAG_PIN, INPUT);
   digitalWrite(EN_PIN, LOW);
 
-  Serial.begin(115200);
-  Serial.println("Start...");
-
                                   // Enable one according to your setup
 //SPI.begin();                    // SPI drivers
 //SERIAL_PORT.begin(115200);      // HW UART drivers