title: AVR Dragon & Arduino (mega1280) Cannot enter programming mode
body: <p>I recently purchased an Arduino with an atmega1280 on it. I did not get it to use the Arduino IDE but just as a handy board to use with AVR Studio and my Dragon.</p>
  
  <p>I purchased a new computer around the same time and it is running windows 7 64bit, I downloaded AVR Studio 5.1 and plugged in my Dragon. I upgraded to the latest firmware as it forces you to do. I then connected the Dragon to the Arduino and I get the following error:</p>
  
  <p><code>[ERROR] Failed to enter programming mode. ispEnterProgMode: Error status received: Got 0xc0, expected 0x00, ModuleName: TCF (TCF command: Device:startSession failed.)</code></p>
  
  <p>I have verified the ribbon cable pinouts are the same on both ends and have continuity. Pin 1 goes to Pin 1 and so forth. AVR Studio can read the 5.0V on the sense line but that is it.</p>
  
  <p>I then installed libusb-win (1.6.2.0) and used avrdude to get a more descriptive error:
  <a href="http://pastebin.com/Q0aPzMja" rel="nofollow">pasebin output</a></p>
  
  <p>I have tried to wire up an atmega8 and atmega128 on breadboard with ISP and JTAG connections and I get the same errors as above but it makes more since so troubleshoot the PCB to PCB connection issue to eliminate any mis-wireings I may have.</p>
  
  <p>Any idea where to start looking for the problem???</p>