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when I upload the code to my leonardo board it just stuck on uploading, like this:enter image description here

could someone help me with this?

  • Is it a real Leonardo or a clone? If a clone, adding a reference would be welcome. Also, is it really connected to COM4? – jfpoilpret Mar 28 '15 at 7:12
  • I am sure it is connected to COM4. Actually, I use SparkFun RedBoard instead of Leonardo, but I also try to use Arduino Uno, it has the same problem. – weiyu lu Mar 28 '15 at 18:25
  • First off, the sparkfun redboard must be defined as a UNO in Arduino IDE, not Leonardo. Second; it uses FTDI drivers: did you install these? – jfpoilpret Mar 28 '15 at 20:55

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