I have a custom board..
and I have been assembling them by using some DIY re-flow (solder paste, stencil, toaster oven)..
I have made two 'successful' boards (meaning they will take bootloader and accept sketches)
the 3rd one I am having a bit of trouble with..
looks to have taken the Optiloader bootloader I flashed to it (watched serial monitor from Optiloader sketch)..
I then pop out ATMEGA329 DIP chip in my Arduino Due 2009... and connect my custom board with pass through RX/TX lines... with the RESET line going to my DTR pin on my custom board..
this is how I have done my previous boards set-up..etc.
however.. I can NOT get a sketch to upload..
and I believe I might have a bridge somewhere?.. but not sure where to start looking I guess.
when I short the DTR pad to the GND pad next to it.. I do NOT see/get a reset/blink on my red light??
However if I short RESET pin to GND.. I get a quick blink.. (still not able to load sketches if i manually try to do that upon sketch uploading)..
my other boards seem to work fine.. connected and set-up same way...
what pins could bridge to be stopping my DTR pin form working?
heres a schematic.. but electrically it must be 'sound' as the other board 'work'..
Im just stumped as to where the bridge could be? figured I would start with some suggestions from the more experienced members here.