Hi,
So I was looking at purchasing an AVR32DA28 to experiment with and possibly use in future projects but was a little confused after looking at the following article:
and the github links. So I understand that the new AVR Dx micros use the UPDI interface for programming and that one just needs to stick a Schottky diode and possibly a resistor between the TX and RX lines and then tap off the RX line to get the UPDI signal. I currently have an AXE027 download cable meant for PICAXE micocontrollers. Would this be easy to adapt into a UPDI programmer or should I pickup something else? I thought the 3.5mm jack would be handy as I could just add a panel mount one to project enclosures for easy reprogramming later.
Okay. So I did find a schematic of the cable which indicates that there are 100 Ohm resistors in series with the tx and rx lines. Based on that information I figured the best circuit to build would be to connect a schottky diode from rx to tx and then a 470 Ohm resistor in series to the micro to get the updi signal