Hello, Whenever I try to upload marlin firmware to my Arduino Mega 2560 it gives me an error and i have checked my tools and i am connected to the Arduino Mega 2560 board and port and have the ATmMega 2560 selected for my processor, and every time I try to upload my Marlin firmware it gives me an error message that says...
Arduino: 1.6.5 (Windows 7), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)" Sketch uses 2,360 bytes (0%) of program storage space. Maximum is 253,952 bytes. Global variables use 55 bytes (0%) of dynamic memory, leaving 8,137 bytes for local variables. Maximum is 8,192 bytes. avrdude: ser_open(): can't open device "\\.\COM3": The system cannot find the file specified. avrdude: ser_drain(): read error: The handle is invalid. Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions. This report would have more information with "Show verbose output during compilation" enabled in File > Preferences.
...I have also tryed the hello world firmware it gave me the same error. :(
Thanks, John :)