Fuses are set when programming these ATMEGA chips with the Arduino bootloader.
I’ve been having some difficulty with setting these fuses – I cannot set BOOTRST without locking the chip up completely. These are QFN32 packages, so it could be caused by a short. I’m clueless.
From the boards text file, I know that the BOOTRST Vector is usually programmed for 0xDA which means 1024 words, but the pro mini programs that bit at 0xDE, or 256 words.
I am still able to upload hex files to the chip and located the temp build directory for the arduino IDE (C:\Users\John\AppData\Local\Temp).
Build folders pop up in this directory and the hidden hex files are within these individual subfolders. The MultiWII software exports quite a few cpp and header files, but only one hex file. I’m cautiously optimistic that bypassing the bootloader may actually give me something usable. Chips are ordered. We’ll find out on Wednesday or so.