Originally Posted by jabram
...The only thing stopping Arduino upload using J2 FTDI socket Hk Mega board is that there is NOT a 100nF capacitor from the J2 socket DTR to the RESET pin on ATMega2560 [Pin 30]....
...Arduino uses a pulse on DTR to pulse the 2560 RESET via the capacitor, that resets the 2560 and Arduino starts upload before the 2560 times out and boots the application firmware...
...Terminal on APM, click on Terminal button, as soon as white text appears press ENTER key 3 times, it does work from J2, I have tried it, it works....
+3 for the MPNG bible.
Very good info, and thanks for sharing.
Would have taken me a week to even start googling for it.
I didn't even have DTR connected, but I'll try that, with 100nF, next time.