I have recently created my own boards, and am SO close to having them work... but I can’t seem to program any of the raw Atmega328P-AU (TQFP-32) chips.
I used Adafruit’s USBTinyISP to burn the Lilypad bootloaders on to the raw chips, but after that, I am not able to upload any sketches to them.
I’m using “1 Inch of Square of Goodness” by the Custom Geek (http://thecustomgeek.com/kits/one-squar ... -build-it/) and I’m able to burn the bootloaders to the chips. And, I’ve then tried connecting the same board to FTDI, and it appears to upload the sketch, but then finishes with the “avrdude not in sync” message that the entirety of the internet doesn’t know how to solve, lol.
I've also tried using a TQFP adapter, to no avail.
I know the FTDI cable is fine, as I can use it without issue to upload sketches to my Arduino Lilypad Simple board.
I've tried uploading via FTDI, and using the "Upload Using Programmer" option, but neither give me any results.
My concern is why I can’t upload any sketches to the ATMEGA328P-AUs I bought from Mouser. I had trouble burning the bootloader at first, but now I’ve at least got that working. I thought that would be the end of the issues, but if I can’t upload the sketch, this entire PCB is useless, lol.
Any suggestions? I need to know soon, as I've got a deadline to meet with these. Thanks to anyone who is able to help. :)