Hi Trek19,

the fuse settings are not in include files, but in the board definition file. I had a look at the link provided.

NOTE: your link was separated on two lines, so the 020.zip is missing when one click on the link.

Go to Tiny\AVR in the zip file, you will find Prospective Boards.txt. Here is part of the file:

# Frequency 8.0- MHz; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms; [CKSEL=1111 SUT=11]
# Brown-out detection level at VCC=4.3 V; [BODLEVEL=100]
# Preserve EEPROM memory through the Chip Erase cycle; [EESAVE=0]
# Serial program downloading (SPI) enabled; [SPIEN=0]

attiny84at16.bootloader.low_fuses=0xFF
attiny84at16.bootloader.high_fuses=0xD4
attiny84at16.bootloader.extended_fuses=0xFF 

The last three lines are for the three fuses, the 1st one being LFUSE. At this location http://www.engbedded.com/fusecalc you will find a fuse calculator, quite useful  .

Quote:

If you look at the full documentation for the Microcontroller on the board, you will get all the information about fuses and each of the bits. You will also get it from the fuse calculator. Hum, I think you already know  .

Regarding Arduino, the fuses are programmed when the bootloader is uploaded to the board.

Sometimes, not all bits of a byte are used - the most significant bits are the one not used. When it's the case, these bits may be set to 1 or 0 with no difference. What I have seen is that the board definition file sets these unused bit to 0, but when avrdude reads back them for verification - during bootloader upload, these bits return 1. And then you get a verify error  ... that is false.

If you have a hardware programmer, then you can update fuses settings with  "Tools-Device Programming". I can't tell if fuses can be changed in code.

Beware though: changing fuse settings can brick an MCU. The only way to bring it back to life is to use a High Voltage programmer, and as far as I understand, the MCU can't be on a board.

Hi,

Sounds like you are using Atmel Studio and not Visual Studio. It's confusing but the "show all sketch files" currently only works in Visual Studio because atmel does not support virtual folders. We are looking at a workaround

The object browser is also a VS tool, for Atmel Studio you should look at the VisualAssistX menu because it drives all intellisense and code navigation.

If you are using a tiny with an arduino 1.0.x install then some fuse settings are hard coded. This is an area that is expanded within arduino 1.5.x

Either way the fuse settings are not considered part of the source codes so you will not find them this way.

Take a look at programmers.txt that is found with the boards.txt. The programers.txt is used to program the boards when not using USB 

If we can improve on the 1.0.x programmer upload we will but I am not sure if the atmel device tools will work correctly. If they do then you can program using them.

Ok well with arduino 1.5 the fuses are set via the .txt config files (boards, platform and programmers)

There are no hard coded fuses so you have full access to manage the settings