So I built my own pcb which includes an atmel micro with arduino bootloader. The micro is running on 5v (it is a 5v model), but I have a 232r -3v3 uart. I have attempted to upload code using the arduino developer environment, but with no success. Error code:
"avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
So, data is not getting read by the arduino or received by the pc. Given that its 5v, the threshold should be around 2.5v, so the micro should be able to read the data, but I am concerned about 5v being sent from the micro to the uart (perhaps this is where the issue lies). Does anybody have any ideas?