Mega2560 board upload fails

Development Tools Uploading
8

OK, so the next thing I would suggest is the loopback test. This will check the functionality of the ATmega16U2 chip used as the USB to serial adapter on the board. The fact that you were able to flash the firmware on that chip already shows it is working fairly well, but the loopback test is easy enough to run and will provide additional verification

Here are the loopback test instructions:

  1. Disconnect power from the board.
  2. Remove all connections and shields from the Arduino board.
  3. Connect a jumper wire from the RESET to the GND pin.
    (This is done to hold the primary microcontroller in a reset state so it doesn't interfere with this test of the USB to serial adapter chip on the board)
  4. Connect a jumper from the RX pin (Arduino pin 0) to the TX pin (Arduino pin 1).
  5. Connect the Arduino board to your computer.
  6. Select the port of your board from the Arduino IDE's Tools > Port menu.
  7. Select Tools > Serial Monitor from the Arduino IDE's menus.
  8. Type some text into the input field at the top of the Serial Monitor window.
  9. Press Enter.
    • If the text you typed is shown in Serial Monitor's output window, the loopback test passed :grinning:.
    • If the text was not shown, the loopback test failed :cry:.
  10. Close Serial Monitor.
  11. Disconnect the board from the computer.
  12. Remove the two jumper wires.
1 Like